SlideShare une entreprise Scribd logo
1  sur  29
Télécharger pour lire hors ligne
Relaxation in NGC 362
Javiera Parada
May 8th 2019
A Richer Universe
In collaboration with:
I. Caiazzo, J. Heyl, H. Richer (UBC), J. Kalirai, P.Tremblay, M. Correnti, J. Cummings, B. Hansen, L.
Watkins,A. Bellini, J.Anderson
• Introduction
• Proper motion cleaning
• Modelling
• Results
• Conclusions
Introduction
Determine the relaxation time in the core of
the globular cluster NGC 362 by tracking the
positions of the youngest white dwarfs.
• Introduction
• Proper motion cleaning
• Modelling
• Results
• Conclusions
Observations in the UV
HST/WFC3 UV filters F225W and F275W.
• Introduction
• Proper motion cleaning
• Modelling
• Results
• Conclusions
Observations in the UV
White dwarfs
• Introduction
• Proper motion cleaning
• Modelling
• Results
• Conclusions
Colour-magnitude diagram
• Introduction
• Proper motion cleaning
• Modelling
• Results
• Conclusions
Colour-magnitude diagram
White dwarfs
are bright in
the UV
• Introduction
• Proper motion cleaning
• Modelling
• Results
• Conclusions
Colour-magnitude diagram
White dwarfs
Small Magellanic
Cloud stars
• Introduction
• Proper motion cleaning
• Modelling
• Results
• Conclusions
Colour-magnitude diagram
White dwarfs
Small Magellanic
Cloud stars
Other stars we
don’t like
• Introduction
• Proper motion cleaning
• Modelling
• Results
• Conclusions
Proper Motion Cleaning
• Introduction
• Proper motion cleaning
• Modelling
• Results
• Conclusions
Proper Motion Cleaning
• Introduction
• Proper motion cleaning
• Modelling
• Results
• Conclusions
Completeness corrections – SMC background stars
• Introduction
• Proper motion cleaning
• Modelling
• Results
• Conclusions
Colour-magnitude diagram
• Introduction
• Proper motion cleaning
• Modelling
• Results
• Conclusions
Selecting stars
• Select stars based
on their position
in the CMD.
• Clear white dwarf
sequence.
• Introduction
• Proper motion cleaning
• Modelling
• Results
• Conclusions
Tracking positions - Distributions of stars
• Introduction
• Proper motion cleaning
• Modelling
• Results
• Conclusions
Tracking positions - Distributions of stars
• Young white dwarfs
have recently lost close
to half their mass and
are just beginning to
migrate outwards due
to relaxation.
• Older white dwarfs are
already further out.
• Introduction
• Proper motion cleaning
• Modelling
• Results
• Conclusions
The relaxation time
• As defined in Heyl et at. 2015 (ApJ, 804:43)
𝑡"#$%& =	
𝑎*
+
𝜅
• Introduction
• Proper motion cleaning
• Modelling
• Results
• Conclusions
Time dependent core radius
• As defined in Heyl et at. 2015 (ApJ, 804:43)
• Time dependent core radius
𝑡"#$%& =	
𝑎*
+
𝜅
• Introduction
• Proper motion cleaning
• Modelling
• Results
• Conclusions
Modelling the distributions
• As defined in Heyl et at. 2015 (ApJ, 804:43)
• Time dependent core radius
• King model
𝑡"#$%& =	
𝑎*
+
𝜅
• Introduction
• Proper motion cleaning
• Modelling
• Results
• Conclusions
Modelling the distributions
• As defined in Heyl et at. 2015 (ApJ, 804:43)
• Time dependent core radius
• King model
𝑡"#$%& =	
𝑎*
+
𝜅
• Introduction
• Proper motion cleaning
• Modelling
• Results
• Conclusions
Modelling the distributions
• Introduction
• Proper motion cleaning
• Modelling
• Results
• Conclusions
Modelling the distributions
• Introduction
• Proper motion cleaning
• Modelling
• Results
• Conclusions
Estimating 	𝑎* and 	𝜅
Binning
Unbinned
likelihood	
estimation
White	dwarfs	
ages
Dividing	WDs	
into	faint	and	
bright	WDs
• Introduction
• Proper motion cleaning
• Modelling
• Results
• Conclusions
White dwarfs ages
White	dwarfs	
ages
WD	birth	rate
(Counting	stars)
WD	cooling	
models
𝑡- =	
1
𝑁̇
	1
1
𝐶3
35-
Ages	from	
F225W	
magnitude
• Introduction
• Proper motion cleaning
• Modelling
• Results
• Conclusions
Isochrone & cooling models
• 11 Gyr isochrone
built using MESA
models.
• Initial mass of main
sequence stars
currently becoming
WDs is 0.81 M⦿
• Cooling curve for
the 0.54 M⦿ white
dwarf generated
from a 0.81 M⦿ main-
sequence star.
Javiera Parada: Relaxing in NGC 362*
Javiera Parada: Relaxing in NGC 362*
Javiera Parada: Relaxing in NGC 362*
Javiera Parada: Relaxing in NGC 362*
Javiera Parada: Relaxing in NGC 362*

Contenu connexe

Plus de JeremyHeyl

David Zurek: Globular Clusters in the Far UV*
David Zurek: Globular Clusters in the Far UV*David Zurek: Globular Clusters in the Far UV*
David Zurek: Globular Clusters in the Far UV*JeremyHeyl
 
Douglas Scott: Astronomy and Coins
Douglas Scott: Astronomy and CoinsDouglas Scott: Astronomy and Coins
Douglas Scott: Astronomy and CoinsJeremyHeyl
 
Jason Kalirai: Redefining the Initial-Final Mass Relation*
Jason Kalirai: Redefining the Initial-Final Mass Relation*Jason Kalirai: Redefining the Initial-Final Mass Relation*
Jason Kalirai: Redefining the Initial-Final Mass Relation*JeremyHeyl
 
Andrea Bellini: Internal kinematics of globular clusters: state of the art, i...
Andrea Bellini: Internal kinematics of globular clusters: state of the art, i...Andrea Bellini: Internal kinematics of globular clusters: state of the art, i...
Andrea Bellini: Internal kinematics of globular clusters: state of the art, i...JeremyHeyl
 
Gwendolyn Eadie: A New Method for Time Series Analysis in Astronomy with an A...
Gwendolyn Eadie: A New Method for Time Series Analysis in Astronomy with an A...Gwendolyn Eadie: A New Method for Time Series Analysis in Astronomy with an A...
Gwendolyn Eadie: A New Method for Time Series Analysis in Astronomy with an A...JeremyHeyl
 
Greg Fahlman: Working in the Richer Universe at UBC*
Greg Fahlman: Working in the Richer Universe at UBC*Greg Fahlman: Working in the Richer Universe at UBC*
Greg Fahlman: Working in the Richer Universe at UBC*JeremyHeyl
 
George Wallerstein: To What Population Do the Type II Cepheids Belong?*
George Wallerstein: To What Population Do the Type II Cepheids Belong?*George Wallerstein: To What Population Do the Type II Cepheids Belong?*
George Wallerstein: To What Population Do the Type II Cepheids Belong?*JeremyHeyl
 
Pauline Barmby: Extragalactic Star Clusters and Stellar Populations*
Pauline Barmby: Extragalactic Star Clusters and Stellar Populations*Pauline Barmby: Extragalactic Star Clusters and Stellar Populations*
Pauline Barmby: Extragalactic Star Clusters and Stellar Populations*JeremyHeyl
 
Seery Chen: Distances to 47 Tuc and NGC 362 with Gaia parallaxes*
Seery Chen: Distances to 47 Tuc and NGC 362 with Gaia parallaxes*Seery Chen: Distances to 47 Tuc and NGC 362 with Gaia parallaxes*
Seery Chen: Distances to 47 Tuc and NGC 362 with Gaia parallaxes*JeremyHeyl
 
R. Michael Rich: New Results on the Galactic Bulge and Nuclear Star Cluster*
R. Michael Rich: New Results on the Galactic Bulge and Nuclear Star Cluster*R. Michael Rich: New Results on the Galactic Bulge and Nuclear Star Cluster*
R. Michael Rich: New Results on the Galactic Bulge and Nuclear Star Cluster*JeremyHeyl
 
Francesco R. Ferraro: An Empirical Clock to Measure the Dynamical Age of Star...
Francesco R. Ferraro: An Empirical Clock to Measure the Dynamical Age of Star...Francesco R. Ferraro: An Empirical Clock to Measure the Dynamical Age of Star...
Francesco R. Ferraro: An Empirical Clock to Measure the Dynamical Age of Star...JeremyHeyl
 
Gordon Walker: Some Time with Harvey*
Gordon Walker: Some Time with Harvey*Gordon Walker: Some Time with Harvey*
Gordon Walker: Some Time with Harvey*JeremyHeyl
 
Pier-Emmanuel Tremblay: White Dwarfs in Gaia DR2*
Pier-Emmanuel Tremblay: White Dwarfs in Gaia DR2*Pier-Emmanuel Tremblay: White Dwarfs in Gaia DR2*
Pier-Emmanuel Tremblay: White Dwarfs in Gaia DR2*JeremyHeyl
 
Paolo Ventura: The Formation of Multiple Populations in Globular Clusters by ...
Paolo Ventura: The Formation of Multiple Populations in Globular Clusters by ...Paolo Ventura: The Formation of Multiple Populations in Globular Clusters by ...
Paolo Ventura: The Formation of Multiple Populations in Globular Clusters by ...JeremyHeyl
 
Alysa Obertas: Freezing or not? The white dwarfs in 47 Tuc
Alysa Obertas: Freezing or not?  The white dwarfs in 47 TucAlysa Obertas: Freezing or not?  The white dwarfs in 47 Tuc
Alysa Obertas: Freezing or not? The white dwarfs in 47 TucJeremyHeyl
 
Jeremy Heyl: Cluster Dynamics, Richer and Poorer
Jeremy Heyl: Cluster Dynamics, Richer and PoorerJeremy Heyl: Cluster Dynamics, Richer and Poorer
Jeremy Heyl: Cluster Dynamics, Richer and PoorerJeremyHeyl
 

Plus de JeremyHeyl (16)

David Zurek: Globular Clusters in the Far UV*
David Zurek: Globular Clusters in the Far UV*David Zurek: Globular Clusters in the Far UV*
David Zurek: Globular Clusters in the Far UV*
 
Douglas Scott: Astronomy and Coins
Douglas Scott: Astronomy and CoinsDouglas Scott: Astronomy and Coins
Douglas Scott: Astronomy and Coins
 
Jason Kalirai: Redefining the Initial-Final Mass Relation*
Jason Kalirai: Redefining the Initial-Final Mass Relation*Jason Kalirai: Redefining the Initial-Final Mass Relation*
Jason Kalirai: Redefining the Initial-Final Mass Relation*
 
Andrea Bellini: Internal kinematics of globular clusters: state of the art, i...
Andrea Bellini: Internal kinematics of globular clusters: state of the art, i...Andrea Bellini: Internal kinematics of globular clusters: state of the art, i...
Andrea Bellini: Internal kinematics of globular clusters: state of the art, i...
 
Gwendolyn Eadie: A New Method for Time Series Analysis in Astronomy with an A...
Gwendolyn Eadie: A New Method for Time Series Analysis in Astronomy with an A...Gwendolyn Eadie: A New Method for Time Series Analysis in Astronomy with an A...
Gwendolyn Eadie: A New Method for Time Series Analysis in Astronomy with an A...
 
Greg Fahlman: Working in the Richer Universe at UBC*
Greg Fahlman: Working in the Richer Universe at UBC*Greg Fahlman: Working in the Richer Universe at UBC*
Greg Fahlman: Working in the Richer Universe at UBC*
 
George Wallerstein: To What Population Do the Type II Cepheids Belong?*
George Wallerstein: To What Population Do the Type II Cepheids Belong?*George Wallerstein: To What Population Do the Type II Cepheids Belong?*
George Wallerstein: To What Population Do the Type II Cepheids Belong?*
 
Pauline Barmby: Extragalactic Star Clusters and Stellar Populations*
Pauline Barmby: Extragalactic Star Clusters and Stellar Populations*Pauline Barmby: Extragalactic Star Clusters and Stellar Populations*
Pauline Barmby: Extragalactic Star Clusters and Stellar Populations*
 
Seery Chen: Distances to 47 Tuc and NGC 362 with Gaia parallaxes*
Seery Chen: Distances to 47 Tuc and NGC 362 with Gaia parallaxes*Seery Chen: Distances to 47 Tuc and NGC 362 with Gaia parallaxes*
Seery Chen: Distances to 47 Tuc and NGC 362 with Gaia parallaxes*
 
R. Michael Rich: New Results on the Galactic Bulge and Nuclear Star Cluster*
R. Michael Rich: New Results on the Galactic Bulge and Nuclear Star Cluster*R. Michael Rich: New Results on the Galactic Bulge and Nuclear Star Cluster*
R. Michael Rich: New Results on the Galactic Bulge and Nuclear Star Cluster*
 
Francesco R. Ferraro: An Empirical Clock to Measure the Dynamical Age of Star...
Francesco R. Ferraro: An Empirical Clock to Measure the Dynamical Age of Star...Francesco R. Ferraro: An Empirical Clock to Measure the Dynamical Age of Star...
Francesco R. Ferraro: An Empirical Clock to Measure the Dynamical Age of Star...
 
Gordon Walker: Some Time with Harvey*
Gordon Walker: Some Time with Harvey*Gordon Walker: Some Time with Harvey*
Gordon Walker: Some Time with Harvey*
 
Pier-Emmanuel Tremblay: White Dwarfs in Gaia DR2*
Pier-Emmanuel Tremblay: White Dwarfs in Gaia DR2*Pier-Emmanuel Tremblay: White Dwarfs in Gaia DR2*
Pier-Emmanuel Tremblay: White Dwarfs in Gaia DR2*
 
Paolo Ventura: The Formation of Multiple Populations in Globular Clusters by ...
Paolo Ventura: The Formation of Multiple Populations in Globular Clusters by ...Paolo Ventura: The Formation of Multiple Populations in Globular Clusters by ...
Paolo Ventura: The Formation of Multiple Populations in Globular Clusters by ...
 
Alysa Obertas: Freezing or not? The white dwarfs in 47 Tuc
Alysa Obertas: Freezing or not?  The white dwarfs in 47 TucAlysa Obertas: Freezing or not?  The white dwarfs in 47 Tuc
Alysa Obertas: Freezing or not? The white dwarfs in 47 Tuc
 
Jeremy Heyl: Cluster Dynamics, Richer and Poorer
Jeremy Heyl: Cluster Dynamics, Richer and PoorerJeremy Heyl: Cluster Dynamics, Richer and Poorer
Jeremy Heyl: Cluster Dynamics, Richer and Poorer
 

Dernier

THE HISTOLOGY OF THE CARDIOVASCULAR SYSTEM 2024.pptx
THE HISTOLOGY OF THE CARDIOVASCULAR SYSTEM 2024.pptxTHE HISTOLOGY OF THE CARDIOVASCULAR SYSTEM 2024.pptx
THE HISTOLOGY OF THE CARDIOVASCULAR SYSTEM 2024.pptxAkinrotimiOluwadunsi
 
Contracts with Interdependent Preferences (2)
Contracts with Interdependent Preferences (2)Contracts with Interdependent Preferences (2)
Contracts with Interdependent Preferences (2)GRAPE
 
Krishi Vigyan Kendras - कृषि विज्ञान केंद्र
Krishi Vigyan Kendras - कृषि विज्ञान केंद्रKrishi Vigyan Kendras - कृषि विज्ञान केंद्र
Krishi Vigyan Kendras - कृषि विज्ञान केंद्रKrashi Coaching
 
Exploration Method’s in Archaeological Studies & Research
Exploration Method’s in Archaeological Studies & ResearchExploration Method’s in Archaeological Studies & Research
Exploration Method’s in Archaeological Studies & ResearchPrachya Adhyayan
 
001 Case Study - Submission Point_c1051231_attempt_2023-11-23-14-08-42_ABS CW...
001 Case Study - Submission Point_c1051231_attempt_2023-11-23-14-08-42_ABS CW...001 Case Study - Submission Point_c1051231_attempt_2023-11-23-14-08-42_ABS CW...
001 Case Study - Submission Point_c1051231_attempt_2023-11-23-14-08-42_ABS CW...marwaahmad357
 
Pests of wheat_Identification, Bionomics, Damage symptoms, IPM_Dr.UPR.pdf
Pests of wheat_Identification, Bionomics, Damage symptoms, IPM_Dr.UPR.pdfPests of wheat_Identification, Bionomics, Damage symptoms, IPM_Dr.UPR.pdf
Pests of wheat_Identification, Bionomics, Damage symptoms, IPM_Dr.UPR.pdfPirithiRaju
 
Pests of ragi_Identification, Binomics_Dr.UPR
Pests of ragi_Identification, Binomics_Dr.UPRPests of ragi_Identification, Binomics_Dr.UPR
Pests of ragi_Identification, Binomics_Dr.UPRPirithiRaju
 
Substances in Common Use for Shahu College Screening Test
Substances in Common Use for Shahu College Screening TestSubstances in Common Use for Shahu College Screening Test
Substances in Common Use for Shahu College Screening TestAkashDTejwani
 
Gene transfer in plants agrobacterium.pdf
Gene transfer in plants agrobacterium.pdfGene transfer in plants agrobacterium.pdf
Gene transfer in plants agrobacterium.pdfNetHelix
 
Bureau of Indian Standards Specification of Shampoo.pptx
Bureau of Indian Standards Specification of Shampoo.pptxBureau of Indian Standards Specification of Shampoo.pptx
Bureau of Indian Standards Specification of Shampoo.pptxkastureyashashree
 
Digitized Continuous Magnetic Recordings for the August/September 1859 Storms...
Digitized Continuous Magnetic Recordings for the August/September 1859 Storms...Digitized Continuous Magnetic Recordings for the August/September 1859 Storms...
Digitized Continuous Magnetic Recordings for the August/September 1859 Storms...Sérgio Sacani
 
Q3W4part1-SSSSSSSSSSSSSSSSSSSSSSSSCI.pptx
Q3W4part1-SSSSSSSSSSSSSSSSSSSSSSSSCI.pptxQ3W4part1-SSSSSSSSSSSSSSSSSSSSSSSSCI.pptx
Q3W4part1-SSSSSSSSSSSSSSSSSSSSSSSSCI.pptxArdeniel
 
Alternative system of medicine herbal drug technology syllabus
Alternative system of medicine herbal drug technology syllabusAlternative system of medicine herbal drug technology syllabus
Alternative system of medicine herbal drug technology syllabusPradnya Wadekar
 
geometric quantization on coadjoint orbits
geometric quantization on coadjoint orbitsgeometric quantization on coadjoint orbits
geometric quantization on coadjoint orbitsHassan Jolany
 
RCPE terms and cycles scenarios as of March 2024
RCPE terms and cycles scenarios as of March 2024RCPE terms and cycles scenarios as of March 2024
RCPE terms and cycles scenarios as of March 2024suelcarter1
 
Role of herbs in hair care Amla and heena.pptx
Role of herbs in hair care  Amla and  heena.pptxRole of herbs in hair care  Amla and  heena.pptx
Role of herbs in hair care Amla and heena.pptxVaishnaviAware
 
World Water Day 22 March 2024 - kiyorndlab
World Water Day 22 March 2024 - kiyorndlabWorld Water Day 22 March 2024 - kiyorndlab
World Water Day 22 March 2024 - kiyorndlabkiyorndlab
 
Pests of tenai_Identification,Binomics_Dr.UPR
Pests of tenai_Identification,Binomics_Dr.UPRPests of tenai_Identification,Binomics_Dr.UPR
Pests of tenai_Identification,Binomics_Dr.UPRPirithiRaju
 
CW marking grid Analytical BS - M Ahmad.docx
CW  marking grid Analytical BS - M Ahmad.docxCW  marking grid Analytical BS - M Ahmad.docx
CW marking grid Analytical BS - M Ahmad.docxmarwaahmad357
 

Dernier (20)

THE HISTOLOGY OF THE CARDIOVASCULAR SYSTEM 2024.pptx
THE HISTOLOGY OF THE CARDIOVASCULAR SYSTEM 2024.pptxTHE HISTOLOGY OF THE CARDIOVASCULAR SYSTEM 2024.pptx
THE HISTOLOGY OF THE CARDIOVASCULAR SYSTEM 2024.pptx
 
Contracts with Interdependent Preferences (2)
Contracts with Interdependent Preferences (2)Contracts with Interdependent Preferences (2)
Contracts with Interdependent Preferences (2)
 
Krishi Vigyan Kendras - कृषि विज्ञान केंद्र
Krishi Vigyan Kendras - कृषि विज्ञान केंद्रKrishi Vigyan Kendras - कृषि विज्ञान केंद्र
Krishi Vigyan Kendras - कृषि विज्ञान केंद्र
 
Exploration Method’s in Archaeological Studies & Research
Exploration Method’s in Archaeological Studies & ResearchExploration Method’s in Archaeological Studies & Research
Exploration Method’s in Archaeological Studies & Research
 
001 Case Study - Submission Point_c1051231_attempt_2023-11-23-14-08-42_ABS CW...
001 Case Study - Submission Point_c1051231_attempt_2023-11-23-14-08-42_ABS CW...001 Case Study - Submission Point_c1051231_attempt_2023-11-23-14-08-42_ABS CW...
001 Case Study - Submission Point_c1051231_attempt_2023-11-23-14-08-42_ABS CW...
 
Pests of wheat_Identification, Bionomics, Damage symptoms, IPM_Dr.UPR.pdf
Pests of wheat_Identification, Bionomics, Damage symptoms, IPM_Dr.UPR.pdfPests of wheat_Identification, Bionomics, Damage symptoms, IPM_Dr.UPR.pdf
Pests of wheat_Identification, Bionomics, Damage symptoms, IPM_Dr.UPR.pdf
 
Pests of ragi_Identification, Binomics_Dr.UPR
Pests of ragi_Identification, Binomics_Dr.UPRPests of ragi_Identification, Binomics_Dr.UPR
Pests of ragi_Identification, Binomics_Dr.UPR
 
Substances in Common Use for Shahu College Screening Test
Substances in Common Use for Shahu College Screening TestSubstances in Common Use for Shahu College Screening Test
Substances in Common Use for Shahu College Screening Test
 
Gene transfer in plants agrobacterium.pdf
Gene transfer in plants agrobacterium.pdfGene transfer in plants agrobacterium.pdf
Gene transfer in plants agrobacterium.pdf
 
Bureau of Indian Standards Specification of Shampoo.pptx
Bureau of Indian Standards Specification of Shampoo.pptxBureau of Indian Standards Specification of Shampoo.pptx
Bureau of Indian Standards Specification of Shampoo.pptx
 
Applying Cheminformatics to Develop a Structure Searchable Database of Analyt...
Applying Cheminformatics to Develop a Structure Searchable Database of Analyt...Applying Cheminformatics to Develop a Structure Searchable Database of Analyt...
Applying Cheminformatics to Develop a Structure Searchable Database of Analyt...
 
Digitized Continuous Magnetic Recordings for the August/September 1859 Storms...
Digitized Continuous Magnetic Recordings for the August/September 1859 Storms...Digitized Continuous Magnetic Recordings for the August/September 1859 Storms...
Digitized Continuous Magnetic Recordings for the August/September 1859 Storms...
 
Q3W4part1-SSSSSSSSSSSSSSSSSSSSSSSSCI.pptx
Q3W4part1-SSSSSSSSSSSSSSSSSSSSSSSSCI.pptxQ3W4part1-SSSSSSSSSSSSSSSSSSSSSSSSCI.pptx
Q3W4part1-SSSSSSSSSSSSSSSSSSSSSSSSCI.pptx
 
Alternative system of medicine herbal drug technology syllabus
Alternative system of medicine herbal drug technology syllabusAlternative system of medicine herbal drug technology syllabus
Alternative system of medicine herbal drug technology syllabus
 
geometric quantization on coadjoint orbits
geometric quantization on coadjoint orbitsgeometric quantization on coadjoint orbits
geometric quantization on coadjoint orbits
 
RCPE terms and cycles scenarios as of March 2024
RCPE terms and cycles scenarios as of March 2024RCPE terms and cycles scenarios as of March 2024
RCPE terms and cycles scenarios as of March 2024
 
Role of herbs in hair care Amla and heena.pptx
Role of herbs in hair care  Amla and  heena.pptxRole of herbs in hair care  Amla and  heena.pptx
Role of herbs in hair care Amla and heena.pptx
 
World Water Day 22 March 2024 - kiyorndlab
World Water Day 22 March 2024 - kiyorndlabWorld Water Day 22 March 2024 - kiyorndlab
World Water Day 22 March 2024 - kiyorndlab
 
Pests of tenai_Identification,Binomics_Dr.UPR
Pests of tenai_Identification,Binomics_Dr.UPRPests of tenai_Identification,Binomics_Dr.UPR
Pests of tenai_Identification,Binomics_Dr.UPR
 
CW marking grid Analytical BS - M Ahmad.docx
CW  marking grid Analytical BS - M Ahmad.docxCW  marking grid Analytical BS - M Ahmad.docx
CW marking grid Analytical BS - M Ahmad.docx
 

Javiera Parada: Relaxing in NGC 362*

  • 1. Relaxation in NGC 362 Javiera Parada May 8th 2019 A Richer Universe In collaboration with: I. Caiazzo, J. Heyl, H. Richer (UBC), J. Kalirai, P.Tremblay, M. Correnti, J. Cummings, B. Hansen, L. Watkins,A. Bellini, J.Anderson
  • 2. • Introduction • Proper motion cleaning • Modelling • Results • Conclusions Introduction Determine the relaxation time in the core of the globular cluster NGC 362 by tracking the positions of the youngest white dwarfs.
  • 3. • Introduction • Proper motion cleaning • Modelling • Results • Conclusions Observations in the UV HST/WFC3 UV filters F225W and F275W.
  • 4. • Introduction • Proper motion cleaning • Modelling • Results • Conclusions Observations in the UV White dwarfs
  • 5. • Introduction • Proper motion cleaning • Modelling • Results • Conclusions Colour-magnitude diagram
  • 6. • Introduction • Proper motion cleaning • Modelling • Results • Conclusions Colour-magnitude diagram White dwarfs are bright in the UV
  • 7. • Introduction • Proper motion cleaning • Modelling • Results • Conclusions Colour-magnitude diagram White dwarfs Small Magellanic Cloud stars
  • 8. • Introduction • Proper motion cleaning • Modelling • Results • Conclusions Colour-magnitude diagram White dwarfs Small Magellanic Cloud stars Other stars we don’t like
  • 9. • Introduction • Proper motion cleaning • Modelling • Results • Conclusions Proper Motion Cleaning
  • 10. • Introduction • Proper motion cleaning • Modelling • Results • Conclusions Proper Motion Cleaning
  • 11. • Introduction • Proper motion cleaning • Modelling • Results • Conclusions Completeness corrections – SMC background stars
  • 12. • Introduction • Proper motion cleaning • Modelling • Results • Conclusions Colour-magnitude diagram
  • 13. • Introduction • Proper motion cleaning • Modelling • Results • Conclusions Selecting stars • Select stars based on their position in the CMD. • Clear white dwarf sequence.
  • 14. • Introduction • Proper motion cleaning • Modelling • Results • Conclusions Tracking positions - Distributions of stars
  • 15. • Introduction • Proper motion cleaning • Modelling • Results • Conclusions Tracking positions - Distributions of stars • Young white dwarfs have recently lost close to half their mass and are just beginning to migrate outwards due to relaxation. • Older white dwarfs are already further out.
  • 16. • Introduction • Proper motion cleaning • Modelling • Results • Conclusions The relaxation time • As defined in Heyl et at. 2015 (ApJ, 804:43) 𝑡"#$%& = 𝑎* + 𝜅
  • 17. • Introduction • Proper motion cleaning • Modelling • Results • Conclusions Time dependent core radius • As defined in Heyl et at. 2015 (ApJ, 804:43) • Time dependent core radius 𝑡"#$%& = 𝑎* + 𝜅
  • 18. • Introduction • Proper motion cleaning • Modelling • Results • Conclusions Modelling the distributions • As defined in Heyl et at. 2015 (ApJ, 804:43) • Time dependent core radius • King model 𝑡"#$%& = 𝑎* + 𝜅
  • 19. • Introduction • Proper motion cleaning • Modelling • Results • Conclusions Modelling the distributions • As defined in Heyl et at. 2015 (ApJ, 804:43) • Time dependent core radius • King model 𝑡"#$%& = 𝑎* + 𝜅
  • 20. • Introduction • Proper motion cleaning • Modelling • Results • Conclusions Modelling the distributions
  • 21. • Introduction • Proper motion cleaning • Modelling • Results • Conclusions Modelling the distributions
  • 22. • Introduction • Proper motion cleaning • Modelling • Results • Conclusions Estimating 𝑎* and 𝜅 Binning Unbinned likelihood estimation White dwarfs ages Dividing WDs into faint and bright WDs
  • 23. • Introduction • Proper motion cleaning • Modelling • Results • Conclusions White dwarfs ages White dwarfs ages WD birth rate (Counting stars) WD cooling models 𝑡- = 1 𝑁̇ 1 1 𝐶3 35- Ages from F225W magnitude
  • 24. • Introduction • Proper motion cleaning • Modelling • Results • Conclusions Isochrone & cooling models • 11 Gyr isochrone built using MESA models. • Initial mass of main sequence stars currently becoming WDs is 0.81 M⦿ • Cooling curve for the 0.54 M⦿ white dwarf generated from a 0.81 M⦿ main- sequence star.