NGC 185
NGC 147 Star Formation History and Stellar Wind Feedback in Two Low Metallicity Dwarf Galaxies: NGC 147 and NGC 185
Roya Hamedani Golshan
Dr. Atefeh Javadi Dr. Jacco Th. van Loon Dr. Habib Khosroshahi
Galaxies of Many Colours: Star Formation Across 2 Wednesday, June 03, 2015 Cosmic Time Outline:
AGB stars
NGC 147 and NGC 185; Observational Data
Star Formation History
Feedback from Dusty Stellar Wind
Galaxies of Many Colours: Star Formation Across 3 Wednesday, June 03, 2015 Cosmic Time AGB stars o Mass : 0.8 – 8 �⊙ o Luminosity : 1000 – 6000 �⊙ o Effective temperature : 3000 – 4500 K o Maximum luminosity : 1 – 2.5 µm Luminosity o Age : 30 million to 10 billion yr o Long period variables : 100 – 1000 days Surface Temperature ( Spectral Class ) o Mass Loss : 10 �⊙��
Galaxies of Many Colours: Star Formation Across 7 Wednesday, June 03, 2015 Cosmic Time Target galaxies
�������=0.0015 �������= 0.0019 630 Kpc 780 Kpc
http://pixgood.com/local-group-diagram.html
Galaxies of Many Colours: Star Formation Across 10 Wednesday, June 03, 2015 Cosmic Time Observational Data NGC 147
Near Infrared Data 1.27 Kpc I. LPV
II.Cstars Kpc
Mid Infrared Data 1.27 I. Spitzer
Galaxies of Many Colours: Star Formation Across 11 Wednesday, June 03, 2015 Cosmic Time Observational Data NGC 185
Near Infrared Data 1.16 Kpc I. LPV
II.Cstars Kpc
Mid Infrared Data 1.16 I. Spitzer
Galaxies of Many Colours: Star Formation Across 12 Wednesday, June 03, 2015 Cosmic Time Star Formation History
Luminosity Mass Age
Pulsation duration
Star formation rate
Galaxies of Many Colours: Star Formation Across 13 Wednesday, June 03, 2015 Cosmic Time Star Formation History
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�� ∫ � � � �� �(�) = �� ( ) ∫ ( ) � � ��
Galaxies of Many Colours: Star Formation Across 14 Wednesday, June 03, 2015 Cosmic Time Using Padova model to drive SFH
Galaxies of Many Colours: Star Formation Across 15 Wednesday, June 03, 2015 Cosmic Time Deriving initial mass & age
Galaxies of Many Colours: Star Formation Across 16 Wednesday, June 03, 2015 Cosmic Time Pulsation duration
Galaxies of Many Colours: Star Formation Across 17 Wednesday, June 03, 2015 Cosmic Time Star Formation History in NGC 147
7 Gyr
78% of total Mass
� Total Mass Converted to Stars: �.� × �� ���� Galaxies of Many Colours: Star Formation Across 18 Wednesday, June 03, 2015 Cosmic Time Star Formation History in NGC 185
10 Gyr
61% of total Mass
� Total Mass Converted to Stars: �.� × �� ����
Galaxies of Many Colours: Star Formation Across 20 Wednesday, June 03, 2015 Cosmic Time Feedback from Dusty Stellar Wind By Using DUSTY code Deriving the total injected dust into the ISM
AGB Optical color depth
Mass Loss
Bolometric Luminosity correction
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Galaxies of Many Colours: Star Formation Across 24 Wednesday, June 03, 2015 Cosmic Time Feedback from Dusty Stellar Wind
Galaxies of Many Colours: Star Formation Across 25 Wednesday, June 03, 2015 Cosmic Time Feedback from Dusty Stellar Wind
� = � + �� Javadi et al. (2013) Galaxies of Many Colours: Star Formation Across 26 Wednesday, June 03, 2015 Cosmic Time Feedback from Dusty Stellar Wind
� � ��� = � + �� + �� + �� Javadi et al. (2013) Galaxies of Many Colours: Star Formation Across 27 Wednesday, June 03, 2015 Cosmic Time Feedback from Dusty Stellar Wind
� ��/�⁄��/��̇ = �������� Javadi et al. (2013) Galaxies of Many Colours: Star Formation Across 28 Wednesday, June 03, 2015 Cosmic Time Results:
� � • The total mass converted to stars is �. � × �� and �. � × �� ���� in NGC 147 and NGC 185 respectively.
• Each galaxy shows one peak of star formation, which relates to the time when galaxy formed.
• Each galaxy shows one peak of star formation, however star formation rate in NGC 185 decrease to the lower amount more steeply than SFR in NGC 147.
� � � • The total mass loss rate is �. � × �� and �. � × �� ���� �� in NGC 147 and NGC 185 respectively.
Galaxies of Many Colours: Star Formation Across 29 Wednesday, June 03, 2015 Cosmic Time Future Works: Map of Dust DUSTiNGS: follow up observations with INT JWST project: low metallicity environments
Galaxies of Many Colours: Star Formation Across 32 Wednesday, June 03, 2015 Cosmic Time “No man is an island.”
Galaxies of Many Colours: Star Formation Across 33 Wednesday, June 03, 2015 Cosmic Time Super AGB stars
Galaxies of Many Colours: Star Formation Across 34 Wednesday, June 03, 2015 Cosmic Time Super AGB stars
Galaxies of Many Colours: Star Formation Across 35 Wednesday, June 03, 2015 Cosmic Time Galaxies of Many Colours: Star Formation Across 36 Wednesday, June 03, 2015 Cosmic Time Galaxies of Many Colours: Star Formation Across 37 Wednesday, June 03, 2015 Cosmic Time Galaxies of Many Colours: Star Formation Across 38 Wednesday, June 03, 2015 Cosmic Time Galaxies of Many Colours: Star Formation Across 39 Wednesday, June 03, 2015 Cosmic Time Star Formation History
�� = � � ��
�(� ��) ��� ∫ � � �� ∫��� ���� � �� �(�) ��� �� � = ��(�) ��� �� � = � � �� ��� ∫��� ���� � � �� ∫��� ���� � � ��
�(� ��) �� ∫ � � �� �� � = �� � �(�) ��� �� �� � = ��(�) ��� ∫��� ���� � ��
�� ∫ � � � �� �(�) = �� ( ) ∫ ( ) � � �� Galaxies of Many Colours: Star Formation Across 40 Wednesday, June 03, 2015 Cosmic Time Hot Bottom Burning
http://moca.monash.edu/research/sins.html Galaxies of Many Colours: Star Formation Across 41 Wednesday, June 03, 2015 Cosmic Time 1.5 Mpc
http://pixgood.com/local-group-diagram.html Galaxies of Many Colours: Star Formation Across 42 Wednesday, June 03, 2015 Cosmic Time http://essayweb.net/astronomy/blackhole.shtml) Galaxies of Many Colours: Star Formation Across 43 Wednesday, June 03, 2015 Cosmic Time