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Title: Structural and stellar-population properties versus bulge types in Sloan Digital Sky Survey central galaxies

Abstract

ABSTRACT This paper studies pseudo-bulges (P-bulges) and classical bulges (C-bulges) in Sloan Digital Sky Survey (SDSS) central galaxies using the new bulge indicator ΔΣ1, which measures relative central stellar-mass surface density within 1 kpc. We compare ΔΣ1 to the established bulge-type indicator Δ〈μe〉 from Gadotti (2009) and show that classifying by ΔΣ1 agrees well with Δ〈μe〉. ΔΣ1 requires no bulge–disc decomposition and can be measured on SDSS images out to z = 0.07. Bulge types using it are mapped on to 20 different structural and stellar-population properties for 12 000 SDSS central galaxies with masses 10.0 < log M*/M⊙ < 10.4. New trends emerge from this large sample. Structural parameters show fairly linear log–log relations versus ΔΣ1 and Δ〈μe〉 with only moderate scatter, while stellar-population parameters show a highly non-linear ‘elbow’ in which specific star formation rate remains roughly flat with increasing central density and then falls rapidly at the elbow, where galaxies begin to quench. P-bulges occupy the low-density end of the horizontal arm of the elbow and are universally star forming, while C-bulges occupy the elbow and the vertical branch and exhibit a wide range of star formation rates at a fixed density. The non-linear relation between central density and starmore » formation rate has been seen before, but this mapping on to bulge class is new. The wide range of star formation rates in C-bulges helps to explain why bulge classifications using different parameters have sometimes disagreed in the past. The elbow-shaped relation between density and stellar indices suggests that central structure and stellar populations evolve at different rates as galaxies begin to quench.« less

Authors:
ORCiD logo [1];  [2]; ORCiD logo [3];  [4];  [5];  [2];  [6]; ORCiD logo [7];  [2];  [8];  [9];  [10]; ORCiD logo [11];  [12];  [13]
  1. National Astronomical Observatories, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing 100012, China, Department of Astronomy and Astrophysics, University of California at Santa Cruz, Santa Cruz, CA 95064, USA, School of Astronomy and Space Science, Nanjing University, Nanjing, Jiangsu 210093, China
  2. UCO/Lick Observatory, Department of Astronomy and Astrophysics, University of California, Santa Cruz, CA 95064, USA
  3. Department of Astronomy and Astrophysics, University of California at Santa Cruz, Santa Cruz, CA 95064, USA, Instituto de Astronomía, Universidad Nacional Autónoma de México, A. P. 70-264, 04510 México, D.F., México
  4. Department of Physics and Astronomy, University of Victoria, PO Box 1700 STN CSC, Victoria, BC V8W 2Y2, Canada
  5. Department of Physics and Astronomy, University of Missouri, Columbia, MO 65211, USA
  6. Physics Department, University of California, Santa Cruz, CA 95064, USA
  7. Shanghai Key Lab for Astrophysics, Shanghai Normal University, 100 Guilin Road, Shanghai 200234, China
  8. Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030, China
  9. Department of Physics, University of the Pacific, 3601 Pacific Avenue, Stockton, CA 95211, USA
  10. Orange Coast College, Costa Mesa, CA 92626, USA
  11. Department of Astronomy and Astrophysics, University of California at Santa Cruz, Santa Cruz, CA 95064, USA
  12. GEPI, Observatoire de Paris, CNRS, Université Paris Diderot, 61, Avenue de l’Observatoire, F-75014 Paris, France
  13. National Astronomical Observatories, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing 100012, China, Department of Astronomy and Tsinghua Centre for Astrophysics, Tsinghua University, Beijing 100084, China
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1601899
Resource Type:
Published Article
Journal Name:
Monthly Notices of the Royal Astronomical Society
Additional Journal Information:
Journal Name: Monthly Notices of the Royal Astronomical Society Journal Volume: 493 Journal Issue: 2; Journal ID: ISSN 0035-8711
Publisher:
Oxford University Press
Country of Publication:
United Kingdom
Language:
English

Citation Formats

Luo, Yifei, Faber, S. M., Rodríguez-Puebla, Aldo, Woo, Joanna, Guo, Yicheng, Koo, David C., Primack, Joel R., Chen, Zhu, Yesuf, Hassen M., Lin, Lin, Barro, Guillermo, Fang, Jerome J., Pandya, Viraj, Huertas-Company, M., and Mao, Shude. Structural and stellar-population properties versus bulge types in Sloan Digital Sky Survey central galaxies. United Kingdom: N. p., 2020. Web. doi:10.1093/mnras/staa328.
Luo, Yifei, Faber, S. M., Rodríguez-Puebla, Aldo, Woo, Joanna, Guo, Yicheng, Koo, David C., Primack, Joel R., Chen, Zhu, Yesuf, Hassen M., Lin, Lin, Barro, Guillermo, Fang, Jerome J., Pandya, Viraj, Huertas-Company, M., & Mao, Shude. Structural and stellar-population properties versus bulge types in Sloan Digital Sky Survey central galaxies. United Kingdom. doi:10.1093/mnras/staa328.
Luo, Yifei, Faber, S. M., Rodríguez-Puebla, Aldo, Woo, Joanna, Guo, Yicheng, Koo, David C., Primack, Joel R., Chen, Zhu, Yesuf, Hassen M., Lin, Lin, Barro, Guillermo, Fang, Jerome J., Pandya, Viraj, Huertas-Company, M., and Mao, Shude. Tue . "Structural and stellar-population properties versus bulge types in Sloan Digital Sky Survey central galaxies". United Kingdom. doi:10.1093/mnras/staa328.
@article{osti_1601899,
title = {Structural and stellar-population properties versus bulge types in Sloan Digital Sky Survey central galaxies},
author = {Luo, Yifei and Faber, S. M. and Rodríguez-Puebla, Aldo and Woo, Joanna and Guo, Yicheng and Koo, David C. and Primack, Joel R. and Chen, Zhu and Yesuf, Hassen M. and Lin, Lin and Barro, Guillermo and Fang, Jerome J. and Pandya, Viraj and Huertas-Company, M. and Mao, Shude},
abstractNote = {ABSTRACT This paper studies pseudo-bulges (P-bulges) and classical bulges (C-bulges) in Sloan Digital Sky Survey (SDSS) central galaxies using the new bulge indicator ΔΣ1, which measures relative central stellar-mass surface density within 1 kpc. We compare ΔΣ1 to the established bulge-type indicator Δ〈μe〉 from Gadotti (2009) and show that classifying by ΔΣ1 agrees well with Δ〈μe〉. ΔΣ1 requires no bulge–disc decomposition and can be measured on SDSS images out to z = 0.07. Bulge types using it are mapped on to 20 different structural and stellar-population properties for 12 000 SDSS central galaxies with masses 10.0 < log M*/M⊙ < 10.4. New trends emerge from this large sample. Structural parameters show fairly linear log–log relations versus ΔΣ1 and Δ〈μe〉 with only moderate scatter, while stellar-population parameters show a highly non-linear ‘elbow’ in which specific star formation rate remains roughly flat with increasing central density and then falls rapidly at the elbow, where galaxies begin to quench. P-bulges occupy the low-density end of the horizontal arm of the elbow and are universally star forming, while C-bulges occupy the elbow and the vertical branch and exhibit a wide range of star formation rates at a fixed density. The non-linear relation between central density and star formation rate has been seen before, but this mapping on to bulge class is new. The wide range of star formation rates in C-bulges helps to explain why bulge classifications using different parameters have sometimes disagreed in the past. The elbow-shaped relation between density and stellar indices suggests that central structure and stellar populations evolve at different rates as galaxies begin to quench.},
doi = {10.1093/mnras/staa328},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 2,
volume = 493,
place = {United Kingdom},
year = {2020},
month = {2}
}

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DOI: 10.1093/mnras/staa328

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