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Halo Mass Estimation for Galaxy Groups: The Role Of Magnitude Gaps

Published online by Cambridge University Press:  09 May 2016

Yi Lu ,
Xiaohu Yang  and
Shiyin Shen
Yi Lu
Affiliation:
Key Laboratory for Research in Galaxies and Cosmology, Shanghai Astronomical Observatory, Nandan Road 80, Shanghai 200030, China email: luyi@shao.ac.cn
Xiaohu Yang
Affiliation:
Key Laboratory for Research in Galaxies and Cosmology, Shanghai Astronomical Observatory, Nandan Road 80, Shanghai 200030, China email: luyi@shao.ac.cn Center for Astronomy and Astrophysics, Shanghai Jiao Tong University, Shanghai 200240, China email: xyang@sjtu.edu.cn
Shiyin Shen
Affiliation:
Key Laboratory for Research in Galaxies and Cosmology, Shanghai Astronomical Observatory, Nandan Road 80, Shanghai 200030, China email: luyi@shao.ac.cn
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Abstract

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We find that for the galaxy groups, the luminosity gap between the brightest and the subsequent brightest member galaxies in a halo (group) can be used to significantly reduce the scatter in the halo mass estimation based on the luminosity of the brightest galaxy alone. These corrections can significantly reduce the scatter in the halo mass estimations by ~ 50% to ~ 70% in massive halos.

Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , Issue S317: The General Assembly of Galaxy Halos: Structure, Origin and Evolution , August 2015 , pp. 332 - 333
Copyright
Copyright © International Astronomical Union 2016 

References

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