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23 April 2024 |
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The galaxy luminosity function in groups and clusters: the faint-end upturn and the connection to the field luminosity function | | Ting-Wen Lan
; Brice Ménard
; Houjun Mo
; | | Date: |
25 Sep 2015 | | Abstract: | We characterize the luminosity functions of galaxies residing in $zsim0$
groups and clusters over the broadest ranges of luminosity and mass reachable
by the Sloan Digital Sky Survey. Our measurements cover four orders of
magnitude in luminosity, down to about $M_r=-12$ mag or $L=10^7,L_odot$, and
three orders of magnitude in halo mass, from $10^{12}$ to $10^{15} , {
m
M}_odot$. We find a characteristic scale, $M_rsim-18$ mag or $Lsim10^9,
L_odot$, below which the slope of the luminosity function becomes
systematically steeper. This trend is present for all halo masses and
originates mostly from red satellite galaxies. The ubiquitous presence of this
faint-end upturn suggests that it is formation, rather than halo-specific
environmental effect, that plays a major role in regulating the stellar masses
of faint satellites. We show that the observed luminosity functions of
satellite galaxies can be described in a simple manner by a double Schechter
function with amplitudes scaling with halo mass over the entire range of
observables. Combining these conditional luminosity functions with the dark
matter halo mass function, we can accurately recover the entire field
luminosity function measured over 10 visual magnitudes. This decomposition
reveals that the field luminosity function is dominated by satellite galaxies
at magnitudes fainter than $-18$ mag or $L<10^{9},L_odot$ and central
galaxies above. We find that the luminosity functions of blue and red satellite
galaxies show distinct shapes and we present estimates of the stellar mass
fraction as a function of halo mass and galaxy type. Finally, using a simple
model, we show that the average number and the faint-end slopes of blue and red
satellite galaxies can be interpreted in terms of their formation history, with
two distinct modes separated by some characteristic time. | | Source: | arXiv, 1509.7870 | | Services: | Forum | Review | PDF | Favorites | |
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