
TY  - JOUR
A1  - Lee, Hyun-chul 
A1  - Gibson, Brad K. 
A1  - Fenner, Yeshe 
A1  - Brook, Chris B. 
A1  - Kawata, Daisuke 
A1  - Renda, Agostino 
A1  - Holopainen, Janne 
A1  - Flynn, Chris 
T1  - Photometric Properties of White Dwarf Dominated Halos
JF  - Publications of the Astronomical Society of Australia
JO  - Publ. Astron. Soc.  Aust.
Y1  - 2004
VL  - 21
IS  - 2
SP  - 153
EP  - 156
KW  - galaxies: halos &#8212; galaxies: luminosity function, mass function &#8212; galaxies: stellar content &#8212; white dwarfs
UR  - https://doi.org/10.1071/AS04004 
N2  - Using stellar population synthesis techniques, we explore the photometric signatures of white dwarf progenitor dominated galactic halos, in order to constrain the fraction of halo mass that may be locked up in white dwarf stellar remnants. We first construct a 109 M&odot; stellar halo using the canonical Salpeter initial stellar mass distribution, and then allow for an additional component of low- and intermediate-mass stars, which ultimately give rise to white dwarf remnants. Microlensing observations towards the Large Magellanic Cloud, coupled with several ground-based proper motion surveys, have led to claims that in excess of 20% of the dynamical mass of the halo (1012 M&odot;) might be found in white dwarfs. Our results indicate that (1)&#160;even if only 1% of the dynamical mass of the dark halo today could be attributed to white dwarfs, their main sequence progenitors at high redshift (z &#x2248; 3) would have resulted in halos more than 100 times more luminous than those expected from conventional initial mass functions alone, and (2) any putative halo white dwarf progenitor dominated initial mass function component, regardless of its dynamical importance, would be virtually impossible to detect at the present day, due to its extremely faint surface brightness. 
ER  -

