Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Do cluster galaxies have extended dark halos?   We present the results of the application of the methodology introduced by
Natarajan & Kneib (1997) to interpret local perturbations to the cluster shear
field resulting from mass associated with individual cluster galaxies. The
lensing signal is used to place new constraints on the average mass-to-light
ratio and spatial extents of the dark matter halos associated with
morphologically-classified early-type cluster members in the Abell cluster
AC114. The total mass of a fiducial $L^\ast$ cluster spheroidal galaxy is found
to be largely contained within $\sim$ 15 kpc radius halo ($\sim$~8--10 $R_e$)
with a mass-to-light ratio ${M/L_V} \sim {15^{+10}_{-4}} $ (90 % c.l.) in solar
units within this radius. Comparisons with similar estimates for field galaxies
suggests that the cluster galaxies in AC114 may possess less extensive and less
massive halos. Additionally, there is some indication that, at a fixed
luminosity, S0 galaxies are less extended than ellipticals, suggesting a
difference in the efficiency of tidal stripping for different galaxy types.
These results enable us to probe the variation of the mass-to-light ratio with
scale via gravitational lensing methods. Therefore, the prospects for
constraining the mass density of the Universe and understanding galaxy
evolution using these gravitational lensing methods are very promising.

7
The categories of this paper are: hep-th
5
The categories of this paper are: gr-qc
2
The categories of this paper are: math
27
The categories of this paper are: comp-gas
36
The categories of this paper are: cmp-lg
29
The categories of this paper are: funct-an
3
The categories of this paper are: physics
32
The categories of this paper are: atom-ph
19
The categories of this paper are: eess
8
The categories of this paper are: hep-ex
37
The categories of this paper are: supr-con
25
The categories of this paper are: patt-sol
34
The categories of this paper are: chem-ph
11
The categories of this paper are: hep-lat
22
The categories of this paper are: chao-dyn
24
The categories of this paper are: dg-ga