2010A&A...513A..78J


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.14CEST22:40:38

2010A&A...513A..78J - Astronomy and Astrophysics, volume 513, A78-78 (2010/4-1)

Direct detection of galaxy stellar halos: NGC 3957 as a test case.

JABLONKA P., TAFELMEYER M., COURBIN F. and FERGUSON A.M.N.

Abstract (from CDS):

We present a direct detection of the stellar halo of the edge-on S0 galaxy NGC 3957, using ultra-deep VLT/VIMOS V and R images. This is achieved with a sky subtraction strategy based on infrared techniques. These observations allow us to reach unprecedented high signal-to-noise ratios of up to 15kpc away from the galaxy center, rendering photon-noise negligible. The 1σ detection limits are R=30.6mag/arcsec2 and V=31.4mag/arcsec2. We conduct a thorough analysis of the possible sources of systematic errors that could affect the data: flat-fielding, differences in CCD responses, scaling of the sky background, the extended halo itself, and PSF wings. We conclude that the V-R colour of the NGC 3957 halo, calculated between 5 and 8kpc above the disc plane where the systematic errors are modest, is consistent with an old and preferentially metal-poor normal stellar population, like that revealed in nearby galaxy halos from studies of their resolved stellar content. We do not find support for the extremely red colours found in earlier studies of diffuse halo emission, which we suggest might have been due to residual systematic errors.

Abstract Copyright:

Journal keyword(s): galaxies: halos - galaxies: stellar content

Simbad objects: 8

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Number of rows : 8

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 10905 1
2 NGC 891 H2G 02 22 32.907 +42 20 53.95 11.08 10.81 9.93 7.86   ~ 1521 2
3 NAME Hubble Ultra Deep Field reg 03 32 39.0 -27 47 29           ~ 1283 0
4 M 81 Sy2 09 55 33.17306143 +69 03 55.0609270   7.89 6.94     ~ 3965 5
5 NGC 3957 GiG 11 54 01.542 -19 34 07.40   13.00   11.42   ~ 83 0
6 NGC 4013 GiG 11 58 31.417 +43 56 49.28   12.4       ~ 365 1
7 NGC 5906 GiG 15 15 53.687 +56 19 43.86   11.4       ~ 677 1
8 NAME Local Group GrG ~ ~           ~ 6973 0

    Equat.    Gal    SGal    Ecl

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2020.07.14-22:40:38

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