2011A&A...534A..50M


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.24CEST05:04:41

2011A&A...534A..50M - Astronomy and Astrophysics, volume 534A, 50-50 (2011/10-1)

Dark matter halos around isolated ellipticals.

MEMOLA E., SALUCCI P. and BABIC A.

Abstract (from CDS):

We investigate the distribution of the luminous and the dark matter components in the isolated ellipticals NGC 7052 and NGC 7785, which are embedded in an emitting hot gas halo, by means of relevant X-ray and photometric data. To calculate the dark matter distribution in these rare objects, we performed an improved X-ray analysis of the XMM-Newton data of NGC 7785, and we used former results based on Chandra data of NGC 7052. For each object we also derived the stellar spheroid length scale from the surface photometry and the spheroid stellar mass from an analysis of the galaxy spectral energy distribution. We find that a dark matter component is present in these objects. It is subdominant and mixed with the luminous matter inside the optical region half-light radius wide, while it dominates the gravitational potential at outer radii. On the whole, the dark halo structure is very similar to that found around spirals of comparable luminosity and it is well reproduced by a Burkert halo, while a Sersic spheroid accounts well for the baryonic component.

Abstract Copyright:

Journal keyword(s): galaxies: elliptical and lenticular, cD - X-rays: galaxies - galaxies: photometry - dark matter

Simbad objects: 7

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Number of rows : 7

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 IC 1531 rG 00 09 35.5577550180 -32 16 36.933264905   13.48   11.90   ~ 55 1
2 NGC 57 GiG 00 15 30.873 +17 19 42.22   13.7       ~ 76 0
3 RXC J0252.8-0116 ClG 02 52 49.4 -01 16 27           ~ 99 0
4 NGC 1132 GiG 02 52 51.82 -01 16 29.0   13.9   12.16   ~ 140 0
5 NGC 7052 rG 21 18 33.047 +26 26 48.65 15.52 14.85 13.09     ~ 290 1
6 NGC 7785 G 23 55 19.036 +05 54 57.16   13.00       ~ 167 0
7 NGC 7796 G 23 58 59.810 -55 27 30.12   12.36 11.30 10.82   ~ 104 0

    Equat.    Gal    SGal    Ecl

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2019.10.24-05:04:41

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