2009A&A...497..359M


C.D.S. - SIMBAD4 rel 1.7 - 2019.12.09CET22:53:27

2009A&A...497..359M - Astronomy and Astrophysics, volume 497, 359-370 (2009/4-2)

The diverse X-ray properties of four truly isolated elliptical galaxies: NGC 2954, NGC 6172, NGC 7052, and NGC 7785.

MEMOLA E., TRINCHIERI G., WOLTER A., FOCARDI P. and KELM B.

Abstract (from CDS):

We investigate the X-ray properties of four isolated elliptical galaxies, selected from the Updated Zwicky Catalog according to strict isolation criteria. Isolated galaxies are not influenced by the group/cluster environment, and their X-ray emission can be studied independently of the often overwhelming contribution of the hot intergalactic medium. They are therefore suited to studying the X-ray characteristics relative to their intrinsic properties. We analyzed our own XMM-Newton and archival Chandra data in detail for three objects, and derived, when possible, the spatial and spectral characteristics of each source. An upper limit for the fourth one was obtained from archival ASCA data. We compared their characteristics with those of other 23 isolated objects for which X-ray and optical data are available in the literature. We explored possible theoretical explanations to interpret our results. In spite of our attempt to select very homogeneous objects, both in terms of optical properties and environmental characteristics, we find a wide range in X-ray luminosities and LX/LB ratios for the four objects: two of them show a hot gaseous halo, whereas no gas is detected in the other two, to a factor >10 in luminosity. In fact, we find a large spread in the LX/LB for all galaxies considered, suggesting that the presence of hot gas is not easily related to the optical luminosity or to the mass, even in isolated systems. Younger objects tend to be less luminous in X-rays than older systems. However, it appears that older objects could span a wide range in luminosities.

Abstract Copyright:

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

Simbad objects: 24

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Number of rows : 24

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 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 M 32 IG 00 42 41.825 +40 51 54.61 9.51 9.03 8.08     ~ 1973 2
4 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 10608 1
5 NGC 821 G 02 08 21.150 +10 59 41.53   12.210 11.310 10.739 9.744 ~ 528 0
6 RXC J0252.8-0116 ClG 02 52 49.4 -01 16 27           ~ 99 0
7 NGC 1132 GiG 02 52 51.82 -01 16 29.0   13.9   12.16   ~ 141 0
8 NGC 1600 GiG 04 31 39.858 -05 05 09.97   8.9   10.81   ~ 318 0
9 ESO 306-17 BiC 05 40 06.672 -40 50 11.46   13.35   11.82   ~ 50 1
10 NGC 2271 G 06 42 52.996 -23 28 33.38   13.17   11.67   ~ 43 0
11 NGC 2865 GiG 09 23 30.205 -23 09 41.37   12.39 11.43 11.06   ~ 223 0
12 NGC 2954 LIN 09 40 24.088 +14 55 21.45   13.50       ~ 61 0
13 M 105 LIN 10 47 49.600 +12 34 53.87   10.56 9.76 9.12 8.18 ~ 1364 0
14 NAME Vir I ClG 12 26 32.1 +12 43 24   10.00 8.49     ~ 5667 0
15 M 89 LIN 12 35 39.8 +12 33 23 11.29 10.73 9.75     ~ 908 2
16 NGC 6172 G 16 22 10.3017048111 -01 30 53.440489543   14.28       ~ 34 0
17 NGC 6482 GiG 17 51 48.8334002678 +23 04 18.884647281 12.71 12.35 11.45     ~ 185 1
18 NGC 6776 G 19 25 19.131 -63 51 36.68   13.19 11.99 11.59   ~ 83 0
19 ESO 107-4 G 21 03 29.6531337822 -67 10 52.613089794   12.98 11.87 11.63   ~ 55 0
20 NGC 7052 rG 21 18 33.047 +26 26 48.65 15.52 14.85 13.09     ~ 290 1
21 NGC 7785 G 23 55 19.036 +05 54 57.16   13.00       ~ 167 0
22 ZwCl 2353+0535 ClG 23 55 37.000 +05 51 29.00           ~ 3 0
23 NGC 7796 G 23 58 59.810 -55 27 30.12   12.36 11.30 10.82   ~ 104 0
24 NAME Galactic Ridge ? ~ ~           ~ 410 1

    Equat.    Gal    SGal    Ecl

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2019.12.09-22:53:27

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