2006MNRAS.370.1541S

Query : 2006MNRAS.370.1541S

2006MNRAS.370.1541S - Mon. Not. R. Astron. Soc., 370, 1541-1555 (2006/August-2)

X-ray observations of three young, early-type galaxies.

SANSOM A.E., O'SULLIVAN E., FORBES D.A., PROCTOR R.N. and DAVIS D.S.

Abstract (from CDS):

Massive haloes of hot plasma exist around some, but not all elliptical galaxies. There is evidence that this is related to the age of the galaxy. In this paper, new X-ray observations are presented for three early-type galaxies that show evidence of youth, in order to investigate their X-ray components and properties. NGC 5363 and NGC 2865 were found to have X-ray emission dominated by purely discrete stellar sources. Limits are set on the mass distribution in one of the galaxies observed with XMM-Newton, NGC 4382, which contains significant hot gas. We detect the X-ray emission in NGC 4382 out to 4re. The mass-to-light ratio is consistent with a stellar origin in the inner regions but rises steadily to values indicative of some dark matter by 4re. These results are set in context with other data drawn from the literature, for galaxies with ages estimated from dynamical or spectroscopic indicators. Ages obtained from optical spectroscopy represent central luminosity-weighted stellar ages. We examine the X-ray evolution with age, normalized by B- and K-band luminosities. Low values of Log(LX/LB) and Log(LX/LK) are found for all galaxies with ages between 1 and 4 Gyr. Luminous X-ray emission only appears in older galaxies. This suggests that the interstellar medium is removed and then it takes several gigayears for hot gas haloes to build up, following a merger. A possible mechanism for gas expulsion might be associated with feedback from an active nucleus triggered during a merger.

Abstract Copyright: 2006 The Authors. Journal compilation © 2006 RAS

Journal keyword(s): galaxies: evolution - galaxies: individual: NGC 4382 - galaxies: individual: NGC 5363 - galaxies: individual: NGC 2865 - galaxies: ISM - X-rays: galaxies

Simbad objects: 52

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Number of rows : 52
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 NGC 520 AG? 01 24 34.90 +03 47 29.4 12.41 12.24 11.42     ~ 513 3
2 NGC 821 AG? 02 08 21.1358498040 +10 59 41.832436704   12.210 11.310 10.739 9.744 ~ 572 0
3 IC 214 G 02 14 05.586 +05 10 23.37   14.4       ~ 149 0
4 NGC 1600 GiG 04 31 39.858 -05 05 09.97   8.9   10.81   ~ 381 0
5 NGC 1700 EmG 04 56 56.3160873072 -04 51 56.794713228   12   11.14   ~ 348 1
6 NGC 2341 AG? 07 09 11.893 +20 36 10.21   13.65 12.88     ~ 80 0
7 NGC 2342 H2G 07 09 18.089 +20 38 09.22   12.92 12.15     ~ 119 0
8 NGC 2623 LIN 08 38 24.016 +25 45 16.29 14.10 13.99 13.36     ~ 498 1
9 NGC 2782 Sy2 09 14 05.1 +40 06 49 12.29 12.30 11.63     ~ 472 3
10 NGC 2865 GiG 09 23 30.205 -23 09 41.37   12.39 11.43 11.06   ~ 240 0
11 1RXS J092344.1-230858 X 09 23 44.1 -23 08 58           ~ 2 0
12 NGC 2993 Sy1 09 45 48.325 -14 22 06.02 12.72 13.11 12.64 13.4 13.0 ~ 182 1
13 NGC 3256 Sy2 10 27 51.284 -43 54 13.55   11.83 11.33 10.62 11.9 ~ 848 2
14 NGC 3310 AGN 10 38 45.85707 +53 30 11.8940   12.45 12.15     ~ 773 1
15 M 105 LIN 10 47 49.600 +12 34 53.87   10.56 9.76 9.12 8.18 ~ 1463 0
16 NGC 3395 GiP 10 49 50.1160141680 +32 58 58.421838360   12.1 12.10     ~ 277 2
17 APG 270 PaG 10 49 51.2 +32 58 58           ~ 185 0
18 NGC 3585 GiG 11 13 17.109 -26 45 17.96   10.64   9.22   ~ 289 0
19 UGC 6472 C G 11 28 30.70 +58 33 48.4           ~ 351 0
20 NGC 3690 IG 11 28 31.0 +58 33 41   13.19 12.86     ~ 978 4
21 NAME NGC 3690 West GiP 11 28 31.02 +58 33 40.7   11.8       ~ 629 4
22 NAME NGC 3690 East AGN 11 28 33.07 +58 33 54.2   11.8       ~ 631 4
23 ESO 504-17 EmG 11 48 46.381 -27 22 44.69   13.99   13.27 14.1 ~ 42 0
24 NGC 3921 AG? 11 51 06.8803989360 +55 04 43.414457484   13.4 12.64     ~ 246 0
25 NGC 4038 EmG 12 01 53.002 -18 52 03.32   10.91   9.74 11.0 ~ 1333 1
26 NAME Antennae IG 12 01 53.170 -18 52 37.92           ~ 1692 0
27 NGC 4039 GiP 12 01 53.51 -18 53 10.3   11.08   9.77   ~ 1161 1
28 NGC 4365 GiG 12 24 28.228 +07 19 03.07   11.5       ~ 841 0
29 M 85 GiP 12 25 24.053 +18 11 27.89   10.2       ~ 644 0
30 NGC 4394 GiP 12 25 55.6366312872 +18 12 50.110707636   11.9       ~ 363 0
31 NGC 4473 GiG 12 29 48.878 +13 25 45.55 11.60 11.16 10.20     ~ 644 1
32 NGC 4494 GiP 12 31 24.0391348536 +25 46 30.071664120   10.55 9.74     ~ 474 0
33 NGC 4555 LIN 12 35 41.1918612696 +26 31 23.087609256   13.5       ~ 95 0
34 M 59 GiG 12 42 02.2581375168 +11 38 48.909507756   11.0       ~ 693 0
35 NGC 4636 LIN 12 42 49.8333280080 +02 41 15.951929028   12.62 11.84     ~ 1117 1
36 IC 819 AGN 12 46 10.1 +30 43 55           ~ 277 1
37 NGC 4676 IG 12 46 10.18 +30 43 53.7   14.1       ~ 310 0
38 Mrk 231 Sy1 12 56 14.2341182928 +56 52 25.238373852   14.68 13.84     ~ 1988 3
39 NGC 5102 EmG 13 21 57.6100832352 -36 37 48.395156160   9.74 9.65 8.47 10.2 ~ 367 1
40 Mrk 789 AGN 13 32 24.240 +11 06 22.59   15.41 14.87     ~ 113 0
41 NGC 5256 PaG 13 38 17.81 +48 16 41.2   14.1 13.42     ~ 430 1
42 NGC 5322 SyG 13 49 15.24 +60 11 25.8   11.3       ~ 415 2
43 NGC 5363 GiP 13 56 07.20 +05 15 17.3 12.59 12.12 10.51     ~ 227 0
44 NGC 5364 GiP 13 56 12.004 +05 00 52.06   13.2       ~ 259 0
45 IC 4553 SyG 15 34 57.22396 +23 30 11.6084   14.76 13.88     ~ 2961 4
46 NGC 6240 Sy2 16 52 58.9 +02 24 03   14.31 13.37     ~ 1637 2
47 NGC 7253 AG? 22 19 27.700 +29 23 44.85   14.4       ~ 82 0
48 NGC 7252 EmG 22 20 44.7748209648 -24 40 41.909518200 12.26 12.46 12.06 11.57   ~ 703 1
49 NGC 7714 GiP 23 36 14.1257730600 +02 09 18.197422668   14.91 14.36     ~ 765 1
50 APG 284 PaG 23 36 19 +02 09.3   12.6       ~ 607 0
51 IC 5358 BiC 23 47 45.1086508608 -28 08 26.650470372   13.42 14.72 11.99   ~ 86 1
52 APG 102A G ~ ~           ~ 7 0

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