2004MNRAS.349..535O


Query : 2004MNRAS.349..535O

2004MNRAS.349..535O - Mon. Not. R. Astron. Soc., 349, 535-546 (2004/April-1)

XMM-Newton and Chandra observations of three X-ray-faint early-type galaxies.

O'SULLIVAN E. and PONMAN T.J.

Abstract (from CDS):

We present XMM-Newton observations of three X-ray-underluminous elliptical galaxies, NGC 3585, 4494 and 5322. All three galaxies have relatively large optical luminosities (logLB= 10.35-10.67 L) but have X-ray luminosities consistent with emission from discrete sources only. In conjunction with a Chandra observation of NGC 3585, we analyse the XMM-Newton data and show that the three galaxies are dominated by discrete source emission, but do possess some X-ray-emitting gas. The gas is at relatively low temperatures, kT ≃ 0.25-0.44 keV. All three galaxies show evidence of recent dynamical disturbance and formation through mergers, including kinematically distinct cores, young stellar ages and embedded stellar discs. This leads us to conclude that the galaxies formed relatively recently and have yet to build up large X-ray haloes. They are likely to be in a developmental phase where the X-ray gas has a very low density, making it undetectable outside the galaxy core. However, if the gas is a product of stellar mass loss, as seems most probable, we would expect to observe supersolar metal abundances. While abundance is not well constrained by the data, we find best-fitting abundances <0.1 Z for single-temperature models, and it seems unlikely that we could underestimate the metallicity by such a large factor.

Abstract Copyright: 2004 RAS

Journal keyword(s): galaxies: elliptical and lenticular, cD - galaxies: individual: NGC 3585 - galaxies: individual: NGC 4494 - galaxies: individual: NGC 5322 - X-rays: galaxies

Simbad objects: 11

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Number of rows : 11
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NGC 1269 GiG 03 17 18.600 -41 06 29.05 9.85 9.83 8.81 8.72   ~ 383 1
2 NGC 1549 GiP 04 15 45.223 -55 35 32.50 11.22 10.48 9.79 9.08   ~ 227 1
3 NGC 1553 GiP 04 16 10.4711638537 -55 46 48.107262747 10.76 10.10 9.40 8.74   ~ 358 2
4 NGC 3585 GiG 11 13 17.109 -26 45 17.96   10.64   9.22   ~ 267 0
5 NGC 4365 GiG 12 24 28.228 +07 19 03.07   11.5       ~ 809 0
6 NGC 4494 GiP 12 31 24.034 +25 46 29.93   10.55 9.74     ~ 455 0
7 NGC 4697 GiG 12 48 35.8992791099 -05 48 02.497675635   10.97   9.83   ~ 818 0
8 V* RS CVn RS* 13 10 36.9078781154 +35 56 05.587686902 8.57 8.51 7.93 7.7   F6IV+G8IV 693 0
9 NAME Centaurus A Sy2 13 25 27.61509104 -43 01 08.8056025   8.18 6.84 6.66   ~ 4121 3
10 NGC 5322 SyG 13 49 15.24 +60 11 25.8   11.3       ~ 386 2
11 ACO 1835 ClG 14 01 02.07 +02 52 43.2           ~ 646 1

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2021.09.21-16:57:53

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