2005ApJ...630..280M


Query : 2005ApJ...630..280M

2005ApJ...630..280M - Astrophys. J., 630, 280-297 (2005/September-1)

XMM-Newton observation of an X-ray trail between the spiral galaxy NGC 6872 and the central elliptical galaxy NGC 6876 in the Pavo group.

MACHACEK M.E., NULSEN P., STIRBAT L., JONES C. and FORMAN W.R.

Abstract (from CDS):

We present XMM-Newton observations of a trail of enhanced X-ray emission extending along the full 8'.7x4' region between the large spiral galaxy NGC 6872 and the dominant elliptical galaxy NGC 6876 in the Pavo group, the first known X-ray trail associated with a spiral galaxy in a poor galaxy group and, with a projected length of 90 kpc, one of the longest known X-ray trails. The X-ray surface brightness in the trail region is roughly constant beyond ∼20 kpc of NGC 6876 in the direction of the spiral galaxy. The trail is hotter (∼1 keV) than the undisturbed Pavo IGM (∼0.5 keV) and has low metal abundances (0.2 Z). The 0.5-2 keV luminosity of the trail, measured using a 67x90 kpc rectangular region, is 6.6x1040 ergs/s. We compare the properties of gas in the trail to the spectral properties of gas in the spiral galaxy NGC 6872 and in the elliptical galaxy NGC 6876 to constrain its origin. We suggest that the X-ray trail is either IGM gas gravitationally focused into a Bondi-Hoyle wake, a thermal mixture of ∼60% Pavo IGM gas with ∼40% galaxy gas that has been removed from the spiral galaxy NGC 6872 by turbulent viscous stripping, or both, due to the spiral galaxy's supersonic motion at angle ξ∼40° with respect to the plane of the sky, through the densest region of the Pavo IGM. Assuming ξ=40° and a filling factor η in a cylindrical volume with radius 33 kpc and projected length 90 kpc, the mean electron density and total hot gas mass in the trail are 1x10–3η–1/2/cm3 and 1.1x1010η1/2 M, respectively.

Abstract Copyright:

Journal keyword(s): Galaxies: Clusters: General - Galaxies: Individual: NGC Number: NGC 6876 - Galaxies: Individual: NGC Number: NGC 6872 - Galaxies: Intergalactic Medium - X-Rays: Galaxies

Simbad objects: 14

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Number of rows : 14
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 ACO S 373 ClG 03 38 30 -35 27.3           ~ 1631 0
2 NGC 1404 GiP 03 38 51.917 -35 35 39.81 11.53 10.69 10.00 9.03   ~ 687 1
3 M 86 GiG 12 26 11.814 +12 56 45.49 10.32 9.83 8.90   7.50 ~ 1026 1
4 NAME Vir I ClG 12 26 32.1 +12 43 24   10.00 8.49     ~ 6086 0
5 M 49 Sy2 12 29 46.798 +08 00 01.48   13.21 12.17     ~ 1994 2
6 NGC 4522 GiG 12 33 39.657 +09 10 29.54   13.6       ~ 339 0
7 M 89 LIN 12 35 39.8073444 +12 33 22.830809 11.29 10.73 9.75     ~ 943 2
8 NAME NGC 5171 Group GrG 13 29 22.3 +11 47 31     4.7     ~ 71 0
9 NGC 6872 IG 20 16 56.4029251107 -70 46 05.071599597   11.97 11.59 10.71 11.9 ~ 81 0
10 IC 4970 IG 20 16 57.9 -70 44 57   14.16 13.88 13.06   ~ 26 0
11 NAME Pavo Cluster ClG 20 18 14.2 -70 50 41           ~ 47 0
12 NGC 6876 GiG 20 18 19.146 -70 51 31.80   11.76 11.54 10.45   ~ 122 0
13 TYC 9311-35-1 * 20 18 36.017 -70 51 13.85   13.17 12.61 11.83   ~ 33 0
14 NGC 6880 GiG 20 19 29.663 -70 51 35.64   13.18 13.35 11.94   ~ 38 0

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2021.09.22-12:45:38

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