2011A&A...531A..44W


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.21CEST15:57:29

2011A&A...531A..44W - Astronomy and Astrophysics, volume 531A, 44-44 (2011/7-1)

Hot gas in Mach cones around Virgo cluster spiral galaxies.

WEZGOWIEC M., VOLLMER B., EHLE M., DETTMAR R.-J., BOMANS D.J., CHYZY K.T., URBANIK M. and SOIDA M.

Abstract (from CDS):

The detailed comparison between observations and simulations of ram-pressure stripped spiral galaxies in the Virgo cluster has led to a 3D view of the galaxy orbits within the hot intracluster medium. The 3D velocities and Mach numbers derived from simulations can be used to derive simple Mach cone geometries for Virgo spiral galaxies. We search for indications of hot gas within Mach cones in X-ray observations of selected Virgo cluster spiral galaxies (NGC 4569, NGC 4388, and NGC 4501). Low-resolution maps of diffuse extended emission and X-ray spectra from XMM-Newton observations are presented. Gas densities and temperatures were derived from the X-ray spectra. We find extraplanar diffuse X-ray emission in all galaxies. Based on the 3D velocity vectors from dynamical modeling, a simple Mach cone is fitted to the triangular shape of NGC 4569's diffuse X-ray emission. Assuming that all extraplanar diffuse X-ray emission has to be located inside the Mach cone, we also fit Mach cones to NGC 4388's and NGC 4501's extraplanar X-ray emission. For NGC 4569 it is hard to reconcile the derived Mach cone opening angle with a Mach number based on the sound speed alone. Instead, a Mach number involving the Alfvenic speed seems to be more appropriate, yielding a magnetic field strength of ∼1-3µG for an intracluster medium density of n∼10–4cm–3. Whereas the temperature of the hot component of NGC 4569's X-ray halo (0.5keV) is at the high end, but typical of a galactic outflow, the temperature of the hot gas tails of NGC 4388 and NGC 4501 are significantly hotter (0.7-0.9keV). In NGC 4569 we find direct evidence of a Mach cone that is filled with hot gas from a galactic superwind. We suggest that the high gas temperatures in the X-ray tails of NGC 4388 and NGC 4501 come from the mixing of the stripped ISM into the hot intracluster medium of the Virgo cluster.

Abstract Copyright:

Journal keyword(s): galaxies: clusters: general - galaxies: clusters: individual: Virgo - galaxies: individual: NGC 4388 - galaxies: individual: NGC 4501 - galaxies: individual: NGC 4569 - galaxies: clusters: intracluster medium

CDS comments: Paragraph.1 C153 is probably CXOU J153952.8+660954.

Simbad objects: 21

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Number of rows : 21

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 NGC 253 SyG 00 47 33.134 -25 17 19.68   8.03   6.94 8.1 ~ 2858 2
2 NGC 2276 IG 07 27 14.485 +85 45 16.20   12.3       ~ 337 0
3 NAME NGC 2300 Group GrG 07 32 22.84 +85 42 26.3           ~ 50 0
4 UGC 6697 GiG 11 43 49.078 +19 58 06.46 13.96 14.35 13.59 13.29   ~ 195 2
5 ACO 1367 ClG 11 44 44.6 +19 41 59           ~ 975 1
6 NGC 4388 Sy2 12 25 46.820 +12 39 43.45 11.91 11.76 11.02     ~ 1154 2
7 M 86 GiG 12 26 11.814 +12 56 45.49 10.32 9.83 8.90   7.50 ~ 994 1
8 NAME Vir I ClG 12 26 32.1 +12 43 24   10.00 8.49     ~ 5645 0
9 M 87 BiC 12 30 49.42338230 +12 23 28.0438581 10.16 9.59 8.63   7.49 ~ 6027 3
10 M 88 Sy2 12 31 59.216 +14 25 13.48   14.33 13.18     ~ 714 1
11 NGC 4522 GiG 12 33 39.657 +09 10 29.54   13.6       ~ 319 0
12 IC 3583 GiG 12 36 43.558 +13 15 32.93   13.31       ~ 151 1
13 M 90 Sy2 12 36 49.816 +13 09 46.33 10.56 10.26 9.54     ~ 777 1
14 NGC 4654 GiP 12 43 56.638 +13 07 34.86   11.8       ~ 494 1
15 NGC 4848 AGN 12 58 05.5774186519 +28 14 33.264194270   14.2   13.53   ~ 167 0
16 ACO 1656 ClG 12 59 48.7 +27 58 50           ~ 4096 2
17 [MOH2004] J153952.6+660954 GiC 15 39 52.87 +66 09 54.0           ~ 3 0
18 ACO 2125 ClG 15 41 14.1 +66 15 57           ~ 118 1
19 ESO 137-1 G 16 13 27.305 -60 45 50.59   14.84   13.87   ~ 80 0
20 ESO 137-2 GiG 16 13 35.651 -60 51 54.60   13.75   12.43   ~ 32 0
21 ACO 3627 ClG 16 14 22.5 -60 52 07           ~ 242 2

    Equat.    Gal    SGal    Ecl

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2019.10.21-15:57:29

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