2007A&A...462...93V


C.D.S. - SIMBAD4 rel 1.7 - 2019.09.23CEST09:52:13

2007A&A...462...93V - Astronomy and Astrophysics, volume 462, 93-99 (2007/1-4)

Deep HI observations of the surroundings of ram pressure stripped Virgo spiral galaxies. Where is the stripped gas?

VOLLMER B. and HUCHTMEIER W.

Abstract (from CDS):

Deep Effelsberg 100-m HI observations of 5 HI deficient Virgo spiral galaxies are presented. No new extended HI tail is found in these galaxies. The already known HI tail north of NGC 4388 does not significantly extend further than a WSRT image has shown. Based on the absence of HI tails in a sample of 6 Virgo spiral galaxies and a balance of previous detections of extraplanar gas in the targeted galaxies we propose a global picture where the outer gas disk (beyond the optical radius R25) is removed much earlier than expected by the classical ram pressure criterion. Based on the two-phase nature of atomic hydrogen located in a galactic disk, we argue that the warm diffuse HI in the outer galactic disk is evaporated much more rapidly than the cold dense HI. Therefore, after a ram pressure stripping event we can only observe atomic hydrogen which was cold and dense before it was removed from the galactic disk. This global picture is consistent with all available observations. We detect between 0.3% and 20% of the stripped mass assuming an initially non-deficient galaxy and between 3% and 70% of the stripped mass assuming an initially HI deficient galaxy (def=0.4). Under the latter assumption we estimate an evaporation rate by dividing the missing mass by the estimated time to peak ram pressure from dynamical simulations. We find evaporation rates between 10 and 100M/yr.

Abstract Copyright:

Journal keyword(s): galaxies: evolution - galaxies: interactions - galaxies: ISM - galaxies: intergalactic medium

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 - 2019
#notes
1 NGC 4388 Sy2 12 25 46.820 +12 39 43.45 11.91 11.76 11.02     ~ 1149 2
2 NGC 4402 GiP 12 26 07.566 +13 06 46.06   12.55       ~ 348 1
3 M 86 GiG 12 26 11.814 +12 56 45.49 10.32 9.83 8.90   7.50 ~ 991 1
4 NAME Vir I ClG 12 26 32.1 +12 43 24   10.00 8.49     ~ 5620 0
5 NGC 4435 GiG 12 27 40.503 +13 04 44.48 12.23 11.74 10.80     ~ 405 2
6 NGC 4438 LIN 12 27 45.652 +13 00 30.92 11.37 11.02 10.17     ~ 562 3
7 M 87 BiC 12 30 49.42338230 +12 23 28.0438581 10.16 9.59 8.63   7.49 ~ 6003 3
8 M 88 Sy2 12 31 59.216 +14 25 13.48   14.33 13.18     ~ 713 1
9 NGC 4522 GiG 12 33 39.657 +09 10 29.54   13.6       ~ 317 0
10 M 90 Sy2 12 36 49.816 +13 09 46.33 10.56 10.26 9.54     ~ 773 1
11 3C 286 Sy1 13 31 08.2885060664 +30 30 32.960825108   17.51 17.25     ~ 3601 1

    Equat.    Gal    SGal    Ecl

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2019.09.23-09:52:13

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