2018A&A...620A.108V


C.D.S. - SIMBAD4 rel 1.7 - 2020.01.23CET00:59:26

2018A&A...620A.108V - Astronomy and Astrophysics, volume 620A, 108-108 (2018/12-1)

Two uneven sisters. I. NGC 4388 - a strongly constrained ram-pressure stripping event.

VOLLMER B., PAPPALARDO C., SOIDA M. and LANCON A.

Abstract (from CDS):

Since the Virgo cluster is the closest galaxy cluster in the northern hemisphere, galaxy interactions can be observed in it at kiloparsec resolution. The spiral galaxy NGC 4388 underwent a ram-pressure stripping event ∼200 Myr ago caused by its highly eccentric orbit within the Virgo cluster. This galaxy fulfills all diagnostic criteria for having undergone active ram-pressure stripping in the recent past: it has a strongly truncated HI and Hα disk, an asymmetric ridge of polarized radio continuum emission, extended extraplanar gas toward the opposite side of the ridge of polarized radio continuum emission, and has undergone a recent (a few hundred million years ago) quenching of its star formation activity in the outer, gas-free galactic disk. We made dynamical simulations of the ram-pressure stripping event to investigate the influence of galactic structure on the observed properties of NGC 4388. The combination of a deep optical spectrum of the outer gas-free region of the galactic disk together with deep HI, Hα, far-ultraviolet, and polarized radio continuum data allows us to constrain numerical simulations to derive the temporal ram-pressure profile, the three-dimensional velocity vector of the galaxy, and the time since peak ram pressure with a high level of confidence. From the simulations, an angle between the ram-pressure wind and the galactic disk of 30° is derived. The galaxy underwent peak ram pressure ∼240 Myr ago. The observed asymmetries in the disk of NGC 4388 are not caused by the present action of ram pressure, but by the resettling of gas that has been pushed out of the galactic disk during the ram-pressure stripping event. For the detailed reproduction of multi-wavelength observations of a spiral galaxy that undergoes or underwent a ram-pressure stripping event, galactic structure, such as spiral arms for example, must be taken into account.

Abstract Copyright: © ESO 2018

Journal keyword(s): Galaxy: evolution - galaxies: kinematics and dynamics - galaxies: individual: NGC 4388

Simbad objects: 10

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Number of rows : 10

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NGC 3521 LSB 11 05 48.5676206040 -00 02 09.228156576 10.06 9.83 9.02 10.1 9.6 ~ 680 2
2 NGC 4388 Sy2 12 25 46.820 +12 39 43.45 11.91 11.76 11.02     ~ 1164 2
3 NGC 4402 GiP 12 26 07.566 +13 06 46.06   12.55       ~ 351 1
4 M 86 GiG 12 26 11.814 +12 56 45.49 10.32 9.83 8.90   7.50 ~ 1000 1
5 NAME Vir I ClG 12 26 32.1 +12 43 24   10.00 8.49     ~ 5699 0
6 M 87 BiC 12 30 49.42338230 +12 23 28.0438581 10.16 9.59 8.63   7.49 ~ 6079 3
7 M 88 Sy2 12 31 59.216 +14 25 13.48   14.33 13.18     ~ 718 1
8 NGC 4522 GiG 12 33 39.657 +09 10 29.54   13.6       ~ 321 0
9 M 90 Sy2 12 36 49.816 +13 09 46.33 10.56 10.26 9.54     ~ 781 1
10 M 63 LIN 13 15 49.2738527699 +42 01 45.726078017   9.34 8.59 8.35   ~ 1031 2

    Equat.    Gal    SGal    Ecl

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2020.01.23-00:59:26

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