Two uneven sisters
| Autor: | B. Vollmer, C. Pappalardo, Ariane Lançon, Marian Soida |
|---|---|
| Přispěvatelé: | Observatoire astronomique de Strasbourg (ObAS), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
010504 meteorology & atmospheric sciences
Astrophysics::High Energy Astrophysical Phenomena FOS: Physical sciences Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics 01 natural sciences evolution [Galaxy] kinematics and dynamics [galaxies] 0103 physical sciences Galaxy formation and evolution Disc 010303 astronomy & astrophysics Galaxy cluster Astrophysics::Galaxy Astrophysics galaxies: kinematics and dynamics 0105 earth and related environmental sciences Physics Galaxy: evolution Spiral galaxy Star formation individual: NGC 4388 [galaxies] Astronomy and Astrophysics Virgo Cluster Astrophysics - Astrophysics of Galaxies Galaxy Ram pressure Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) galaxies: individual: NGC 4388 Astrophysics::Earth and Planetary Astrophysics [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] |
| Zdroj: | Astronomy and Astrophysics-A&A Astronomy and Astrophysics-A&A, EDP Sciences, 2018, 620, pp.A108. ⟨10.1051/0004-6361/201731910⟩ |
| ISSN: | 0004-6361 |
| DOI: | 10.1051/0004-6361/201731910⟩ |
| Popis: | Since the Virgo cluster is the closest galaxy cluster in the northern hemisphere, galaxy interactions can be observed in it with a kpc 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: a strongly truncated HI and Halpha 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 a recent (a few 100 Myr) quenching of the 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, Halpha, FUV, and polarized radio continuum data permits to constrain numerical simulations to derive the temporal ram pressure profile, the 3D 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 degrees 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, i.e. spiral arms, has to be taken into account. Comment: 26 pages, accepted for publication in A&A |
| Databáze: | OpenAIRE |
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