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Ram pressure stripping of the multiphase ISM in the Virgo cluster spiral galaxy NGC 4438

dc.contributor.authorVOLLMER, B.
dc.contributor.authorSOIDA, M.
dc.contributor.authorCHUNG, A.
hal.structure.identifierDépartement de Physique [Montréal]
dc.contributor.authorCHEMIN, L.
hal.structure.identifierLaboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux [L3AB]
hal.structure.identifierLaboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]
hal.structure.identifierObservatoire aquitain des sciences de l'univers [OASU]
dc.contributor.authorBRAINE, J.
hal.structure.identifierLaboratoire d'Astrophysique de Marseille [LAM]
dc.contributor.authorBOSELLI, A.
dc.contributor.authorBECK, R.
dc.date.created2009
dc.date.issued2009
dc.identifier.issn0004-6361
dc.description.abstractEnRam pressure stripping of the multiphase ISM is studied in the perturbed Virgo cluster spiral galaxy NGC 4438. This galaxy underwent a tidal interaction ~100 Myr ago and is now strongly affected by ram pressure stripping. Deep VLA radio continuum observations at 6 and 20 cm are presented. We detect prominent extraplanar emission to the west of the galactic center, which extends twice as far as the other tracers of extraplanar material. The spectral index of the extraplanar emission does not steepen with increasing distance from the galaxy. This implies in situ re-acceleration of relativistic electrons. The comparison with multiwavelength observations shows that the magnetic field and the warm ionized interstellar medium traced by Halpha emission are closely linked. The kinematics of the northern extraplanar Halpha emission, which is ascribed to star formation, follow those of the extraplanar CO emission. In the western and southern extraplanar regions, the Halpha measured velocities are greater than those of the CO lines. We suggest that the ionized gas of this region is excited by ram pressure. The spatial and velocity offsets are consistent with a scenario where the diffuse ionized gas is more efficiently pushed by ram pressure stripping than the neutral gas. We suggest that the recently found radio-deficient regions compared to 24 mum emission are due to this difference in stripping efficiency.
dc.language.isoen
dc.publisherEDP Sciences
dc.subject.engalaxies: interactions
dc.subject.engalaxies: ISM
dc.subject.engalaxies: kinematics and dynamics
dc.subject.engalaxies: clusters: individual: Virgo
dc.subject.enradio continuum: galaxies
dc.title.enRam pressure stripping of the multiphase ISM in the Virgo cluster spiral galaxy NGC 4438
dc.typeArticle de revue
dc.identifier.doi10.1051/0004-6361/200811140
dc.subject.halPhysique [physics]/Astrophysique [astro-ph]/Cosmologie et astrophysique extra-galactique [astro-ph.CO]
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]/Planétologie et astrophysique de la terre [astro-ph.EP]
dc.subject.halPhysique [physics]/Astrophysique [astro-ph]/Planétologie et astrophysique de la terre [astro-ph.EP]
dc.identifier.arxiv0901.2770
bordeaux.journalAstronomy and Astrophysics - A&A
bordeaux.page669-675
bordeaux.volume496
bordeaux.issue3
bordeaux.peerReviewedoui
hal.identifierhal-00401202
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00401202v1
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