A Virgo Environmental Survey Tracing Ionised Gas Emission (VESTIGE). XI. Two-dimensional Hα kinematics of the edge-on ram pressure stripped galaxy NGC 4330
- Autor(en)
- M. M. Sardaneta, P. Amram, A. Boselli, B. Vollmer, M. Rosado, M. Sánchez-Cruces, A. Longobardi, C. Adami, M. Fossati, B. Epinat, M. Boquien, P. Côté, G. Hensler, Junais, H. Plana, J. C. Cuillandre, L. Ferrarese, J. L. Gach, J. A. Gomez-Lopez, S. Gwyn, G. Trinchieri
- Abstrakt
Using the VESTIGE survey, a deep narrow-band Hα imaging survey of the Virgo cluster carried out at the CFHT with MegaCam, we discovered a long and diffuse tail of ionised gas in the edge-on late-type galaxy NGC 4330. This peculiar feature indicates an ongoing ram pressure stripping event able to remove the gas in the outer region of the disc. Tuned hydrodynamic simulations suggest that the ram pressure stripping event is occurring almost face-on, making NGC 4330 the ideal candidate for studying the effects of the perturbation in the direction perpendicular to the disc plane. We present here two new independent sets of Fabry-Perot observations (R ≃ 10 000) with the purpose of understanding the effects of the ram pressure stripping process on the kinematics of the ionised gas. Despite their limited sensitivity to the diffuse gas emission, the data allowed us to measure the velocity and the velocity dispersion fields over the galaxy disc and in several features at the edges or outside the stellar disc formed after the ram pressure stripping event. We constructed the position-velocity diagrams and the rotation curves of the galaxy using three different techniques. The data show, consistent with the hydrodynamic simulations, that the galaxy has an inner solid-body rotation up to ∼2.4 kpc, with non-circular streaming motions outside this radius and in the several external features formed during the interaction of the galaxy with the surrounding intracluster medium. The data also indicate a decrease in the rotational velocity of the gas with increasing distance from the galaxy disc along the tails, suggesting a gradual but not linear loss of angular momentum in the stripped gas. Consistent with a ram pressure stripping scenario, the i-band image shows a boxy shape at the south-west edge of the disc, where the stellar orbits might have been perturbed by the modification of the gravitational potential well of the galaxy due to the displacement of the gas in the z direction.
Reduced datacubes are also available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (ftp://130.79.128.5) or via cdsarc.u-strasbg.fr/viz-bin/cat/J/A+A/659/A45 Based on observations obtained: (1) at the Observatoire de Haute Provence (OHP; France), operated by the French Centre National de la Recherche Scientifique (CNRS); (2) at the Observatorio Astronómico Nacional in San Pedro Mártir, Baja California, Mexico (OAN-SPM); and with (3) MegaPrime/MegaCam, a joint project of CEA/DAPNIA and the Canada-French-Hawaii Telescope (CFHT), which is operated by the National Research Council (NRC) of Canada, the Institut National des Sciences de l'Univers of the CNRS of France, and the University of Hawaii.- Organisation(en)
- Institut für Astrophysik
- Externe Organisation(en)
- Aix-Marseille Université, Université de Strasbourg, Universidad Nacional Autonoma de Mexico, Università degli Studi di Milano-Bicocca, Universidad de Antofagasta, National Research Council Canada (NRC-CNRC), Universidade Estadual de Santa Cruz, Université Paris Saclay, INAF Osservatorio Astronomico di Brera
- Journal
- Astronomy and Astrophysics
- Band
- 2022
- Anzahl der Seiten
- 27
- ISSN
- 0004-6361
- DOI
- https://doi.org/10.1051/0004-6361/202142270
- Publikationsdatum
- 03-2022
- Peer-reviewed
- Ja
- ÖFOS 2012
- 103003 Astronomie, 103004 Astrophysik
- Schlagwörter
- ASJC Scopus Sachgebiete
- Astronomy and Astrophysics, Space and Planetary Science
- Link zum Portal
- https://ucrisportal.univie.ac.at/de/publications/4386a025-eb52-41b5-8f8d-65c37aba29c7