A Virgo Environmental Survey Tracing Ionised Gas Emission (VESTIGE) XI. Two-dimensional Hα kinematics of the edge-on ram pressure stripped galaxy NGC 4330

被引：7

作者：

Sardaneta, M. M. ^{[1
]}

Amram, P. ^{[1
]}

Boselli, A. ^{[1
]}

Vollmer, B. ^{[2
]}

Rosado, M. ^{[3
]}

Sanchez-Cruces, M. ^{[1
,3
]}

Longobardi, A. ^{[4
]}

Adami, C. ^{[1
]}

Fossati, M. ^{[4
]}

Epinat, B. ^{[1
]}

Boquien, M. ^{[5
]}

Cote, P. ^{[6
]}

Hensler, G. ^{[7
]}

Junais ^{[1
]}

Plana, H. ^{[8
]}

Cuillandre, J. C. ^{[9
]}

Ferrarese, L. ^{[6
]}

Gach, J. L. ^{[1
]}

Gomez-Lopez, J. A. ^{[1
]}

Gwyn, S. ^{[6
]}

Trinchieri, G. ^{[10
]}

机构：

[1] Aix Marseille Univ, LAM, CNES, CNRS, Marseille, France

[2] Univ Strasbourg, CNRS, Observ Astron Strasbourg, UMR 7550, F-67000 Strasbourg, France

[3] Univ Nacl Autonoma Mexico, Inst Astron, Apartado Postal 70-264, Mexico City 04510, DF, Mexico

[4] Univ Milano Bicocca, Piazza Sci 3, I-20100 Milan, Italy

[5] Univ Antofagasta, Ctr Astron CITEVA, Ave Angamos 601, Antofagasta, Chile

[6] Natl Res Council Canada, Herzberg Astron & Astrophys, 5071 West Saanich Rd, Victoria, BC V9E 2E7, Canada

[7] Univ Vienna, Dept Astrophys, Turkenschanzstr 17, A-1180 Vienna, Austria

[8] Univ Estadual Santa Cruz, Lab Astrofis Teor & Observac, BR-45650000 Ilheus, BA, Brazil

[9] Univ Paris Saclay, Observ Paris, Univ Paris Diderot, PSL Univ,AIM,CEA,CNRS,Sorbonne Paris Cite, F-91191 Gif Sur Yvette, France

[10] INAF Osservatorio Astron Brera, Via Brera 28, I-20159 Milan, Italy

来源：

ASTRONOMY & ASTROPHYSICS | 2022年 / 659卷

基金：

欧洲研究理事会;

关键词：

galaxies: clusters: general; galaxies: clusters: individual: Virgo; galaxies: evolution; galaxies: interactions; galaxies: kinematics and dynamics; FABRY-PEROT OBSERVATIONS; STAR-FORMATION; ROTATION CURVES; NEUTRAL HYDROGEN; SPIRAL GALAXIES; MOLECULAR GAS; SURFACE PHOTOMETRY; IRREGULAR GALAXIES; CLUSTER SURVEY; DISK GALAXIES;

D O I：

10.1051/0004-6361/202142270

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Using the VESTIGE survey, a deep narrow-band Ha 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 similar or equal to 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 similar to 2.4 kpc, with noncircular 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.

引用

页数：27

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