A Virgo Environmental Survey Tracing Ionised Gas Emission (VESTIGE): IX. The effects of ram pressure stripping down to the scale of individual HII regions in the dwarf galaxy IC 3476 *.**

被引：42

作者：

Boselli, A. ^{[1
]}

Lupi, A. ^{[2
]}

Epinat, B. ^{[1
]}

Amram, P. ^{[1
]}

Fossati, M. ^{[3
,4
,5
]}

Anderson, J. P. ^{[6
]}

Boissier, S. ^{[1
]}

Boquien, M. ^{[7
]}

Consolandi, G. ^{[8
]}

Cote, P. ^{[9
]}

Cuillandre, J. C. ^{[10
]}

Ferrarese, L. ^{[9
]}

Galbany, L. ^{[11
]}

Gavazzi, G. ^{[3
]}

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

Gwyn, S. ^{[9
]}

Hensler, G. ^{[12
]}

Hutchings, J. ^{[9
]}

Kuncarayakti, H. ^{[13
,14
]}

Longobardi, A. ^{[1
]}

Peng, E. W. ^{[15
]}

Plana, H. ^{[16
]}

Postma, J. ^{[17
]}

Roediger, J. ^{[9
]}

Roehlly, Y. ^{[1
]}

Schimd, C. ^{[1
]}

Trinchieri, G. ^{[8
]}

Vollmer, B. ^{[18
]}

机构：

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

[2] Scuola Normale Super Pisa, Piazza Cavalieri 7, I-56126 Pisa, Italy

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

[4] Univ Durham, Inst Computat Cosmol, South Rd, Durham DH1 3LE, England

[5] Univ Durham, Ctr Extragalact Astron, Dept Phys, South Rd, Durham DH1 3LE, England

[6] European Southern Observ, Alonso Cordova 3107,Casilla 19, Santiago, Chile

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

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

[9] NRC Herzberg Astron & Astrophys, 5071 West Saanich Rd, Victoria, BC V9E 2E7, Canada

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

[11] Univ Granada, Dept Fis Teor & Cosmos, Granada 18071, Spain

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

[13] Univ Turku, Tuorla Observ, Dept Phys & Astron, Turku 20014, Finland

[14] Univ Turku, Finnish Ctr Astron ESO FINCA, Turku 20014, Finland

[15] Peking Univ, Dept Astron, Beijing 100871, Peoples R China

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

[17] Univ Calgary, 2500 Univ Dr NW, Calgary, AB, Canada

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

来源：

ASTRONOMY & ASTROPHYSICS | 2021年 / 646卷

基金：

欧洲研究理事会; 美国国家航空航天局; 芬兰科学院;

关键词：

galaxies: clusters: general; galaxies: clusters: individual: Virgo; galaxies: evolution; galaxies: interactions; galaxies: ISM; HERSCHEL REFERENCE SURVEY; H II REGIONS; HUBBLE-SPACE-TELESCOPE; FABRY-PEROT OBSERVATIONS; ALPHA KINEMATIC SURVEY; BAND-SELECTED SAMPLE; STAR-FORMATION RATE; SPIRALS NGC 4402; MOLECULAR GAS; CLUSTER SURVEY;

D O I：

10.1051/0004-6361/202039046

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We study the IB(s)m galaxy IC 3476 observed in the context of the Virgo Environmental Survey Tracing Ionised Gas Emission (VESTIGE), a blind narrow-band H alpha+[NII] imaging survey of the Virgo cluster carried out with MegaCam at the CFHT. The deep narrow-band image reveals a very pertubed ionised gas distribution that is characterised by a prominent banana-shaped structure in the front of the galaxy formed of giant HII regions crossing the stellar disc. Star-forming structures, at similar to 8 kpc from the edges of the stellar disc, are also detected in a deep far-ultraviolet ASTROSAT/UVIT image. This particular morphology indicates that the galaxy is undergoing an almost edge-on ram pressure stripping event. The same H alpha+[NII] image also shows that the star formation activity is totally quenched in the leading edge of the disc, where the gas has been removed during the interaction with the surrounding medium. The spectral energy distribution fitting analysis of the multi-frequency data indicates that this quenching episode is very recent (similar to 50 Myr), and roughly corresponds to an increase of the star formation activity by a factor of similar to 161% in the inner regions with respect to that expected for secular evolution. The analysis of these data, whose angular resolution enables the study of the induced effects of the perturbation down to the scale of individual HII regions (r(eq) similar or equal to 40 pc), also suggests that the increase of star formation activity is due to the compression of the gas along the stellar disc of the galaxy, which is able to increase its mean electron density and boost the star formation process producing bright HII regions with luminosities up to L(H alpha) similar or equal to 10(38) erg s(-1). The combined analysis of the VESTIGE data with deep IFU spectroscopy gathered with MUSE and with high spectral resolution Fabry Perot data also indicates that the hydrodynamic interaction has deeply perturbed the velocity field of the ionised gas component while leaving that of the stellar disc unaffected. The comparison of the data with tuned high-resolution hydrodynamic simulations accounting for the different gas phases (atomic, molecular, ionised) consistently indicates that the perturbing event is very recent (50-150 Myr), once again confirming that ram pressure stripping is a violent phenomenon that is able to perturb the evolution of galaxies in rich environments on short timescales.

引用

页数：26

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