A Virgo Environmental Survey Tracing Ionised Gas Emission (VESTIGE) IV. A tail of ionised gas in the merger remnant NGC4424

被引：30

作者：

Boselli, A. ^{[1
]}

Fossati, M. ^{[2
,3
,4
]}

Consolandi, G. ^{[5
]}

Amram, P. ^{[1
]}

Ge, C. ^{[6
]}

Sun, M. ^{[6
]}

Anderson, J. P. ^{[7
]}

Boissier, S. ^{[1
]}

Boquien, M. ^{[8
]}

Buat, V. ^{[1
]}

Burgarella, D. ^{[1
]}

Cortese, L. ^{[9
,10
]}

Cote, P. ^{[11
]}

Cuillandre, J. C. ^{[12
]}

Durrell, P. ^{[13
]}

Epinat, B. ^{[1
]}

Ferrarese, L. ^{[11
]}

Fumagalli, M. ^{[3
,4
]}

Galbany, L. ^{[14
]}

Gavazzi, G. ^{[5
]}

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

Gwyn, S. ^{[11
]}

Hensler, G. ^{[15
]}

Kuncarayakti, H. ^{[16
,17
]}

Marcelin, M. ^{[1
]}

Mendes de Oliveira, C. ^{[18
]}

Quint, B. C. ^{[19
]}

Roediger, J. ^{[11
]}

Roehlly, Y. ^{[20
]}

Sanchez, S. F. ^{[21
]}

Sanchez-Janssen, R. ^{[22
]}

Toloba, E. ^{[23
,24
]}

Trinchieri, G. ^{[25
]}

Vollmer, B. ^{[26
]}

机构：

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

[2] Max Planck Inst Extraterr Phys, Giessenbach Str, D-85748 Garching, Germany

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

[4] Univ Durham, Ctr Extragalact Astron, Dept Phys, Durham DH1 3LE, England

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

[6] Univ Alabama, Dept Phys & Astron, Huntsville, AL 35899 USA

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

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

[9] Univ Western Australia, Int Ctr Radio Astron Res, 35 Stirling Highwy, Crawley, WA 6009, Australia

[10] ARC Ctr Excellence All Sky Astrophys 3 Dimens AST, Sydney, NSW, Australia

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

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

[13] Youngstown State Univ, Dept Phys & Astron, Youngstown, OH 44555 USA

[14] Univ Pittsburgh, Dept Phys & Astron, PITT PACC, Pittsburgh, PA 15260 USA

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

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

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

[18] Geofis & Ciencias Atmosfer Univ Sao Paul, Inst Astron, Cidade Univ, BR-05508900 Sao Paulo, SP, Brazil

[19] SOAR Telescope, Cerro Tololo Interamer Observ, Casilla 603, La Serena, Chile

[20] Univ Lyon1, CNRS, UMR5574, Ctr Rech Astrophys Lyon,ENS Lyon, F-69230 St Genis Laval, France

[21] Univ Nacl Autonoma Mexico, Inst Astron, Circuito Exterior, Ciudad Univ, Mexico City 04510, DF, Mexico

[22] Royal Observ Edinburgh, UK Astron Technol Ctr, Blackford Hill, Edinburgh EH9 3HJ, Midlothian, Scotland

[23] Univ Calif Santa Cruz, UCO Lick Observ, 1156 High St, Santa Cruz, CA 95064 USA

[24] Texas Tech Univ, Phys Dept, Box 41051, Lubbock, TX 79409 USA

[25] INAF Osservatorio Astronom Brera, Via Brera 28, I-20121 Milan, Italy

[26] Observ Astronom Strasbourg, UMR 7750, 11 Rue l Univ, F-67000 Strasbourg, France

来源：

ASTRONOMY & ASTROPHYSICS | 2018年 / 620卷

基金：

欧洲研究理事会; 英国科学技术设施理事会;

关键词：

galaxies: individual: NGC4424; galaxies: clusters: general; galaxies: clusters: individual: Virgo; galaxies: evolution; galaxies: interactions; galaxies: ISM; STELLAR POPULATION SYNTHESIS; PRESSURE STRIPPING EVENTS; ALPHA KINEMATIC SURVEY; STAR-FORMATION; SPIRAL GALAXIES; HI OBSERVATIONS; IRREGULAR GALAXIES; DISK GALAXIES; SURFACE PHOTOMETRY; RICH CLUSTERS;

D O I：

10.1051/0004-6361/201833914

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We observed the late-type peculiar galaxy NGC4424 during the Virgo Environmental Survey Tracing Galaxy Evolution (VESTIGE), a blind narrow-band H alpha+ [NII] imaging survey of the Virgo cluster carried out with MegaCam at the Canada-French-Hawaii Telescope (CFHT). The presence of a similar to 110 kpc (in projected distance) HI tail in the southern direction indicates that this galaxy is undergoing a ram pressure stripping event. The deep narrow-band image revealed a low surface brightness (Sigma(H alpha) similar or equal to 4 x 10(-18) erg s(-1) cm(-2) arcsec(-2)) ionised gas tail similar to 10 kpc in length extending from the centre of the galaxy to the north-west, thus in the direction opposite to the HI tail. Chandra and XMM X-rays data do not show a compact source in the nucleus or an extended tail of hot gas, while IFU spectroscopy (MUSE) indicates that the gas is photo-ionised in the inner regions and shock-ionised in the outer parts. Medium-resolution (MUSE) (MUSE) indicates that the gas is photo-ionised in the inner regions and shock-ionised in the outer parts. Medium-resolution (MUSE) and high-resolution (Fabry-Perot) IFU spectroscopy confirms that the ionised gas is kinematically decoupled from the stellar component and indicates the presence of two kinematically distinct structures in the stellar disc. The analysis of the SED of the galaxy indicates that the activity of star formation was totally quenched in the outer disc similar to 250-280 Myr ago, while only reduced by similar to 80% in the central regions. All this observational evidence suggests that NGC4424 is the remnant of an unequal-mass merger that occurred less than or similar to 500 Myr ago when the galaxy was already a member of the Virgo cluster, and is now undergoing a ram pressure stripping event that has removed the gas and quenched the activity of star formation in the outer disc. The tail of ionised gas probably results from the outflow produced by a central starburst fed by the collapse of gas induced by the merging episode. This outflow is sufficiently powerful to overcome the ram pressure induced by the intracluster medium on the disc of the galaxy crossing the cluster. This analysis thus suggests that feedback can participate in the quenching process of galaxies in high-density regions.

引用

页数：16

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