Spectacular tails of ionized gas in the Virgo cluster galaxy NGC 4569

被引：100

作者：

Boselli, A. ^{[1
]}

Cuillandre, J. C. ^{[2
]}

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

Boissier, S. ^{[1
]}

Bomans, D. ^{[5
]}

Consolandi, G. ^{[6
]}

Anselmi, G. ^{[7
]}

Cortese, L. ^{[8
]}

Cote, P. ^{[9
]}

Durrell, P. ^{[10
]}

Ferrarese, L. ^{[9
]}

Fumagalli, M. ^{[11
,12
]}

Gavazzi, G. ^{[6
]}

Gwyn, S. ^{[9
]}

Hensler, G. ^{[13
,14
]}

Sun, M. ^{[15
]}

Toloba, E. ^{[16
,17
]}

机构：

[1] Aix Marseille Univ, CNRS, LAM, UMR 7326, F-13388 Marseille, France

[2] Univ Paris Diderot, Observ Paris,PSL Res Univ, Lab AIM Paris Saclay,CNRS,INSU, CEA,IRFU,SAP, F-91191 Gif Sur Yvette, France

[3] Univ Sternwarte Munchen, Scheinerstr 1, D-81679 Munich, Germany

[4] Max Planck Inst Extraterr Phys, Giessenbachstr, D-85748 Garching, Germany

[5] Ruhr Univ Bochum, Astron Inst, Univ Str 150, D-44801 Bochum, Germany

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

[7] Coelum Astron, Via Appia 20, I-30173 Venice, Italy

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

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

[10] Youngstown State Univ, Dept Physiscs & Astron, Youngstown, OH 44503 USA

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

[12] Univ Durham, Dept Phys, Ctr Extragalact Astron, S Rd, Durham DH1 3LE, England

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

[14] Natl Astron Observ Japan, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan

[15] Univ Alabama, Dept Phys, Huntsville, AL 35899 USA

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

[17] Texas Tech Univ, Dept Phys, POB 41051, Lubbock, TX 79409 USA

来源：

ASTRONOMY & ASTROPHYSICS | 2016年 / 587卷

基金：

澳大利亚研究理事会; 英国科学技术设施理事会;

关键词：

galaxies: individual: NGC 4569; galaxies: clusters: general; galaxies: clusters: individual: Virgo; galaxies: evolution; galaxies: interactions; galaxies: ISM; HERSCHEL REFERENCE SURVEY; STAR-FORMATION PROPERTIES; DIGITAL-SKY-SURVEY; MORPHOLOGY-DENSITY RELATION; PRESSURE STRIPPING EVENTS; ALPHA SURFACE PHOTOMETRY; HUBBLE-SPACE-TELESCOPE; BAND-SELECTED SAMPLE; H-ALPHA; NEARBY GALAXIES;

D O I：

10.1051/0004-6361/201527795

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Using MegaCam at the CFHT, we obtained a deep narrow band H alpha+[NII] wide-field image of NGC 4569 (M90), the brightest late-type galaxy in the Virgo cluster. The image reveals the presence of long tails of diffuse ionized gas, without any associated stellar component extending from the disc of the galaxy up to similar or equal to 80 kpc (projected distance) and with a typical surface brightness of a few 10(-18) erg s(-1) cm(-2) arcsec(-2). These features provide direct evidence that NGC 4569 is undergoing a ram-presure stripping event. The image also shows a prominent 8 kpc spur of ionized gas that is associated with the nucleus that spectroscopic data identify as an outflow. With some assumptions on the 3D distribution of the gas, we use the Ha surface brightness of these extended low-surface brightness features to derive the density and the mass of the gas that has been stripped during the interaction of the galaxy with the intracluster medium. The comparison with ad hoc chemo-spectrophotometric models of galaxy evolution indicates that the mass of the Ha emitting gas in the tail is a large fraction of that of the cold phase that has been stripped from the disc, suggesting that the gas is ionized within the tail during the stripping process. The lack of star-forming regions suggests that mechanisms other than photoionization are responsible for the excitation of the gas (shocks, heat conduction, magneto hydrodynamic waves). This analysis indicates that ram pressure stripping is efficient in massive (M-star similar or equal to 10(10.5) M-circle dot) galaxies located in intermediate-mass (similar or equal to 10(14) M-circle dot) clusters under formation. It also shows that the mass of gas expelled by the nuclear outflow is only similar to 1% than that removed during the ram pressure stripping event. Together these results indicate that ram pressure stripping, rather than starvation through nuclear feedback, can be the dominant mechanism that is responsible for the quenching of the star formation activity of galaxies in high density environments.

引用

页数：17

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