GASP - XVII. Hi imaging of the jellyfish galaxy JO206: gas stripping and enhanced star formation

被引：59
|
作者：
Ramatsoku, M. [1 ]
Serra, P. [1 ]
Poggianti, B. M. [2 ]
Moretti, A. [2 ]
Gullieuszik, M. [2 ]
Bettoni, D. [2 ]
Deb, T. [3 ]
Fritz, J. [4 ]
van Gorkom, J. H. [5 ]
Jaffe, Y. L. [6 ]
Tonnesen, S. [7 ]
Verheijen, M. A. W. [3 ,8 ]
Vulcani, B. [2 ]
Hugo, B. [9 ,10 ]
Jozsa, G. I. G. [9 ,10 ,11 ]
Maccagni, F. M. [1 ]
Makhathini, S. [9 ,10 ]
Ramaila, A. [9 ,10 ]
Smirnov, O. [9 ,10 ]
Thorat, K. [9 ,10 ]
机构：
[1] INAF, Osservatorio Astron Cagliari, Via Sci 5, I-09047 Selargius, CA, Italy
[2] INAF, Osservatorio Astron Padova, Vicolo Osservatorio 5, I-35122 Padua, Italy
[3] Univ Groningen, Kapteyn Astron Inst, Landleven 12, NL-9747 AV Groningen, Netherlands
[4] Univ Nacl Autonoma Mexico, Inst Radioastron & Astrofis, Campus Morelia,AP 3-72, Mexico City 58089, DF, Mexico
[5] Columbia Univ, Dept Astron, Mail Code 5246,550 W 120th St, New York, NY 10027 USA
[6] Univ Valparaiso, Fac Ciencias, Inst Fis & Astron, Avda Gran Bretana 1111, Valparaiso, Chile
[7] Flatiron Inst, Ctr Computat Astrophys, 162 5th Ave, New York, NY 10010 USA
[8] Tata Inst Fundamental Res, Natl Ctr Radio Astrophys, Postbag 3, Pune 411007, Maharashtra, India
[9] South African Radio Astron Observ, 2 Fir St,Black River Pk, ZA-7925 Observatory, South Africa
[10] Rhodes Univ, Dept Phys & Elect, ZA-6139 Makhanda, South Africa
[11] Argelander Inst Astron, Hugel 71, D-53121 Bonn, Germany
来源：
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2019年 / 487卷 / 04期
基金：
欧洲研究理事会;
关键词：
galaxies: clusters: intracluster medium; MORPHOLOGY-DENSITY RELATION; ARECIBO SDSS SURVEY; RAM-PRESSURE; IRREGULAR GALAXIES; SPIRAL GALAXIES; DISC GALAXIES; VIRGO CLUSTER; ATOMIC GAS; FORMATION EFFICIENCY; PHYSICAL-PROPERTIES;
D O I：
10.1093/mnras/stz1609
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We present VLA Hi observations of JO206, a prototypical ram-pressure-stripped galaxy in the GASP sample. This massive galaxy (M-*= 8.5x10(10) M-circle dot) is located at a redshift of z= 0.0513, near the centre of the low-mass galaxy cluster, IIZw108 (sigma similar to 575kms(-1)). JO206 is characterized by a long tail (>= 90kpc) of ionized gas stripped away by ram pressure. We find a similarly long Hi tail in the same direction as the ionized gas tail and measure a total Hi mass of 3.2x10(9) M-circle dot. This is about half the expected Hi mass given the stellar mass and surface density of JO206. A total of 1.8x10(9) M-circle dot (60percent) of the detected Hi is in the gas-stripped tail. An analysis of the star formation rate shows that the galaxy is forming more stars compared to galaxies with the same stellar and Hi mass. On average we find an Hi gas depletion time of similar to 0.5Gyr which is about four times shorter than that of normal' spiral galaxies. We performed a spatially resolved analysis of the relation between star formation rate density and gas density in the disc and tail of the galaxy at the resolution of our Hi data. The star formation efficiency of the disc is about 10times higher than that of the tail at fixed Hi surface densities. Both the inner and outer parts of JO206 show an enhanced star formation compared to regions of similar Hi surface density in field galaxies. The enhanced star formation is due to ram-pressure stripping during the galaxy's first infall into the cluster.
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收藏
页码：4580 / 4591
页数：12
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