MULTI-WAVELENGTH STUDIES OF SPECTACULAR RAM-PRESSURE STRIPPING OF A GALAXY. II. STAR FORMATION IN THE TAIL

被引：27

作者：

Yagi, Masafumi ^{[1
]}

Gu, Liyi ^{[2
,3
]}

Fujita, Yutaka ^{[4
]}

Nakazawa, Kazuhiro ^{[2
]}

Akahori, Takuya ^{[5
]}

Hattori, Takashi ^{[6
]}

Yoshida, Michitoshi ^{[7
]}

Makishima, Kazuo ^{[2
,3
,8
]}

机构：

[1] Natl Astron Observ Japan, Opt & Infrared Astron Div, Mitaka, Tokyo 1818588, Japan

[2] Univ Tokyo, Dept Phys, Bunkyo Ku, Tokyo 1130011, Japan

[3] Univ Tokyo, Sch Sci, Res Ctr Early Universe, Bunkyo Ku, Tokyo 1130011, Japan

[4] Osaka Univ, Grad Sch Sci, Dept Earth & Space Sci, Toyonaka, Osaka 5600043, Japan

[5] Univ Sydney, Sch Phys, Sydney Inst Astron, Redfern, NSW 2006, Australia

[6] Subaru Telescope, Hilo, HI 96720 USA

[7] Hiroshima Univ, Hiroshima Astrophys Sci Ctr, Hiroshima 7398526, Japan

[8] Inst Phys & Chem Res, MAXI Team, Wako, Saitama 3510198, Japan

来源：

ASTROPHYSICAL JOURNAL | 2013年 / 778卷 / 02期

关键词：

galaxies: individual (NGC 4388); H II regions; intergalactic medium; INTRACLUSTER PLANETARY-NEBULAE; EMISSION-LINE REGION; DIGITAL SKY SURVEY; VIRGO CLUSTER; SPIRAL GALAXIES; DATA RELEASE; IONIZED-GAS; SUPRIME-CAM; H-ALPHA; LUMINOSITY FUNCTION;

D O I：

10.1088/0004-637X/778/2/91

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

With multiband photometric data in public archives, we detected four intracluster star-forming regions in the Virgo Cluster. Two of them were at a projected distance of 35 kpc from NGC 4388 and the other two were 66 kpc away. Our new spectroscopic observations revealed that their recessional velocities were comparable to the ram-pressures-tripped tail of NGC 4388 and confirmed the association. The stellar mass of the star-forming regions ranged from 10(4) to 10(4.5)M(circle dot). except for that of the faintest one, which was <10(3) M-circle dot. The metallicity was comparable to a solar abundance and the age of the stars was similar to 10(6.8) yr. Their young stellar age meant that the star formation should have started after the gas was stripped from NGC 4388. This implied in situ condensation of the stripped gas. We also found that two star-forming regions were located near the leading edge of a filamentary dark cloud. The extinction of the filament was smaller than that derived from the Balmer decrement of the star-forming regions, implying that the dust in the filament would be locally dense around the star-forming regions.

引用

页数：17

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