Spatially resolved galactic wind in lensed galaxy RCSGA 032727-132609

被引：49

作者：

Bordoloi, Rongmon ^{[1
,2
]}

Rigby, Jane R. ^{[3
]}

Tumlinson, Jason ^{[1
]}

Bayliss, Matthew B. ^{[4
,5
]}

Sharon, Keren ^{[6
]}

Gladders, Michael G. ^{[7
,8
]}

Wuyts, Eva ^{[9
]}

机构：

[1] Space Telescope Sci Inst, 3700 San Martin Dr, Baltimore, MD 21218 USA

[2] MIT, Kavli Ctr Astrophys & Space Res, 77 Massachusetts Ave, Cambridge, MA 02139 USA

[3] NASA, Goddard Space Flight Ctr, Code 665, Greenbelt, MD 20771 USA

[4] Harvard Univ, Dept Phys, 17 Oxford St, Cambridge, MA 02138 USA

[5] Harvard Smithsonian Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA

[6] Univ Michigan, Dept Astron & Astrophys, 500 Church St, Ann Arbor, MI 48109 USA

[7] Univ Chicago, Dept Astron & Astrophys, 5640 South Ellis Ave, Chicago, IL 60637 USA

[8] Univ Chicago, Kavli Inst Cosmol Phys, Chicago, IL 60637 USA

[9] Max Planck Inst Extraterr Phys, Postfach 1312,Giessenbachstr, D-85741 Garching, Germany

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2016年 / 458卷 / 02期

关键词：

galaxies: evolution; galaxies: high-redshift; intergalactic medium; ultraviolet: ISM; STAR-FORMING GALAXIES; SIMILAR-TO; ABSORPTION-LINE PROBES; SINS/ZC-SINF SURVEY; PHYSICAL CONDITIONS; ULTRAVIOLET-SPECTRA; STARBURST GALAXIES; MASSIVE GALAXIES; ZCOSMOS GALAXIES; NEAR-ULTRAVIOLET;

D O I：

10.1093/mnras/stw449

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We probe the spatial distribution of outflowing gas along four lines of sight separated by up to 6 kpc in a gravitationally lensed star-forming galaxy at z = 1.70. Using Mg ii and Fe ii emission and absorption as tracers, we find that the clumps of star formation are driving galactic outflows with velocities of -170 to -250 km s(-1). The velocities of Mg ii emission are redshifted with respect to the systemic velocities of the galaxy, consistent with being back-scattered. By contrast, the Fe ii fluorescent emission lines are either slightly blueshifted or at the systemic velocity of the galaxy. Taken together, the velocity structure of the Mg ii and Fe ii emission is consistent with arising through scattering in galactic winds. Assuming a thin shell geometry for the outflowing gas, the estimated masses carried out by these outflows are large (a parts per thousand(3)30-50 M-aS (TM) yr(- 1)), with mass loading factors several times the star formation rate. Almost 20 per cent to 50 per cent of the blueshifted absorption probably escapes the gravitational potential of the galaxy. In this galaxy, the outflow is 'locally sourced', that is, the properties of the outflow in each line of sight are dominated by the properties of the nearest clump of star formation; the wind is not global to the galaxy. The mass outflow rates and the momentum flux carried out by outflows in individual star-forming knots of this object are comparable to that of starburst galaxies in the local Universe.

引用

页码：1891 / 1908

页数：18

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