A MULTIWAVELENGTH STUDY OF TADPOLE GALAXIES IN THE HUBBLE ULTRA DEEP FIELD

被引：10

作者：

Straughn, Amber N. ^{[1
]}

Voyer, Elysse N. ^{[2
]}

Eufrasio, Rafael T. ^{[1
,3
]}

de Mello, Duilia ^{[4
]}

Petty, Sara ^{[5
]}

Kassin, Susan ^{[6
]}

Gardner, Jonathan P. ^{[1
]}

Ravindranath, Swara ^{[6
]}

Soto, Emmaris ^{[4
]}

机构：

[1] Goddard Space Flight Ctr, Astrophys Sci Div, Greenbelt, MD 20771 USA

[2] Google, Randstad, Palo Alto, CA USA

[3] Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA

[4] Catholic Univ Amer, Dept Phys, Washington, DC 20064 USA

[5] Virginia Tech, Dept Phys, Blacksburg, VA 24061 USA

[6] Space Telescope Sci Inst, Baltimore, MD 21218 USA

来源：

ASTROPHYSICAL JOURNAL | 2015年 / 814卷 / 02期

关键词：

galaxies: evolution; galaxies: general; galaxies: irregular; STAR-FORMING GALAXIES; EXTRAGALACTIC LEGACY SURVEY; LYMAN-BREAK GALAXIES; FORMATION HISTORY; GOODS-SOUTH; CANDELS; MORPHOLOGIES; EVOLUTION; RELEASE;

D O I：

10.1088/0004-637X/814/2/97

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Multiwavelength data are essential in order to provide a complete picture of galaxy evolution and to inform studies of galaxies' morphological properties across cosmic time. Here we present the results of a multiwavelength investigation of the morphologies of "tadpole" galaxies at intermediate redshift (0.314 < z < 3.175) in the Hubble Ultra Deep Field. These galaxies were previously selected from deep Hubble Space Telescope (HST) F775W data based on their distinct asymmetric knot-plus-tail morphologies. Here we use deep Wide Field Camera 3 near-infrared imaging in addition to the HST optical data in order to study the rest-frame UV/optical morphologies of these galaxies across the redshift range 0.3 < z < 3.2. This study reveals that the majority of these galaxies do retain their general asymmetric morphology in the rest-frame optical over this redshift range, if not the distinct "tadpole" shape. The average stellar mass of tadpole galaxies is lower than that of field galaxies, with the effect being slightly greater at higher redshift within the errors. Estimated from spectral energy distribution fits, the average age of tadpole galaxies is younger than that of field galaxies in the lower-redshift bin, and the average metallicity is lower (whereas the specific star formation rate for tadpoles is roughly the same as field galaxies across the redshift range probed here). These average effects combined support the conclusion that this subset of galaxies is in an active phase of assembly, either late-stage merging or cold gas accretion causing localized clumpy star formation.

引用

页数：8

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