NEAR-ULTRAVIOLET SPECTROSCOPY OF STAR-FORMING GALAXIES FROM eBOSS: SIGNATURES OF UBIQUITOUS GALACTIC-SCALE OUTFLOWS
文献类型：期刊论文
| 作者 | Zhu, Guangtun Ben1; Comparat, Johan2,3; Kneib, Jean-Paul4,5; Delubac, Timothee4; Raichoor, Anand6; Dawson, Kyle S.7; Newman, Jeffrey8; Yeche, Christophe6; Zhou, Xu9 ; Schneider, Donald P.10,11
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| 刊名 | ASTROPHYSICAL JOURNAL
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| 出版日期 | 2015-12-10 |
| 卷号 | 815期号:1 |
| 关键词 | galaxies: evolution galaxies: ISM intergalactic medium quasars: absorption lines surveys ultraviolet: galaxies |
| 英文摘要 | We present rest-frame near-ultraviolet (NUV) spectroscopy of star-forming galaxies (SFGs) at 0.6 < z < 1.2 from the Extended Baryon Oscillation Spectroscopic Survey (eBOSS) in SDSS-IV. One of the eBOSS programs is to obtain 2 ''. (about 15 kpc) fiber spectra of about 200,000 emission-line galaxies (ELGs) at redshift z greater than or similar to 0.6. We use the data from the pilot observations of this program, including 8620 spectra of SFGs at 0.6 < z < 1.2. The median composite spectra of these SFGs at 2200 angstrom < lambda < 4000 angstrom feature asymmetric, preferentially blueshifted non-resonant emission, Fe II*, and blueshifted resonant absorption, e.g., Fe II and Mg II, indicating ubiquitous outflows driven by star formation at these redshifts. For the absorption lines, we find a variety of velocity profiles with different degrees of blueshift. Comparing our new observations with the literature, we do not observe the non-resonant emission in the small-aperture (< 40 pc) spectra of local star-forming regions with the Hubble Space Telescope, and find the observed line ratios in the SFG spectra to be different from those in the spectra of local star-forming regions, as well as those of quasar absorption-line systems in the same redshift range. We introduce an outflow model that can simultaneously explain the multiple observed properties and suggest that the variety of absorption velocity profiles and the line ratio differences are caused by scattered fluorescent emission filling in on top of the absorption in the large-aperture eBOSS spectra. We develop an observation-driven, model-independent method to correct the emission infill to reveal the true absorption profiles. Finally, we show that the strengths of both the non-resonant emission and the emission-corrected resonant absorption increase with [O II] lambda lambda 3727, 3730 rest equivalent width and luminosity, with a slightly larger dependence on the former. Our results show that the eBOSS and future dark-energy surveys (e.g., Dark Energy Spectroscopic Instrument survey and Prime Focus Spectrograph survey) will provide rich data sets of rest-frame NUV spectroscopy for astrophysical applications. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000367105000048 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/5505]  |
| 专题 | 国家天文台_光学天文研究部 |
| 作者单位 | 1.Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA 2.Univ Autonoma Madrid, CSIC, Inst Fis Teor, E-28049 Madrid, Spain 3.Univ Autonoma Madrid, Dept Fis Teor, E-28049 Madrid, Spain 4.Ecole Polytech Fed Lausanne, Observ Sauverny, Astrophys Lab, CH-1290 Versoix, Switzerland 5.Aix Marseille Univ, CNRS, LAM, UMR 7326, F-13388 Marseille, France 6.CEA, Ctr Saclay, Irfu SPP, F-91191 Gif Sur Yvette, France 7.Univ Utah, Dept Phys & Astron, Salt Lake City, UT 84112 USA 8.Univ Pittsburgh, Dept Phys & Astron, PITT PACC, Pittsburgh, PA 15260 USA 9.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China 10.Penn State Univ, Dept Astron & Astrophys, University Pk, PA 16802 USA |
| 推荐引用方式 GB/T 7714 | Zhu, Guangtun Ben,Comparat, Johan,Kneib, Jean-Paul,et al. NEAR-ULTRAVIOLET SPECTROSCOPY OF STAR-FORMING GALAXIES FROM eBOSS: SIGNATURES OF UBIQUITOUS GALACTIC-SCALE OUTFLOWS[J]. ASTROPHYSICAL JOURNAL,2015,815(1). |
| APA | Zhu, Guangtun Ben.,Comparat, Johan.,Kneib, Jean-Paul.,Delubac, Timothee.,Raichoor, Anand.,...&Schneider, Donald P..(2015).NEAR-ULTRAVIOLET SPECTROSCOPY OF STAR-FORMING GALAXIES FROM eBOSS: SIGNATURES OF UBIQUITOUS GALACTIC-SCALE OUTFLOWS.ASTROPHYSICAL JOURNAL,815(1). |
| MLA | Zhu, Guangtun Ben,et al."NEAR-ULTRAVIOLET SPECTROSCOPY OF STAR-FORMING GALAXIES FROM eBOSS: SIGNATURES OF UBIQUITOUS GALACTIC-SCALE OUTFLOWS".ASTROPHYSICAL JOURNAL 815.1(2015). |
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来源：国家天文台
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