DUST EMISSION AND STAR FORMATION IN STEPHAN'S QUINTET
文献类型：期刊论文
| 作者 | Natale, G.1; Tuffs, R. J.1; Xu, C. K.2; Popescu, C. C.3; Fischera, J.4; Lisenfeld, U.5; Lu, N.2; Appleton, P.6; Dopita, M.7; Duc, P. -A.8 |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2010-12-01 |
| 卷号 | 725期号:1页码:955-984 |
| 关键词 | dust, extinction galaxies: groups: individual (HGC92) galaxies: interactions galaxies: star formation infrared: general intergalactic medium |
| ISSN号 | 0004-637X |
| 英文摘要 | We analyze a comprehensive set of MIR/FIR observations of Stephan's Quintet (SQ), taken with the Spitzer Space Telescope. Our study reveals the presence of a luminous (L-IR approximate to 4.6x10(43) erg s(-1)) and extended component of infrared dust emission, not connected with the main bodies of the galaxies, but roughly coincident with the X-ray halo of the group. We fitted the inferred dust emission spectral energy distribution of this extended source and the other main infrared emission components of SQ, including the intergalactic shock, to elucidate the mechanisms powering the dust and polycyclic aromatic hydrocarbon emission, taking into account collisional heating by the plasma and heating through UV and optical photons. Combining the inferred direct and dust-processed UV emission to estimate the star formation rate (SFR) for each source we obtain a total SFR for SQ of 7.5 M-circle dot yr(-1), similar to that expected for non-interacting galaxies with stellar mass comparable to the SQ galaxies. Although star formation in SQ is mainly occurring at, or external to the periphery of the galaxies, the relation of SFR per unit physical area to gas column density for the brightest sources is similar to that seen for star formation regions in galactic disks. We also show that available sources of dust in the group halo can provide enough dust to produce up to L-IR approximate to 10(42) erg s(-1) powered by collisional heating. Though a minority of the total infrared emission (which we infer to trace distributed star-formation), this is several times higher than the X-ray luminosity of the halo, so could indicate an important cooling mechanism for the hot intergalactic medium (IGM) and account for the overall correspondence between FIR and X-ray emission. We investigate two potential modes of star formation in SQ consistent with the data, fueled either by gas from a virialized hot IGM continuously accreting onto the group, whose cooling is enhanced by grains injected from an in situ population of intermediate mass stars, or by interstellar gas stripped from the galaxies. The former mode offers a natural explanation for the observed baryon deficiency in the IGM of SQ as well as for the steep L-X-T-X relation of groups such as SQ with lower velocity dispersions. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 学科主题 | Astronomy & Astrophysics |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | SPECTRAL ENERGY-DISTRIBUTION ; ABUNDANT MOLECULAR GAS ; FAR-INFRARED EMISSION ; INTRACLUSTER DUST ; INTERSTELLAR GRAINS ; COMA CLUSTER ; INTERGALACTIC MEDIUM ; STARBURST GALAXIES ; INTRAGROUP MEDIUM ; FORMING GALAXIES |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000284576700102 |
| 公开日期 | 2011-11-23 |
| 源URL | [http://159.226.72.40/handle/332002/1113]  |
| 专题 | 紫金山天文台_星系中的恒星形成研究团组 |
| 作者单位 | 1.Max Planck Inst Kernphys, D-69117 Heidelberg, Germany 2.CALTECH, Infrared Proc & Anal Ctr, Pasadena, CA 91125 USA 3.Univ Cent Lancashire, Preston PR1 2HE, Lancs, England 4.Univ Toronto, Canadian Inst Theoret Astrophys, Toronto, ON M5S 3H8, Canada 5.Univ Granada, Dept Fis Teor & Cosmos, Granada, Spain 6.CALTECH, NASA, Herschel Sci Ctr, IPAC, Pasadena, CA 91125 USA 7.Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia 8.Univ Paris Diderot, Lab AIM, CEA DSM CNRS, CEA Saclay,Dapnia Serv Astrophys, F-91191 Gif Sur Yvette, France 9.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China 10.CALTECH, Spitzer Sci Ctr, IPAC, Pasadena, CA 91125 USA |
| 推荐引用方式 GB/T 7714 | Natale, G.,Tuffs, R. J.,Xu, C. K.,et al. DUST EMISSION AND STAR FORMATION IN STEPHAN'S QUINTET[J]. ASTROPHYSICAL JOURNAL,2010,725(1):955-984. |
| APA | Natale, G..,Tuffs, R. J..,Xu, C. K..,Popescu, C. C..,Fischera, J..,...&Yun, M..(2010).DUST EMISSION AND STAR FORMATION IN STEPHAN'S QUINTET.ASTROPHYSICAL JOURNAL,725(1),955-984. |
| MLA | Natale, G.,et al."DUST EMISSION AND STAR FORMATION IN STEPHAN'S QUINTET".ASTROPHYSICAL JOURNAL 725.1(2010):955-984. |
入库方式： OAI收割
来源：紫金山天文台
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