DISCOVERY OF AN ULTRA-DIFFUSE GALAXY IN THE PISCES-PERSEUS SUPERCLUSTER
文献类型：期刊论文
| 作者 | Martinez-Delgado, David1,2; Laesker, Ronald2; Sharina, Margarita3; Toloba, Elisa4,5; Fliri, Juergen6,7; Beaton, Rachael5; Valls-Gabaud, David8,18; Karachentsev, Igor D.3; Chonis, Taylor S.9; Grebel, Eva K.1 |
| 刊名 | ASTRONOMICAL JOURNAL
 |
| 出版日期 | 2016-04-01 |
| 卷号 | 151期号:4 |
| 关键词 | galaxies: clusters: general galaxies: evolution galaxies: formation galaxies: photometry |
| 英文摘要 | We report the discovery of DGSAT. I, an ultra-diffuse, quenched galaxy located 10 degrees 4 in projection from the Andromeda galaxy (M31). This low-surface brightness galaxy (mu(V) = 24.8 mag arcsec(-2)), found with a small amateur telescope, appears unresolved in sub-arcsecond archival Subaru/Suprime-Cam images, and hence has been missed by optical surveys relying on resolved star counts, in spite of its relatively large effective radius (R-e(V) = 12") and proximity (15') to the well-known dwarf spheroidal galaxy And II. Its red color (V - I = 1.0), shallow Sersic index (n(V) = 0.68), and the absence of detectable H alpha emission are typical properties of dwarf spheroidal galaxies and suggest that it is mainly composed of old stars. Initially interpreted as an interesting case of an isolated dwarf spheroidal galaxy in the local universe, our radial velocity measurement obtained with the BTA 6 m telescope (V-h = 5450 +/- 40 km s(-1)) shows that this system is an M31-background galaxy associated with the filament of the Pisces-Perseus supercluster. At the distance of this cluster (similar to 78 Mpc), DGSAT. I would have an R-e similar to 4.7 kpc and M-V similar to -16.3. Its properties resemble those of the ultra-diffuse galaxies (UDGs) recently discovered in the Coma cluster. DGSAT. I is the first case of these rare UDGs found in this galaxy cluster. Unlike the UDGs associated with the Coma and Virgo clusters, DGSAT I is found in a much lower density environment, which provides a fresh constraint on the formation mechanisms for this intriguing class of galaxy. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000375609100009 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/5377]  |
| 专题 | 国家天文台_星系宇宙学研究部 |
| 作者单位 | 1.Heidelberg Univ, Zentrum Astron, Astron Rechen Inst, Monchhofstr 12-14, D-69120 Heidelberg, Germany 2.Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany 3.Russian Acad Sci, Special Astrophys Observ, Moscow 117901, Russia 4.Univ Calif Observ, 1156 High St, Santa Cruz, CA 95064 USA 5.Observ Carnegie Inst Sci, 813 Santa Barbara St, Pasadena, CA 91101 USA 6.Inst Astrofis Canarias, Via Lactea S-N, E-38200 San Cristobal la Laguna, Tenerife, Spain 7.Univ La Laguna, Dept Astrofis, E-38206 Tenerife, Spain 8.Observ Paris, CNRS UMR 8112, LERMA, 61 Ave Observ, F-75014 Paris, France 9.Univ Texas Austin, Dept Astron, 2515 Speedway,Stop C1400, Austin, TX 78712 USA 10.Swinburne Univ Technol, Ctr Astrophys & Supercomp, Hawthorn, Vic 3122, Australia |
| 推荐引用方式 GB/T 7714 | Martinez-Delgado, David,Laesker, Ronald,Sharina, Margarita,et al. DISCOVERY OF AN ULTRA-DIFFUSE GALAXY IN THE PISCES-PERSEUS SUPERCLUSTER[J]. ASTRONOMICAL JOURNAL,2016,151(4). |
| APA | Martinez-Delgado, David.,Laesker, Ronald.,Sharina, Margarita.,Toloba, Elisa.,Fliri, Juergen.,...&Ho, Nhung.(2016).DISCOVERY OF AN ULTRA-DIFFUSE GALAXY IN THE PISCES-PERSEUS SUPERCLUSTER.ASTRONOMICAL JOURNAL,151(4). |
| MLA | Martinez-Delgado, David,et al."DISCOVERY OF AN ULTRA-DIFFUSE GALAXY IN THE PISCES-PERSEUS SUPERCLUSTER".ASTRONOMICAL JOURNAL 151.4(2016). |
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来源：国家天文台
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