The Main Sequence at z similar to 1.3 Contains a Sizable Fraction of Galaxies with Compact Star Formation Sizes: A New Population of Early Post-starbursts?
文献类型：期刊论文
| 作者 | Puglisi, A.1,2; Daddi, E.1; Liu, D.3 ; Bournaud, F.1; Silverman, J. D.4,5; Circosta, C.6; Calabro, A.1; Aravena, M.7; Cibinel, A.8; Dannerbauer, H.9,10
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| 刊名 | ASTROPHYSICAL JOURNAL LETTERS
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| 出版日期 | 2019-06-01 |
| 卷号 | 877期号:2页码:6 |
| 关键词 | galaxies: evolution galaxies: high-redshift galaxies: interactions galaxies: ISM galaxies: star formation |
| ISSN号 | 2041-8205 |
| DOI | 10.3847/2041-8213/ab1f92 |
| 通讯作者 | Puglisi, A.() |
| 英文摘要 | Atacama Large Millimeter/submillimeter Array (ALMA) measurements for 93 Herschel-selected galaxies at 1.1 <= z <= 1.7 in COSMOS reveal a sizable (>29%) population with compact star formation (SF) sizes, lying on average > x 3.6 below the optical stellar mass (M-*)-size relation of disks. This sample widely spans the star-forming main sequence (MS), having 10(8) <= M-* <= 10(11.5 )M(circle dot) and 20 star formation rate (SFR) <= 680 M-circle dot yr(-1). The 32 size measurements and 61 upper limits are measured on ALMA images that combine observations of CO(5-4), CO(4-3), CO(2-1), and lambda(obs )similar to 1.1-1.3 mm continuum, all tracing the star-forming molecular gas. These compact galaxies have instead normally extended K-band sizes, suggesting strong specific SFR gradients. Compact galaxies comprise the 50 +/- 18% of MS galaxies at M-* > 10(11) M-circle dot. This is not expected in standard bimodal scenarios, where MS galaxies are mostly steadily growing extended disks. We suggest that compact MS objects are early post-starburst galaxies in which the merger-driven boost of SF has subsided. They retain their compact SF size until either further gas accretion restores premerger galaxy-wide SF, or until becoming quenched. The fraction of merger-affected SF inside the MS seems thus larger than anticipated and might reach similar to 50% at the highest M-*. The presence of large galaxies above the MS demonstrates an overall poor correlation between galaxy SF size and specific SFR. |
| WOS关键词 | MAJOR MERGERS ; EMISSION |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000469811200003 |
| 出版者 | IOP PUBLISHING LTD |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/27020]  |
| 专题 | 中国科学院紫金山天文台 |
| 通讯作者 | Puglisi, A. |
| 作者单位 | 1.Univ Paris Diderot, Univ Paris Saclay, Sorbonne Paris Cite, CEA,IRFU,DAp,AIM,CNRS, F-91191 Gif Sur Yvette, France 2.INAF Osservatorio Astron Padova, Vicolo Osservatorio 5, I-35122 Padua, Italy 3.Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany 4.Univ Tokyo, Kavli Inst Phys & Math Universe WPI, Todai Inst Adv Study, Kashiwa, Chiba 2778583, Japan 5.Univ Tokyo, Sch Sci, Dept Astron, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1130033, Japan 6.ESO, Karl Schwarschild Str 2, D-85748 Garching, Germany 7.Univ Diego Portales, Fac Ingn, Nucleo Astron, Av Ejercito 441, Santiago, Chile 8.Univ Sussex, Astron Ctr, Dept Phys & Astron, Brighton BN1 9QH, E Sussex, England 9.IAC, E-38205 Tenerife, Spain 10.Univ La Laguna, Dept Astrofis, E-38206 Tenerife, Spain |
| 推荐引用方式 GB/T 7714 | Puglisi, A.,Daddi, E.,Liu, D.,et al. The Main Sequence at z similar to 1.3 Contains a Sizable Fraction of Galaxies with Compact Star Formation Sizes: A New Population of Early Post-starbursts?[J]. ASTROPHYSICAL JOURNAL LETTERS,2019,877(2):6. |
| APA | Puglisi, A..,Daddi, E..,Liu, D..,Bournaud, F..,Silverman, J. D..,...&Zanist, L..(2019).The Main Sequence at z similar to 1.3 Contains a Sizable Fraction of Galaxies with Compact Star Formation Sizes: A New Population of Early Post-starbursts?.ASTROPHYSICAL JOURNAL LETTERS,877(2),6. |
| MLA | Puglisi, A.,et al."The Main Sequence at z similar to 1.3 Contains a Sizable Fraction of Galaxies with Compact Star Formation Sizes: A New Population of Early Post-starbursts?".ASTROPHYSICAL JOURNAL LETTERS 877.2(2019):6. |
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来源：紫金山天文台
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