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?
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; Delvecchio, I1; Elbaz, D.1; Gao, Y.11; Gobat, R.12; Jin, S.13; Le Floc'h, E.1; Magdis, G. E.14,15,16,17; Mancini, C.2,18; Riechers, D. A.3,19; Rodighiero, G.2,18; Sargent, M.8; Valentino, F.14,15; Zanist, L.20
Corresponding AuthorPuglisi, A.()
AbstractAtacama 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.
Keywordgalaxies: evolution galaxies: high-redshift galaxies: interactions galaxies: ISM galaxies: star formation
Indexed BySCI
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000469811200003
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Document Type期刊论文
Corresponding AuthorPuglisi, A.
Affiliation1.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
11.Chinese Acad Sci, Key Lab Radio Astron, Purple Mt Observ, Nanjing 210034, Jiangsu, Peoples R China
12.Pontificia Univ Catolica Valparaiso, Inst Fis, Casilla 4059, Valparaiso, Chile
13.Nanjing Univ, Sch Astron & Space Sci, Minist Educ, Key Lab Modern Astron & Astrophys, Nanjing 210093, Jiangsu, Peoples R China
14.Univ Copenhagen, Niels Bohr Inst, Cosm Dawn Ctr, Copenhagen, Denmark
15.Tech Univ Denmark, DTU Space, Lyngby, Denmark
16.Univ Copenhagen, Niels Bohr Inst, DK-2100 Copenhagen O, Denmark
17.Natl Observ Athens, Inst Astron Astrophys Space Applicat & Remote Sen, Athens 15236, Greece
18.Univ Padua, Dipartimento Fis & Astron, Vicolo Osservatorio 2, I-35122 Padua, Italy
19.Cornell Univ, Space Sci Bldg, Ithaca, NY 14853 USA
20.Univ Southampton, Dept Phys & Astron, Highfield SO17 1BJ, England
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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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