RELATIONSHIP BETWEEN STAR FORMATION RATE AND BLACK HOLE ACCRETION AT z=2: THE DIFFERENT CONTRIBUTIONS IN QUIESCENT, NORMAL, AND STARBURST GALAXIES

被引：80

作者：

Rodighiero, G. ^{[1
]}

Brusa, M. ^{[2
,4
,6
]}

Daddi, E. ^{[3
]}

Negrello, M. ^{[5
]}

Mullaney, J. R. ^{[7
]}

Delvecchio, I. ^{[2
]}

Lutz, D. ^{[6
]}

Renzini, A. ^{[5
]}

Franceschini, A. ^{[1
]}

Baronchelli, I. ^{[1
]}

Pozzi, F. ^{[2
]}

Gruppioni, C. ^{[4
]}

Strazzullo, V. ^{[3
,8
]}

Cimatti, A. ^{[2
]}

Silverman, J. ^{[9
]}

机构：

[1] Univ Padua, Dipartimento Fis & Astron G Galilei, I-35122 Padua, Italy

[2] Univ Bologna, Dipartimento Fis & Astron, I-40127 Bologna, Italy

[3] Univ Paris Diderot, CEA Saclay, CEA DSM CNRS, Lab AIM,IRFU Serv Astrophys, F-91191 Gif Sur Yvette, France

[4] INAF, Osservatorio Astron Bologna, I-40127 Bologna, Italy

[5] INAF, Osservatorio Astron Padova, I-35122 Padua, Italy

[6] Max Planck Inst Extraterr Phys, D-85748 Garching, Germany

[7] Univ Sheffield, Dept Phys & Astron, Sheffield S3 7RH, S Yorkshire, England

[8] Univ Munich, Dept Phys, D-81679 Munich, Germany

[9] Univ Tokyo, Todai Inst Adv Study, Kavli Inst Phys & Math Universe WPI, Kashiwa, Chiba 2778583, Japan

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2015年 / 800卷 / 01期

关键词：

galaxies: evolution; galaxies: interactions; galaxies: nuclei; galaxies: starburst; ACTIVE GALACTIC NUCLEI; SIMILAR-TO; 2; HOST GALAXIES; FORMING GALAXIES; MASSIVE GALAXIES; COSMOS; COEVOLUTION; CONNECTION; HERSCHEL; GROWTH;

D O I：

10.1088/2041-8205/800/1/L10

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We investigate the co-evolution of the black hole accretion rate (BHAR) and the star formation rate (SFR) in 1.5 < z < 2.5 galaxies displaying a greater diversity of star-forming properties compared to previous studies. We combine X-ray stacking and far-IR photometry of stellar mass-limited samples of normal star-forming, starburst, and quiescent/quenched galaxies in the COSMOS field. We corroborate the existence of a strong correlation between BHAR (i.e., the X-ray luminosity, L-X) and stellar mass (M-*) for normal star-forming galaxies, though we find a steeper relation than previously reported. We find that starbursts show a factor of three enhancement in BHAR compared to normal SF galaxies (against a factor of six excess in SFR), while quiescents show a deficit of a factor times 5.5 at a given mass. One possible interpretation of this is that the starburst phase does not coincide with cosmologically relevant BH growth, or that starburst-inducing mergers are more efficient at boosting SFR than BHAR. Contrary to studies based on smaller samples, we find that the BHAR/SFR ratio of main-sequence (MS) galaxies is not mass invariant, but scales weakly as M-*(0.43 +/- 0.09), implying faster BH growth in more massive galaxies at z similar to 2. Furthermore, BHAR/SFR during the starburst is a factor of two lower than in MS galaxies, at odds with the predictions of hydrodynamical simulations of merger galaxies that foresee a sudden enhancement of L-X/SFR during the merger. Finally, we estimate that the bulk of the accretion density of the universe at z similar to 2 is associated with normal star-forming systems, with only similar to 6(+/- 1)% and similar to 11(+/- 1)% associated with starburst and quiescent galaxies, respectively.

引用

页数：5

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