THE LABOCA SURVEY OF THE EXTENDED CHANDRA DEEP FIELD SOUTH: TWO MODES OF STAR FORMATION IN ACTIVE GALACTIC NUCLEUS HOSTS?

被引：138

作者：

Lutz, D. ^{[1
]}

Mainieri, V. ^{[2
]}

Rafferty, D. ^{[3
]}

Shao, L. ^{[1
]}

Hasinger, G. ^{[4
]}

Weiss, A. ^{[5
]}

Walter, F. ^{[6
]}

Smail, I. ^{[7
]}

Alexander, D. M. ^{[8
]}

Brandt, W. N. ^{[3
]}

Chapman, S. ^{[9
]}

Coppin, K. ^{[7
]}

Schreiber, N. M. Foerster ^{[1
]}

Gawiser, E. ^{[10
]}

Genzel, R. ^{[1
]}

Greve, T. R. ^{[6
]}

Ivison, R. J. ^{[11
,12
]}

Koekemoer, A. M. ^{[13
]}

Kurczynski, P. ^{[10
]}

Menten, K. M. ^{[5
]}

Nordon, R. ^{[1
]}

Popesso, P. ^{[1
]}

Schinnerer, E. ^{[6
]}

Silverman, J. D. ^{[14
]}

Wardlow, J. ^{[8
]}

Xue, Y. Q. ^{[3
]}

机构：

[1] Max Planck Inst Extraterr Phys, D-85741 Garching, Germany

[2] European So Observ, D-85748 Garching, Germany

[3] Penn State Univ, Dept Astron & Astrophys, Davey Lab 525, University Pk, PA 16802 USA

[4] Max Planck Inst Plasma Phys, D-85748 Garching, Germany

[5] Max Planck Inst Radioastron, D-53121 Bonn, Germany

[6] Max Planck Inst Astron, D-69117 Heidelberg, Germany

[7] Univ Durham, Inst Computat Cosmol, Durham DH1 3LE, England

[8] Univ Durham, Dept Phys, Durham DH1 3LE, England

[9] Univ Cambridge, Inst Astron, Cambridge CB3 0HA, England

[10] Rutgers State Univ, Dept Phys & Astron, Piscataway, NJ 08854 USA

[11] Univ Edinburgh, Royal Observ, SUPA, Inst Astron, Edinburgh EH9 3HJ, Midlothian, Scotland

[12] Royal Observ, UK Astron Technol Ctr, Edinburgh EH9 3HJ, Midlothian, Scotland

[13] Space Telescope Sci Inst, Baltimore, MD 21218 USA

[14] Univ Tokyo, IPMU, Chiba 2778568, Japan

来源：

ASTROPHYSICAL JOURNAL | 2010年 / 712卷 / 02期

关键词：

galaxies: active; galaxies: starburst; infrared: galaxies; SPECTRAL ENERGY-DISTRIBUTIONS; DEGREE EXTRAGALACTIC SURVEY; QUASI-STELLAR OBJECTS; OBSCURING DUST TORI; BLACK-HOLE MASS; FORMING GALAXIES; INFRARED-SPECTRA; ULIRG EVOLUTION; REDSHIFT SURVEY; SPITZER QUASAR;

D O I：

10.1088/0004-637X/712/2/1287

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We study the co-existence of star formation and active galactic nucleus (AGN) activity in Chandra X-ray-selected AGN by analyzing stacked 870 mu m submillimeter emission from a deep and wide map of the Extended Chandra Deep Field South (ECDFS), obtained with the LABOCA instrument at the APEX telescope. The total X-ray sample of 895 sources with median redshift z similar to 1 drawn from the combined (E) CDFS X-ray catalogs is detected at > 11 sigma significance at a mean submillimeter flux of 0.49 +/- 0.04 mJy, corresponding to a typical star formation rate (SFR) around 30 M-circle dot yr(-1) for a T = 35 K, beta = 1.5 graybody far-infrared spectral energy distribution. The good signal-to-noise ratio permits stacking analyses for major subgroups, splitting the sample by redshift, intrinsic luminosity, and AGN obscuration properties. We observe a trend of SFR increasing with redshift. An increase of SFR with AGN luminosity is indicated at the highest L2-10keV greater than or similar to 10(44) erg s(-1) luminosities only. Increasing trends with X-ray obscuration as expected in some AGN evolutionary scenarios are not observed for the bulk of the X-ray AGN sample but may be present for the highest intrinsic luminosity objects with L2-10keV greater than or similar to 10(44) erg s(-1). This behavior suggests a transition between two modes in the co-existence of AGN activity and star formation. For the bulk of the sample, the X-ray luminosity and obscuration of the AGN are not intimately linked to the global SFR of their hosts. The hosts are likely massive and forming stars secularly, at rates similar to the pervasive star formation seen in massive galaxies without an AGN at similar redshifts. In these systems, star formation is not linked to a specific state of the AGN and the period of moderately luminous AGN activity may not highlight a major evolutionary transition of the galaxy. The change indicated toward more intense star formation, and a more pronounced increase in SFRs between unobscured and obscured AGN reported in the literature at highest (L2-10keV greater than or similar to 10(44) erg s(-1)) luminosities suggests that these luminous AGNs follow an evolutionary path on which obscured AGN activity and intense star formation are linked, possibly via merging. Comparison to local hard X-ray-selected AGN supports this interpretation. SFRs in the hosts of moderate luminosity AGN at z similar to 1 are an order of magnitude higher than at z similar to 0, following the increase in the non-AGN massive galaxy population. At high AGN luminosities, hosts on the evolutionary link/merger path emerge from this secular level of star formation.

引用

页码：1287 / 1301

页数：15

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