GOODS–Herschel: an infrared main sequence for star-forming galaxies
David Elbaz,Mark Dickinson,Ho Seong Hwang,Tanio Díaz-Santos,Georgios E. Magdis,Benjamin Magnelli,D. Le Borgne,Frédéric Galliano,Maurilio Pannella,P. Chanial,Lee Armus,Vassilis Charmandaris,Vassilis Charmandaris,Emanuele Daddi,Herve Aussel,P. Popesso,Jeyhan S. Kartaltepe,Bruno Altieri,Ivan Valtchanov,D. Coia,Helmut Dannerbauer,Kalliopi Dasyra,Roger Leiton,Roger Leiton,Joseph M. Mazzarella,David M. Alexander,V. Buat,Denis Burgarella,R.-R. Chary,Roberto Gilli,Rob Ivison,Rob Ivison,Stéphanie Juneau,E. Le Floc'h,Dieter Lutz,G. E. Morrison,James Mullaney,Eric J. Murphy,Alexandra Pope,Douglas Scott,Mark Brodwin,Daniela Calzetti,C. Cesarsky,Stéphane Charlot,Herve Dole,Peter Eisenhardt,Henry C. Ferguson,N. M. Förster Schreiber,Dave Frayer,Mauro Giavalisco,Minh Huynh,Anton M. Koekemoer,Casey Papovich,Naveen A. Reddy,Christian Surace,Harry I. Teplitz,Min S. Yun,G. W. Wilson +57 more
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In this paper, the authors examined the infrared (IR) 3-500μm spectral energy distributions (SEDs) of galaxies at 0 < z < 2.5, supplemented by a local reference sample from IRAS, ISO, Spitzer, and AKARI data.Abstract:
We present the deepest 100 to 500 μm far-infrared observations obtained with the Herschel Space Observatory as part of the GOODS-Herschel key program, and examine the infrared (IR) 3–500 μm spectral energy distributions (SEDs) of galaxies at 0 < z < 2.5, supplemented by a local reference sample from IRAS, ISO, Spitzer, and AKARI data. We determine the projected star formation densities of local galaxies from their radio and mid-IR continuum sizes.
We find that the ratio of total IR luminosity to rest-frame 8 μm luminosity, IR8 (≡ L_(IR)^(tot)/L_8), follows a Gaussian distribution centered on IR8 = 4 (σ = 1.6) and defines an IR main sequence for star-forming galaxies independent of redshift and luminosity. Outliers from this main sequence produce a tail skewed toward higher values of IR8. This minority population ( 3 × 10^(10) L_⊙ kpc^(-2)) and a high specific star formation rate (i.e., starbursts). The rest-frame, UV-2700 A size of these distant starbursts is typically half that of main sequence galaxies, supporting the correlation between star formation density and starburst activity that is measured for the local sample.
Locally, luminous and ultraluminous IR galaxies, (U)LIRGs (L_(IR)^(tot)≥ 10^(11) L_☉), are systematically in the starburst mode, whereas most distant (U)LIRGs form stars in the “normal” main sequence mode. This confusion between two modes of star formation is the cause of the so-called “mid-IR excess” population of galaxies found at z > 1.5 by previous studies. Main sequence galaxies have strong polycyclic aromatic hydrocarbon (PAH) emission line features, a broad far-IR bump resulting from a combination of dust temperatures (T_(dust) ~ 15–50 K), and an effective T_(dust) ~ 31 K, as derived from the peak wavelength of their infrared SED. Galaxies in the starburst regime instead exhibit weak PAH equivalent widths and a sharper far-IR bump with an effective T_(dust)~ 40 K. Finally, we present evidence that the mid-to-far IR emission of X-ray active galactic nuclei (AGN) is predominantly produced by star formation and that candidate dusty AGNs with a power-law emission in the mid-IR systematically occur in compact, dusty starbursts. After correcting for the effect of starbursts on IR8, we identify new candidates for extremely obscured AGNs.read more
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Lyman break and ultraviolet-selected galaxies at z ∼ 1 – II. PACS 100 μm/160 μm FIR detections
I. Oteo,I. Oteo,Georgios E. Magdis,Ángel Bongiovanni,Ángel Bongiovanni,A. M. Pérez-García,A. M. Pérez-García,J. Cepa,J. Cepa,B. Cedrés,B. Cedrés,Alessandro Ederoclite,M. Sánchez-Portal,J. A. L. Aguerri,J. A. L. Aguerri,Emilio J. Alfaro,Bruno Altieri,Paola Andreani,T. Aparicio-Villegas,Herve Aussel,Narciso Benítez,S. Berta,Tom Broadhurst,Jesús Cabrera-Caño,Francisco J. Castander,Miguel Cerviño,Andrea Cimatti,David Cristóbal-Hornillos,Emanuele Daddi,David Elbaz,Alberto Fernández-Soto,Alberto Fernández-Soto,N. M. Foerster Schreiber,R. Genzel,R. M. Gonzalez-Delgado,C. Husillos,Leopoldo Infante,E. Le Floc'h,Dieter Lutz,Benjamin Magnelli,Roberto Maiolino,Isabel Márquez,Vicent J. Martínez,Josefa Masegosa,I. Matute,Mariano Moles,Alberto Molino,A. del Olmo,Jaime Perea,Ricardo Pérez-Martínez,I. Pintos-Castro,I. Pintos-Castro,Albrecht Poglitsch,J. Polednikova,J. Polednikova,P. Popesso,Mirjana Pović,Francesca Pozzi,Francisco Prada,J. M. Quintana,L. Riguccini,Eckhard Sturm,Linda J. Tacconi,I. Valtchanov,Kerttu Viironen +64 more
TL;DR: In this paper, the spectral energy distribution (SED) fitting with stellar population templates to their UV-to-near-IR observed photometry was used to detect Lyman break galaxies (LBGs) in the cosmic evolution survey (COSMOS) field.
Journal ArticleDOI
HerMES: THE FAR-INFRARED EMISSION FROM DUST-OBSCURED GALAXIES
J. A. Calanog,Julie Wardlow,Hai Fu,Hai Fu,Asantha Cooray,Asantha Cooray,Roberto J. Assef,J. J. Bock,J. J. Bock,Caitlin M. Casey,A. Conley,Duncan Farrah,Duncan Farrah,Edo Ibar,Jeyhan S. Kartaltepe,Georgios E. Magdis,Lucia Marchetti,Lucia Marchetti,S. J. Oliver,Ismael Perez-Fournon,Ismael Perez-Fournon,Dominik A. Riechers,Dimitra Rigopoulou,Dimitra Rigopoulou,Isaac Roseboom,Isaac Roseboom,Benjamin L. Schulz,Douglas Scott,M. Symeonidis,Mattia Vaccari,Mattia Vaccari,Marco P. Viero,Michael Zemcov,Michael Zemcov +33 more
TL;DR: In this paper, the authors present far-infrared (far-IR) observations of a complete sample of DOGs in the 2 deg^2 of the Cosmic Evolution Survey.
Journal ArticleDOI
The Host Galaxies of X-ray Quasars Are Not Strong Star Formers
Amy J. Barger,Amy J. Barger,Lennox L. Cowie,Frazer N. Owen,Chian-Chou Chen,Guenther Hasinger,Li-Yen Hsu,Yanxia Li +7 more
TL;DR: In this paper, the authors measured the submillimeter fluxes of the 4-8 keV sources at z>1, finding little flux at the highest X-ray luminosity but significant flux at intermediate luminosities.
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Herschel observed stripe 82 quasars and their host galaxies: connections between agn activity and host galaxy star formation
Xiaoyi Dong,Xue-Bing Wu +1 more
TL;DR: The Emergence of Cosmological Structures of the Chinese Academy of Sciences (XDB09000000), National Key Basic Research Program of China [2014CB845700], Alfred P. Sloan Foundation; National Science Foundation; U.S. Department of Energy; National Aeronautics and Space Administration; Japanese Monbukagakusho; Max Planck Society; Higher Education Funding Council for England;
Journal ArticleDOI
The main sequence of star-forming galaxies at z ∼ 0.6: reinstating major mergers
TL;DR: In this article, the authors show that there is no tension between the main sequence scatter and the average duration of the fusion star formation rate SFR peak, which implies that the total fraction of the SFR associated to galaxies undergoing major mergers must account for the three merger phases.
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