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Journal articles
The lesser role of starbursts in star formation at $z=2$
G. Rodighiero
1, *
Emanuele Daddi
2
E. Baronchelli
1
I. Cimatti
3
A. Renzini
4
A. Aussel
2
H. Popesso
4
P. Lutz
4
D. Andreani
5
P. Berta
4
S. Cava
6
A. Elbaz
2
N. M. Förster Schreiber
7
D. Feltre
1
A. Fontana
8
A. Franceschini
1
R. Genzel
7
A. Grazian
9
C. Gruppioni
10
O. Ilbert
11
E. Le Floch
2
G. Magdis
2
M. Magliocchetti
12
B. Magnelli
7
R. Maiolino
9
H. Mccracken
13
R. Nordon
4
A. Poglitsch
4
P. Santini
9
F. Pozzi
1
L. Riguccini
2
L. J. Tacconi
7
S. Wuyts
7
G. Zamorani
10
*
Corresponding author
G. Rodighiero 1
Correspondent author
Emanuele Daddi 2
Author
E. Baronchelli 1
Author
I. Cimatti 3
Author
S. Wuyts 7
Author
G. Zamorani 10
Author
1
Dipartimento di Astronomia [Padova] (Italy)
- Universita degli Studi di Padova (Via 8 Febbraio 2, 35122 Padova - Italy)
2
AIM (UMR_7158 / UMR_E_9005 / UM_112) - Astrophysique Interprétation Modélisation (AIM - UMR 7158 - UMR E 9005,
ex "Astrophysique Interactions Multi-échelles",
Service d'astrophysique,
CEA/Saclay,
Orme des Merisiers
F-91191 GIF SUR YVETTE CEDEX - France)
- CEA - Commissariat à l'énergie atomique et aux énergies alternatives : UMR_E_9005 (Centre de Saclay Centre de Grenoble Centre de Cadarache etc - France)
- INSU - CNRS - Institut national des sciences de l'Univers (INSU-CNRS 3 rue Michel-Ange, 75794 Paris Cedex 16 - France)
- Université Paris-Saclay (Bâtiment Bréguet, 3 Rue Joliot Curie 2e ét, 91190 Gif-sur-Yvette - France)
- CNRS - Centre National de la Recherche Scientifique : UMR_7158 (France)
- UPC - Université Paris Cité : UMR_7158 (85 boulevard Saint-Germain 75006 Paris - France)
3
Dipartimento di Fisica e Astronomia [Bologna] (Via Berti-Pichat 6/2, I-40126 Bologna - Italy)
- UNIBO - Alma Mater Studiorum Università di Bologna [Bologna] (Via Zamboni, 33 - 40126 Bologna - Italy)
4
MPE - Max-Planck-Institut für Extraterrestrische Physik (Giessenbachstr.1, 85748 Garching - Germany)
5
ESO - European Southern Observatory (Karl-Schwarzchild Str. 2 D-85748 Garching bei Munchen - Germany)
6
Departamento de Astrofisica [Madrid] (Centro de Astrobiología, PO Box 78, E-28691, Villanueva de la Cañada, Madrid, Spain - Spain)
- CAB - Centro de Astrobiologia [Madrid] (28850 Torrejón de Ardoz, Madrid - Spain)
- INTA - Instituto Nacional de Técnica Aeroespacial ( Torrejón de Ardoz, Madrid - Spain)
- CSIC - Consejo Superior de Investigaciones Científicas [Madrid] (Spanish National Research Council Serrano 117, 28006 Madrid - Spain)
7
MPE - Max Planck Institute for Extraterrestrial Physics (Germany)
- Max-Planck-Gesellschaft (Jägerstrasse, 10-11, D-10117 Berlin - Germany)
8
Dipartimento di Fisica [Povo] (via Sommarive 14, 38123 Povo (TN) - Italy)
- UNITN - Università degli Studi di Trento (via Calepina, 14 - I-38122 Trento - Italy)
9
OAR - INAF - Osservatorio Astronomico di Roma (Via Frascati 33, 00040, Monte Porzio Catone - Italy)
- INAF - Istituto Nazionale di Astrofisica (Viale del Parco Mellini 84, 00136 Roma - Italy)
10
IASF-Bo - Istituto di Astrofisica Spaziale e Fisica cosmica - Bologna (Via gobetti 101 40129 Bologna - Italy)
- INAF - Istituto Nazionale di Astrofisica (Viale del Parco Mellini 84, 00136 Roma - Italy)
11
LAM - Laboratoire d'Astrophysique de Marseille (Pôle de l'Étoile Site de Château-Gombert 38, rue Frédéric Joliot-Curie 13388 Marseille cedex 13 - France)
- CNRS - Centre National de la Recherche Scientifique : UMR7326 (France)
- INSU - CNRS - Institut national des sciences de l'Univers (INSU-CNRS 3 rue Michel-Ange, 75794 Paris Cedex 16 - France)
- AMU - Aix Marseille Université : UMR7326 (Aix-Marseille Université Jardins du Pharo 58 Boulevard Charles Livon 13284 Marseille cedex 7 - France)
- CNES - Centre National d'Études Spatiales [Toulouse] : UMR7326 (18 avenue Edouard Belin 31401 Toulouse - France)
12
IASF-Roma - Istituto di Astrofisica Spaziale e Fisica cosmica - Roma (Via del Fosso del Cavaliere 100 00133 Roma - Italy)
- INAF - Istituto Nazionale di Astrofisica (Viale del Parco Mellini 84, 00136 Roma - Italy)
13
IAP - Institut d'Astrophysique de Paris (98bis, bd Arago - 75014 Paris France - France)
- INSU - CNRS - Institut national des sciences de l'Univers (INSU-CNRS 3 rue Michel-Ange, 75794 Paris Cedex 16 - France)
- SU - Sorbonne Université (21 rue de l’École de médecine - 75006 Paris - France)
- CNRS - Centre National de la Recherche Scientifique : UMR7095 (France)
Abstract : Two main modes of star formation are know to control the growth of galaxies: a relatively steady one in disk-like galaxies, defining a tight star formation rate (SFR)-stellar mass sequence, and a starburst mode in outliers to such a sequence which is generally interpreted as driven by merging. Such starburst galaxies are rare but have much higher SFRs, and it is of interest to establish the relative importance of these two modes. PACS/Herschel observations over the whole COSMOS and GOODS-South fields, in conjunction with previous optical/near-IR data, have allowed us to accurately quantify for the first time the relative contribution of the two modes to the global SFR density in the redshift interval 1.5 $< z <$ 2.5, i.e., at the cosmic peak of the star formation activity. The logarithmic distributions of galaxy SFRs at fixed stellar mass are well described by Gaussians, with starburst galaxies representing only a relatively minor deviation that becomes apparent for SFRs more than four times higher than on the main sequence. Such starburst galaxies represent only 2% of mass-selected star-forming galaxies and account for only 10% of the cosmic SFR density at z ~ 2. Only when limited to SFR > 1000 $M_☉$/$yr$, off-sequence sources significantly contribute to the SFR density (46% $\pm$ 20%). We conclude that merger-driven starbursts play a relatively minor role in the formation of stars in galaxies, whereas they may represent a critical phase toward the quenching of star formation and morphological transformation in galaxies.
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Journal articles
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https://hal-cea.archives-ouvertes.fr/cea-00994891
Contributor : Bruno Savelli Connect in order to contact the contributor
Submitted on : Monday, November 2, 2020 - 3:23:40 PM
Last modification on : Thursday, April 7, 2022 - 1:58:29 PM
Contributor : Bruno Savelli Connect in order to contact the contributor
Submitted on : Monday, November 2, 2020 - 3:23:40 PM
Last modification on : Thursday, April 7, 2022 - 1:58:29 PM
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- HAL Id : cea-00994891, version 1
- DOI : 10.1088/2041-8205/739/2/L40
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CEA | UP-SCIENCES | SU-SCIENCES | SORBONNE-UNIVERSITE | IAP | OSU-INSTITUT-PYTHEAS | INSU | CNRS | UNIV-AMU | LAM | ANR | SU-TI
Citation
G. Rodighiero, Emanuele Daddi, E. Baronchelli, I. Cimatti, A. Renzini, et al.. The lesser role of starbursts in star formation at $z=2$. The Astrophysical journal letters, Bristol : IOP Publishing, 2011, 739 (2), pp.L40. ⟨10.1088/2041-8205/739/2/L40⟩. ⟨cea-00994891⟩
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