A Caltech Library Service

An Alternate Approach to Measure Specific Star Formation Rates at 2 < z < 7

Davidzon, Iary and Ilbert, Olivier and Faisst, Andreas L. and Sparre, Martin and Capak, Peter L. (2018) An Alternate Approach to Measure Specific Star Formation Rates at 2 < z < 7. Astrophysical Journal, 852 (2). Art. No. 107. ISSN 1538-4357. doi:10.3847/1538-4357/aaa19e.

[img] PDF - Published Version
See Usage Policy.

[img] PDF - Submitted Version
See Usage Policy.


Use this Persistent URL to link to this item:


We trace the specific star formation rate (sSFR) of massive star-forming galaxies (≳ (10)^(10) M_⊙) from z ~ 2 to 7. Our method is substantially different from previous analyses, as it does not rely on direct estimates of star formation rate, but on the differential evolution of the galaxy stellar mass function (SMF). We show the reliability of this approach by means of semianalytical and hydrodynamical cosmological simulations. We then apply it to real data, using the SMFs derived in the COSMOS and CANDELS fields. We find that the sSFR is proportional to (1+z)^(1.1 ± 0.2) at z > 2, in agreement with other observations but in tension with the steeper evolution predicted by simulations from z ~ 4 to 2. We investigate the impact of several sources of observational bias, which, however, cannot account for this discrepancy. Although the SMF of high-redshift galaxies is still affected by significant errors, we show that future large-area surveys will substantially reduce them, making our method an effective tool to probe the massive end of the main sequence of star-forming galaxies.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Davidzon, Iary0000-0002-2951-7519
Ilbert, Olivier0000-0002-7303-4397
Faisst, Andreas L.0000-0002-9382-9832
Sparre, Martin0000-0002-9735-3851
Capak, Peter L.0000-0003-3578-6843
Additional Information:© 2018. The American Astronomical Society. Received 2017 September 6; revised 2017 November 13; accepted 2017 December 11; published 2018 January 12. We thank Paola Santini for providing their data in a convenient digital format and Bahram Mobasher for his useful comments. This work is based on observations and archival data made with the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under a contract with NASA. Support for this work was provided by NASA. This research has made use of the NASA/IPAC Infrared Science Archive, which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. This research is also based on data collected at the Subaru Telescope and retrieved from the HSC data archive system, which is operated by the Subaru Telescope and Astronomy Data Center at the National Astronomical Observatory of Japan. O.I. acknowledges funding of the French Agence Nationale de la Recherche for the SAGACE project. We acknowledge the financial support the COSMOS team receives from the Centre National d'Études Spatiales.
Group:Infrared Processing and Analysis Center (IPAC), COSMOS
Funding AgencyGrant Number
Agence Nationale pour la Recherche (ANR)UNSPECIFIED
Centre National d'Études Spatiales (CNES)UNSPECIFIED
Subject Keywords:galaxies: evolution; galaxies: high-redshift; galaxies: star formation
Issue or Number:2
Record Number:CaltechAUTHORS:20180112-092947647
Persistent URL:
Official Citation:Iary Davidzon et al 2018 ApJ 852 107
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:84291
Deposited By: George Porter
Deposited On:12 Jan 2018 19:18
Last Modified:15 Nov 2021 20:18

Repository Staff Only: item control page