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Bridging between the integrated and resolved main sequence of star formation

Hemmati, Shoubaneh and Mobasher, Bahram and Nayyeri, Hooshang and Shahidi, Abtin and Capak, Peter and Darvish, Behnam and Chartab, Nima and Jafariyazani, Marzyeh and Sattari, Zahra (2020) Bridging between the integrated and resolved main sequence of star formation. Astrophysical Journal Letters, 896 (1). Art. No. L17. ISSN 2041-8213. https://resolver.caltech.edu/CaltechAUTHORS:20200608-105510415

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Abstract

The position of galaxies on the stellar mass, star formation rate (SFR) plane with respect to the star-forming main sequence at each redshift is a convenient way to infer where the galaxy is in its evolution compared to the rest of the population. We use Hubble Space Telescope high-resolution images in the GOODS-S field from the the Cosmic Assembly Near-IR Deep Extragalactic Legacy Survey (CANDELS) and fit multiwavelength lights in resolution elements of galaxies with stellar population synthesis models. We then construct resolved kpc-scale stellar mass, SFR surface density curves for galaxies at z ~ 1. Fitting these resolved main sequence curves with Schechter functions, we parameterize and explain the multiwavelength structure of galaxies with three variables: φ*, α, and M*. For quenched galaxies below the main sequence, we find an average high-mass slope (α) of the resolved main sequence curves to be ~−0.4. The scatter of this slope is higher among the lower mass star-forming galaxies and those above the main sequence compared to quenched galaxies, due to lack of an evolved bulge. Our findings agree well with an inside-out quenching of star formation. We find that the knee of the Schechter fits (M*) for galaxies below the main sequence occurs at lower stellar mass surface densities compared to star-forming galaxies, which hints at how far quenching has proceeded outward.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.3847/2041-8213/ab7243DOIArticle
https://arxiv.org/abs/2002.01011arXivDiscussion Paper
ORCID:
AuthorORCID
Hemmati, Shoubaneh0000-0003-2226-5395
Nayyeri, Hooshang0000-0001-8242-9983
Shahidi, Abtin0000-0001-6975-6293
Capak, Peter0000-0003-3578-6843
Darvish, Behnam0000-0003-4919-9017
Chartab, Nima0000-0003-3691-937X
Sattari, Zahra0000-0002-0364-1159
Additional Information:© 2020 The American Astronomical Society. Received 2019 December 3; revised 2020 January 24; accepted 2020 February 3; published 2020 June 11. We wish to thank the referee for providing very useful suggestions and recommendations. S.H. is thankful to A. Pagul for careful reading of this manuscript and for constructive comments. B.D. acknowledges financial support from the National Science Foundation, grant No. 1716907. Parts of this research were carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration.
Group:COSMOS, Infrared Processing and Analysis Center (IPAC)
Funders:
Funding AgencyGrant Number
NSFAST-1716907
NASA/JPL/CaltechUNSPECIFIED
Subject Keywords:Galaxies ; Star formation ; Galaxy quenching ; Galaxy structure ; Galaxy bulges ; Dynamical evolution ; Astrostatistics ; Galaxy evolution
Issue or Number:1
Classification Code:Unified Astronomy Thesaurus concepts: Galaxies (573); Star formation (1569); Galaxy quenching (2040); Galaxy structure (622); Galaxy bulges (578); Dynamical evolution (421); Astrostatistics (1882); Galaxy evolution (594)
Record Number:CaltechAUTHORS:20200608-105510415
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20200608-105510415
Official Citation:Shoubaneh Hemmati et al 2020 ApJL 896 L17
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:103747
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:08 Jun 2020 18:11
Last Modified:11 Jun 2020 18:05

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