Skip navigation
  • INAF logo
  • Home
  • Communities
    & Collections
  • Research outputs
  • Researchers
  • Organization units
  • Projects
  • Explore by
    • Research outputs
    • Researchers
    • Organization units
    • Projects
  • Login:
    • My DSpace
    • Receive email
      updates
    • Edit Account details
  • Italian
  • English

  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/27879
Title: ISM Masses and the Star formation Law at Z = 1 to 6: ALMA Observations of Dust Continuum in 145 Galaxies in the COSMOS Survey Field
Authors: Scoville, N.
Sheth, K.
Aussel, H.
Vanden Bout, P.
Capak, P.
BONGIORNO, ANGELA 
Casey, C. M.
Murchikova, L.
Koda, J.
Álvarez-Márquez, J.
Lee, N.
Laigle, C.
McCracken, H. J.
Ilbert, O.
Pope, A.
Sanders, D.
Chu, J.
Toft, S.
Ivison, R. J.
Manohar, S.
Issue Date: 2016
Journal: THE ASTROPHYSICAL JOURNAL 
Number: 820
Issue: 2
First Page: 83
Abstract: ALMA Cycle 2 observations of long-wavelength dust emission in 145 star-forming galaxies are used to probe the evolution of the star-forming interstellar medium (ISM). We also develop a physical basis and empirical calibration (with 72 low-z and z ∼ 2 galaxies) for using the dust continuum as a quantitative probe of ISM masses. The galaxies with the highest star formation rates (SFRs) at < z> = 2.2 and 4.4 have gas masses up to 100 times that of the Milky Way and gas mass fractions reaching 50%-80%, I.e., gas masses 1-4× their stellar masses. We find a single high-z star formation law: {SFR}=35 {M}<SUB>{mol</SUB>}<SUP>0.89</SUP>× {(1+z)}<SUB>z=2</SUB><SUP>0.95</SUP>× {({sSFR})}<SUB>{MS</SUB>}<SUP>0.23</SUP> {M}<SUB>☉ </SUB> yr<SUP>-1</SUP>—an approximately linear dependence on the ISM mass and an increased star formation efficiency per unit gas mass at higher redshift. Galaxies above the main sequence (MS) have larger gas masses but are converting their ISM into stars on a timescale only slightly shorter than those on the MS; thus, these “starbursts” are largely the result of having greatly increased gas masses rather than an increased efficiency of converting gas to stars. At z > 1, the entire population of star-forming galaxies has ∼2-5 times shorter gas depletion times than low-z galaxies. These shorter depletion times indicate a different mode of star formation in the early universe—most likely dynamically driven by compressive, high-dispersion gas motions—a natural consequence of the high gas accretion rates.
URI: http://hdl.handle.net/20.500.12386/27879
URL: https://iopscience.iop.org/article/10.3847/0004-637X/820/2/83
ISSN: 0004-637X
DOI: 10.3847/0004-637X/820/2/83
Bibcode ADS: 2016ApJ...820...83S
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

Files in This Item:
File Description SizeFormat 
Scoville_2016_ApJ_820_83.pdfPdf editoriale1.19 MBAdobe PDFView/Open
Scoville_1511.05149.pdf1.09 MBAdobe PDFView/Open
Show full item record

Page view(s)

9
checked on Jan 19, 2021

Download(s)

5
checked on Jan 19, 2021

Google ScholarTM

Check

Altmetric


Items in DSpace are published in Open Access, unless otherwise indicated.


Explore by
  • Communities
    & Collections
  • Research outputs
  • Researchers
  • Organization units
  • Projects

Informazioni e guide per autori

https://openaccess-info.inaf.it: tutte le informazioni sull'accesso aperto in INAF

Come si inserisce un prodotto: le guide a OA@INAF

La Policy INAF sull'accesso aperto

Documenti e modelli scaricabili

Feedback
Built with DSpace-CRIS - Extension maintained and optimized by Logo 4SCIENCE