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Title: CONFIRMATION OF SMALL DYNAMICAL AND STELLAR MASSES FOR EXTREME EMISSION LINE GALAXIES AT z ∼ 2

Spectroscopic observations from the Large Binocular Telescope and the Very Large Telescope reveal kinematically narrow lines (∼50 km s{sup –1}) for a sample of 14 extreme emission line galaxies at redshifts 1.4 < z < 2.3. These measurements imply that the total dynamical masses of these systems are low (≲ 3 × 10{sup 9} M {sub ☉}). Their large [O III] λ5007 equivalent widths (500-1100 Å) and faint blue continuum emission imply young ages of 10-100 Myr and stellar masses of 10{sup 8}-10{sup 9} M {sub ☉}, confirming the presence of a violent starburst. The dynamical masses represent the first such determinations for low-mass galaxies at z > 1. The stellar mass formed in this vigorous starburst phase represents a large fraction of the total (dynamical) mass, without a significantly massive underlying population of older stars. The occurrence of such intense events in shallow potentials strongly suggests that supernova-driven winds must be of critical importance in the subsequent evolution of these systems.
Authors:
; ; ;  [1] ;  [2] ; ; ;  [3] ; ; ;  [4] ; ; ;  [5] ;  [6] ;  [7] ;  [8] ;  [9] ;  [10] ;  [11] more »; « less
  1. Max-Planck-Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg (Germany)
  2. Yonsei University Observatory, Yonsei University, Seoul 120-749 (Korea, Republic of)
  3. Department of Astronomy, Yale University, New Haven, CT 06520 (United States)
  4. Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218 (United States)
  5. Leiden Observatory, Leiden University, Leiden (Netherlands)
  6. Department of Astronomy, University of Michigan, 500 Church Street, Ann Arbor, MI 48109 (United States)
  7. Department of Physics and Astronomy, University of Kentucky, Lexington, KY 40506 (United States)
  8. Department of Astronomy, University of Wisconsin, 475 N Charter Street, Madison, WI 53706 (United States)
  9. Physics and Astronomy Department, Tufts University, Robinson Hall, Room 257, Medford, MA 02155 (United States)
  10. South African Astronomical Observatory, P.O. Box 9, Observatory 7935 (South Africa)
  11. Astrophysics Science Division, Goddard Space Flight Center, Code 665, Greenbelt, MD 20771 (United States)
Publication Date:
OSTI Identifier:
22364129
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal Letters; Journal Volume: 778; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ASTROPHYSICS; EMISSION SPECTRA; GALAXIES; MASS; OXYGEN IONS; POTENTIALS; RED SHIFT; STARS; STELLAR WINDS; SUPERNOVAE; TELESCOPES