Confirmation of Small Dynamical and Stellar Masses for Extreme Emission Line Galaxies at z 2

M. V. Maseda, A. van der Wel, E. da Cunha, H. W. Rix, C. Pacifici, I. Momcheva, G. B. Brammer, M. Franx, P. van Dokkum, E. F. Bell, M. Fumagalli, N. A. Grogin, D. D. Kocevski, A. M. Koekemoer, B. F. Lundgren, D. Marchesini, E. J. Nelson, S. G. Patel, R. E. Skelton, A. N. StraughnJ. R. Trump, B. J. Weiner, K. E. Whitaker, S. Wuyts

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Abstract

Spectroscopic observations from the Large Binocular Telescope and the Very Large Telescope reveal kinematically narrow lines (~50 km s–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 (lesssim 3 × 109 M ☉). 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 108-109 M ☉, 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.
Original languageEnglish
Article numberL22
Number of pages5
JournalThe Astrophysical Journal Letters
Volume778
Issue number1
Early online date7 Nov 2013
DOIs
Publication statusPublished - 20 Nov 2013

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Keywords

  • galaxies: dwarf
  • galaxies: evolution
  • galaxies: formation
  • galaxies: high-redshift
  • galaxies: starburst

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