Confirmation of small dynamical and stellar masses for extreme emission line galaxies at z ∼ 2

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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 (≲ 3 × 109 M⊙). Their large [O III] λ 5007 equivalent widths (500-1100 Å) and faint blue continuum emission imply young ages of 10-100 Myr and stellar masses of 10 8-109 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. © 2013. The American Astronomical Society. All rights reserved.

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Maseda, M. V., Van Der Wel, A., Da Cunha, E., Rix, H. W., Pacifici, C., Momcheva, I., … Wuyts, S. (2013). Confirmation of small dynamical and stellar masses for extreme emission line galaxies at z ∼ 2. Astrophysical Journal Letters, 778(1). https://doi.org/10.1088/2041-8205/778/1/L22

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