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The Redshift and Nature of AzTEC/COSMOS 1 : A Starburst Galaxy at z = 4.6 (CROSBI ID 210477)

Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija

Smolčić, Vernesa ; Capak, P. ; Ilbert, O. ; Blain, A.W. ; Salvato, M. ; Aretxaga, I. ; Schinnerer, E. ; Masters, D. ; Morić, I. ; Riechers, D.A. et al. The Redshift and Nature of AzTEC/COSMOS 1 : A Starburst Galaxy at z = 4.6 // The Astrophysical journal, 731 (2011), 2; L27-1-L27-6. doi: 10.1088/2041-8205/731/2/L27

Podaci o odgovornosti

Smolčić, Vernesa ; Capak, P. ; Ilbert, O. ; Blain, A.W. ; Salvato, M. ; Aretxaga, I. ; Schinnerer, E. ; Masters, D. ; Morić, I. ; Riechers, D.A. ; Sheth, K. ; Aravena, M. ; Aussel, H. ; Aguirre, J. ; Berta, S. ; Carilli, C.L. ; Civano, F. ; Fazio, G. ; Huang, J. ; Hughes, D. ; Kartaltepe, J. ; Koekemoer, A.M. ; Kneib, J.-P. ; LeFloc'h, E. ; Lutz, D. ; McCracken, H. ; Mobasher, B. ; Murphy, E. ; Pozzi, F. ; Riguccini, L. ; Sanders, D.B. ; Sargent, M. ; Scott, K.S. ; Scoville, N.Z. ; Taniguchi, Y. ; Thompson, D. ; Willott, C. ; Wilson, G. ; Yun, M.

engleski

The Redshift and Nature of AzTEC/COSMOS 1 : A Starburst Galaxy at z = 4.6

Based on broadband/narrowband photometry and Keck DEIMOS spectroscopy, we report a redshift of z = 4.64+0.06 -0.08 for AzTEC/COSMOS 1, the brightest submillimeter galaxy (SMG) in the AzTEC/COSMOS field. In addition to the COSMOS- survey X-ray to radio data, we report observations of the source with Herschel/PACS (100, 160 μm), CSO/SHARC II (350 μm), and CARMA and PdBI (3 mm). We do not detect CO(5 → 4) line emission in the covered redshift ranges, 4.56-4.76 (PdBI/CARMA) and 4.94-5.02 (CARMA). If the line is within this bandwidth, this sets 3σ upper limits on the gas mass to lsim8 × 109 M sun and lsim5 × 1010 M sun, respectively (assuming similar conditions as observed in z ~ 2 SMGs). This could be explained by a low CO- excitation in the source. Our analysis of the UV-IR spectral energy distribution of AzTEC 1 shows that it is an extremely young (lsim50 Myr), massive (M * ~ 1011 M sun), but compact (lsim2 kpc) galaxy, forming stars at a rate of ~1300 M sun yr-1. Our results imply that AzTEC 1 is forming stars in a "gravitationally bound" regime in which gravity prohibits the formation of a superwind, leading to matter accumulation within the galaxy and further generations of star formation.

galaxies: distances and redshifts; galaxies: high-redshift; galaxies: starburst

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Podaci o izdanju

731 (2)

2011.

L27-1-L27-6

objavljeno

0004-637X

10.1088/2041-8205/731/2/L27

Povezanost rada

Fizika

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