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

The Redshift and Nature of AzTEC/COSMOS 1: A Starburst Galaxy at z = 4.6,10.1088/2041-8205/731/2/L27,Astrophysical Journal,V. Smolcic,P. Capak,O. Ilbe

The Redshift and Nature of AzTEC/COSMOS 1: A Starburst Galaxy at z = 4.6  
BibTex | RIS | RefWorks Download
V. Smolcic, P. Capak, O. Ilbert, A. W. Blain, M. Salvato, I. Aretxaga, E. Schinnerer, D. Masters, I. Moric, D. A. Riechers, K. Sheth, M. Aravena
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 mum), CSO/SHARC II (350 mum), 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 3sigma 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. Based on observations with the W. M. Keck Observatory, the Canada-France-Hawaii Telescope, the United Kingdom Infrared Telescope, the Subaru Telescope, the NASA/ESA Hubble Space Telescope, the NASA Spitzer Telescope, the Caltech Sub-mm Observatory, the Smithsonian Millimeter Array, and the National Radio Astronomy Observatory. Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA.
Journal: Astrophysical Journal - ASTROPHYS J , vol. 731, no. 2, 2011
Cumulative Annual
View Publication
The following links allow you to view full publications. These links are maintained by other sources not affiliated with Microsoft Academic Search.