A dusty star-forming galaxy at z=6 revealed by strong gravitational lensing
astro-ph.GA
/ Authors
Jorge A. Zavala, Alfredo Montaña, David H. Hughes, Min S. Yun, R. J. Ivison, Elisabetta Valiante, David Wilner, Justin Spilker, Itziar Aretxaga, Stephen Eales
and 21 more authors
Vladimir Avila-Reese, Miguel Chávez, Asantha Cooray, Helmut Dannerbauer, James S. Dunlop, Loretta Dunne, Arturo I. Gómez-Ruiz, Michal J. Michalowski, Gopal Narayanan, Hooshang Nayyeri, Ivan Oteo, Daniel Rosa González, David Sánchez-Argüelles, Stephen Serjeant, Matthew W. L. Smith, Elena Terlevich, Olga Vega, Alan Villalba, Paul van der Werf, Grant W. Wilson, Milagros Zeballos
/ Abstract
Since their discovery, submillimetre-selected galaxies (SMGs) have revolutionized the field of galaxy formation and evolution. From the hundreds of square degrees mapped at submillimetre wavelengths, only a handful of sources have been confirmed to lie at z>5 and only two at z>6. All of these SMGs are rare examples of extreme starburst galaxies with star formation rates (SFRs) of >1000 M_sun/yr and therefore are not representative of the general population of dusty star-forming galaxies. Consequently, our understanding of the nature of these sources, at the earliest epochs, is still incomplete. Here we report the spectroscopic identification of a gravitationally amplified (mu = 9.3 +/- 1.0) dusty star-forming galaxy at z=6.027. After correcting for gravitational lensing, we derive an intrinsic less-extreme SFR of 380 +/- 50 M_sun/yr for this source and find that its gas and dust properties are similar to those measured for local Ultra Luminous Infrared Galaxies (ULIRGs), extending the local trends to a poorly explored territory in the early Universe. The star-formation efficiency of this galaxy is similar to those measured in its local analogues, despite a ~12 Gyr difference in cosmic time.