2005/12/18 by H. Dannerbauer, E. Daddi, M. Onodera +12 · 2 citations
Physics and Astronomy · #Astronomy and Astrophysical Research #Astrophysics and Star Formation Studies #Galaxies: Formation, Evolution, Phenomena #astro-ph
paper · pdf · doi:10.1086/500546
published as Astrophys.J.637:L5-L8,2006 · Accepted for publication by ApJL (4 pages, 2 figures)
arxiv created 2005/12/18 · openalex publication_date 2006/01/19 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/31
We present MAMBO 1.2 mm observations of five BzK -preselected vigorous starburst galaxies at z ~ 2. Two of these were detected at more than 99.5% confidence levels, with 1.2 mm fluxes around 1.5 mJy. These millimeter fluxes imply vigorous activity with star formation rates (SFRs) of ≈500-1500 M ☉ yr -1 , which were also confirmed by detections at 24 μm with the Multiband Imaging Photometer on Spitzer (MIPS). The two detected galaxies are the ones in the sample with the highest SFRs estimated from the rest-frame UV, and their far-IR-derived and UV-derived SFRs agree reasonably well. This is different from local ultraluminous infrared galaxies (ULIRGs) and high- z submillimeter/millimeter-selected galaxies, for which the UV is reported to underestimate SFRs by factors of 10-100, but similar to the average BzK ULIRG at z ~ 2. The two galaxies detected at 1.2 mm are brighter in K than the typical NIR counterparts of MAMBO and SCUBA sources, implying a significantly different K -band-to-submillimeter/millimeter flux ratio as well. This suggests a scenario in which z ~ 2 galaxies, after their rapid (sub)millimeter-bright phase that is opaque to optical/UV light, evolve into a longer lasting phase of K -band-bright and massive objects. Targeting the most UV-active BzK galaxies could yield substantial detection rates at submillimeter/millimeter wavelengths.