Bridge, Carrie R. and Blain, Andrew and Borys, Colin J. K. and Petty, Sara and Benford, Dominic and Eisenhardt, Peter and Farrah, Duncan and Griffith, Roger L. and Jarrett, Tom and Stanford, S. Adam and Stern, Daniel and Tsai, Chao-Wei and Wright, Edward L. and Wu, Jingwen (2012) A New Population of High Redshift, Dusty Lyman-Alpha Emitters and Blobs Discovered by WISE. . (Submitted) http://resolver.caltech.edu/CaltechAUTHORS:20120604-084501850
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We report a new technique to select 1.6 ≾ z ≾ 4.6 dusty Lyman-alpha emitters (LAEs), over a third of which are ‘blobs’ (LABs) with emission extended on scales of 30-100 kpc. Combining data from the NASA Wide-field Infrared Survey Explorer (WISE) mission with optical spectroscopy from the W. M. Keck telescope, we present a color criteria that yields a 78% success rate in identifying rare, dusty LAEs of which at least 37% are LABs. The objects have a surface density of only ~ 0.1 deg^(−2), making them rare enough that they have been largely missed in narrow surveys. We measured spectroscopic redshifts for 92 of these WISE-selected, typically radio-quiet galaxies and find that the LAEs (LABs) have a median redshift of 2.3 (2.5). The WISE photometry coupled with data from Herschel reveals that these galaxies have extreme far-infrared luminosities (L_(IR) ≳ 10^(13−14)L_⊙) and warm colors, typically larger than submillimeter-selected galaxies (SMGs) and dust-obscured galaxies (DOGs). These traits are commonly associated with the dust being energized by intense AGN activity. We hypothesize that the combination of spatially extended Ly–α, large amounts of warm IR-luminous dust, and rarity (implying a short-lived phase) can be explained if the galaxies are undergoing strong ‘feedback’ transforming them from an extreme dusty starburst to a QSO.
|Item Type:||Report or Paper (Discussion Paper)|
|Additional Information:||This publication makes use of data products from the Wide-field Infrared Survey Explorer, which is a joint project of the University of California, Los Angeles, and the Jet Propulsion Laboratory/California Institute of Technology, funded by the National Aeronautics and Space Administration. Some of the data presented herein were obtained at the W.M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California and the National Aeronautics and Space Administration. The Observatory was made possible by the generous financial support of the W.M. Keck Foundation. The authors wish to recognize and acknowledge the very significant cultural role and reverence that the summit of Mauna Kea has always had within the indigenous Hawaiian community. We are most fortunate to have the opportunity to conduct observations from this mountain. Facilities: WISE, Keck (LRIS),Herschel (PACS, SPIRE)|
|Subject Keywords:||galaxies: high-redshift— galaxies: starburst—infrared: galaxies—galaxies: ISM— galaxies: formation|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Tony Diaz|
|Deposited On:||27 Jul 2012 17:33|
|Last Modified:||26 Dec 2012 15:18|
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