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Title:
Spitzer Observations of Extended Lyman-α Clouds in the SSA22 Field
Authors:
Webb, T. M. A.; Yamada, T.; Huang, J.-S.; Ashby, M. L. N.; Matsuda, Y.; Egami, E.; Gonzalez, M.; Hayashimo, T.
Affiliation:
AA(McGill Unviersity, Department of Physics, 3600 rue University, Montréal, QC H2A 2T8, Canada ), AB(Astronomical Institute, Graduate School of Science, Tohoku University, Aramaki, Aoba-ku, Sendai 980-8578, Japan ), AC(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA ), AD(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA ), AE(Department of Astronomy, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan ; Optical and Infrared Astronomy Division, National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan ), AF(Department of Astronomy, University of Arizona, 933 N. Cherry Avenue, Rm N204, Tucson, AZ 85721-0065, USA ), AG(McGill Unviersity, Department of Physics, 3600 rue University, Montréal, QC H2A 2T8, Canada ), AH(Research Center for Neutrino Science, Graduate School of Science, Tohoku Univsersity, Sendai 980-8578, Japan)
Publication:
The Astrophysical Journal, Volume 692, Issue 2, pp. 1561-1570 (2009). (ApJ Homepage)
Publication Date:
02/2009
Origin:
IOP
ApJ Keywords:
dust, extinction, galaxies: active, galaxies: formation, galaxies: high-redshift, galaxies: starburst, infrared: galaxies
DOI:
10.1088/0004-637X/692/2/1561
Bibliographic Code:
2009ApJ...692.1561W

Abstract

We present the results of a Spitzer IRAC and MIPS 24 μm study of extended Lyman-α clouds (or Lyman-α Blobs, LABs) within the SSA22 filamentary structure at z = 3.09. We detect 6/26 LABs in all IRAC filters, four of which are also detected at 24 μm, and find good correspondence with the 850 μm measurements of Geach et al. An analysis of the rest-frame ultraviolet, optical, near- and mid-infrared colors reveals that these six systems exhibit signs of nuclear activity (active galactic nucleus (AGN)) and/or extreme star formation. Notably, they have properties that bridge galaxies dominated by star formation (Lyman-break galaxies (LBGs)) and those with AGNs (LBGs classified as QSOs). The LAB systems not detected in all four IRAC bands, on the other hand, are, as a group, consistent with pure star-forming systems, similar to the majority of the LBGs within the filament. These results indicate that the galaxies within LABs do not comprise a homogeneous population, though they are also consistent with scenarios in which the gas halos are ionized through a common mechanism such as galaxy-scale winds driven by the galaxies within them, or gravitational heating of the collapsing cloud itself.
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