dc.contributor.author | Keel, William C. | en_US |
dc.contributor.author | III., Raymond E. White | en_US |
dc.contributor.author | Chapman, Scott | en_US |
dc.contributor.author | Windhorst, Rogier A. | en_US |
dc.date.accessioned | 2014-03-12T19:20:54Z | |
dc.date.available | 2014-03-12T19:20:54Z | |
dc.date.issued | 2009-07-13 | en_US |
dc.identifier.citation | Keel, William C., Raymond E. White III., Scott Chapman, and Rogier A. Windhorst. 2009. "The disappearance of Lyα blobs: a GALEX search at z=0.8." Astronomical Journal 138(3):986. | en_US |
dc.identifier.issn | 0004-6256 | |
dc.identifier.uri | http://hdl.handle.net/10222/45355 | |
dc.identifier.uri | http://dx.doi.org/10.1088/0004-6256/138/3/986 | |
dc.description.abstract | Lyman alpha blobs - luminous, spatially extended emission-line nebulae, often lacking bright continuum counterparts - are common in dense environments at high redshift. Until recently, atmospheric absorption and filter technology have limited our knowledge of any similar objects at z<2. We use GALEX slitless spectroscopy to search for similar objects in the rich environments of two known cluster and supercluster fields at z=0.8, where the instrumental sensitivity peaks. The regions around Cl 1054-0321 and Cl 0023+0423 were each observed in slitless-spectrum mode for 10-19 ksec, with accompanying direct images of 3-6 ksec to assist in recognizing continuum sources. Using several detection techniques, we find no resolved Lyman alpha emitters to a flux limit of(1.5-9) x 10^{-15} erg/ cm^2 s, on size scales of 5-30 arcseconds. This corresponds to line luminosities of (0.5-3) x 10^43 erg/s for linear scales 35-200 kpc. Comparison with both blind and targeted surveys at higher redshifts indicates that the population must have evolved in comoving density at least as strongly as (1+z)^3. These results suggest that the population of Lyman alpha blobs is specific to the the high-redshift Universe. | en_US |
dc.relation.ispartof | The Astronomical Journal | |
dc.title | The disappearance of Lyα blobs: a GALEX search at z=0.8 | en_US |
dc.title.alternative | arXiv:0907.2201 [astro-ph] | en_US |
dc.type | article | en_US |
dc.identifier.volume | 138 | |
dc.identifier.issue | 3 | |
dc.identifier.startpage | 986 | en_US |