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Constraining Dust and Molecular Gas Properties in Lyman Alpha Blobs at z~3 | Yujin Yang
; Roberto Decarli
; Helmut Dannerbauer
; Fabian Walter
; Axel Weiss
; Christian Leipski
; Arjun Dey
; Scott C. Chapman
; Emeric Le Floc'h
; Moire K. M. Prescott
; Roberto Neri
; Colin Borys
; Yuichi Matsuda
; Toru Yamada
; Tomoki Hayashino
; Christian Tapken
; Karl M. Menten
; | Date: |
7 Oct 2011 | Abstract: | In order to constrain the bolometric luminosities, dust properties and
molecular gas content of giant Lyman alpha nebulae, the so-called Lyman alpha
blobs, we have carried out a study of dust continuum and CO line emission in
two well-studied representatives of this population at z ~ 3: a Lya blob
discovered by its strong Spitzer MIPS 24um detection (LABd05; Dey et al. 2005)
and the Steidel blob 1 (SSA22-LAB01; Steidel et al. 2000). We find that the
spectral energy distribution of LABd05 is well described by an AGN-starburst
composite template with L(FIR) = (4.0 +/- 0.5) x 10^12 Lsun, comparable to
high-z sub-millimeter galaxies and ultraluminous infrared galaxies. New
APEX/LABOCA 870um measurements rule out the reported SCUBA detection of the
SSA22-LAB01 (S[850um] = 16.8 mJy) at the > 4sigma level. Consistent with this,
ultra-deep Plateau de Bure Interferometer (PdBI) observations with ~2arcsec
spatial resolution also fail to detect any 1.2mm continuum source down to
~0.45mJy per beam (3sigma). Combined with the existing (sub)mm observations in
the literature, we conclude that the FIR luminosity of SSA22-LAB01 remains
uncertain. No CO line is detected in either case down to integrated flux limits
of (Snu dV) < 0.25--1.0 Jy km/s, indicating a modest molecular gas reservoir,
M(H_2) < 1--3 x 10^10 Msun. The non-detections exclude, with high significance
(12 sigma), the previous tentative detection of a CO(4-3) line in the
SSA22-LAB01. The increased sensitivity afforded by ALMA will be critical in
studying molecular gas and dust in these interesting systems. | Source: | arXiv, 1110.1457 | Services: | Forum | Review | PDF | Favorites |
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