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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



ID: 660576.0, MPI für Astronomie / Publikationen_mpia
Constraining dust and molecular gas properties in Lyα blobs at z ~ 3
Authors:Yang, Y.; Decarli, R.; Dannerbauer, H.; Walter, F.; Weiss, A.; Leipski, C.; Dey, A.; Chapman, S. C.; Le Floc'h, E.; Prescott, M. K. M.; Neri, R.; Borys, C.; Matsuda, Y.; Yamada, T.; Hayashino, T.; Tapken, C.; Menten, K. M.
Date of Publication (YYYY-MM-DD):2012
Journal Abbrev.:The Astrophysical Journal
Volume:744
Issue / Number:2
Start Page:id. 178
Audience:Not Specified
Abstract / Description:In order to constrain the bolometric luminosities, dust properties, and molecular gas content of giant Lyα nebulae, the so-called Lyα 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: an Lyα blob discovered by its strong Spitzer Multiband Infrared Photometer 24 μm detection (LABd05) and the Steidel blob 1 (SSA22-LAB01). We find that the spectral energy distribution of LABd05 is well described by an active-galactic-nucleus-starburst composite template with L FIR = (4.0 ± 0.5) × 1012 L &sun;, comparable to high-z submillimeter galaxies and ultraluminous infrared galaxies. New Large APEX Bolometer Camera 870 μm measurements rule out the reported Submillimeter Common-User Bolometer Array detection of the SSA22-LAB01 (S 850 μm = 16.8 mJy) at the >4σ level. Consistent with this, ultradeep Plateau de Bure Interferometer observations with ~2'' spatial resolution also fail to detect any 1.2 mm continuum source down to ≈0.45 mJy beam-1 (3σ). Combined with the existing (sub)millimeter 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 S νΔV <~ 0.25-1.0 Jy km s-1, indicating a modest molecular gas reservoir, M(H2) < (1-3) × 1010 M &sun;. The non-detections exclude, with high significance (12σ), the previous tentative detection of a CO J = 4-3 line in the SSA22-LAB01. The increased sensitivity afforded by the Atacama Large Millimeter/submillimeter Array will be critical in studying molecular gas and dust in these interesting systems.
Free Keywords:galaxies: formation; galaxies: high-redshift; intergalactic medium; radio lines: galaxies; submillimeter: galaxies
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL:http://cdsads.u-strasbg.fr/abs/2012ApJ...744..178Y
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