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Constraining Dust and Molecular Gas Properties in Lyα Blobs at z ~ 3

Yang, Yujin and Decarli, Roberto and Dannerbauer, Helmut and Walter, Fabian and Weiss, Axel and Leipski, Christian and Dey, Arjun and Chapman, Scott C. and Le Floc'h, Emeric and Prescott, Moire K. M. and Neri, Roberto and Borys, Colin and Matsuda, Yuichi and Yamada, Toru and Hayashino, Tomoki and Tapken, Christian and Menten, Karl M. (2012) Constraining Dust and Molecular Gas Properties in Lyα Blobs at z ~ 3. Astrophysical Journal, 744 (2). Art. No. 178. ISSN 0004-637X. doi:10.1088/0004-637X/744/2/178.

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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) × 10^(12) L_☉, 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(H_2) < (1-3) × 10^(10) M_☉. 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.

Item Type:Article
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URLURL TypeDescription
Yang, Yujin0000-0003-3078-2763
Decarli, Roberto0000-0002-2662-8803
Dannerbauer, Helmut0000-0001-7147-3575
Walter, Fabian0000-0003-4793-7880
Weiss, Axel0000-0003-4678-3939
Dey, Arjun0000-0002-4928-4003
Neri, Roberto0000-0002-7176-4046
Menten, Karl M.0000-0001-6459-0669
Additional Information:© 2012 The American Astronomical Society. Received 2011 September 5; accepted 2011 October 6; published 2011 December 22. We thank the anonymous referee for the prompt report and the helpful comments. We thank Jan Martin Winters and Melanie Krips for supporting our PdBI CO and 1.2 mm observations. Y.Y. thanks Elisabete Da Cunha and Brent Groves for the helpful discussions on the SED fitting. The research activities of A.D. are supported by the National Optical Astronomy Observatory, which is operated by the Association of Universities for Research in Astronomy (AURA) under cooperative agreement with the National Science Foundation. Based on observations carried out with the IRAM Plateau de Bure Interferometer and the IRAM-30m Telescope. IRAM is supported by INSU/CNRS (France), MPG (Germany), and IGN (Spain). This publication is based on data acquired with the Atacama Pathfinder experiment (APEX). APEX is a collaboration between the Max-Planck-Institut für Radioastronomie, the European Southern Observatory, and the Onsala Space Observatory. This work is based in part on observations made with the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory, California Institute of Technology under a contract with NASA. Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA. Facilities: IRAM:Interferometer, Spitzer (MIPS), APEX (LABOCA), IRAM:30m (MAMBO-2), Herschel (SPIRE)
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National Optical Astronomy ObservatoryUNSPECIFIED
Institut National des Sciences de l'Univers (INSU)UNSPECIFIED
Instituto Geográfico Nacional (IGN)UNSPECIFIED
Centre National de la Recherche Scientifique (CNRS)UNSPECIFIED
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Record Number:CaltechAUTHORS:20120202-090332810
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Official Citation:Constraining Dust and Molecular Gas Properties in Lyα Blobs at z ~ 3 Yujin Yang et al. 2012 ApJ 744 178
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:29084
Deposited By: Ruth Sustaita
Deposited On:02 Feb 2012 17:36
Last Modified:09 Nov 2021 17:03

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