CONSTRAINING DUST AND MOLECULAR GAS PROPERTIES IN Ly[alpha] BLOBS AT z ~ 3

In order to constrain the bolometric luminosities, dust properties, and molecular gas content of giant Ly[alpha] nebulae, the so-called Ly[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: an Ly[alpha] bl...

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Veröffentlicht in:Astrophysical journal. Letters 2012-01, Vol.744 (2), p.1-9
Hauptverfasser: Yang, Yujin, DeCarli, Roberto, Dannerbauer, Helmut, Walter, Fabian, Weiss, Axel, LEIPSKI, CHRISTIAN, Dey, Arjun, Chapman, Scott C, FLOC'H, EMERIC LE, PRESCOTT, MOIRE K M, Neri, Roberto, Borys, Colin, Matsuda, Yuichi, Yamada, Toru, Hayashino, Tomoki, Tapken, Christian, Menten, Karl M
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Sprache:eng
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Zusammenfassung:In order to constrain the bolometric luminosities, dust properties, and molecular gas content of giant Ly[alpha] nebulae, the so-called Ly[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: an Ly[alpha] blob discovered by its strong Spitzer Multiband Infrared Photometer 24 [mu]m 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 sub(FIR) = (4.0 + or - 0.5) x 10 super(12) L sub([sm circle in circle]), comparable to high-z submillimeter galaxies and ultraluminous infrared galaxies. New Large APEX Bolometer Camera 870 [mu]m measurements rule out the reported Submillimeter Common-User Bolometer Array detection of the SSA22-LAB01 (S sub(850 [mu]m) = 16.8 mJy) at the >4[sigma] 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 [approx =]0.45 mJy beam super(-1) (3[sigma]). 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 sub(v)[Delta]V [
ISSN:2041-8205
0004-637X
2041-8213
1538-4357
DOI:10.1088/0004-637X/744/2/178