CONSTRAINING DUST AND MOLECULAR GAS PROPERTIES IN Lyα BLOBS AT z ∼ 3
CONSTRAINING DUST AND MOLECULAR GAS PROPERTIES IN Lyα BLOBS AT z ∼ 3
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DOI：
10.1088/0004-637x/744/2/178
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发表时间：
2011-10
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通讯作者：
Yujin Yang;R. Decarli;H. Dannerbauer;F. Walter;A. Weiss;C. Leipski;A. Dey;S. Chapman;É. Le Floc'h;M. Prescott;R. Neri;C. Borys;Y. Matsuda;Toru Yamada;T. Hayashino;C. Tapken;K. Menten
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作者：
Yujin Yang;R. Decarli;H. Dannerbauer;F. Walter;A. Weiss;C. Leipski;A. Dey;S. Chapman;É. Le Floc'h;M. Prescott;R. Neri;C. Borys;Y. Matsuda;Toru Yamada;T. Hayashino;C. Tapken;K. Menten
为了限制巨型 Lyα 星云（即所谓的 Lyα 斑点）的辐射热光度、尘埃特性和分子气体含量，我们对 z ∼ 3 处该星云的两个经过充分研究的代表进行了尘埃连续谱和 CO 线发射的研究：通过其强大的 Spitzer 多波段红外光度计 24 μm 探测 (LABd05) 发现的 Lyα 斑点和 Steidel 斑点 1 （SSA22-LAB01）。我们发现 LABd05 的光谱能量分布可以通过 LFIR = (4.0 ± 0.5) × 1012 L☉ 的活动星系核-星暴复合模板很好地描述，与高 z 亚毫米星系和超亮红外星系相当。新型大型 APEX 测辐射热计相机 870 μm 测量结果排除了所报告的 SSA22-LAB01 (S850 μm = 16.8 mJy) 亚毫米通用测辐射热计阵列在 >4σ 水平上的检测。与此一致的是，空间分辨率为 ∼2" 的超深高原德布尔干涉仪观测也无法检测到任何低至 ≈0.45 mJy 光束−1 (3σ) 的 1.2 mm 连续源。结合文献中现有的（亚）毫米观测结果，我们得出结论，SSA22-LAB01 的 FIR 光度仍然不确定。在这两种情况下都没有检测到 CO 线，低至 SνΔV ≲ 0.25–1.0 Jy km s−1 的积分通量限制，表明中等分子气藏，M(H2) < (1–3) × 1010 M☉。未检测到的结果以高显着性 (12σ) 排除了之前在 SSA22-LAB01 中检测到的 CO J = 4–3 线。阿塔卡马大型毫米/亚毫米阵列所提供的更高灵敏度对于研究这些有趣系统中的分子气体和灰尘至关重要。
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 LFIR = (4.0 ± 0.5) × 1012 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 (S850 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 SνΔV ≲ 0.25–1.0 Jy km s−1, indicating a modest molecular gas reservoir, M(H2) < (1–3) × 1010 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.