MAMBO 1.2 mm Observations of BzK-selected Star-forming Galaxies at z ~ 2

MAMBO 1.2 mm Observations of BzK-selected Star-forming Galaxies at z ~ 2
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MAMBO 1.2 mm 对 z ~ 2 处 BzK 选择的恒星形成星系的观测

DOI:
10.1086/500546
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发表时间:
2005-12
期刊:
The Astrophysical Journal Letters
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--
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其他
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我们提出了MAMBO 1.2毫米观测的五个BzK预选充满活力的星暴星系在z ~ 2。其中两个被检测到超过99.5%的置信水平,1.2毫米通量约1.5毫焦耳。这些毫米级的通量意味着活跃的活动,星星形成率(SFR)为500-1500兆年-1,这也被斯皮策多波段成像光度计(MIPS)在24 μm处的探测所证实。这两个检测到的星系是样本中具有最高SFR的星系,从静止帧UV估计,它们的远红外衍生和UV衍生SFR相当一致。这与局部超亮红外星系(ULIRG)和高z亚毫米/毫米选择星系不同,据报道,紫外线将其SFR低估了10-100倍,但与z ~ 2处的平均BzK ULIRG相似。在1.2毫米处检测到的两个星系在K中比典型的MAMBO和SCUBA源的NIR对应物更亮,这意味着K波段与亚毫米/毫米的通量比也有显着不同。这表明了一种情况,即z ~ 2星系在其快速(亚)毫米亮阶段之后,对光学/紫外光不透明,演变成K波段明亮和大质量物体的持续时间更长的阶段。瞄准紫外线最活跃的BzK星系可以在亚毫米/毫米波长产生可观的探测率。
We present MAMBO 1.2 mm observations of five BzK-preselected vigorous starburst galaxies at z ~ 2. Two of these were detected at more than 99.5% confidence levels, with 1.2 mm fluxes around 1.5 mJy. These millimeter fluxes imply vigorous activity with star formation rates (SFRs) of ≈500-1500 M☉ yr-1, which were also confirmed by detections at 24 μm with the Multiband Imaging Photometer on Spitzer (MIPS). The two detected galaxies are the ones in the sample with the highest SFRs estimated from the rest-frame UV, and their far-IR-derived and UV-derived SFRs agree reasonably well. This is different from local ultraluminous infrared galaxies (ULIRGs) and high-z submillimeter/millimeter-selected galaxies, for which the UV is reported to underestimate SFRs by factors of 10-100, but similar to the average BzK ULIRG at z ~ 2. The two galaxies detected at 1.2 mm are brighter in K than the typical NIR counterparts of MAMBO and SCUBA sources, implying a significantly different K-band-to-submillimeter/millimeter flux ratio as well. This suggests a scenario in which z ~ 2 galaxies, after their rapid (sub)millimeter-bright phase that is opaque to optical/UV light, evolve into a longer lasting phase of K-band-bright and massive objects. Targeting the most UV-active BzK galaxies could yield substantial detection rates at submillimeter/millimeter wavelengths.
DOI: 10.1086/378556
发表时间: 2003-09
期刊: The Astrophysical Journal Letters
影响因子: --
作者:
C. Conselice;N. Grogin;S. Jogee;R. Lucas;T. Dahlén;D. D. de Mello-D.;J. Gardner;B. Mobasher;S. Ravindranath
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发表时间: 2003-03
期刊: The Astrophysical Journal Letters
影响因子: --
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DOI: 10.1086/428082
发表时间: 2004-12
期刊: The Astrophysical Journal
影响因子: --
作者:
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通讯作者: S. Chapman;A. Blain;I. Smail;R. Ivison
DOI: 10.1086/428664
发表时间: 2005-01
期刊: The Astrophysical Journal Letters
影响因子: --
作者:
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通讯作者: K. Adelberger;D. Erb;C. Steidel;N. Reddy;M. Pettini;A. Shapley