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arXiv 1107.2653astro-ph.CO
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高红移典型成星星系团尘埃衰减的GOODS-Herschel测量:z~2紫外选择星系团的观测

GOODS-Herschel Measurements of the Dust Attenuation of Typical Star-Forming Galaxies at High Redshift: Observations of UV-Selected Galaxies at z~2

N. Reddy, M. Dickinson, D. Elbaz, G. Morrison, M. Giavalisco, R. Ivison, C. Papovich, D. Scott, V. Buat, D. Burgarella, V. Charmandaris, E. Daddi, G. Magdis, E.… 展开作者

N. Reddy, M. Dickinson, D. Elbaz, G. Morrison, M. Giavalisco, R. Ivison, C. Papovich, D. Scott, V. Buat, D. Burgarella, V. Charmandaris, E. Daddi, G. Magdis, E. Murphy, B. Altieri, H. Aussel, H. Dannerbauer, K. Dasyra, H. S. Hwang, J. Kartaltepe, R. Leiton, B. Magnelli, P. Popesso

摘要:

我们利用赫歇尔在100和160微米的灵敏度和分辨率直接成像的热尘埃排放和调查的红外光度,L(IR),和典型的恒星形成(L*)星系在高红移尘埃遮蔽。我们的样本由146个在GOODS-North场中光谱红移为1.5<z<2.6的紫外选择星系组成。补充深甚大阵列(VLA)和斯皮策成像,我们在24,100和160微米,和1.4 GHz的这些星系的位置构建中值堆栈。这些叠加通量与各种尘埃模板和刻度的比较表明,在z~2处紫外光度L(UV)> 1 e10 Lsun的典型恒星形成星系是亮红外星系(LIRGs),中值L(IR)=(2.2+/-0.3 e11 Lsun)。1.5<z<2.6的典型星系的尘埃遮蔽中位数L(IR)/L(UV)= 7.1+/-1.1,这对应于尘埃校正因子,需要从未遮蔽的UV SFR中恢复热恒星形成率(SFR)5.2+/-0.6。这一结果与之前对同一星系的紫外线、H-α、24微米、射电和X射线特性的研究所推断的结果相似。堆积在箱子的紫外线斜率意味着L* 星系的红色光谱斜率也dustier,和紫外线斜率和尘埃之间的相关性是类似的本地星爆星系。因此,休息帧30和50微米通量验证平均使用本地紫外线衰减曲线恢复典型的恒星形成星系在高红移的尘埃衰减。在最简单的解释中,本地和高红移紫外线衰减曲线之间的协议表明,在过去的100亿年中,星爆星系的尘埃生产和恒星和尘埃几何形状的相似性。

英文摘要:

We take advantage of the sensitivity and resolution of Herschel at 100 and 160 micron to directly image the thermal dust emission and investigate the infrared luminosities, L(IR), and dust obscuration of typical star-forming (L*) galaxies at high redshift. Our sample consists of 146 UV-selected galaxies with spectroscopic redshifts 1.5<z<2.6 in the GOODS-North field. Supplemented with deep Very Large Array (VLA) and Spitzer imaging, we construct median stacks at the positions of these galaxies at 24, 100, and 160 micron, and 1.4 GHz. The comparison between these stacked fluxes and a variety of dust templates and calibrations implies that typical star-forming galaxies with UV luminosities L(UV)>1e10 Lsun at z~2 are luminous infrared galaxies (LIRGs) with a median L(IR)=(2.2+/-0.3)e11 Lsun. Typical galaxies at 1.5<z<2.6 have a median dust obscuration L(IR)/L(UV) = 7.1+/-1.1, which corresponds to a dust correction factor, required to recover the bolometric star formation rate (SFR) from the unobscured UV SFR, of 5.2+/-0.6. This result is similar to that inferred from previous investigations of the UV, H-alpha, 24 micron, radio, and X-ray properties of the same galaxies studied here. Stacking in bins of UV slope implies that L* galaxies with redder spectral slopes are also dustier, and that the correlation between UV slope and dustiness is similar to that found for local starburst galaxies. Hence, the rest-frame 30 and 50 micron fluxes validate on average the use of the local UV attenuation curve to recover the dust attenuation of typical star-forming galaxies at high redshift. In the simplest interpretation, the agreement between the local and high redshift UV attenuation curves suggests a similarity in the dust production and stellar and dust geometries of starburst galaxies over the last 10 billion years.

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