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arXiv 1602.01096astro-ph.GA
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在ZFOURGE调查中从~4000 K-选择的镓在1<z<3处测定的UV到IR亮度和尘埃衰减

UV to IR Luminosities and Dust Attenuation Determined from ~4000 K-Selected Galaxies at 1<z<3 in the ZFOURGE Survey

Ben Forrest, Kim-Vy H. Tran, Adam R. Tomczak, Adam Broussard, Ivo Labbé, Casey Papovich, Mariska Kriek, Rebecca J. Allen, Michael Cowley, Mark Dickinson, Karl G… 展开作者

Ben Forrest, Kim-Vy H. Tran, Adam R. Tomczak, Adam Broussard, Ivo Labbé, Casey Papovich, Mariska Kriek, Rebecca J. Allen, Michael Cowley, Mark Dickinson, Karl Glazebrook, Josha van Houdt, Hanae Inami, Glenn G. Kacprzak, Lalitwadee Kawinwanichakij, Daniel Kelson, Patrick J. McCarthy, Andrew Monson, Glenn Morrison, Themiya Nanayakkara, S. Eric Persson, Ryan F. Quadri, Lee R. Spitler, Caroline Straatman, Vithal Tilvi

摘要:

我们从ZFOURGE巡天中的星系中建立了一套复合星系SED,通过去红移和缩放多波长测光,覆盖CDFS,COSMOS和UDS领域。从~4000个K_s波段选定的星系样本中,我们定义了38个复合星系SED,它们在0.1-4 μ m的静止坐标系范围内产生连续的低分辨率光谱(R~45)。此外,我们还包括斯皮策太空望远镜和赫歇尔空间天文台的远红外测光,以表征我们各种复合SED的红外特性。从这些复合SED中,我们分析了静止帧UVJ颜色,以及IR与UV光的比率(IRX)和IRX $-β$尘埃关系中的UV斜率($β$),1<z<3。蓝色恒星形成的复合SED显示IRX和$β$值与当地的关系一致;尘埃恒星形成星系有相当大的散射,发现当地的红外明亮的来源,但平均出现蓝色比预期的红外通量。我们测量了恒星形成复合物的静止坐标系UVJ颜色和尘埃衰减之间的紧密线性关系,提供了一种直接的方法来估计尘埃含量从(U-V)或(V-J)静止坐标系颜色的恒星形成星系在中间红移。

英文摘要:

We build a set of composite galaxy SEDs by de-redshifting and scaling multi-wavelength photometry from galaxies in the ZFOURGE survey, covering the CDFS, COSMOS, and UDS fields. From a sample of ~4000 K_s-band selected galaxies, we define 38 composite galaxy SEDs that yield continuous low-resolution spectra (R~45) over the rest-frame range 0.1-4 um. Additionally, we include far infrared photometry from the Spitzer Space Telescope and the Herschel Space Observatory to characterize the infrared properties of our diverse set of composite SEDs. From these composite SEDs we analyze the rest-frame UVJ colors, as well as the ratio of IR to UV light (IRX) and the UV slope ($β$) in the IRX$-β$ dust relation at 1<z<3. Blue star-forming composite SEDs show IRX and $β$ values consistent with local relations; dusty star-forming galaxies have considerable scatter, as found for local IR bright sources, but on average appear bluer than expected for their IR fluxes. We measure a tight linear relation between rest-frame UVJ colors and dust attenuation for star-forming composites, providing a direct method for estimating dust content from either (U-V) or (V-J) rest-frame colors for star-forming galaxies at intermediate redshifts.

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