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arXiv 1310.0474astro-ph.CO
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COSMOS场中Herschel选择半导体的多波长SEDs

Multi-Wavelength SEDs of Herschel Selected Galaxies in the COSMOS Field

Nicholas Lee, D. B. Sanders, Caitlin M. Casey, N. Z. Scoville, Chao-Ling Hung, Emeric Le Floc'h, Olivier Ilbert, Herve Aussel, Peter Capak, Jeyhan S. Kartaltepe… 展开作者

Nicholas Lee, D. B. Sanders, Caitlin M. Casey, N. Z. Scoville, Chao-Ling Hung, Emeric Le Floc'h, Olivier Ilbert, Herve Aussel, Peter Capak, Jeyhan S. Kartaltepe, Isaac Roseboom, Mara Salvato, M. Aravena, J. Bock, S. J. Oliver, L. Riguccini, M. Symeonidis

摘要:

我们将整个2 deg^2 COSMOS场的赫歇尔PACS和SPIRE图与现有的多波长数据相结合,获得了4,218个赫歇尔选择源的模板和模型无关的光学-远红外光谱能量分布(SED),log(L_IR/L_sun)= 9.4-13.6,z = 0.02-3.54。中位数SED是通过将COSMOS中可用的光学到远红外(FIR)波段合并为红外光度的函数而创建的。赫歇尔探测了大部分红外辐射发出的静止帧波长,使我们能够更准确地确定我们的红外发光星系样本的基本尘埃性质。研究发现,随着总红外光度(LIR)的增加,SED峰值波长(λ_peak)减小,尘埃质量(M_dust)增加。在红外光度最低的星系中(log(L_IR/L_sun)= 10.0-11.5),我们看到多环芳烃(PAH)特征的证据(λ =7-9微米),而在最高红外光度星系(L_IR > 10^12 L_sun)我们看到热尘埃和/或幂律辐射的贡献越来越大,这与来自活动星系核(AGN)的加热的存在是一致的。我们研究了红外发光星系样本的恒星质量与恒星形成率之间的关系,没有发现Herschel选择星系遵循以前光学选择恒星形成星系研究中确定的SFR/M_*“主序”的证据。最后,我们用先前定义的诊断公式IR 8 = L_IR / L_8比较了我们的红外发光星系的中红外(MIR)和远红外(FIR)特性,发现L_IR > 10^11.3 L_sun的星系倾向于系统地位于IR 8“红外主序”之上(~3-5),这表明PAH发射被抑制或活动星系核加热的贡献增加。

英文摘要:

We combine Herschel PACS and SPIRE maps of the full 2 deg^2 COSMOS field with existing multi-wavelength data to obtain template and model-independent optical-to-far-infrared spectral energy distributions (SEDs) for 4,218 Herschel-selected sources with log(L_IR/L_sun) = 9.4-13.6 and z = 0.02-3.54. Median SEDs are created by binning the optical to far-infrared (FIR) bands available in COSMOS as a function of infrared luminosity. Herschel probes rest-frame wavelengths where the bulk of the infrared radiation is emitted, allowing us to more accurately determine fundamental dust properties of our sample of infrared luminous galaxies. We find that the SED peak wavelength (lambda_peak) decreases and the dust mass (M_dust) increases with increasing total infrared luminosity (L_IR). In the lowest infrared luminosity galaxies (log(L_IR/L_sun) = 10.0-11.5), we see evidence of Polycyclic Aromatic Hydrocarbons (PAH) features (lambda=7-9 um), while in the highest infrared luminosity galaxies (L_IR > 10^12 L_sun) we see an increasing contribution of hot dust and/or power-law emission, consistent with the presence of heating from an active galactic nucleus (AGN). We study the relationship between stellar mass and star formation rate of our sample of infrared luminous galaxies and find no evidence that Herschel-selected galaxies follow the SFR/M_* "main sequence" as previously determined from studies of optically selected, star-forming galaxies. Finally, we compare the mid-infrared (MIR) to FIR properties of our infrared luminous galaxies using the previously defined diagnostic, IR8 = L_IR / L_8, and find that galaxies with L_IR > 10^11.3 L_sun tend to systematically lie above (~3-5) the IR8 "infrared main sequence", suggesting either suppressed PAH emission or an increasing contribution from AGN heating.

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