YNAO OpenIR  > 大样本恒星演化研究组
INFRARED SPECTRAL ENERGY DISTRIBUTION DECOMPOSITION OF WISE-SELECTED, HYPERLUMINOUS HOT DUST-OBSCURED GALAXIES
Fan, Lulu1,2; Han YK(韩云坤)3; Nikutta, Robert4; Drouart, Guillaume2; Knudsen, Kirsten K.2; Fan, LL (reprint author), Shandong Univ, Inst Space Sci, Shandong Prov Key Lab Opt Astron & Solar Terr Env, Weihai 264209, Peoples R China
发表期刊ASTROPHYSICAL JOURNAL
2016-06-01
卷号823期号:2
DOI10.3847/0004-637X/823/2/107
产权排序第3完成单位
收录类别SCI
关键词Galaxies: Active Galaxies: Evolution Galaxies: Formation Galaxies: High-redshift Infrared: Galaxies
摘要We utilize a Bayesian approach to fit the observed mid-IR-to-submillimeter/millimeter spectral energy distributions (SEDs) of 22 WISE-selected and submillimeter-detected, hyperluminous hot dust-obscured galaxies (Hot DOGs), with spectroscopic redshift ranging from 1.7 to 4.6. We compare the Bayesian evidence of a torus plusgraybody (Torus+GB) model with that of a torus-only (Torus) model and find that the Torus+GB model has higher Bayesian evidence for all 22 Hot DOGs than the torus-only model, which presents strong evidence in favor of the Torus+GB model. By adopting the Torus+GB model, we decompose the observed IR SEDs of Hot DOGs into torus and cold dust components. The main results are as follows. (1) Hot DOGs in our submillimeter-detected sample are hyperluminous (L-IR >= 10(13) L-circle dot), with torus emission dominating the IR energy output. However, cold dust emission is non-negligible, contributing on average similar to 24% of total IR luminosity. (2) Compared to QSO and starburst SED templates, the median SED of Hot DOGs shows the highest luminosity ratio between mid-IR and submillimeter at rest frame, while it is very similar to that of QSOs at similar to 10-50 mu m, suggesting that the heating sources of Hot DOGs should be buried AGNs. (3) Hot DOGs have high dust temperatures (T-dust similar to 72 K) and high IR luminosity of cold dust. The T-dust-L-IR relation of Hot DOGs suggests that the increase in IR luminosity for Hot DOGs is mostly due to the increase of the dust temperature, rather than dust mass. Hot DOGs have lower dust masses than submillimeter galaxies (SMGs) and QSOs within a similar redshift range. Both high IR luminosity of cold dust and relatively low dust mass in Hot DOGs can be expected by their relatively high dust temperatures. (4) Hot DOGs have high dust-covering factors (CFs), which deviate from the previously proposed trend of the dust CF decreasing with increasing bolometric luminosity. Finally, we can reproduce the observed properties in Hot DOGs by employing a physical model of galaxy evolution. This result suggests that Hot DOGs may lie at or close to peaks of both star formation and black hole growth histories, and represent a transit phase during the evolutions of massive galaxies, transforming them from the dusty starburst-dominated phase to the optically bright QSO phase.
项目资助者National Natural Science Foundation of China (NSFC)(11203023, 11303084, 11433005) ; Fundamental Research Funds for the Central Universities(WK3440000001) ; Shandong University ; Knut and Alice Wallenberg Foundation ; Western Light Youth Project ; FONDECYT(3140436)
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN0004-637X
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WOS记录号WOS:000377410000038
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]ACTIVE GALACTIC NUCLEI ; SUPERMASSIVE BLACK-HOLES ; HIGH-REDSHIFT GALAXIES ; SIMILAR-TO 2 ; STAR-FORMING GALAXIES ; MU-M OBSERVATIONS ; DEEP FIELD-SOUTH ; GREATER-THAN 5 ; SUBMILLIMETER GALAXIES ; X-RAY
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被引频次:15[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/9608
专题大样本恒星演化研究组
通讯作者Fan, LL (reprint author), Shandong Univ, Inst Space Sci, Shandong Prov Key Lab Opt Astron & Solar Terr Env, Weihai 264209, Peoples R China
作者单位1.Shandong Provincial Key Lab of Optical Astronomy and Solar-Terrestrial Environment, Institute of Space Science, Shandong University, Weihai, 264209, China
2.Department of Earth and Space Sciences, Chalmers University of Technology, Onsala Space Observatory, SE-439 92 Onsala, Sweden
3.Yunnan Observatories, Chinese Academy of Sciences, Kunming, 650011, China
4.Instituto de Astrofísica, Facultad de Física, Pontificia Universidad Católica de Chile, 306, Santiago 22, Chile
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Fan, Lulu,Han YK,Nikutta, Robert,et al. INFRARED SPECTRAL ENERGY DISTRIBUTION DECOMPOSITION OF WISE-SELECTED, HYPERLUMINOUS HOT DUST-OBSCURED GALAXIES[J]. ASTROPHYSICAL JOURNAL,2016,823(2).
APA Fan, Lulu,Han YK,Nikutta, Robert,Drouart, Guillaume,Knudsen, Kirsten K.,&Fan, LL .(2016).INFRARED SPECTRAL ENERGY DISTRIBUTION DECOMPOSITION OF WISE-SELECTED, HYPERLUMINOUS HOT DUST-OBSCURED GALAXIES.ASTROPHYSICAL JOURNAL,823(2).
MLA Fan, Lulu,et al."INFRARED SPECTRAL ENERGY DISTRIBUTION DECOMPOSITION OF WISE-SELECTED, HYPERLUMINOUS HOT DUST-OBSCURED GALAXIES".ASTROPHYSICAL JOURNAL 823.2(2016).
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