Investigating Cold Dust Properties of 12 Nearby Dwarf Irregular Galaxies by Hierarchical Bayesian Spectral Energy Distribution Fitting
文献类型：期刊论文
| 作者 | Chang, Zhengxue9,10 ; Zhou, Jianjun8,10; Lamperti, Isabella5,6,7; Saintongel, Amelie7; Esimbek, Jarken8,10; Li, Dalei8,10; He, Yuxin8,10; Qiu, Jianjie4; Li, Jun9,10; Zhou, Zeming3
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| 刊名 | Astrophysical Journal
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| 出版日期 | 2021-07-01 |
| 卷号 | 915期号:1页码:51 |
| 关键词 | interstellar-medium infrared-emission spinning dust separation continuum i. photometry masses noise model Astronomy & Astrophysics |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/abfe67 |
| 产权排序 | 1 |
| 文献子类 | Article |
| 英文摘要 | Combining infrared and submillimeter observations and applying a two-temperature modified blackbody (TMBB) model with a hierarchical Bayesian technique, we model the spectral energy distribution of 12 nearby dwarf irregular (dIrr) galaxies. We aim to probe potential submillimeter excess emission at 350, 500, and 850 mu m and investigate the properties of cold dust parameters. Based on the TMBB model with cold dust emissivity index (beta (c)) fixed to 2, one galaxy shows 500 mu m excess emission and nine galaxies show excess at 850 mu m (five of them still show 850 mu m excess in the case of free beta (c)). We find that the 850 mu m excess emission is easily detected in the dIrr galaxies with low star formation activity. The 850 mu m excess is more frequent and more prominent in dIrr galaxies with low molecular hydrogen gas mass fraction or low ratios between cold dust mass and gas mass. As galaxies evolve, the ratios between atomic hydrogen gas mass and stellar mass decrease and the 850 mu m excess emission tends to decrease or even disappear. Our results suggest that the cold dust temperature may increase, as the dIrr galaxies have more intense star formation or richer metallicity. There is a weak anticorrelation between the cold dust-to-stellar mass ratio and the specific star formation rate for our galaxies. |
| URL标识 | 查看原文 |
| 语种 | 英语 |
| WOS记录号 | WOS:000669655000001 |
| 源URL | [http://ir.xao.ac.cn/handle/45760611-7/4706]  |
| 专题 | 恒星形成与演化研究团组 |
| 作者单位 | 1.School of Physics and Electronic Information, Shangrao Normal University, 401 Zhimin Road, Shangrao 334001, People’s Republic of China 2.Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany; 3.Department of Astronomy, Beijing Normal University, Beijing, 100875, Peopleʼs Republic of China; 4.School of Physics and Astronomy, Sun Yat-sen University, 2 Da Xue Road, Tangjia, Zhuhai 519000, Guangdong Province, People’s Republic of China; 5.Centro de Astrobiología (CSIC-INTA), Ctra. de Ajalvir, Km 4, E-28850, Torrejón de Ardoz, Madrid, Spain; 6.European Southern Observatory, Karl-Schwarzschild-Strasse 2, D-85748 Garching bei München, Germany; 7.Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, UK; 8.Key Laboratory of Radio Astronomy, Chinese Academy of Sciences 150 Science 1-Street, Urumqi, Xinjiang 830011, Peopleʼs Republic of China; 9.University of Chinese Academy of Sciences, No.19A Yuquan Road, Shijingshan District, Beijing, 100049, Peopleʼs Republic of China; 10.Xinjiang Astronomical Observatory, Chinese Academy of Sciences, 150 Science 1-Street, Urumqi, Xinjiang 830011, Peopleʼs Republic of China; |
| 推荐引用方式 GB/T 7714 | Chang, Zhengxue,Zhou, Jianjun,Lamperti, Isabella,et al. Investigating Cold Dust Properties of 12 Nearby Dwarf Irregular Galaxies by Hierarchical Bayesian Spectral Energy Distribution Fitting[J]. Astrophysical Journal,2021,915(1):51. |
| APA | Chang, Zhengxue.,Zhou, Jianjun.,Lamperti, Isabella.,Saintongel, Amelie.,Esimbek, Jarken.,...&Zhou, Minhua.(2021).Investigating Cold Dust Properties of 12 Nearby Dwarf Irregular Galaxies by Hierarchical Bayesian Spectral Energy Distribution Fitting.Astrophysical Journal,915(1),51. |
| MLA | Chang, Zhengxue,et al."Investigating Cold Dust Properties of 12 Nearby Dwarf Irregular Galaxies by Hierarchical Bayesian Spectral Energy Distribution Fitting".Astrophysical Journal 915.1(2021):51. |
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