HI absorption towards low-luminosity radio-loud active galactic nuclei of different accretion modes and WISE colours
文献类型：期刊论文
| 作者 | Chandola, Yogesh1; Saikia, D. J.2,3 |
| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
 |
| 出版日期 | 2017-02-11 |
| 卷号 | 465期号:1页码:997-1007 |
| 关键词 | galaxies: active galaxies: general galaxies: nuclei infrared: galaxies radio continuum: galaxies radio lines: galaxies. |
| 英文摘要 | HI absorption studies of active galaxies enable us to probe their circumnuclear regions and the general interstellar medium and study the supply of gas that may trigger nuclear activity. In this article, we investigate the dependence of the detection rate of HI absorption on the nature of radio galaxies based on their emission-line spectra and on the nature of host galaxies based on WISE colours and their radio structure, which may help us understand the different accretion modes. We find significant differences in the distributions of W2-W3 colour for sources with HI absorption detections and non-detections. We report a high detection rate of HI absorption in those galaxies with WISE infrared colours W2-W3 > 2, typical of gasrich systems, along with a compact radio structure. The HI detection rate for low-excitation radio galaxies ( LERGs) with W2-W3 > 2 and compact radio structure is high ( 70.6 +/- 20.4 per cent). In high-excitation radio galaxies ( HERGs), compact radio structure in the nuclear or circumnuclear region could give rise to absorption by gas in the dusty torus, in addition to gas in the interstellar medium. However, the higher specific star-formation rate ( sSFR) for LERGs with W2-W3 > 2 suggests that HI absorption may be largely due to star-forming gas in their hosts. LERGs with extended radio structure tend to have significantly lower values of W2-W3 compared with those with compact structure. Extended radio sources and those with W2-W3 < 2 have low H-I detection rates. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | DIGITAL SKY SURVEY ; EARLY-TYPE GALAXIES ; ADVECTION-DOMINATED ACCRETION ; INFRARED-SURVEY-EXPLORER ; STAR-FORMATION RATES ; BLACK-HOLES ; HOST GALAXIES ; I ABSORPTION ; ELLIPTIC GALAXIES ; ABSORBING GAS |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000393782000069 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/8293]  |
| 专题 | 国家天文台_射电天文研究部 |
| 作者单位 | 1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 2.State Univ, Cotton Coll, Panbazar 781001, Guwahati, India 3.TIFR, NCRA, Post Bag 3, Pune 411007, Maharashtra, India |
| 推荐引用方式 GB/T 7714 | Chandola, Yogesh,Saikia, D. J.. HI absorption towards low-luminosity radio-loud active galactic nuclei of different accretion modes and WISE colours[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2017,465(1):997-1007. |
| APA | Chandola, Yogesh,&Saikia, D. J..(2017).HI absorption towards low-luminosity radio-loud active galactic nuclei of different accretion modes and WISE colours.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,465(1),997-1007. |
| MLA | Chandola, Yogesh,et al."HI absorption towards low-luminosity radio-loud active galactic nuclei of different accretion modes and WISE colours".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 465.1(2017):997-1007. |
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来源：国家天文台
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