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Radio-loud narrow-line type 1 Quasars
文献类型：期刊论文
| 作者 | Komossa, Stefanie; Voges, Wolfgang; Xu, Dawei ; Mathur, Smita; Adorf, Hans-Martin; Lemson, Gerard; Duschl, Wolfgang J.; Grupe, Dirk
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| 刊名 | ASTRONOMICAL JOURNAL
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| 出版日期 | 2006-08-01 |
| 卷号 | 132期号:2页码:531-545 |
| 关键词 | quasars : emission lines quasars : general quasars : individual (TEX 11111+329, SDSS J094857.3+002225 SDSS J172206.03+565451.6, RX J0134-4258, IRAS 09426+1929, SBS 1517+520, RX J16290+4007, PKS 0558-504 2E 1346+2637, IRAS 20181-2244, RX J23149+2243) radio continuum : galaxies X-rays : galaxies |
| 英文摘要 | We present the first systematic study of (non-radio-selected) radio-loud narrow-line Seyfert 1 (NLS1) galaxies. Cross-correlation of the Catalogue of Quasars and Active Nuclei with several radio and optical catalogs led to the identification of similar to 11 radio-loud NLS1 candidates, including four previously known ones. This study almost triples the number of known radio-loud NLS1 galaxies if all candidates are confirmed. Most of the radio-loud NLS1 galaxies are compact, steep-spectrum sources accreting close to or above the Eddington limit. The radio-loud NLS1 galaxies of our sample are remarkable in that they occupy a previously rarely populated regime in NLS1 multiwavelength parameter space. While their [O(III)]/H beta and Fe(II)/H beta intensity ratios almost cover the whole range observed in NLS1 galaxies, their radio properties extend the range of radio-loud objects to those with small widths of the broad Balmer lines. Their black hole masses are generally at the upper observed end among NLS1 galaxies but are still unusually small in view of the radio loudness of the sources. Among the radio-detected NLS1 galaxies, the radio index R is distributed quite smoothly up to the critical value of R similar or equal to 10 and covers about 4 orders of magnitude in total. Statistics show that similar to 7% of the NLS1 galaxies are formally radio-loud, while only 2.5% exceed a radio index R > 100. Implications for NLS1 models are discussed. Several mechanisms are considered as explanations for the radio loudness of the NLS1 galaxies and for the lower frequency of radio-loud galaxies among NLS1 galaxies than among quasars. While properties of most sources (with two to three exceptions) generally do not favor relativistic beaming, the combination of accretion mode and spin may explain the observations. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000239702500008 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/7066]  |
| 专题 | 国家天文台_空间科学研究部 |
| 作者单位 | 1.Max Planck Inst Extraterr Phys, D-85741 Garching, Germany 2.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 3.Ohio State Univ, Dept Astron, Columbus, OH 43210 USA 4.Max Planck Inst Astrophys, D-85748 Garching, Germany 5.Inst Theoret Astrophys, D-69120 Heidelberg, Germany 6.Univ Arizona, Steward Observ, Tucson, AZ 85721 USA 7.Penn State Univ, Astron Dept, Davey Lab 525, University Pk, PA 16802 USA |
| 推荐引用方式 GB/T 7714 | Komossa, Stefanie,Voges, Wolfgang,Xu, Dawei,et al. Radio-loud narrow-line type 1 Quasars[J]. ASTRONOMICAL JOURNAL,2006,132(2):531-545. |
| APA | Komossa, Stefanie.,Voges, Wolfgang.,Xu, Dawei.,Mathur, Smita.,Adorf, Hans-Martin.,...&Grupe, Dirk.(2006).Radio-loud narrow-line type 1 Quasars.ASTRONOMICAL JOURNAL,132(2),531-545. |
| MLA | Komossa, Stefanie,et al."Radio-loud narrow-line type 1 Quasars".ASTRONOMICAL JOURNAL 132.2(2006):531-545. |
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来源：国家天文台
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