THE MEGAMASER COSMOLOGY PROJECT. VIII. A GEOMETRIC DISTANCE TO NGC 5765b
文献类型：期刊论文
| 作者 | Gao, F.7,8,9; Braatz, J. A.8; Reid, M. J.1; Lo, K. Y.8; Condon, J. J.8; Henkel, C.5,6; Kuo, C. Y.4; Impellizzeri, C. M. V.3,8; Pesce, D. W.2; Zhao, W.9
|
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2016-02-01 |
| 卷号 | 817期号:2 |
| 关键词 | Cosmological Parameters Dark Energy Distance Scale Galaxies: Individual (Ngc 5765b) Galaxies: Nuclei Masers |
| ISSN号 | 0004-637X |
| DOI | 10.3847/0004-637X/817/2/128 |
| 英文摘要 | As part of the Megamaser Cosmology Project, here we present a new geometric distance measurement to the megamaser galaxy NGC 5765b. Through a series of very long baseline interferometry observations, we have confirmed the water masers trace a thin, sub-parsec Keplerian disk around the nucleus, implying an enclosed mass of 4.55 +/- 0.40 x 10(7) M-circle dot. Meanwhile, from single-dish monitoring of the maser spectra over two years, we measured the secular drifts of maser features near the systemic velocity of the galaxy with rates between 0.5 and 1.2 km s(-1) yr(-1). Fitting a warped, thin-disk model to these measurements, we determine a Hubble Constant H-0 of 66.0 +/- 6.0 km s(-1) Mpc(-1) with an. angular-diameter distance to NGC 5765b of 126.3 +/- 11.6 Mpc. Apart from the distance measurement, we also investigate some physical properties related to the maser disk in NGC 5765b. The high-velocity features are spatially distributed into several clumps, which may indicate the existence of a spiral density wave associated with the accretion disk. For the redshifted features, the envelope defined by the peak maser intensities increases with radius. The profile of the systemic masers in NGC 5765b is smooth and shows almost no structural changes over the two years of monitoring time, which differs from the more variable case of NGC 4258. |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000369437900045 |
| 出版者 | IOP PUBLISHING LTD |
| 源URL | [http://119.78.226.72/handle/331011/32841]  |
| 专题 | 中国科学院上海天文台 |
| 通讯作者 | Gao, F. |
| 作者单位 | 1.Harvard Smithsonian Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA 2.Univ Virginia, Dept Astron, POB 400325, Charlottesville, VA 22904 USA 3.Joint Alma Off, Alsonso de Cordova 3107, Santiago, Chile 4.Acad Sinica, Inst Astron & Astrophys, POB 23-141, Taipei 10617, Taiwan 5.King Abdulaziz Univ, POB 80203, Jeddah 21413, Saudi Arabia 6.Max Planck Inst Radioastron, Hugel 69, D-53121 Bonn, Germany 7.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China 8.Natl Radio Astron Observ, 520 Edgemont Rd, Charlottesville, VA 22903 USA 9.Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R China |
| 推荐引用方式 GB/T 7714 | Gao, F.,Braatz, J. A.,Reid, M. J.,et al. THE MEGAMASER COSMOLOGY PROJECT. VIII. A GEOMETRIC DISTANCE TO NGC 5765b[J]. ASTROPHYSICAL JOURNAL,2016,817(2). |
| APA | Gao, F..,Braatz, J. A..,Reid, M. J..,Lo, K. Y..,Condon, J. J..,...&Zhao, W..(2016).THE MEGAMASER COSMOLOGY PROJECT. VIII. A GEOMETRIC DISTANCE TO NGC 5765b.ASTROPHYSICAL JOURNAL,817(2). |
| MLA | Gao, F.,et al."THE MEGAMASER COSMOLOGY PROJECT. VIII. A GEOMETRIC DISTANCE TO NGC 5765b".ASTROPHYSICAL JOURNAL 817.2(2016). |
入库方式： OAI收割
来源：上海天文台
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。