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THE SPATIOKINEMATICAL STRUCTURE OF H2O AND OH MASERS IN THE "WATER FOUNTAIN" SOURCE IRAS 18460−0151
http://hdl.handle.net/10232/26199
http://hdl.handle.net/10232/26199290eb1c7-d918-4763-8304-2cfef160db8a
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
The Spatiokinematical Structure of H2O and OH Masers in the Water Fountain Source IRAS 18460–0151.pdf (425.6 kB)
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| Item type | 学術雑誌論文 / Journal Article(1) | |||||
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| 公開日 | 2016-03-15 | |||||
| タイトル | ||||||
| タイトル | THE SPATIOKINEMATICAL STRUCTURE OF H2O AND OH MASERS IN THE "WATER FOUNTAIN" SOURCE IRAS 18460−0151 | |||||
| タイトル言語 | en | |||||
| 著者 |
今井, 裕
× 今井, 裕× 出口, 修至× 中島, 淳一× Kwok, Sun× Diamond, Philip J. |
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| 言語 | ||||||
| 言語 | eng | |||||
| キーワード | ||||||
| 主題言語 | en | |||||
| 主題Scheme | Other | |||||
| 主題 | masers -- stars | |||||
| キーワード | ||||||
| 主題言語 | en | |||||
| 主題Scheme | Other | |||||
| 主題 | AGB and post-AGB -- stars | |||||
| キーワード | ||||||
| 主題言語 | en | |||||
| 主題Scheme | Other | |||||
| 主題 | individual (IRAS 18460−0151) -- stars | |||||
| キーワード | ||||||
| 主題言語 | en | |||||
| 主題Scheme | Other | |||||
| 主題 | kinematics and dynamics -- stars | |||||
| キーワード | ||||||
| 主題言語 | en | |||||
| 主題Scheme | Other | |||||
| 主題 | mass-loss -- stars | |||||
| キーワード | ||||||
| 主題言語 | en | |||||
| 主題Scheme | Other | |||||
| 主題 | winds, outflows | |||||
| 資源タイプ | ||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
| 資源タイプ | journal article | |||||
| 要約 | ||||||
| 内容記述タイプ | Other | |||||
| 内容記述 | Using the Very Long Baseline Array and the European Very Long Baseline Interferometry Network, we have observed 22.2 GHz H2O and 1612 MHz OH masers in the water fountain source IRAS 18460-0151. The H2O maser spectrum has a very wide line-of-sight velocity range (≈310 km s^-1) and consists of three groups of emission features at the blueshifted (-68 km s^-1 ≲ V_LSR ≲ -17 km s^-1) and redshifted (V_LSR ≃ 240 km s^-1) edges as well as around the systemic velocity (112 km s^-1 ≃ V_LSR ≃ 133 km s^-1). The first two H2O spectral components exhibit a highly collimated high-velocity bipolar jet on the sky, with an angular separation of ≈120 milliarcsec (mas) (240 AU in linear length) and a three-dimensional flow velocity of ≈160 km s^-1. The flow dynamical age is estimated to be only ≈6 yr (at the time of the observation epochs of 2006–2007). Interestingly, the systemic velocity component clearly exhibits a spherically expanding outflow with a radius of ≈36 AU and a flow velocity of ≈9 km s^-1. On the other hand, the OH maser spectrum shows double peaks with a velocity separation of ≈25 km s^-1 (V_LSR = 111–116 and 138–141 km s^-1), as typically seen in circumstellar envelopes of OH/IR stars. The angular offset between the velocity-integrated brightness peaks of the two high-velocity H2O components is ≈25 mas (50 AU). The offset direction and the alignment of the redshifted maser spots are roughly perpendicular to the axis of the H2O maser flow. High-accuracy astrometry for the H2O and OH masers demonstrates that the collimated fast jet and the slowly expanding outflow originate from a single or multiple sources which are located within 15 mas (30 AU). On the other hand, the estimated systemic velocity of the collimated jet (V_sys ≈ 87–113 km s^-1) has a large uncertainty. This makes it difficult to provide strong constraints on models of the central stellar system of IRAS 18460-0151. | |||||
| 内容記述言語 | en | |||||
| 収録雑誌名 |
en : The Astronomical Journal 巻 773, 号 2, p. 182, 発行日 2013 |
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| 作成日 | ||||||
| 日付 | 2013-08-20 | |||||
| 日付タイプ | Issued | |||||
| ISSN | ||||||
| 収録物識別子タイプ | PISSN | |||||
| ISSN | 00046256 | |||||
| NII書誌ID（雑誌） | ||||||
| 収録物識別子タイプ | NCID | |||||
| NC ID | AA00552749 | |||||
| DOI | ||||||
| 識別子タイプ | DOI | |||||
| DOI | https://doi.org/10.1088/0004-637X/773/2/182 | |||||
| 権利 | ||||||
| 権利情報の言語 | en | |||||
| 権利情報 | American Astronomical Society | |||||
| 出版タイプ | ||||||
| 出版タイプ | VoR | |||||
| 出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||
| NDC | ||||||
| 主題Scheme | NDC | |||||
| 主題 | 440 | |||||
| 公開者・出版者 | ||||||
| 出版者 | American Astronomical Society/IOP Publishing | |||||
| 出版者言語 | en | |||||
