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DISTANCE AND PROPER MOTION MEASUREMENT OF WATER MASERS IN SHARPLESS 269 IRS 2w
http://hdl.handle.net/10232/26219
http://hdl.handle.net/10232/262196940ab60-dcd6-4355-9d5b-78722f28adc5
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
Distance and Proper Motion Measurement of Water Masers in Sharpless 269 IRS 2w.pdf (782.5 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 | DISTANCE AND PROPER MOTION MEASUREMENT OF WATER MASERS IN SHARPLESS 269 IRS 2w | |||||
| タイトル言語 | en | |||||
| 著者 |
朝木, 義晴
× 朝木, 義晴× 今井, 裕× Sobolev, A. M.× Parfenov, S. Yu. |
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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 | Galaxy | |||||
| キーワード | ||||||
| 主題言語 | en | |||||
| 主題Scheme | Other | |||||
| 主題 | kinematics and dynamics –- Galaxy | |||||
| キーワード | ||||||
| 主題言語 | en | |||||
| 主題Scheme | Other | |||||
| 主題 | structure –- masers –- stars | |||||
| キーワード | ||||||
| 主題言語 | en | |||||
| 主題Scheme | Other | |||||
| 主題 | formation | |||||
| 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 | We present astrometric analysis of archival data of water masers in the star-forming region Sharpless 269 (S269) IRS 2w, observed with the VLBI Exploration of Radio Astrometry. An annual parallax of one of the bright maser features in this region was previously reported to be 0.189 ± 0.008 milliarcsecond (mas) using part of the same archival data as we used. However, we found that this maser feature is not the best to represent the annual parallax to S269 IRS 2w because the morphology is remarkably elongated in the east–west direction. For this study we have selected another maser feature showing simpler morphology. This makes the new annual parallax estimate more credible. Our newly obtained annual parallax is 0.247 ± 0.034 mas, corresponding to 4.05[+0.65 -0.49] kpc. This value is well consistent with the 3.7–3.8 kpc obtained using the kinematic distance estimates and photometric distance modulus. We considered two hypotheses for the water-maser spatial distribution, a bipolar outflow and an expanding ring, in a kinematic model fitting analysis with a radially expanding flow. At this stage, any conclusions about the systemic proper motion could not be drawn from the kinematic analysis. Alternatively, we evaluated the mean proper motion to be (0.39 ± 0.92, -1.27 ± 0.90) mas yr^-1 eastward and northward, respectively, from the obtained proper motions of the detected water-maser features. The newly obtained annual parallax and mean proper motion give the peculiar motion of S269 IRS 2w to be (U_s, V_s, W_s) of (8 ± 6, -21 ± 17, 1 ± 18) km s^-1. | |||||
| 内容記述言語 | en | |||||
| 収録雑誌名 |
en : The Astronomical Journal 巻 787, 号 1, p. 54, 発行日 2014 |
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| 作成日 | ||||||
| 日付 | 2014-05-20 | |||||
| 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/787/1/54 | |||||
| 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 | |||||
