Astrometry of H$_2$O Masers in Nearby Star-Forming Regions with VERA I. IRAS 16293$-$2422 in $\rho$ Oph East
Hiroshi Imai,Kohichiro Nakashima,Takeshi Bushimata,Yoon Kyung Choi,Tomoya Hirota,Mareki Honma,K. Horiai,Noritomo Inomata,Kenzaburo Iwadate,Takaaki Jike,Osamu Kameya,Ryuichi Kamohara,Yukitoshi Kan-ya,Noriyuki Kawaguchi,Masachika Kijima,Hideyuki Kobayashi,Seisuke Kuji,Tomoharu Kurayama,Seiji Manabe,Takeshi Miyaji,Takumi Nagayama,Akiharu Nakagawa,Chung Sik Oh,Toshihiro Omodaka,Tomoaki Oyama,Satoshi Sakai,Sei-ichiro Sakakibara,Katsuhisa Sato,Tetsuo Sasao,Tetsuo Sasao,Katsunori M. Shibata,Rie Shimizu,Motonobu Shintani,Yoshiaki Sofue,Kasumi Sora,Hiroshi Suda,Yoshiaki Tamura,Miyuki Tsushima,Yuji Ueno,Kazuyoshi Yamashita +39 more
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TLDR
In this paper, the authors reported on results of multi-epoch VLBI observations of H2O masers associated with a low-mass young stellar object, IRAS 16293 2422 in Oph East, and a fringe-phase and position reference source, ICRF J162546.8 252738.Abstract:
We report on results of multi-epoch VLBI observations of H2O masers associated with a low-mass young stellar object, IRAS 16293 2422 in Oph East, and a fringe-phase and position reference source, ICRF J162546.8 252738, using the VLBI Exploration of Radio Astrometry (VERA) for high-precision astrometry. We obtained an annual parallax of a maser feature to be = 5.6 0:5 mas, corresponding to a distance of D= 178 +18 37 pc. We also found 10 relative proper motions of maser features with respect to the maser feature mentioned above. The motion of the accompanying young stellar object (YSO) has already been found in thermal continuum emission previously observed with the Very Large Array. The intrinsic motions of masers have been estimated from the relative proper motions after the YSO’s motion is subtracted from, and a systemic secular motion of the position reference feature is added to the proper motions originally measured. The intrinsic maser kinematical structure may trace a bipolar outflow.read more
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Journal ArticleDOI
Astrometry of H2O Masers in Nearby Star-Forming Regions with VERA II SVS 13 in NGC 1333
Tomoya Hirota,Takeshi Bushimata,Yoon Kyung Choi,Mareki Honma,Hiroshi Imai,Kenzaburo Iwadate,Takaaki Jike,Osamu Kameya,Ryuichi Kamohara,Yukitoshi Kan-ya,Noriyuki Kawaguchi,Masachika Kijima,Hideyuki Kobayashi,Seisuke Kuji,Tomoharu Kurayama,Seiji Manabe,Takeshi Miyaji,Takumi Nagayama,Akiharu Nakagawa,Chung Sik Oh,Toshihiro Omodaka,Tomoaki Oyama,Satoshi Sakai,Tetsuo Sasao,Tetsuo Sasao,Katsuhisa Sato,Katsunori M. Shibata,Yoshiaki Tamura,Kazuyoshi Yamashita +28 more
TL;DR: In this article, the authors measured the annual parallax of the maser features in SVS 13 of 4.25 ˙ 0.32 mas, corresponding to a distance of 235 ˘ 18 pc from the Sun.
Journal ArticleDOI
A triple protostar system formed via fragmentation of a gravitationally unstable disk
John J. Tobin,John J. Tobin,Kaitlin M. Kratter,Magnus Persson,Magnus Persson,Leslie W. Looney,Michael M. Dunham,Dominique Segura-Cox,Zhi-Yun Li,Claire J. Chandler,Sarah Sadavoy,Robert J. Harris,Carl Melis,Laura M. Pérez +13 more
TL;DR: Observations of dust and molecular gas emission reveal a disk with a spiral structure surrounding the three protostars in the triple protostar system L1448 IRS3B that appears susceptible to disk fragmentation at radii between 150 and 320 astronomical units, consistent with models for a protostellar disk that has recently undergone gravitational instability, spawning one or two companion stars.
Journal ArticleDOI
SiO Maser Observations toward Orion-KL with VERA
Mi Kyoung Kim,Tomoya Hirota,Mareki Honma,Hideyuki Kobayashi,Takeshi Bushimata,Yoon Kyung Choi,Hiroshi Imai,Kenzaburo Iwadate,Takaaki Jike,Seiji Kameno,Osamu Kameya,Ryuichi Kamohara,Yukitoshi Kan-ya,Noriyuki Kawaguchi,Seisuke Kuji,Tomoharu Kurayama,Seiji Manabe,Makoto Matsui,Naoko Matsumoto,Takeshi Miyaji,Takumi Nagayama,Akiharu Nakagawa,Chung Sik Oh,Toshihiro Omodaka,Tomoaki Oyama,Satoshi Sakai,Tetsuo Sasao,Katsuhisa Sato,Mayumi Sato,Katsunori M. Shibata,Yoshiaki Tamura,Kazuyoshi Yamashita +31 more
TL;DR: In this article, the authors derived the trigonometric parallax of Orion-KL to be 2.39˙0.03mas, corresponding to a distance of 418˙6pc.
Journal ArticleDOI
Fundamental Parameters of the Milky Way Galaxy Based on VLBI Astrometry
Mareki Honma,Takumi Nagayama,Kazuma Ando,Takeshi Bushimata,Y. K. Choi,Toshihiro Handa,Tomoya Hirota,Hiroshi Imai,Takaaki Jike,Mi Kyoung Kim,Osamu Kameya,Noriyuki Kawaguchi,Hideyuki Kobayashi,Hideyuki Kobayashi,Tomoharu Kurayama,Tomoharu Kurayama,Seisuke Kuji,Naoko Matsumoto,Seiji Manabe,Takeshi Miyaji,Kazuhito Motogi,Akiharu Nakagawa,Hiroyuki Nakanishi,Kotaro Niinuma,Chung Sik Oh,Toshihiro Omodaka,Tomoaki Oyama,Nobuyuki Sakai,Katsuhisa Sato,Mayumi Sato,Katsunori M. Shibata,Satoshi Shiozaki,Kazuyoshi Sunada,Yoshiaki Tamura,Yuji Ueno,Aya Yamauchi +35 more
TL;DR: In this article, the fundamental parameters of the Galaxy were determined based on VLBI astrometry of 52 Galactic maser sources obtained with VERA, VLBA, and EVN.
Journal ArticleDOI
Misalignment of Magnetic Fields and Outflows in Protostellar Cores
Charles L. H. Hull,Richard L. Plambeck,Alberto D. Bolatto,Geoffrey C. Bower,John M. Carpenter,Richard M. Crutcher,Jason Fiege,Erica Franzmann,Nicholas S. Hakobian,Carl Heiles,Martin Houde,Martin Houde,A. Meredith Hughes,A. Meredith Hughes,Katherine Jameson,Woojin Kwon,James W. Lamb,Leslie W. Looney,Leslie W. Looney,Brenda C. Matthews,Brenda C. Matthews,Lee G. Mundy,Thushara Pillai,Marc W. Pound,Ian W. Stephens,John J. Tobin,John E. Vaillancourt,Nikolaus H. Volgenau,Melvyn Wright +28 more
TL;DR: This paper showed that magnetic fields in protostellar cores on scales of ~1000 AU are not tightly aligned with outflows from the protostars, which is consistent with scenarios where outflows and magnetic fields are preferentially misaligned (perpendicular) or where they are randomly aligned.
References
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Journal ArticleDOI
Distance to Orion KL Measured with VERA
Tomoya Hirota,Takeshi Bushimata,Yoon Kyung Choi,Mareki Honma,Hiroshi Imai,Kenzaburo Iwadate,Takaaki Jike,Seiji Kameno,Osamu Kameya,Ryuichi Kamohara,Yukitoshi Kan-ya,Noriyuki Kawaguchi,Masachika Kijima,Mi Kyoung Kim,Hideyuki Kobayashi,Seisuke Kuji,Tomoharu Kurayama,Seiji Manabe,Kenta Maruyama,Makoto Matsui,Naoko Matsumoto,Takeshi Miyaji,Takumi Nagayama,Akiharu Nakagawa,Kayoko Nakamura,Chung Sik Oh,Toshihiro Omodaka,Tomoaki Oyama,Satoshi Sakai,Tetsuo Sasao,Tetsuo Sasao,Katsuhisa Sato,Mayumi Sato,Katsunori M. Shibata,Motonobu Shintani,Yoshiaki Tamura,Miyuki Tsushima,Kazuyoshi Yamashita +37 more
TL;DR: In this article, the authors presented the initial results of multiepoch VLBI observations of 22 GHz H2O masers in the Orion KL region with VERA (VLBI Exploration of Radio Astrometry).
Journal ArticleDOI
Water Maser Motions in W3(OH) and a Determination of Its Distance
K. Hachisuka,K. Hachisuka,Andreas Brunthaler,Andreas Brunthaler,Karl M. Menten,Mark J. Reid,Hiroshi Imai,Yoshiaki Hagiwara,Makoto Miyoshi,Shinji Horiuchi,Tetsuo Sasao +10 more
TL;DR: In this article, phase-referencing VLBA observations of H2O masers near the star-forming region W3(OH) to measure their parallax and absolute proper motions are reported.
Journal ArticleDOI
Iras 16293-2422: proper motions, jet precession, the hot core, and the unambiguous detection of infall
TL;DR: In this paper, the authors present high-resolution observations of the multiple protostellar system IRAS 16293-2422 using the Submillimeter Array (SMA) at 300 GHz and the Very Large Array (VLA) at frequencies from 1.5 to 43 GHz.
Journal ArticleDOI
Astrometry of Galactic Star-Forming Region Sharpless 269 with VERA : Parallax Measurements and Constraint on Outer Rotation Curve
Mareki Honma,Takeshi Bushimata,Yoon Kyung Choi,Tomoya Hirota,Hiroshi Imai,Kenzaburo Iwadate,Takaaki Jike,Osamu Kameya,Ryuichi Kamohara,Yukitoshi Kan-ya,Noriyuki Kawaguchi,Masachika Kijima,Hideyuki Kobayashi,Seisuke Kuji,Tomoharu Kurayama,Seiji Manabe,Takeshi Miyaji,Takumi Nagayama,Akiharu Nakagawa,Chung Sik Oh,Toshihiro Omodaka,Tomoaki Oyama,Satoshi Sakai,Katsuhisa Sato,Tetsuo Sasao,Katsunori M. Shibata,Motonobu Shintani,Hiroshi Suda,Yoshiaki Tamura,Miyuki Tsushima,Kazuyoshi Yamashita +30 more
TL;DR: In this article, a trigonometric parallax of 189 ˙ 8� was measured for H2O maser sources in the Galactic star-forming region Sharpless 269 (S269), corresponding to a source distance of 5:28 + 0:24 � 0:22 kpc.
Journal ArticleDOI
IRAS 16293-2422 : a very young binary system ?
TL;DR: In this paper, the authors present 4.5 × 2.5 resolution millimeter wavelength observations of the young far-infrared source IRAS 16293-2422 which resolve the continuum emission into two sources, MM 1 and MM 2, which may constitute a very young binary system with a projected separation of 840 AU.
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