Apparent Double SiO Maser Sources

Publications of the Astronomical Society of Japan

Fujii, Takahiro²  Wood, Peter R.³  Yamamura, Issei⁴  Izumiura, Hideyuki⁶  Matsumoto, Shigeru²  Nakada, Yoshikazu¹  Deguchi, Shuji⁵ 

[1] Institute of Astronomy, The University of Tokyo, Mitaka, Tokyo 181-8588Kiso Observatory, Institute of Astronomy, The University of Tokyo, Mitake, Kiso, Nagano 397-0101;Department of Astronomy, The University of Tokyo, Bunkyo, Tokyo 113-0032Institute of Astronomy, The University of Tokyo, Mitaka, Tokyo 181-8588;Mount Stromlo and Siding Spring Observatoires, Private Bag, Weston Creek PO, Canberra, ACT 2611, Australia;Department of Astronomy, The University of Tokyo, Bunkyo, Tokyo 113-0032Institute of Astronomy, The University of Tokyo, Mitaka, Tokyo 181-8588Sterrenkundig Instituut “Anton Pannekoek„, Universiteit van Amsterdam, Kruislaan 403, 1098 SJ Amsterdam, The Netherlands;Nobeyama Radio Observatory, National Astronomical Observatory, Minamimaki, Minamisaku, Nagano 384-1305;Okayama Astrophysical Observatory, National Astronomical Observatory, Kamogata, Asakuchi, Okayama 719-0200

关键词: "Infrared: sources";    Masers;    "Stars: long-period variables";   

DOI  :  10.1093/pasj/51.3.355

学科分类：天文学(综合)

来源: Oxford University Press

【 摘 要 】

DuringthecourseofaSiOmasersurveyofgalacticdiskIRASsourcesat43GHz,wefoundtwocasesofdoublypeakedSiOmasersourcesinthe40″half-powerbeamoftheNobeyama45-mtelescope.Thedoublepeaksinthespectraofthesesources(IRAS18019-1822and18465-0717)havevelocityseparationsof73and147kms−1,indicatingthateachpeakcomesfromaseparatesource.Infraredimagingobservationsfoundpairsofcandidatecounterpartsforeachsourcewithangularseparationsofabout20″.Combiningtheobservationaldata,weconcludethattheseobjectsareapparent-doubleSiOsources,whicharebychanceseeninthesamedirection.ThediscoveryrateforpairsofSiOmasersourcesinasingletelescopebeamisfoundtobeconsistentwiththesurfacedensityofSiOmasersourcesinthegalacticdisk.ThesesourcescanbeusedtomeasuretheparallaxesandpropermotionswithVLBIinthefuture.

【 授权许可】

Unknown