Apparent double SiO maser sources

Shuji Deguchi; Takahiro Fujii; Hideyuki Izumiura; Shigeru Matsumoto; Yoshikazu Nakada; Peter R. Wood; Issei Yamamura

doi:10.1093/pasj/51.3.355

Apparent double SiO maser sources

Shuji Deguchi^*, Takahiro Fujii, Hideyuki Izumiura, Shigeru Matsumoto, Yoshikazu Nakada, Peter R. Wood, Issei Yamamura

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

7 Citations (Scopus)

Abstract

During the course of a SiO maser survey of galactic disk IRAS sources at 43 GHz, we found two cases of doubly peaked SiO maser sources in the 40″ half-power beam of the Nobeyama 45-m telescope. The double peaks in the spectra of these sources (IRAS 18019-1822 and 18465-0717) have velocity separations of 73 and 147 km s^-1, indicating that each peak comes from a separate source. Infrared imaging observations found pairs of candidate counterparts for each source with angular separations of about 20″. Combining the observational data, we conclude that these objects are apparent-double SiO sources, which are by chance seen in the same direction. The discovery rate for pairs of SiO maser sources in a single telescope beam is found to be consistent with the surface density of SiO maser sources in the galactic disk. These sources can be used to measure the parallaxes and proper motions with VLBI in the future.

Original language	English
Pages (from-to)	355-361
Number of pages	7
Journal	Publication of the Astronomical Society of Japan
Volume	51
Issue number	3
DOIs	https://doi.org/10.1093/pasj/51.3.355
Publication status	Published - 1999

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title = "Apparent double SiO maser sources",

abstract = "During the course of a SiO maser survey of galactic disk IRAS sources at 43 GHz, we found two cases of doubly peaked SiO maser sources in the 40″ half-power beam of the Nobeyama 45-m telescope. The double peaks in the spectra of these sources (IRAS 18019-1822 and 18465-0717) have velocity separations of 73 and 147 km s-1, indicating that each peak comes from a separate source. Infrared imaging observations found pairs of candidate counterparts for each source with angular separations of about 20″. Combining the observational data, we conclude that these objects are apparent-double SiO sources, which are by chance seen in the same direction. The discovery rate for pairs of SiO maser sources in a single telescope beam is found to be consistent with the surface density of SiO maser sources in the galactic disk. These sources can be used to measure the parallaxes and proper motions with VLBI in the future.",

keywords = "Infrared: Sources, Masers, Stars: Long-period variables",

author = "Shuji Deguchi and Takahiro Fujii and Hideyuki Izumiura and Shigeru Matsumoto and Yoshikazu Nakada and Wood, {Peter R.} and Issei Yamamura",

year = "1999",

doi = "10.1093/pasj/51.3.355",

language = "English",

volume = "51",

pages = "355--361",

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issn = "0004-6264",

publisher = "Oxford University Press ",

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TY - JOUR

T1 - Apparent double SiO maser sources

AU - Deguchi, Shuji

AU - Fujii, Takahiro

AU - Izumiura, Hideyuki

AU - Matsumoto, Shigeru

AU - Nakada, Yoshikazu

AU - Wood, Peter R.

AU - Yamamura, Issei

PY - 1999

Y1 - 1999

N2 - During the course of a SiO maser survey of galactic disk IRAS sources at 43 GHz, we found two cases of doubly peaked SiO maser sources in the 40″ half-power beam of the Nobeyama 45-m telescope. The double peaks in the spectra of these sources (IRAS 18019-1822 and 18465-0717) have velocity separations of 73 and 147 km s-1, indicating that each peak comes from a separate source. Infrared imaging observations found pairs of candidate counterparts for each source with angular separations of about 20″. Combining the observational data, we conclude that these objects are apparent-double SiO sources, which are by chance seen in the same direction. The discovery rate for pairs of SiO maser sources in a single telescope beam is found to be consistent with the surface density of SiO maser sources in the galactic disk. These sources can be used to measure the parallaxes and proper motions with VLBI in the future.

AB - During the course of a SiO maser survey of galactic disk IRAS sources at 43 GHz, we found two cases of doubly peaked SiO maser sources in the 40″ half-power beam of the Nobeyama 45-m telescope. The double peaks in the spectra of these sources (IRAS 18019-1822 and 18465-0717) have velocity separations of 73 and 147 km s-1, indicating that each peak comes from a separate source. Infrared imaging observations found pairs of candidate counterparts for each source with angular separations of about 20″. Combining the observational data, we conclude that these objects are apparent-double SiO sources, which are by chance seen in the same direction. The discovery rate for pairs of SiO maser sources in a single telescope beam is found to be consistent with the surface density of SiO maser sources in the galactic disk. These sources can be used to measure the parallaxes and proper motions with VLBI in the future.

KW - Infrared: Sources

KW - Masers

KW - Stars: Long-period variables

UR - http://www.scopus.com/inward/record.url?scp=0033241575&partnerID=8YFLogxK

U2 - 10.1093/pasj/51.3.355

DO - 10.1093/pasj/51.3.355

M3 - Article

SN - 0004-6264

VL - 51

SP - 355

EP - 361

JO - Publication of the Astronomical Society of Japan

JF - Publication of the Astronomical Society of Japan

IS - 3

ER -

Apparent double SiO maser sources

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