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J/PASJ/52/631       Galactic plane VERA survey         (Honma+, 2000)

J-net galactic-plane survey of VLBI radio sources for VLBI Exploration of Radio Astrometry (VERA) Honma M., Oyama T., Hachisuka K., Sawada-Satoh S., Sebata K., Miyoshi M., Kameya O., Manabe S., Kawaguchi N., Sasao T., Kameno S., Fujisawa K., Shibata K.M., Bushimata T., Miyaji T., Kobayashi H., Inoue M., Imai H., Araki H., Hanada H., Iwadate K., Kaneko Y., Kuji S., Sato K., Tsuruta S., Sakai S., Tamura Y., Horiai K., Hara T., Yokoyama K., Nakajima J., Kawai E., Okubo H., Osaki H., Koyama Y., Sekido M., Suzuyama T., Ichikawa R., Kondo T., Sakai K., Wada K., Harada N., Tougou N., Fujishita M., Shimizu R., Kawaguchi S., Yoshimura A., Nakamura M., Hasegawa W., Morisaki S., Kamohara R., Funaki T., Yamashita N., Watanabe T., Shimoikura T., Nishio M., Omodaka T., Okudaira A. <Publ. Astron. Soc. Jap., 52, 631 (2000)> =2000PASJ...52..631H
ADC_Keywords: Radio sources ; Galactic plane ; VLBI ; Surveys Keywords: galaxies: active - quasars: general - radio continuum: galaxies - radio continuum: stars - VERA Abstract: In order to search for new VLBI sources in the galactic plane that can be used as phase reference sources in differential VLBI, we conducted 22GHz observations of radio sources in the galactic plane using the Japanese VLBI Network (J-Net). We have observed 267 VLBI source candidates selected from existing radio surveys and have detected 93 sources at a signal-to-noise ratio larger than 5. While 42 of the 93 detected sources had already been detected with VLBI at relatively lower frequency (typically 2 to 8GHz), the remaining 51 are found to be new VLBI sources detected for the first time. These are located within |b|≤5°, and have a large number of galactic maser sources around them. Thus, they are potential candidates for phase reference sources for VLBI Exploration of Radio Astrometry (VERA), which is the first VLBI array dedicated to phase-referencing VLBI astrometry aimed at measuring the parallax and proper motion of maser sources in the whole Galaxy. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 69 284 List of 284 VLBI source candidates.
See also: I/251 : VLBI International Celestial Reference Frame (ICRF) (Ma+, 1997) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 12 A12 --- TXS Texas source name (TXS HHMM+DDd) 14- 15 I2 h RAh Right ascension (J2000) 17- 18 I2 min RAm Right ascension (J2000) 20- 26 F7.4 s RAs Right ascension (J2000) 28 A1 --- DE- Declination sign (J2000) 29- 30 I2 deg DEd Declination (J2000) 32- 33 I2 arcmin DEm Declination (J2000) 35- 40 F6.3 arcsec DEs Declination (J2000) 42- 47 F6.2 deg GLON Galactic longitude 49- 54 F6.2 deg GLAT Galactic latitude 56- 60 F5.1 --- S/N ? Signal-to-noise ratio with Nobeyama-Kashima baseline 62- 65 I4 mJy S22GHz ? Correlated flux density at 22GHz for Nobeyania-Kashinia baseline (1) 67- 69 A3 --- Note [IVM ] Note (2)
Note (1): The correlated flux density was calculated using S=[2kρ/ηc]*[(Tsys1*Tsys2)/ηe1ηe2_A1A2)]1/2 where ρ is the correlation coefficient, Tsys the system noise temperature, A the antenna temperature, ηe the antenna efficiency, k the Boltzmann constant and ηc the sampling efficiency. Note (2): Note as follows: I = source listed in ICRF catalog (Ma et al., 1998, Cat. I/251) V = source listed in VLBA calibrator source (Peck & Beasley, 1998, in Radio emission from Galactic and Extragalactic Compact Sources, IAU Colloquium 646, ASP Conf. Ser. 144, p. 155) M = source listed in 2 GHz VLBI survey (Morabito et al., 1986AJ.....91.1038M)
History: Prepared via OCR at CDS.
(End) James Marcout, Patricia Bauer [CDS] 06-Oct-2000
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