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 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 1986AJ.....91.1038M)
--------------------------------------------------------------------------------
History:
Prepared via OCR at CDS.
(End) James Marcout, Patricia Bauer [CDS] 06-Oct-2000