J/ApJ/704/652 Radio transients in a 1.4GHz drift-scan survey (Niinuma+, 2009)
Discovery of two radio transients at a high galactic latitude in a 1.4 GHz
drift-scan survey.
Niinuma K., Daishido T., Matsumura N., Takefuji K., Kuniyoshi M., Asuma K.,
Kida S., Tanaka T., Aoki T., Ishikawa S., Hirano K., Uehara H., Nakagawa S.
<Astrophys. J., 704, 652-660 (2009)>
=2009ApJ...704..652N 2009ApJ...704..652N
ADC_Keywords: Radio continuum ; QSOs ; Galaxies, radio ; Redshifts ;
Cross identifications ; Interferometry
Keywords: radio continuum: general - stars: variables: other -
techniques: interferometric
Abstract:
We report two new radio transients at high Galactic latitude,
WJN J0951+3300 (RA=09h51m22s±10s, DE=33°00'±0.4°,
b=50°54.2') and WJN J1039+3300 (RA=10h39m26s±10s,
DE=33°00'±0.4°, b=60°58.5'), which were detected by
interferometric drift-scan observations at 1.4GHz at the Waseda Nasu
Pulsar Observatory. WJN J0951+3300 was detected at 16:49:32UT on 2006
January 12 with the flux density of approximately 1760.5±265.9mJy,
and WJN J1039+3300 was detected at 17:13:32UT on 2006 January 18 with
the flux density of approximately 2242.5±228.7mJy. Both of them
lasted for a short duration (≤2 days). The possibility that the
distribution of the WJN radio transients is isotropic was suggested in
a previous study. Having re-evaluated the log N-log S relation with
the addition of the two new objects reported in this paper, we find
that the slope is consistent with a slope of -1.5 and the previous
result. Additionally, although there are several counterparts to WJN
radio transients, we found that one of the quasar counterparts within
the positional error of WJN J0951+3300 could be a radio-loud quasar.
We have discussed whether or not WJN J0951+3300 could be of this
quasar origin.
Description:
Since 2004, the laboratory at Waseda University has been conducting a
project at the Waseda Nasu Pulsar Observatory, located 160km north of
Tokyo. The observatory was designed to conduct wide-field surveys at
1.42GHz with Δν=20MHz, in order to search for radio
transients, unidentified variable radio sources, and unknown pulsars.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 74 66 List of galaxy/quasar counterparts to the WJN
radio transients
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See also:
V/134 : Atlas of Radio/X-ray associations (ARXA) (Flesch, 2010)
VIII/71 : The FIRST Survey Catalog, Version 03Apr11 (Becker+ 2003)
J/PASP/120/339 : Nasu Radio-Transient Search Project (Takefuji+, 2008)
J/AJ/127/1959 : 1.4GHz emission of KISS galaxies (Van Duyne+, 2004)
J/A+A/427/387 : QORG catalog of radio/X-ray sources (Flesch+, 2004)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- --- [WJN]
5- 14 A10 --- WJN WJN object name (JHHMM+DDMM) (8 sources) (1)
16- 39 A24 --- Name Counterpart name
41- 42 I2 h RAh Counterpart hour of right ascension (J2000)
44- 45 I2 min RAm Counterpart minute of right ascension (J2000)
47- 50 F4.1 s RAs Counterpart second of right ascension (J2000)
52 A1 --- DE- Sign of declination (J2000)
53- 54 I2 deg DEd Counterpart degree of declination (J2000)
56- 57 I2 arcmin DEm Counterpart arcminute of declination (J2000)
59- 60 I2 arcsec DEs Counterpart arcsecond of declination (J2000)
62- 64 A3 --- Type Object type (G or QSO)
65 A1 --- f_Type [cd] Questionable type (2)
67- 74 F8.6 --- z ? Redshift
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Note (1): WJN J0445+4130 and J1043+4130 are reported by Matsumura et al.
2007AJ....133.1441M 2007AJ....133.1441M; WJN J0645+3200 and J1039+3200 are reported by
Kida et al. 2008NewA...13..519K 2008NewA...13..519K; WJN J1443+3439 is reported by Niinuma
et al. 2007ApJ...657L..37N 2007ApJ...657L..37N and WJN J1737+3808 by Kuniyoshi et al.
2007PASP..119..122K 2007PASP..119..122K.
WJN J0951+3300 and J1039+3300 are from this paper.
Note (2): Flag as follows:
c = Unclassified source (75%: G, 20%: QSO) in Flesch & Hardcastle (2004,
Cat. J/A+A/427/387; obsoleted by Cat. V/134).
d = This source is classified as a QSO with the probability of 95% in Flesch
& Hardcastle (2004, Cat. J/A+A/427/387; obsoleted by Cat. V/134).
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History:
From electronic version of the journal
18-Dec-2011: Insert into VizieR
04-Apr-2012: Counterpart 2MASX J17365403+3746376 of object 63 corrected
for 2MASX J17365300+3814336 by CDS.
(End) Emmanuelle Perret [CDS] 10-Nov-2011