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
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:
FileName Lrecl Records Explanations
ReadMe 80 . This file table3.dat 74 66 List of galaxy/quasar counterparts to the WJN radio transients
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
Bytes Format Units Label Explanations
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
Note (1): WJN J0445+4130 and J1043+4130 are reported by Matsumura et al. 2007AJ....133.1441M; WJN J0645+3200 and J1039+3200 are reported by Kida et al. 2008NewA...13..519K; WJN J1443+3439 is reported by Niinuma et al. 2007ApJ...657L..37N and WJN J1737+3808 by Kuniyoshi et al. 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).
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
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