2014MNRAS.438..352B

Query : 2014MNRAS.438..352B

2014MNRAS.438..352B - Mon. Not. R. Astron. Soc., 438, 352-367 (2014/February-2)

A survey for transients and variables with the Murchison Widefield Array 32-tile prototype at 154MHz.

BELL M.E., MURPHY T., KAPLAN D.L., HANCOCK P., GAENSLER B.M., BANYER J., BANNISTER K., TROTT C., HURLEY-WALKER N., WAYTH R.B., MacQUART J.-P., ARCUS W., BARNES D., BERNARDI G., BOWMAN J.D., BRIGGS F., BUNTON J.D., CAPPALLO R.J., COREY B.E., DESHPANDE A., DESOUZA L., EMRICH D., GOEKE R., GREENHILL L.J., HAZELTON B.J., HERNE D., HEWITT J.N., JOHNSTON-HOLLITT M., KASPER J.C., KINCAID B.B., KOENIG R., KRATZENBERG E., LONSDALE C.J., LYNCH M.J., McWHIRTER S.R., MITCHELL D.A., MORALES M.F., MORGAN E., OBEROI D., ORD S.M., PATHIKULANGARA J., PRABU T., REMILLARD R.A., ROGERS A.E.E., ROSHI A., SALAH J.E., SAULT R.J., UDAYA SHANKAR N., SRIVANI K.S., STEVENS J., SUBRAHMANYAN R., TINGAY S.J., WATERSON M., WEBSTER R.L., WHITNEY A.R., WILLIAMS A., WILLIAMS C.L. and WYITHE J.S.B.

Abstract (from CDS):

We present a search for transient and variable radio sources at 154MHz with the Murchison Widefield Array 32-tile prototype. 51 images were obtained that cover a field of view of 1430 deg2 centred on Hydra A. The observations were obtained over three days in 2010 March and three days in 2011 April and May. The mean cadence of the observations was 26 min and there was additional temporal information on day and year time-scales. We explore the variability of a sample of 105 low-frequency radio sources within the field. Four bright (S > 6Jy) candidate variable radio sources were identified that displayed low levels of short time-scale variability (26 min). We conclude that this variability is likely caused by simplifications in the calibration strategy or ionospheric effects. On the time-scale of 1 yr we find two sources that show significant variability. We attribute this variability to either refractive scintillation or intrinsic variability. No radio transients were identified and we place an upper limit on the surface density of sources ρ < 7.5x10–5/deg2 with flux densities >5.5Jy, and characteristic time-scales of both 26 min and 1 yr.

Abstract Copyright: © 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2013)

Journal keyword(s): instrumentation: interferometers - techniques: image processing - catalogues - radio continuum: general

Nomenclature: Tables 3+5: [BMK2014] MWA JHHMM+DDMM N=6.

Simbad objects: 12

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Number of rows : 12
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 3C 196 Sy1 08 13 36.0561170112 +48 13 02.644966020   18.36 17.79     ~ 578 2
2 PKS 0834-19 rG 08 37 11.16132240 -19 51 56.7529560     19.6     ~ 59 1
3 PKS 0850-20 rG 08 53 00.2779 -20 47 26.652           ~ 32 1
4 1RXS J090129.1-255357 X 09 01 29.1 -25 53 57           ~ 1 0
5 PKS J0901-2555 SyG 09 01 47.2741003747 -25 55 16.067903655   18.5       ~ 71 1
6 LEDA 2801372 G 09 01 52.0 -25 53 33           ~ 3 0
7 MCG-02-24-007 LIN 09 18 05.66848602 -12 05 43.8060823   14.38 14.8     ~ 1077 1
8 PKS 0919-14 rG 09 22 12.8480752462 -14 28 48.974704364           ~ 16 1
9 1RXS J100511.0-214500 X 10 05 11.0 -21 45 00           ~ 1 0
10 NVSS J100511-214453 rG 10 05 11.464 -21 44 56.93           ~ 16 1
11 NAME Lockman Hole reg 10 45 00.0 +58 00 00           ~ 910 0
12 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0

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