2016MNRAS.458.1057O

Query : 2016MNRAS.458.1057O

2016MNRAS.458.1057O - Mon. Not. R. Astron. Soc., 458, 1057-1070 (2016/May-1)

Parametrizing Epoch of Reionization foregrounds: a deep survey of low-frequency point-source spectra with the Murchison Widefield Array.

OFFRINGA A.R., TROTT C.M., HURLEY-WALKER N., JOHNSTON-HOLLITT M., McKINLEY B., BARRY N., BEARDSLEY A.P., BOWMAN J.D., BRIGGS F., CARROLL P., DILLON J.S., EWALL-WICE A., FENG L., GAENSLER B.M., GREENHILL L.J., HAZELTON B.J., HEWITT J.N., JACOBS D.C., KIM H.-S., KITTIWISIT P., LENC E., LINE J., LOEB A., MITCHELL D.A., MORALES M.F., NEBEN A.R., PAUL S., PINDOR B., POBER J.C., PROCOPIO P., RIDING J., SETHI S.K., SHANKAR N.U., SUBRAHMANYAN R., SULLIVAN I.S., TEGMARK M., THYAGARAJAN N., TINGAY S.J., WAYTH R.B., WEBSTER R.L. and WYITHE J.S.B.

Abstract (from CDS):

Experiments that pursue detection of signals from the Epoch of Reionization (EoR) are relying on spectral smoothness of source spectra at low frequencies. This article empirically explores the effect of foreground spectra on EoR experiments by measuring high-resolution full-polarization spectra for the 586 brightest unresolved sources in one of the Murchison Widefield Array (MWA) EoR fields using 45 h of observation. A novel peeling scheme is used to subtract 2500 sources from the visibilities with ionospheric and beam corrections, resulting in the deepest, confusion-limited MWA image so far. The resulting spectra are found to be affected by instrumental effects, which limit the constraints that can be set on source-intrinsic spectral structure. The sensitivity and power-spectrum of the spectra are analysed, and it is found that the spectra of residuals are dominated by point spread function sidelobes from nearby undeconvolved sources. We release a catalogue describing the spectral parameters for each measured source.

Abstract Copyright: © 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): methods: observational - techniques: interferometric - dark ages, reionization, first stars - radio continuum: general - radio lines: galaxies

VizieR on-line data: <Available at CDS (J/MNRAS/458/1057): table4.dat>

Nomenclature: Table 4: MWAEOR JHHMMSS+DDMMSS N=586.

Simbad objects: 10

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Number of rows : 10
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 NGC 55 rG 00 14 53.602 -39 11 47.86 8.54 8.58 7.87 7.84   ~ 828 2
2 LEDA 2822170 Sy2 00 24 30.1497156456 -29 28 54.448830876     20.0     ~ 67 1
3 QSO B0023-263 BLL 00 25 49.15629900 -26 02 12.6141092   20.30 19.5 18.084   ~ 173 1
4 NGC 253 SyG 00 47 33.134 -25 17 19.68   8.03   6.94 8.1 ~ 3588 2
5 NAME Scl Group GrG 01 00 06 -33 44.2           ~ 526 0
6 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
7 MCG-06-01-008 QSO 23 57 00.7406438328 -34 45 32.994968292   13.89 13.26 12.19   ~ 131 2
8 NGC 7793 GiG 23 57 49.7540045856 -32 35 27.701550744 10.26 9.74 9.28 9.06 9.7 ~ 1188 2
9 [BL97] N7793-S26 SNR 23 58 00.27 -32 33 22.1           ~ 64 0
10 NAME Local Group GrG ~ ~           ~ 9325 0

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