J/ApJ/734/L34 145MHz source measurements by PAPER (Jacobs+, 2011)
New 145 MHz source measurements by PAPER in the southern sky.
Jacobs D.C., Aguirre J.E., Parsons A.R., Pober J.C., Bradley R.F.,
Carilli C.L., Gugliucci N.E., Manley J.R., van der Merwe C., Moore D.F.,
Parashare C.R.
<Astrophys. J., 734, L34 (2011)>
=2011ApJ...734L..34J 2011ApJ...734L..34J
ADC_Keywords: Radio sources ; Interferometry ; Cross identifications
Keywords: catalogs - dark ages, reionization, first stars -
instrumentation: interferometers
Abstract:
We present observations from the Precision Array for Probing the Epoch
of Reionization (PAPER) in South Africa, observed in 2010 May and
September. Using two nights of drift scanning with PAPER's 60°
FWHM beam we have made a map covering the entire sky below +10°
declination with an effective center frequency of 145MHz, a 70MHz
bandwidth, and a resolution of 26'. A 4800deg2 region of this large
map with the lowest Galactic emission reaches an rms of 0.7Jy. We
establish an absolute flux scale using sources from the 160MHz
Culgoora catalog (Cat. VIII/35). Using the 408MHz Molonglo Reference
Catalog (MRC, Cat. VIII/16) as a finding survey, we identify
counterparts to 480 sources in our maps and compare our fluxes to the
MRC and to 332 sources in the Culgoora catalog. For both catalogs, the
ratio of PAPER to catalog flux averages to 1, with a standard
deviation of 50%. This measured variation is consistent with
comparisons between independent catalogs observed at different bands.
The PAPER data represent new 145MHz flux measurements for a large
number of sources in the band expected to encompass cosmic
reionization and represents a significant step toward establishing a
model for removing foregrounds to the reionization signal.
Description:
In this Letter, we present new flux measurements of 480 sources at
145MHz using PAPER (Precision Array for Probing the Epoch of
Reionization). During 2010 May and September, we recorded
commissioning data with PSA32 antennas in two separate campaigns. The
data presented here are from UT 2010 May 19 13:11-2010 May 20 04:50
(15hr) and UT 2010 September 15 16:48-2010 September 16 04:04 (12hr).
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table2.dat 65 480 PAPER (Precision Array for Probing the Epoch of
Reionization) fluxes for 480 MRC sources and
matching Culgoora fluxes
--------------------------------------------------------------------------------
See also:
VIII/35 : Radio Sources observed with Culgoora Circular Array (Slee 1995)
VIII/16 : Molonglo Reference Catalogue of Radio Sources (Large+ 1991)
VIII/85 : SPECFIND V2.0 Catalog of radio continuum spectra (Vollmer+ 2009)
VIII/79 : The VLA Low-frequency Sky Survey at 74MHz (Cohen+ 2007)
VIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998)
VIII/18 : 6C Survey of radio sources I. (Baldwin+ 1985)
J/ApJS/174/313 : Spectra of 388 bright 74MHz sources (Helmboldt+, 2008)
J/AJ/131/100 : The Molonglo Southern 4Jy sample. I (Burgess+, 2006)
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 F6.2 deg RAdeg PAPER Right Ascension in decimal degrees (J2000)
8- 13 F6.2 deg DEdeg PAPER Declination in decimal degrees (J2000)
15- 23 A9 --- MRC MRC name (HHMM+DDdA) (1)
24 A1 --- n_MRC [eyf] Key to alternative source name (2)
26- 30 F5.1 Jy S145 Integrated 110-180MHz PAPER flux density
32- 35 F4.1 Jy RMS RMS in 1-3 deg annulus around source
37- 40 F4.2 deg Sep Distance between MRC and PAPER positions
42- 49 A8 --- Cul Culgoora name (HHMM+DDdA) (3)
51- 55 F5.1 Jy S160 ? Culgoora 160MHz flux density
57- 59 I3 Jy S80 ? Culgoora 80MHz flux density
61- 65 F5.2 --- SpI ? Culgoora spectral index between 80-160MHz
--------------------------------------------------------------------------------
Note (1): PAPER Southern Sky catalog generated by searching for sources
in the Molonglo Reference Catalog (Cat. VIII/16) above 4Jy and below
+10° Declination. Images have been flux scaled to Culgoora using:
1422-297 and 0521-365. CenA, FornaxA, and PictorA having been peeled
and are excluded here.
Note (2): Flag as follows:
e = source "Her A"
y = source "Hyd A"
f = source "For A"(sw)
Note (3): Sources with a matching Culgoora source are listed here.
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 28-Nov-2012