2016A&A...587A..85R


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.17CEST11:13:15

2016A&A...587A..85R - Astronomy and Astrophysics, volume 587A, 85-85 (2016/3-1)

Multi-source self-calibration: Unveiling the microJy population of compact radio sources.

RADCLIFFE J.F., GARRETT M.A., BESWICK R.J., MUXLOW T.W.B., BARTHEL P.D., DELLER A.T. and MIDDELBERG E.

Abstract (from CDS):

Very long baseline interferometry (VLBI) data are extremely sensitive to the phase stability of the VLBI array. This is especially important when we reach µJy rms sensitivities. Calibration using standard phase-referencing techniques is often used to improve the phase stability of VLBI data, but the results are often not optimal. This is evident in blank fields that do not have in-beam calibrators. We present a calibration algorithm termed multi-source self-calibration (MSSC) which can be used after standard phase referencing on wide-field VLBI observations. This is tested on a 1.6GHz wide-field VLBI data set of the Hubble Deep Field North and the Hubble Flanking Fields.MSSC uses multiple target sources that are detected in the field via standard phase referencing techniques and modifies the visibilities so that each data set approximates to a point source. These are combined to increase the signal to noise and permit self-calibration. In principle, this should allow residual phase changes caused by the troposphere and ionosphere to be corrected. By means of faceting, the technique can also be used for direction-dependent calibration.Phase corrections, derived using MSSC, were applied to a wide-field VLBI data set of the HDF-N, which comprises of 699 phase centres. MSSC was found to perform considerably better than standard phase referencing and single source self-calibration. All detected sources exhibited dramatic improvements in dynamic range. Using MSSC, one source reached the detection threshold, taking the total detected sources to twenty. This means 60% of these sources can now be imaged with uniform weighting, compared to just 45% with standard phase referencing. In principle, this technique can be applied to any future VLBI observations.

Abstract Copyright:

Journal keyword(s): techniques: interferometric - radio continuum: galaxies - instrumentation: interferometers

CDS comments: Calibrators J1234+619 and J1241+602 not identified.

Simbad objects: 22

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Number of rows : 22

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 NAME Lockman Hole reg 10 45 00.0 +58 00 00           ~ 732 0
2 [TEL2005] 1346 Sy2 12 36 08.130 +62 10 35.89 24.69 23.79 22.867 21.8 20.986 ~ 33 0
3 [BCW2008] 189.073135+62.26129 rG 12 36 17.54 +62 15 40.7 23.80 25.336 25.215 24.7 23.9 ~ 23 0
4 SHARDS J123620.29+620844.3 AGN 12 36 20.303 +62 08 44.44 25.88 24.286 24.56 23.2 21.88 ~ 22 0
5 [R2000] J123622.516+620653.85 Rad 12 36 22.49 +62 06 53.8           ~ 3 0
6 [R2000] VLA J123623+621642 AGN 12 36 23.53 +62 16 42.6     24.59   23.9 ~ 16 0
7 TKRS 1610 AGN 12 36 40.5339 +62 18 33.378 25.65 25.1   23.55 22.55 ~ 17 0
8 [RMB2007] J123642+621331 EmG 12 36 42.08 +62 13 31.4 26.8 27.5 26.2 25.8 24.9 ~ 57 0
9 SHARDS J123644.39+621133.2 AGN 12 36 44.396 +62 11 33.17 26.48 25.0 24.15 21.96 21.60 ~ 79 0
10 2XMM J123646.2+621405 Sy1 12 36 46.362 +62 14 04.45 24.58 23.87 23.174 21.69 21.571 ~ 98 0
11 NAME Hubble Deep Field reg 12 36 49.5 +62 12 58           ~ 1801 1
12 TKRS 5913 ALS 12 36 52.884 +62 14 43.95 24.30 21.900 20.016 18.93 19.189 ~ 47 0
13 [R2000] J123659.151+621832.81 AGN 12 36 59.151 +62 18 32.81           ~ 4 0
14 NAME SMM J123700+620912 AGN 12 37 00.23 +62 09 09.7     26.4   25.0 ~ 26 0
15 TKRS 1382 AGN 12 37 01.106 +62 21 09.17 25.65 24.52   21.76 20.819 ~ 21 0
16 [R2000] J123709.453+620837.67 G 12 37 09.40 +62 08 37.5 24.7 24.33 23.3 21.86 20.4 ~ 19 0
17 NAME SMM J123713.9+621827 AGN 12 37 13.86 +62 18 26.2     27.4 27.3 26.5 ~ 25 1
18 [R2000] J123714.964+620823.45 AGN 12 37 14.92 +62 08 23.1         22.0 ~ 11 0
19 TKRS 7954 G 12 37 16.3735 +62 15 12.614 23.47 24.58 22.698 20.27 20.289 ~ 34 0
20 2XMM J123716.7+621733 Sy2 12 37 16.6752 +62 17 33.624 24.78 24.79 24.18 23.4 22.69 ~ 36 0
21 [RMB2007] J123721+621129 G 12 37 21.24 +62 11 29.9 24.8 24.3 24.3 23.8 25.0 ~ 23 0
22 [R2000] J123725.726+621128.50 AGN 12 37 25.726 +62 11 28.50     26.40     ~ 7 0

    Equat.    Gal    SGal    Ecl

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2019.10.17-11:13:15

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