J/MNRAS/325/1411 ATCA Intraday Variability Survey (Kedziora-Chudczer+, 2001)
The ATCA intraday variability survey of extragalactic radio sources.
Kedziora-Chudczer L.L., Jauncey D.L., Wieringa M.H., Tzioumis A.K.,
Reynolds J.E.
<Mon. Not. R. Astron. Soc. 325, 1411 (2001)>
=2001MNRAS.325.1411K 2001MNRAS.325.1411K
ADC_Keywords: Radio sources ; Polarization
Keywords: polarization - scattering - ISM: general - galaxies: active -
galaxies: nuclei - radio continuum: galaxies
Abstract:
We present the results of an Australia Telescope Compact Array (ATCA)
survey for intraday variability (IDV) of the total and polarized flux
densities of 118 compact, flat-spectrum, extragalactic radio sources
from the Parkes 2.7-GHz Survey. A total of 22 total flux density IDV
sources were discovered and 15 sources were found to show IDV of their
polarized flux density. We discuss the statistical properties of the
IDV sources, including the distribution of source modulation indices,
and the dependence of the variability amplitude on source spectral
index and on Galactic position. We suggest interstellar scintillation
(ISS) in the Galactic interstellar medium as the most likely mechanism
for IDV. Even so, the inferred high brightness temperatures cannot be
easily explained.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table3.dat 132 111 Averaged total flux densities and the modulation indices
for the sample of intraday variability sources.
table4.dat 162 74 Average polarized flux densities, modulation indices
of linear polarization and average position angle of
the polarized flux
--------------------------------------------------------------------------------
See also:
J/other/PASAu/10.310 : Parkes-Tidbinbilla radio sources (Duncan+ 1993)
Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 A8 --- Name Source name
10- 11 I2 --- N8.6GHz1 ? Number of data points included in average
at 8.6GHz on May 1994
13- 17 F5.2 Jy S8.6GHz1 ? Average total flux density at 8.6GHz on
May 1994
19- 23 F5.3 --- muS8.6GHz1 ? Modulation index on S8.6GHz1
25- 26 I2 --- N8.6GHz2 ? Number of data points included in average
at 8.6GHz on August 1994
28- 33 F6.3 Jy S8.6GHz2 ? Average total flux density at 8.6GHz on
August 1994
35- 39 F5.3 --- muS8.6GHz2 ? Modulation index on S8.6GHz2
41- 42 I2 --- N4.8GHz1 ? Number of data points included in average
at 4.8GHz on May 1994
44- 49 F6.3 Jy S4.8GHz1 ? Average total flux density at 4.8GHz on
May 1994
51- 55 F5.3 --- muS4.8GHz1 ? Modulation index on S4.8GHz1
57- 58 I2 --- N4.8GHz2 ? Number of data points included in average
at 4.8GHz on August 1994
60- 64 F5.2 Jy S4.8GHz2 ? Average total flux density at 4.8GHz on
August 1994
66- 70 F5.3 --- muS4.8GHz2 ? Modulation index on S4.8GHz2
72- 73 I2 --- N2.4GHz1 ? Number of data points included in average
at 2.4GHz on May 1994
75- 80 F6.3 Jy S2.4GHz1 ? Average total flux density at 2.4GHz on
May 1994
82- 86 F5.3 --- muS2.4GHz1 ? Modulation index on S2.4GHz1
88- 89 I2 --- N2.4GHz2 ? Number of data points included in average
at 2.4GHz on August 1994
91- 96 F6.3 Jy S2.4GHz2 ? Average total flux density at 2.4GHz on
August 1994
98-102 F5.3 --- muS2.4GHz2 ? Modulation index on S2.4GHz2
104-105 I2 --- N1.4GHz1 ? Number of data points included in average
at 1.4GHz on May 1994
107-111 F5.2 Jy S1.4GHz1 ? Average total flux density at 1.4GHz on
May 1994
113-117 F5.3 --- muS1.4GHz1 ? Modulation index on S1.4GHz1
119-120 I2 --- N1.4GHz2 ? Number of data points included in average
at 1.4GHz on August 1994
122-126 F5.2 Jy S1.4GHz2 ? Average total flux density at 1.4GHz
on August 1994
128-132 F5.3 --- muS1.4GHz2 ? Modulation index on S1.4GHz2
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 A8 --- Name Source name
10- 11 I2 --- N8.6GHz1 ? Number of data points included in average
at 8.6GHz on May 1994
13- 15 I3 mJy P8.6GHz1 ? Average polarized flux density at 8.6GHz on
May 1994
17- 21 F5.3 --- muP8.6GHz1 ? Modulation index on P8.6GHz1
23- 27 F5.1 deg PA8.6GHz1 [-90/90]? Average position angle of the
polarized flux at 8.6GHz on May 1994
29- 30 I2 --- N8.6GHz2 ? Number of data points included in average
at 8.6GHz on August 1994
32- 34 I3 mJy P8.6GHz2 ? Average polarized flux density at 8.6GHz on
August 1994
36- 41 F6.3 --- muP8.6GHz2 ? Modulation index on P8.6GHz2
43- 47 F5.1 deg PA8.6GHz2 [-90/90]? Average position angle of the
polarized flux at 8.6GHz on August 1994
49- 50 I2 --- N4.8GHz1 ? Number of data points included in average
at 4.8GHz on May 1994
52- 54 I3 mJy P4.8GHz1 ? Average polarized flux density at 4.8GHz on
May 1994
56- 60 F5.3 --- muP4.8GHz1 ? Modulation index on P4.8GHz1
62- 66 F5.1 deg PA4.8GHz1 [-90/90]? Average position angle of the
polarized flux at 4.8GHz on May 1994
68- 69 I2 --- N4.8GHz2 ? Number of data points included in average
at 4.8GHz on August 1994
71- 73 I3 mJy P4.8GHz2 ? Average polarized flux density at 4.8GHz on
August 1994
75- 79 F5.3 --- muP4.8GHz2 ? Modulation index on P4.8GHz2
81- 85 F5.1 deg PA4.8GHz2 [-90/90]? Average position angle of the
polarized flux at 4.8GHz on August 1994
87- 88 I2 --- N2.4GHz1 ? Number of data points included in average
at 2.4GHz on May 1994
90- 92 I3 mJy P2.4GHz1 ? Average polarized flux density at 2.4GHz on
May 1994
94- 98 F5.3 --- muP2.4GHz1 ? Modulation index on P2.4GHz1
100-104 F5.1 deg PA2.4GHz1 [-90/90]? Average position angle of the
polarized flux at 2.4GHz on May 1994
106-107 I2 --- N2.4GHz2 ? Number of data points included in average
at 2.4GHz on August 1994
109-111 I3 mJy P2.4GHz2 ? Average polarized flux density at 2.4GHz on
August 1994
113-117 F5.3 --- muP2.4GHz2 ? Modulation index on P2.4GHz2
119-123 F5.1 deg PA2.4GHz2 [-90/90]? Average position angle of the
polarized flux at 2.4GHz on August 1994
125-126 I2 --- N1.4GHz1 ? Number of data points included in average
at 1.4GHz on May 1994
128-130 I3 mJy P1.4GHz1 ? Average polarized flux density at 1.4GHz on
May 1994
132-136 F5.3 --- muP1.4GHz1 ? Modulation index on P1.4GHz1
138-142 F5.1 deg PA1.4GHz1 [-90/90]? Average position angle of the
polarized flux at 1.4GHz on May 1994
144-145 I2 --- N1.4GHz2 ? Number of data points included in average
at 1.4GHz on August 1994
147-149 I3 mJy P1.4GHz2 ? Average polarized flux density at 1.4GHz
on August 1994
151-156 F6.3 --- muP1.4GHz2 ? Modulation index on P1.4GHz2
158-162 F5.1 deg PA1.4GHz2 [-90/90]? Average position angle of the
polarized flux at 1.4GHz on August 1994
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) James Marcout, Patricia Bauer [CDS] 29-Jan-2002