J/ApJ/591/640 XMM-LSS low-frequency radio counterparts (Cohen+, 2003)
The low-frequency radio counterpart of the XMM Large-Scale Structure Survey.
Cohen A.S., Rottgering H.J.A., Kassim N.E., Cotton W.D., Perley R.A.,
Wilman R., Best P., Pierre M., Birkinshaw M., Bremer M., Zanichelli A.
<Astrophys. J. 591, 640 (2003)>
=2003ApJ...591..640C 2003ApJ...591..640C
ADC_Keywords: Clusters, galaxy ; Radio sources ; Morphology
Keywords: cosmology: observations - galaxies: clusters: general -
radio continuum: general
Abstract:
The XMM Large-Scale Structure Survey (XMM-LSS) is a major project to
map the large-scale structure of the universe out to cosmological
distances. An 8x8 region will be surveyed by XMM with planned optical
follow-up to produce a three-dimensional map of many hundreds of
clusters out to a redshift of z=1. To explore the relation of the
large-scale structure to the location and properties of extragalactic
radio sources, the XMM-LSS project also includes a low-frequency radio
survey of this region. This combination will provide unprecedented
insight into how the radio source formation and evolution are affected
by the local environment. Here we present preliminary results from our
325 and 74MHz surveys in this region. At 325MHz, we have a flux limit
of 4mJy/beam, a resolution of 6.3", and a total of 256 source
detections over 5.6deg2. At 74MHz, we have a flux limit of
275mJy/beam, a resolution of 30", and a total of 211 source detections
over 110deg2. We describe these results and explore what they tell
us about the population of extragalactic low-frequency radio sources.
The 74MHz survey represents the first presentation of a deep,
subarcminute resolution survey at such a low frequency. This was made
possible by recent advances in both hardware and data reduction
algorithms, which we describe in detail.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 107 334 325MHz source list
table3.dat 107 241 74MHz source list
table4.dat 63 22 Objects with known redshifts
refs.dat 123 12 References
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See also:
B/xmm : XMM-Newton Observation Log (XMM-Newton Science Operation Center, 2002)
IX/37 : XMM-Newton Serendipitous Source Catalogue (1XMM) (XMM-SSC, 2003)
Byte-by-byte Description of file: table2.dat table3.dat
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Bytes Format Units Label Explanations
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1- 12 A12 --- XMM-LSS Source name (JHHMM.m+DDMM)
13 A1 --- n_XMM-LSS [*] Indicates source detected
at 74 and 325MHz
15- 16 I2 h RAh Hour of Right Ascension (J2000)
18- 19 I2 min RAm Minute of Right Ascension (J2000)
21- 25 F5.2 s RAs Second of Right Ascension (J2000)
27- 29 F3.1 arcsec e_RAs Error in Right Ascension
31 A1 --- DE- Sign of the Declination (J2000)
32- 33 I2 deg DEd Degree of Declination (J2000)
35- 36 I2 arcmin DEm Arcminute of Declination (J2000)
38- 41 F4.1 arcsec DEs Arcsecond of Declination (J2000)
43- 45 F3.1 arcsec e_DEs Error in Declination
47- 50 F4.2 deg Dist Distance from pointing center
52 A1 --- Type Source type (1)
54- 60 F7.2 mJy Flux Integrated flux
(at 325MHz for table2, 74MHz for table3)
62- 66 F5.2 mJy e_Flux Uncertainty in Flux
68- 69 A2 --- l_MajAxis [≤ ] Indicates a 2σ upper limit for
unresolved source on MajAxis
70- 74 F5.1 arcsec MajAxis ? Size of Major Axis (2)
76- 79 F4.1 arcsec e_MajAxis ? Error in MajAxis
81- 82 A2 --- l_MinAxis [≤ ] Indicates a 2σ upper limit for
unresolved source on MinAxis
83- 86 F4.1 arcsec MinAxis ? Size of Minor Axis
88- 90 F3.1 arcsec e_MinAxis ? Error in MinAxis
92- 94 I3 deg PA ? Position Angle
96- 97 I2 deg e_PA ? Error in PA
99 A1 --- f_PA [N] Indicates not applicable
101 A1 --- l_alpha Limit flag on alpha
102-106 F5.2 --- alpha Spectral index with respect to NVSS 1.4GHz
flux (3)
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Note (1): Source type:
S = Single source;
M = Multiple source;
C = Component of multiple source.
Note (2): MaxAxis is the maximum separation between source components for
multiple sources (Type = M).
Note (3): alpha = α1400325 in table2, α140074 in table3.
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 12 A12 --- XMM-LSS Source name (JHHMM.m+DDMM)
14- 15 I2 h RAh Right ascension (J2000.0)
17- 18 I2 min RAm Right ascension (J2000.0)
20- 24 F5.2 s RAs Right ascension (J2000.0)
26 A1 --- DE- Declination sign (J2000.0)
27- 28 I2 deg DEd Declination (J2000.0)
30- 31 I2 arcmin DEm Declination (J2000.0)
33- 36 F4.1 arcsec DEs Declination (J2000.0)
38- 43 A6 --- Type Type (Galaxy or QSO)
46- 52 F7.5 --- z Redshift
54- 60 F7.5 -- e_z ? rms uncertainty on z
62- 63 I2 --- r_z Reference for redshift, in refs.dat file
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Ref Reference number
4- 22 A19 --- BibCode Bibcode
24- 44 A21 --- Aut Authotr's name
46-122 A77 --- Com Comments
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Bauer [CDS] 22-Sep-2003