J/MNRAS/376/1073 Sunyaev-Zel'dovich effect in galaxy clusters (Zemcov+, 2007)
A study of the Sunyaev-Zel'dovich increment using archival SCUBA data.
Zemcov M., Borys C., Halpern M., Mauskopf P., Scott D.
<Mon. Not. R. Astron. Soc., 376, 1073-1098 (2007)>
=2007MNRAS.376.1073Z 2007MNRAS.376.1073Z
ADC_Keywords: Clusters, galaxy ; Millimetric/submm sources
Keywords: galaxies: clusters: general - cosmic microwave background -
cosmology: observations - submillimetre
Abstract:
In a search for evidence of the short wavelength increment in the
Sunyaev-Zel'dovich (SZ) effect, we have analysed archival galaxy
cluster data from the Submillimetre Common User Bolometer Array
(SCUBA) on the James Clerk Maxwell Telescope, resulting in the most
complete pointed survey of clusters at 850µm to date. SCUBA's
850µm passband overlaps the peak of the SZ increment. The sample
consists of 44 galaxy clusters in the range 0<z<1.3. Maps of each of
the clusters have been made and sources have been extracted; as an
ancillary product, we generate the most thorough galaxy cluster point
source list yet from SCUBA. 17 of these clusters are free of obvious
active galactic nuclei (AGN) and have data deep enough to provide
interesting measurements of the expected SZ signal.
Description:
This work has made use of both JCMT archival data and new JCMT
observations. For Cl 0152.7-1357, new JCMT data were obtained on 2003
Sept. 28, 29 and 2003 Oct. 17.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
cluster.dat 48 44 Cluster positions (from Simbad)
tablea1.dat 119 130 Archival cluster data sets
tableb1.dat 71 83 Positions, fluxes at 850 and 450um, errors and
chi2 statistics for the candidate sources
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See also:
J/A+A/417/827 : Relativistic corr. to Sunyaev-Zeldovich effect (Itoh+, 2004)
Byte-by-byte Description of file: cluster.dat
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Bytes Format Units Label Explanations
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1- 13 A13 --- Cluster Cluster name
17- 18 I2 h RAh Simbad Right ascension (J2000)
20- 21 I2 min RAm Simbad Right ascension (J2000)
23- 24 I2 s RAs Simbad Right ascension (J2000)
26 A1 --- DE- Simbad Declination sign (J2000)
27- 28 I2 deg DEd Simbad Declination sign (J2000)
30- 33 F4.1 arcmin DEm Simbad Declination sign (J2000)
35- 48 A14 --- SName Simbad name
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Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 13 A13 --- Cluster Cluster
15- 24 A10 --- Project JCMT project IDs
26-101 A76 --- ObsDates Observation dates
104-108 F5.1 ks Time Integration time
110-114 F5.3 --- tau850 Mean scatter of the optical depth at 850um for
the uncorrupted parts of the data sets
116-119 F4.2 --- e_tau850 ? Scatter of the optical depth for the
uncorrupted parts of the data sets
blank for sets with insufficient tau850
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Byte-by-byte Description of file: tableb1.dat
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Bytes Format Units Label Explanations
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1- 13 A13 --- Cluster Cluster
14 A1 --- --- [-]
15 I1 --- Galaxy Galaxy number within the Cluster
16 A1 --- n_Galaxy [a] Note (1)
18- 19 I2 h RAh Right ascension (J2000)
21- 22 I2 min RAm Right ascension (J2000)
24- 27 F4.1 s RAs Right ascension (J2000)
29 A1 --- DE- Declination sign (J2000)
30- 31 I2 deg DEd Declination sign (J2000)
33- 34 I2 arcmin DEm Declination sign (J2000)
36- 37 I2 arcsec DEs Declination sign (J2000)
39- 42 F4.1 mJy F850um Flux at 850um
44- 47 F4.1 mJy S/N850um Signal-to-noise ratio at 850um
49- 51 I3 --- chi2 chi2 statistic (2)
52 A1 --- --- (/)
53- 55 I3 --- DOF Degrees of freedom
57- 59 I3 mJy F450um ? Flux at 450um
61- 63 I3 mJy e_F450um ? rms uncertainty on F450um
64- 71 A8 --- n_F450um "Off Edge" for sources that not appear in the
450um maps
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Note (1): The sources flagged with 'a' are possibly images of the SZ effect
and we do not subtract them before doing the SZ effect fit. Because in
a number of cases the apparent source is resolved, the chi2 in some
of these sources is poor.
Note (2): The chi2 values are determined by subtracting the fiducial JCMT
PSF from the map centred on the nominal point source's position and
then summing the squared residuals for the entire image.
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 28-Sep-2007