J/MNRAS/425/1215 Multiwavelength survey of AGNs (Klesman+, 2012)
A multiwavelength survey of AGN in massive clusters:
AGN detection and cluster AGN fraction.
Klesman A.J., Sarajedini V.L.
<Mon. Not. R. Astron. Soc., 425, 1215-1238 (2012)>
=2012MNRAS.425.1215K 2012MNRAS.425.1215K
ADC_Keywords: Clusters, galaxy ; Active gal. nuclei ; X-ray sources ;
Infrared sources
Keywords: galaxies: active - galaxies: clusters: general - galaxies: evolution -
galaxies: statistics - infrared: galaxies - X-rays: galaxies: clusters
Abstract:
We aim to study the effect of environment on the presence and fuelling
of active galactic nuclei (AGNs) in massive galaxy clusters. We
explore the use of different AGN detection techniques with the goal of
selecting AGN across a broad range of luminosities, AGN/host galaxy
flux ratios and obscuration levels. From a sample of 12 galaxy
clusters at redshifts 0.5<z<0.9, we identify AGN candidates using
optical variability from multi-epoch Hubble Space Telescope imaging,
X-ray point sources in Chandra images and mid-infrared (IR) spectral
energy distribution power-law fits through the Spitzer Infrared Array
Camera channels. We find 178 optical variables, 74 X-ray point sources
and 64 IR power-law sources, resulting in an average of ∼25 AGN per
cluster.
Description:
All of the galaxy clusters used in this work are part of a sample
observed multiple times with the HST Advanced Camera for Surveys (ACS)
in a survey for supernovae in massive high-redshift clusters (HST
programmes GO 10493, cycle 14 and GO 10793, cycle 15, PI: Avishay
Gal-Yam). Our sample consists of 12 clusters with redshifts ranging
from 0.50 to 0.89. All have also been observed with the Chandra X-ray
observatory, and seven have been imaged in the mid-IR with the Spitzer
Infrared Array Camera (IRAC) instrument.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
clusters.dat 129 12 Cluster observations (table1), properties
(table2) and X-ray observations (table6)
table4.dat 59 103 Optical variables: two epochs
table5.dat 52 75 Optical variables: three epochs
table7.dat 86 74 X-ray point sources
table9.dat 98 64 IR power-law galaxies
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Byte-by-byte Description of file: clusters.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Name Cluster abbreviated name
11- 27 A17 --- Cluster Cluster name
29- 33 F5.3 --- z Redshift
35- 36 I2 h RAh Cluster right ascension (J2000)
38- 39 I2 min RAm Cluster right ascension (J2000)
41- 45 F5.2 s RAs Cluster right ascension (J2000)
47 A1 --- DE- Cluster declination sign (J2000)
48- 49 I2 deg DEd Cluster declination (J2000)
51- 52 I2 arcmin DEm Cluster declination (J2000)
54- 58 F5.2 arcsec DEs Cluster declination (J2000)
60 I1 --- Nep Number of ACS epochs
62 A1 --- Sp? [Y-] Observed by w/Spitzer?
64- 79 A16 --- SName Simbad name
81- 84 F4.1 10+37W LX ?=- X-ray luminosity (1044erg/s)
87- 90 F4.2 10+15Msun M200 Virial mass
91 A1 --- n_M200 [a] M200 derived from X-ray (1)
93- 96 F4.2 Mpc Rv Virial radius
98-101 F4.2 Mpc e_Rv ? rms uncertainty on Rv
103-106 I4 km/s sigma ?=- Velocity dispersion σ
108-123 A16 --- ObsX Obs Id of X-ray observations
124-129 F6.2 ks ExpX Exposure time for X-ray observation
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Note (1): a: M200 corresponds to MX,200 derived from X-ray gas as
measured by Barrett (2006, PhD thesis, Univ. Hawaii at Manoa)
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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- 6 A6 --- Group Group name
8- 16 A9 --- Name Cluster abbreviated name
18- 28 F11.7 deg RAdeg Variable right ascension (J2000)
30- 40 F11.7 deg DEdeg Variable declination (J2000)
42- 47 F6.3 mag mag1 Magnitude in epoch 1
49- 53 F5.3 mag dmag Magnitude difference, epoch 1 minus epoch 2
55- 59 F5.2 mag sig σσ* = where σ* is the
standard deviation of the Gaussian fits to
the reduced magnitude difference histograms
Δm/σ
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Name Cluster abbreviated name
11- 21 F11.7 deg RAdeg Variable right ascension (J2000)
23- 33 F11.7 deg DEdeg Variable declination (J2000)
35- 40 F6.3 mag Average magnitude from the three epochs
42- 46 F5.3 mag e_ Standard deviation on
48- 52 F5.2 mag sigma standard deviation of the Gaussian fits to
the magnitude difference histograms
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Byte-by-byte Description of file: table7.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Name Cluster abbreviated name
11- 21 F11.7 deg RAdeg Variable right ascension (J2000)
23- 33 F11.7 deg DEdeg Variable declination (J2000)
35- 39 F5.1 --- Signi Source significance
41- 44 F4.2 10-17W/m2 FF ?=- Full band (0.5-8keV) flux
46- 50 F5.3 10-17W/m2 FH ?=- Hard band (2-8keV) flux
52- 56 F5.3 10-17W/m2 FS ?=- Soft (0.5-2keV) band flux
58- 63 F6.2 10+35W LF ?=- Full band (0.5-8keV) luminosity
66- 71 F6.2 10+35W LH ?=- Hard band (2-8keV) luminosity
73- 78 F6.2 10+35W LS ?=- Soft band (0.5-2keV) luminosity
80- 86 F7.3 --- HR ?=- Hardness ratio, HR=(H-S)/(H+S)
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Byte-by-byte Description of file: table9.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Name Cluster abbreviated name
11- 21 F11.7 deg RAdeg Source right ascension (J2000)
23- 33 F11.7 deg DEdeg Source declination (J2000)
35- 41 F7.3 uJy IRAC1 Spitzer/IRAC 3.6um flux
43- 46 F4.2 uJy e_IRAC1 rms uncertainty on IRAC1
48- 54 F7.3 uJy IRAC2 Spitzer/IRAC 4.5um flux
56- 59 F4.2 uJy e_IRAC2 rms uncertainty on IRAC2
61- 67 F7.3 uJy IRAC3 Spitzer/IRAC 5.8um flux
69- 72 F4.2 uJy e_IRAC3 rms uncertainty on IRAC3
74- 80 F7.3 uJy IRAC4 Spitzer/IRAC 8.0um flux
82- 85 F4.2 uJy e_IRAC4 rms uncertainty on IRAC3
87- 92 F6.3 --- alpha Spectral index α
(f(ν)∝να)
94- 98 F5.3 --- e_alpha rms uncertainty on SpIndex
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 28-May-2013