J/ApJ/729/22 SEDs of galaxy cluster members (Atlee+, 2011)
A multi-wavelength study of low-redshift clusters of galaxies.
I. Comparison of X-ray and mid-infrared selected active galactic nuclei.
Atlee D.W., Martini P., Assef R.J., Kelson D.D., Mulchaey J.S.
<Astrophys. J., 729, 22 (2011)>
=2011ApJ...729...22A 2011ApJ...729...22A
ADC_Keywords: Clusters, galaxy ; Galaxies, IR ; Photometry, infrared ;
Photometry, UBVRI ; X-ray sources
Keywords: galaxies: active - galaxies: clusters: general - infrared: galaxies -
X-rays: galaxies
Abstract:
We present results from a study of AGNs and their host galaxies found
in low-redshift galaxy clusters. We fit model spectral energy
distributions (SEDs) to the combined visible and mid-infrared (MIR)
photometry of cluster members and use these model SEDs to determine
stellar masses and star formation rates (SFRs). We identify two
populations of AGNs, the first based on their X-ray luminosities
(X-ray AGNs) and the second based on the presence of a significant AGN
component in their model SEDs (IR AGNs). We find that the two AGN
populations are nearly disjoint; only 8 out of 44 AGNs are identified
with both techniques.
Description:
We obtained MIR observations with the Spitzer Space Telescope of the
X-ray sources identified as members of eight low-redshift galaxy
clusters by Martini et al., 2006ApJ...644..116M 2006ApJ...644..116M. Visible wavelength
photometry of these clusters were obtained at the 2.5m du Pont
telescope at Las Campanas by Martini et al. 2006ApJ...644..116M 2006ApJ...644..116M.
MIR observations from the Spitzer Space Telescope were obtained using
the IRAC (3.6, 4.5, 5.8, and 8.0um) and MIPS (24um) instruments from
Spitzer program 50096 (PI: Martini). Observations were carried out
between 2008 November 1 and 2009 April 22. We supplemented these
observations with data from the Spitzer archive for Abell 1689 and AC 114.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 112 8 Cluster sample
table2.dat 144 579 Cluster member photometry
table3.dat 90 43 Identified active galactic nuclei
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See also:
VII/165 : Measured Redshifts of Abell Clusters of Galaxies (Andernach 1991)
VII/110 : Rich Clusters of Galaxies (Abell+ 1989)
J/ApJS/199/34 : Clusters of galaxies in SDSS-III (Wen+, 2012)
J/ApJS/199/23 : IR and UV star formation in ACCEPT BCGs (Hoffer+, 2012)
J/ApJS/195/15 : Luminosity profiles of BCGs (Donzelli+, 2011)
J/MNRAS/392/1509 : Distribution of AGNs in galaxy clusters (Gilmour+, 2009)
J/ApJ/704/1586 : BCGs with radio AGN (Sun, 2009)
J/MNRAS/384/1502 : NIR photometry of X-ray luminous BCGs (Stott+, 2008)
J/ApJ/682/821 : Spectral fits of galaxy clusters in X-ray (Cavagnolo+, 2008)
J/ApJ/664/761 : BVRI photometry of AGNs in clusters (Martini+, 2007)
J/ApJ/665/921 : Redshift survey in the field of A1689 (Frye+, 2007)
J/MNRAS/366/645 : LARCS. 11 X-ray luminous clusters (Pimbblet+, 2006)
J/A+AS/119/391 : Photometry of seven clusters of galaxies (Molinari+ 1996)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 14 A14 --- Cluster Cluster name
16- 21 F6.4 --- z Redshift (1)
23- 26 I4 km/s Sig Velocity dispersion of cluster members (2)
28- 30 I3 --- N Number of members (3)
32- 58 A27 --- AORirac Spitzer/IRAC AOR number(s) used to contruct
IRAC mosaics
59 A1 --- f_AORirac [a] Flag for Abell 1689 (4)
61- 64 F4.2 10+35W L8um Observed 8um luminosity in 10+42erg/s (5)
66-101 A36 --- AORmips Spitzer/MIPS AOR number(s) used to construct
the 24um mosaics
103-105 F3.1 10+34W L24um ? 3σ lower limits on detectable 24um
luminosities (6)
107-112 A6 --- Cl Cluster shorthand as in other tables
(added by CDS)
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Note (1): Redshifts from Martini et al. (2007, Cat. J/ApJ/664/761) determined
using the bi-weight estimator of Beers et al. (1990AJ....100...32B 1990AJ....100...32B).
Note (2): Velocity dispersions of cluster members estimated by Martini et al.
(2009ApJ...701...66M 2009ApJ...701...66M) using the bi-weight measure of Beers et al.
(1990AJ....100...32B 1990AJ....100...32B).
Note (3): Total number of galaxies with both MIR and R-band coverage identified
as cluster members by Martini et al. (2007, Cat. J/ApJ/664/761) or
extracted from the literature using their redshift limits.
Note (4): Abell 1689 other IRAC AORs are : 14696192, 14696448, 14696704,
14696960, 14697216, 14697472, 25411840.
Note (5): The minimum detectable observer-frame 8um luminosity νL_ν(8um)
in each cluster, derived from the 3σ lower limit on measurable
flux in a "typical" part of the 8um mosaic image. Due to the variable
coverage across the cluster, lower luminosities are detectable in
some cluster members than in others.
Note (6): Observer-frame 24um luminosity νL_ν(24um), derived in a similar
manner to the IRAC limits in Column L8um, and have the same caveats.
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Name Member name ({Cl}-NNN) (1)
12- 13 I2 h RAh Hour of Right Ascension (J2000) (2)
15- 16 I2 min RAm Minute of Right Ascension (J2000) (2)
18- 21 F4.1 s RAs Second of Right Ascension (J2000) (2)
23 A1 --- DE- Sign of the Declination (J2000) (2)
24- 25 I2 deg DEd Degree of Declination (J2000) (2)
27- 28 I2 arcmin DEm Arcminute of Declination (J2000) (2)
30- 31 I2 arcsec DEs Arcsecond of Declination (J2000) (2)
33- 37 F5.2 mag Bmag ? B band Vega magnitude (3)
39- 42 F4.2 mag e_Bmag ? Uncertainty in Bmag (3)
44- 48 F5.2 mag Vmag ? V band Vega magnitude (3)
50- 53 F4.2 mag e_Vmag ? Uncertainty in Vmag (3)
55- 59 F5.2 mag Rmag R band Vega magnitude (3)
61- 64 F4.2 mag e_Rmag Uncertainty in Rmag (3)
66- 70 F5.2 mag Imag ? I band Vega magnitude (3)
72- 75 F4.2 mag e_Imag ? Uncertainty in Imag (3)
77 A1 --- l_F3.6 The 3σ upper limit flag on F3
78- 87 F10.2 mJy F3.6 ? Spitzer/IRAC 3.6 micron band flux density (4)
89- 92 F4.2 mJy e_F3.6 ? Uncertainty in F3.6
94 A1 --- l_F4.5 The 3σ upper limit flag on F4.5
95-100 F6.2 mJy F4.5 ? Spitzer/IRAC 4.5 micron band flux density (4)
102-105 F4.2 mJy e_F4.5 ? Uncertainty in F4.5
107 A1 --- l_F5.8 The 3σ upper limit flag on F5.8
108-113 F6.2 mJy F5.8 ? Spitzer/IRAC 5.8 micron band flux density (4)
115-118 F4.2 mJy e_F5.8 ? Uncertainty in F5.8
120 A1 --- l_F8.0 The 3σ upper limit flag on F8.0
121-126 F6.2 mJy F8.0 ? Spitzer/IRAC 8.0 micron band flux density (4)
128-131 F4.2 mJy e_F8.0 ? Uncertainty in F8.0
133 A1 --- l_F24 The 3σ upper limit flag on F8.0
134-139 F6.2 mJy F24 ? Spitzer/MIPS 24 micron band flux density (4)
141-144 F4.2 mJy e_F24 ? Uncertainty in F24
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Note (1): Constructed from a shorthand of its parent cluster and the order in
which each object appears in the list of cluster members extracted
from NED. <[AMA2011] {Cl} NNN> in Simbad.
Note (2): As derived from the R-band images.
Note (3): Fluxes are measured in the R-band Kron-like aperture. Objects with
no quoted magnitudes in a given band have either no coverage or no
detection in that band. No upper limits are quoted.
Note (4): Measured in R-band Kron-like aperture. Upper limits are derived
from the appropriate uncertainty mosaic. Galaxies with no quoted
upper limit for a given band have no coverage in the corresponding
image.
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Name Member name as in Table 2 ({Cl}-NNN)
12- 19 A8 --- MName Martini et al. 2006ApJ...644..116M 2006ApJ...644..116M name
(<[MKK2006] {Cl}-NNN> in Simbad)
21- 22 I2 h RAh Hour of Right Ascension (J2000) (1)
24- 25 I2 min RAm Minute of Right Ascension (J2000) (1)
27- 30 F4.1 s RAs Second of Right Ascension (J2000) (1)
32 A1 --- DE- Sign of the Declination (J2000) (1)
33- 34 I2 deg DEd Degree of Declination (J2000) (1)
36- 37 I2 arcmin DEm Arcminute of Declination (J2000) (1)
39- 40 I2 arcsec DEs Arcsecond of Declination (J2000) (1)
42- 46 F5.1 10+36W Lbol ? Bolometric luminosity; 1043erg/s (2)
48- 51 F4.1 10+36W e_Lbol ? Uncertainty in Lbol
53- 57 F5.1 10+34W LX ? X-ray luminosity; 1041erg/s (3)
59 A1 --- l_M* The 3σ upper limit flag on M*
60- 65 F6.1 10+10Msun M* Stellar mass (4)
67- 69 F3.1 10+10Msun stM* ? Statistical uncertainty in M* (5)
71- 73 F3.1 10+10Msun syM* ? Systemic uncertainty in M* (5)
75 A1 --- l_SFR The 3σ upper limit flag on SFR
76- 86 F11.2 Msun/yr SFR Star formation rate (6)
88- 90 F3.1 Msun/yr e_SFR ? Uncertainty in SFR
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Note (1): As derived from the R-band images.
Note (2): Derived by integrating the direct component of the AGN contribution
to the model SED. These luminosities are quoted only for IR AGNs.
Note (3): Rest-frame X-ray luminosities in the 0.3-8keV band from Table 4
of Martini et al. (2006ApJ...644..116M 2006ApJ...644..116M). X-ray luminosities are given
only for X-ray AGNs.
Note (4): Derived using the M/L coefficients appropriate for a solar
metallicity galaxy with a scaled Salpeter IMF and applying the
Bruzual & Charlot population synthesis model (Bell and de Jong
2001ApJ...550..212B 2001ApJ...550..212B, Table 4).
Note (5): Systematic errors are derived by applying the M/L coefficients
appropriate for a Salpeter IMF and the Pegase population synthesis
model. Upper limits are given at 3σ of the statistical error
only.
Note (6): Derived either from the 8 micron luminosity, the 24 micron luminosity
or by taking the geometric mean of the two, depending on the
measurements available. Uncertainties include only statistical
errors, and upper limits are quoted at 3σ in the more
sensitive of the 8 micron and 24 micron bands.
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History:
From electronic version of the journal
References:
Atlee & Martini Paper II. 2012ApJ...761..114A 2012ApJ...761..114A Cat. J/ApJ/761/114
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 07-Sep-2012