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J/ApJS/176/39     IR survey of brightest cluster galaxies I.    (Quillen+, 2008)

An infrared survey of brightest cluster galaxies. I. Quillen A.C., Zufelt N., Park J., O'Dea C.P., Baum S.A., Privon G., Noel-Storr J., Edge A., Russell H., Fabian A., Donahue M., Bregman J.N., McNamara B.R., Sarazin C.L. <Astrophys. J. Suppl. Ser., 176, 39-58 (2008)> =2008ApJS..176...39Q
ADC_Keywords: Galaxies, IR ; Clusters, galaxy ; Photometry, infrared ; Surveys Keywords: cooling flows - galaxies: active - galaxies: clusters: general galaxies: elliptical and lenticular, cD - infrared: galaxies stars: formation Abstract: We report on an imaging survey with the Spitzer Space Telescope of 62 brightest cluster galaxies (BCGs) with optical line emission. These galaxies are located in the cores of X-ray luminous clusters selected from the ROSAT All-Sky Survey. We find that about half of these sources have a sign of excess infrared emission; 22 objects out of 62 are detected at 70um, 18 have 8/5.8um flux ratios above 1.0 and 28 have 24/8um flux ratios above 1.0. Altogether 35 of 62 objects in our survey exhibit at least one of these signs of infrared excess. Four galaxies with infrared excesses have a 4.5/3.6um flux ratio indicating the presence of hot dust, and/or an unresolved nucleus at 8um. Three of these have high measured [OIII](5007Å)/Hβ flux ratios suggesting that these four, Abell 1068, Abell 2146, Zwicky 2089, and R0821+07, host dusty active galactic nuclei (AGNs). Nine objects (including the four hosting dusty AGNs) have infrared luminosities greater than 1011L and so can be classified as luminous infrared galaxies (LIRGs). Excluding the four systems hosting dusty AGNs, the excess mid-infrared emission in the remaining brightest cluster galaxies is likely related to star formation. Description: The 3.6, 4.5, 5.8, and 8.0um broadband images were obtained during cycle 3 (2007-2008) using the Infrared Array Camera (IRAC; Fazio et al., 2004ApJS..154...10F) onboard Spitzer. The 24.4 and 70um images were obtained using the Multiple Imaging Photometer for Spitzer (MIPS; Rieke et al., 2004ApJS..154...25R). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 86 63 The brightest cluster galaxy sample and comparison luminosities table2.dat 53 63 Infrared photometry table3.dat 25 63 Estimated infrared luminosities of BCGs
See also: J/A+AS/109/147 : ROSAT AGN content (Brinkmann+, 1995) J/MNRAS/301/881 : The ROSAT brightest cluster sample - I. (Ebeling+, 1998) J/MNRAS/306/857 : ROSAT Brightest Cluster Sample. III. (Crawford+, 1999) J/ApJ/519/533 : ROSAT observations of ACO clusters (David+, 1999) J/MNRAS/318/333 : Extended ROSAT Bright Cluster Sample (Ebeling+ 2000) J/A+A/425/367 : REFLEX Galaxy Cluster Survey catalogue (Boehringer+, 2004) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 16 A16 --- Name Cluster name 17- 19 A3 --- n_Name [a-g, ] Notes on cluster (G1) 21- 22 I2 h RAh BCG Hour of right ascension (J2000) (2) 24- 25 I2 min RAm BCG Minute of right ascension (J2000) (2) 27- 31 F5.2 s RAs BCG Second of right ascension (J2000) (2) 33 A1 --- DE- BCG Declination sign (J2000) (2) 34- 35 I2 deg DEd BCG Degree of declination (J2000) (2) 37- 38 I2 arcmin DEm BCG Arcminute of declination (J2000) (2) 40- 43 F4.1 arcsec DEs BCG Arcsecond of declination (J2000) (2) 45- 50 F6.4 --- z Redshift 52- 56 F5.2 10+37W LX X-ray luminosity based on 0.1-2.4keV ROSAT fluxes (in 1044erg/s) (3) 57 A1 --- f_LX [a] X-ray contamination (4) 59 I1 --- r_LX Luminosity measurement reference (5) 61- 66 F6.2 10+33W LHa ?=- Hα luminosity (in 1040erg/s) 68- 70 F3.1 --- O3/Hb ?=- [OIII](5007)/Hβ flux ratio 72- 73 I2 --- r_O3/Hb ? Optical line flux and ratio measurement reference (5) 75 A1 --- l_L1.4GHz Limit flag on L1.4GHz (3σ upper limit) 76- 82 F7.3 10+24W/Hz L1.4GHz ?=- Integrated luminosities at 1.4GHz (6) 84- 85 I2 --- r_L1.4GHz ?=- Radio flux survey reference (5) 86 A1 --- Note [*] Duplicate line for RXC J0751.3+5012 (pair of galaxies)
Note (2): Most of these positions are those listed by Crawford et al. (1999, Cat. J/MNRAS/306/857) Note (3): Excepting for Abell 11, which is based on 0.5-2keV. These have been corrected to be consistent with a Hubble constant H0=70Mpc/km/s. Note (4): The ROSAT flux is contaminated by an AGN so the cluster X-ray luminosity is less than the number given here. Note (5): References as follows: 1 = David et al., 1999ApJ...519..533D, (Cat. J/ApJ/519/533); 2 = Bohringer et al., 2004A&A...425..367B, (Cat. J/A+A/425/367); 3 = Ebeling et al., 1998MNRAS.301..881E, (Cat. J/MNRAS/301/881); 4 = Ebeling et al., 2000MNRAS.318..333E, (Cat. J/MNRAS/318/333); 5 = Brinkmann et al., 1995A&AS..109..147B, (Cat. J/A+AS/109/147); 6 = Edge et al., 1990MNRAS.245..559E; 7 = SDSS Spectral line measurements (Cat. II/294); 8 = Tables 5 and 6 by Crawford et al., 1999MNRAS.306..857C, (Cat. J/MNRAS/306/857); 9 = Based on Paα fluxes measured by Edge et al., 2002MNRAS.337...49E; 10 = Table 1 by Jaffe et al., 2005MNRAS.360..748J, and an intrinsic Hα/Paα ratio of 8.46 for case B recombination at a temperature of 104K and a density of 100cm^-3-; 11 = NVSS survey (Condon et al., 1998AJ....115.1693C, Cat. VIII/65); 12 = FIRST survey (Becker et al., 1995ApJ...450..559B; White et al., 1997ApJ...475..479W, Cat. VIII/48 superseded by Cat. VIII/51). Note (6): The objects lacking luminosities were not at positions covered by either NVSS or FIRST surveys.
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 16 A16 --- Name Cluster designation 18 A1 --- n_Name [hij] Individual notes (G1) 20- 24 F5.2 mJy F3.6um IRAC 3.6um aperture photometry (2) 26- 30 F5.2 mJy F4.5um IRAC 4.5um aperture photometry (2) 32- 35 F4.2 mJy F5.8um IRAC 5.8um aperture photometry (2) 37- 41 F5.2 mJy F8um IRAC 8um aperture photometry (2) 43 A1 --- l_F24um Limit flag on 24um 44- 48 F5.2 mJy F24um IRAC 24um aperture photometry (2) 50 A1 --- l_F70um Limit flag on 70um 51- 53 I3 mJy F70um IRAC 70um aperture photometry
Note (2): Aperture photometry at 3.6, 4.5, 5.8, 8, and 24.4um were measured from the band 1-4 IRAC images and band 1 MIPS images. See text for aperture corrections details.
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 16 A16 --- Name Cluster designation 17 A1 --- n_Name [*] Luminous IR galaxy (G1) 19 A1 --- l_LIR Limit flag on LIR 20- 24 F5.2 10+37W LIR Estimated infrared luminosity of BCG (2) 25 A1 --- Note [*] Duplicate line for RXC J0751.3+5012 (pair of galaxies)
Note (2): Infrared luminosities are estimated from the flux at 15um for BCGs that are either detected at 70um, have color ratio F8um/F5.8um>1.0 or F24um/F8um>1.0. See section 3.3. The top section contains four BCGs that are suspected to harbor dusty Type II AGNs. Z2089, A2146 and A1068 exhibit a red F4.5um/F3.6um color and all four have high [OIII](5007)/Hβ flux ratios. The second set is the remaining 10 BCGs with F8um/F5.8um>1.3. The third section is the set of six clusters with 1.0<F8um/F5.8um<1.3. The fourth set is the remaining BCGs with IR excesses. Specifically, they have ratios F8um/F5.8um>1.0, F24um/F8um>1.0, or a detected 70um flux. The last section contains upper limits for the remaining objects.
Global Notes: Note (G1): Notes as follows: a = sources were extended and so the NVSS flux was used, not the FIRST flux b = sources had multiple components seen in the FIRST survey and these were added to estimate the total c = sources were extended in the NVSS images so fits images were used to integrate the total d = Objects with [NII] emission but no Hα reported by Crawford et al. (1999, Cat. J/MNRAS/306/857). e = Abell 4059 exhibits a similar spectrum with [NII] but no Hα as seen from the 6dFGS archive (Jones et al., 2004MNRAS.355..747J; Jones et al., 2005, Cat. VII/249). f = A3112 exhibits [OII] emission (Katgert et al., 1998, Cat. J/A+AS/129/399), but we have failed to find a report of its Hα emission. g = Through an oversight A2622 was included in the sample, as it lacks emission lines (Owen et al., 1995, Cat. J/AJ/109/14). h = RXC J0751.3+5012 contains a pair of bright elliptical galaxies, hence, two measurements are given, one for each galaxy. i = Abell 2627 is a galaxy pair; photometry is only given for the northern galaxy. j = RXC J0338.6+0958 has a nearby bright star which is adding to the uncertainty of the photometry. * = BCGs marked with an asterisk have LIR>1011L (4x1037W) and can be classified as LIRGs (luminous infrared galaxies)
History: From electronic version of the journal
(End) Emmanuelle Perret [CDS] 29-Jul-2009
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