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J/ApJS/195/15           Luminosity profiles of BCGs            (Donzelli+, 2011)

The luminosity profiles of brightest cluster galaxies. Donzelli C.J., Muriel H., Madrid J.P. <Astrophys. J. Suppl. Ser., 195, 15 (2011)> =2011ApJS..195...15D
ADC_Keywords: Clusters, galaxy ; Magnitudes, absolute ; Galaxies, photometry Keywords: galaxies: clusters: general - galaxies: elliptical and lenticular, cD - galaxies: interactions Abstract: We have derived detailed R-band luminosity profiles and structural parameters for a total of 430 brightest cluster galaxies (BCGs), down to a limiting surface brightness of 24.5mag/arcsec2. Light profiles were initially fitted with a Sersic's R1/n model, but we found that 205 (∼48%) BCGs require a double component model to accurately match their light profiles. The best fit for these 205 galaxies is an inner Sersic model, with indices n∼1-7, plus an outer exponential component. Thus, we establish the existence of two categories of the BCG luminosity profiles: single and double component profiles. We found that double profile BCGs are brighter (∼0.2mag) than single profile BCGs. From a subsample of 24 BCGs, we found strong evidence that extra-light at intermediate radii in double profile BCGs is related to the presence of a faint stellar envelope. Similarly, from another subsample of 12 BCGs we also found that extra-light is related to star formation. Description: BCG images used in this work were provided by M. Postman (STScI) who kindly gave us access to the raw data. They were obtained under photometric conditions using the KPNO 2.1m and 4m telescopes, and the CTIO 1.5m telescope between 1989 November and 1995 April over a total of 13 observing runs. All the images were acquired in the Kron-Cousins Rc band and have typically exposure times of 200-600s. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 97 430 BCGs photometrical parameters
See also: VII/165 : Measured Redshifts of Abell Clusters of Galaxies (Andernach 1991) VII/87 : Data on 1889 Abell's clusters of galaxies (Leir+ 1977) J/AJ/125/478 : HST imaging of brightest cluster galaxies (Laine+, 2003) J/ApJ/440/28 : Brightest Cluster Galaxies velocities (Postman+ 1995) J/ApJ/425/418 : Absoulue R mag of brightest clusters galaxies (Lauer+, 1994) J/ApJ/241/486 : Absolute magnitudes in 116 nearby Abell clusters (Hoessel+, 1980) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 5 A5 --- Name Abell cluster name (ANNNN) 7- 11 F5.2 mag/arcsec2 mue Effective surface magnitude (in Rc band) 13- 18 F6.2 kpc re Effective radius (in Rc band) 20- 23 F4.2 --- n Sersic n parameter 25- 29 F5.2 mag/arcsec2 mu0 ? Central Rc surface magnitude 31- 35 F5.2 kpc r0 ? Scale length 37- 42 F6.2 mag MAGS Absolute magnitude of the Sersic component 44- 49 F6.2 mag MAGexp ?=0 Absolute Rc magnitude of the exponential component 51- 56 F6.2 mag MAGtot Total Rc absolute magnitude of the BCG 58- 62 F5.2 --- S/e ? Sersic to exponential component light ratio 64- 67 F4.2 --- alpha The α parameter (1) 69- 72 F4.2 --- elli Inner ellipticity (2) 74- 77 F4.2 --- ello Outer ellipticity (2) 79- 83 F5.1 --- PAi Inner position angle of the isophote (2) 85- 90 F6.1 --- PAo Outer position angle of the isophote (2) 92- 97 F6.2 mag MAGM Metric absolute magnitude, calculated at r=14.5kpc
Note (1): The logarithmic slope of the metric luminosity or α parameter which is defined as: α=d(log(Lm))/d(log(rm)), where Lm is the total BCG luminosity within a circular aperture of radius rm centered on the BCG nucleus. Following Postman & Lauer (1995, Cat. J/ApJ/440/28) we have calculated this parameter at r=14.5kpc. Note (2): The inner ellipticity (measured at 10"), outer ellipticity (measured at ∼23-24mag/arcsec2), and inner and outer position angles of the isophotes where the ellipticities are measured. Position angles are from north to east and the typical observed errors are ∼5°, while typical errors for ellipticities are 0.06.
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 19-Sep-2011
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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