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J/ApJ/679/140      IR measurement of quasar obscuration        (Treister+, 2008)

Measuring the fraction of obscured quasars by the infrared luminosity of unobscured quasars. Treister E., Krolik J.H., Dullemond C. <Astrophys. J., 679, 140-148 (2008)> =2008ApJ...679..140T
ADC_Keywords: QSOs ; Photometry, SDSS ; Photometry, infrared ; Ultraviolet Keywords: galaxies: active - infrared: galaxies - quasars: general Abstract: Recent work has suggested that the fraction of obscured AGNs declines with increasing luminosity, but it has been difficult to quantify this trend. Here we attempt to measure this fraction as a function of luminosity by studying the ratio of mid-infrared to intrinsic nuclear bolometric luminosity in unobscured AGNs. Because the mid-infrared is created by dust reprocessing of shorter wavelength nuclear light, this ratio is a diagnostic of fobsc, the fraction of solid angle around the nucleus covered by obscuring matter. In order to eliminate possible redshift dependences while also achieving a large dynamic range in luminosity, we have collected archival 24um MIPS photometry from objects with z∼1 in the Sloan Digital Sky Survey DR5, the Great Observatories Origins Deep Survey, and the Cosmic Evolution Survey. To measure the bolometric luminosity for each object, we used archival optical data supplemented by GALEX data. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 115 206 Observed properties of sources in the SDSS sample table3.dat 115 14 Observed properties of sources in the COSMOS sample
See also: II/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009) II/284 : COSMOS Multi-Wavelength Photometry Catalog (Capak+, 2007) II/261 : GOODS initial results (Giavalisco+, 2004) J/ApJ/640/603 : Catalog of AGNs in the GOODS fields (Treister+, 2006) J/ApJS/172/383 : AGN candidates in the COSMOS field (Trump+, 2007) J/AJ/133/1780 : GALEX/SDSS quasar catalog (Trammell+, 2007) Byte-by-byte Description of file: table1.dat table3.dat
Bytes Format Units Label Explanations
1- 6 A6 --- Sample [SDSS/COSMOS] Name of sample 8- 26 A19 --- Name Name (SDSS for table1 or COSMOS for table3 JHHMMSS.ss+DDMMSS.s) 28- 32 F5.3 --- z Redshift (spectroscopic) 34- 39 F6.3 mag umag SDSS u band AB magnitude 41- 46 F6.3 mag gmag SDSS g band AB magnitude 48- 53 F6.3 mag rmag SDSS r band AB magnitude 55- 60 F6.3 mag imag SDSS i band AB magnitude 62- 67 F6.3 mag zmag SDSS z band AB magnitude 69 A1 --- l_F24um Upper limit flag on F24um 70- 74 F5.3 fW/m2 F24um Spitzer/MIPS 24 micron band flux (1) 76- 80 F5.3 fW/m2 FNUV GALEX NUV band flux (1) 82- 86 F5.3 fW/m2 E_FNUV ? Upper 1sigma bound on FNUV (1) 88- 92 F5.3 fW/m2 e_FNUV ? Lower 1sigma bound on FNUV (1) 94- 98 F5.3 fW/m2 FFUV GALEX FUV band flux (1) 100-104 F5.3 fW/m2 E_FFUV ? Upper 1sigma bound on FFUV (1) 106-110 F5.3 fW/m2 e_FFUV ? Lower 1sigma bound on FFUV (1) 112-115 F4.1 [10-7W] Lbol Log of the bolometric luminosity
Note (1): fluxes are expressed in 10-12erg/cm2/s = 10-15W/m2
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 22-Sep-2010
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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