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J/MNRAS/383/1513    2MASS, SDSS and FIRST fluxes of QSOs     (Labita+, 2008)

The near-infrared to ultraviolet continuum of radio-loud versus radio-quiet quasars. Labita M., Treves A., Falomo R. <Mon. Not. R. Astron. Soc., 383, 1513-1518 (2008)> =2008MNRAS.383.1513L
ADC_Keywords: QSOs ; Photometry, infrared ; Photometry, SDSS ; Redshifts Keywords: galaxies: active - galaxies: nuclei- quasars: general Abstract: Starting from a sample of Sloan Digital Sky Survey quasars appearing also in the Two-Micron All-Sky Survey, we study the continuum properties of ∼1000 objects observed in eight bands, from near-infrared to ultraviolet. We construct the mean spectral energy distribution (SED) and compare and contrast the continua of radio-loud and radio-quiet quasar (RLQ and RQQ, respectively) objects. The SEDs of the two populations are significantly different, in the sense that RLQs are redder with power-law spectral indices <alphaRLQ≥0.55±0.04 and <alphaRQQ≥0.31±0.01 in the spectral range between 1014.5 and 1015.35Hz. This difference is discussed in terms of different extinctions, different disc temperatures, or slopes of the non-thermal component. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 103 887 Monochromatic fluxes are derived from SDSS, 2MASS and FIRST and corrected for Galactic extinction
See also: II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) VIII/71 : The FIRST Survey Catalog, Version 03Apr11 (Becker+ 2003) : SDSS Home Page Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 7 F7.3 deg RAdeg Right ascension in decimal degrees (J2000) 9- 15 F7.3 deg DEdeg Declination in decimal degrees (J2000) 17- 21 F5.3 --- z Redshift 23- 29 E7.3 Jy Fu SDSS u band flux 31- 37 E7.3 Jy Fg SDSS g band flux 39- 45 E7.3 Jy Fr SDSS r band flux 47- 53 E7.3 Jy Fi SDSS i band flux 55- 61 E7.3 Jy Fz SDSS z band flux 63- 69 E7.3 Jy FJ 2MASS J band flux 71- 77 E7.3 Jy FH 2MASS H band flux 79- 85 E7.3 Jy FK 2MASS K band flux 87 A1 --- l_F20cm Limit flag on F20cm 88- 94 E7.3 Jy F20cm FIRST 20cm flux 96 A1 --- l_R(r-o) Limit flag on R(r-o) 97-103 F7.2 --- R(r-o) Ratio between radio and optical fluxes (1)
Note (1): The distinction between RLQ and RQQ objects is usually made referring to the ratio between the radio and optical flux. Here, we assume that a quasi-stellar object (QSO) is radio loud if R(r-o)=[Fnu(1.5x109Hz)]/[Fnu(6x1014Hz]>10 (20cm/0.5µm) and radio quiet otherwise.
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 05-May-2008
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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