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J/MNRAS/393/1408    IR photometry of type II quasars         (Chen+, 2009)

Infrared photometric study of type II quasars. Chen P.S., Shan H.G. <Mon. Not. R. Astron. Soc., 393, 1408-1422 (2009)> =2009MNRAS.393.1408C
ADC_Keywords: QSOs ; Photometry, infrared Keywords: galaxies: photometry - quasars: general - infrared: galaxies Abstract: For this paper, we collected almost all of the type II quasars so far discovered. Among them, 485 sources have photometric data at JHK bands, mainly from Two-Micron All-Sky Survey observations, 65 sources have IRAS photometric data in at least one of the three IRAS bands at 25, 60 and 100um and 15 sources have IRAS photometric data in all three IRAS bands. We find that in nearly half of all type II quasars, both the near- and far-infrared radiations are dominated by starlight or thermal reprocessing of starlight by dust in the underlying galaxy. The infrared radiation of the other group (slightly over half) is dominated by a non-thermal radiation in the near-infrared, and mostly in the far-infrared also (although there is a mixture particularly for the longer wavelengths). It is proposed that for the later group, hidden broad lines may exist in the infrared. On the basis of our and previous results, we also discuss the possibility that there are two distinct classes of type II quasars: 'true' type II quasars without a broad-line region and heavily obscured type I quasars, in full analogy with the case for type II Seyfert galaxies. No relationships can be found for either the near-infrared or the far-infrared colours and the redshift. Correlations between absolute magnitude in the near- and far-infrared with redshift are found, but could be due to a flux limit (Malmquist bias). Description: We collected about 1000 type II quasars from the literature. Among them, 485 sources listed in Table 1 have photometric data at JHK bands. In addition, 65 sources listed in Table 2 have IRAS photometric data in at least one of three IRAS bands. Those sources are our working sample. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 115 485 Near-infrared observation of type II quasars refs.dat 68 20 References table2.dat 58 65 IRAS observation of type II quasars
See also: II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) J/AJ/126/2125 : SDSS candidate type II quasars (Zakamska+, 2003) J/AJ/128/1002 : SDSS candidate type II quasars. II (Zakamska+, 2004) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 3 I3 --- Seq ? Sequential number, from Reyes et al. 2008AJ....136.2373R 5- 20 A16 --- Name Name 22- 27 F6.4 --- z Redshift 29- 30 I2 h RAh Right ascension (J2000) 32- 33 I2 min RAm Right ascension (J2000) 35- 39 F5.2 s RAs Right ascension (J2000) 41 A1 --- DE- Declination sign (J2000) 42- 43 I2 deg DEd Declination (J2000) 45- 46 I2 arcmin DEm Declination (J2000) 48- 51 F4.1 arcsec DEs Declination (J2000) 52 A1 --- r [r] indicates coordinates from the original reference 54- 59 F6.3 mag Jmag ? J magnitude 61- 65 F5.3 mag e_Jmag ? rms uncertainty on Jmag 67- 72 F6.3 mag Hmag ? H magnitude 74- 78 F5.3 mag e_Hmag ? rms uncertainty on Hmag 80- 85 F6.3 mag Kmag K magnitude 87- 91 F5.3 mag e_Kmag ? rms uncertainty on Kmag 93- 96 F4.2 mag E(B-V) Colour excess 98 A1 --- n_Notes [*] * indicates source located near the power-law distribution of Fig. 1 100-115 A16 --- Notes Notes (1)
Note (1): Notes with references in refs.dat file
Byte-by-byte Description of file: refs.dat
Bytes Format Units Label Explanations
1- 2 I2 --- Ref Reference number 4- 22 A19 --- BibCode BibCode 24- 47 A24 --- Aut Author's name 49- 68 A20 --- Com Comments
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 3 I3 --- Seq ? Sequential number 5- 20 A16 --- Name Name 22- 27 F6.4 --- z Redshift 30- 40 A11 --- IRAS IRAS name 42- 46 F5.3 Jy F25 ? IRAS flux at 25um 48- 52 F5.3 Jy F60 IRAS flux at 60um 54- 58 F5.3 Jy F100 ? IRAS flux at 100um
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 25-Oct-2009
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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