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 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 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