J/other/NewA/11.557 Infrared photometry of BL Lac objects (Chen+, 2006)
On the difference between the X-ray selected and the radio selected BL Lac
objects in the near infrared.
Chen P.S., Shan H.G., Gao Y.F.
<New Astronomy, 11, 557-566 (2006)>
=2006NewA...11..557C 2006NewA...11..557C
ADC_Keywords: BL Lac objects ; Infrared sources ; Photometry, infrared
Keywords: galaxy: AGN, BL Lac object - infrared: galaxy
Abstract:
By using results from the 2MASS observation, the differences between
the X-ray selected BL Lac objects (XBLs) and the radio selected ones
(RBLs) in the near infrared are discussed in this paper. It is found
that, statistically, the RBLs have redder near infrared colors and
steeper spectral indices in the near infrared than XBLs, whereas the
XBLs have more influences from their host galaxies than the RBLs. It
is also seen that the RBLs have much brighter luminosity in the near
infrared than the XBLs. In addition, the high polarization
characteristics are found in common for RBLs, but not for XBLs.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 70 44 2MASS observations of the non-radio BL Lac objects
table2.dat 70 165 2MASS observations of BL Lac objects in the
ROSAT catalog
table3.dat 70 60 2MASS observations of BL Lac objects in the
PKS catalog
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See also:
VII/235 : Quasars and Active Galactic Nuclei (11th Ed.) (Veron+, 2003)
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
IX/10 : ROSAT All-Sky Bright Source Catalogue (1RXS) (Voges+ 1999)
IX/29 : ROSAT All-Sky Survey Faint Source Catalog (Voges+ 2000)
IX/31 : The WGACAT version of ROSAT sources (White+ 2000)
VIII/15 : Parkes Radio Sources Catalogue (PKSCAT90) (Wright+ 1990)
J/other/NewA/11.27 : 2MASS observation of BL Lac objects (Chen+, 2005)
Byte-by-byte Description of file: table?.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq Sequential number from Veron et al. (VII/235)
5- 21 A17 --- Name Source name
23- 27 F5.2 mag Vmag ? V magnitude
29 A1 --- l_Jmag Limit flag on Hmag
30- 35 F6.3 mag Jmag 2MASS J magnitude
37 A1 --- l_Hmag Limit flag on Hmag
38- 43 F6.3 mag Hmag 2MASS H magnitude
45 A1 --- l_Kmag Limit flag on Kmag
46- 51 F6.3 mag Kmag 2MASS K magnitude
53 A1 --- l_alpha Limit flag on alpha
54- 58 F5.2 --- alpha Spectral index between J and K bands
60- 64 F5.3 --- z ? Redshift
66- 68 A3 --- Type [BL? HP p] Type of object (1)
70 A1 --- Host [#] #: possible influence from the host galaxy
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Note (1): Type as follows:
BL = confirmed BL Lac object
BL? = probable BL Lac object
p = possible BL Lac object
? = questionable BL Lac object
HP = highly polarized BL Lac object
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 02-Nov-2006