J/A+A/478/321 QSO Type1/Type2 dichotomy (Borguet+, 2008)
Evidence of a Type1/Type2 dichotomy in the correlation between quasar optical
polarization and host galaxy/extended emission position angles.
Borguet B., Hutsemekers D., Letawe G., Letawe Y., Magain P.
<Astron. Astrophys. 478, 321 (2008)>
=2008A&A...478..321B 2008A&A...478..321B
ADC_Keywords: QSOs ; Polarization ; Radio sources ; Morphology
Keywords: galaxies: quasars: general ; polarization
Abstract:
For Seyfert galaxies, the AGN unification model provides a simple and
well-established explanation of the type 1/type 2 dichotomy through
orientation-based effects. The generalization of this unification
model to the higher luminosity AGNs that quasars are remains a key
question. The recent detection of type 2 radio-quiet quasars seems to
support such an extension. We propose a further test of this scenario.
On the basis of a compilation of quasar host-galaxy position angles
consisting of previously published data and of new measurements
performed using HST Archive images, we investigate the possible
existence of a correlation between the linear polarization position
angle and the host-galaxy/extended emission position angle of quasars.
Description:
This table contains the measurements/compilation of host galaxy/
extended emission position angle in the visible and near-IR domain,
polarimetric data, and radio axis orientation for the 135 quasars of
our sample. The angles are given in degrees east of north. The table
gives the spectral and the radio-loud/radio-quiet classification of
each object according to the references.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table6.dat 140 135 Morphology/polarimetric/radio measurements for
135 quasars
refs.dat 66 44 References
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See also:
J/ApJS/122/81 : HST snapshot survey of 3CR radio sources (Martel+, 1999)
J/A+AS/142/451 : Optical Polarization of 47 QSOs (Lamy+, 2000)
J/ApJ/569/23 : Optical polarisation of 2MASS QSOs (Smith+, 2002)
Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1- 23 A23 --- Name Quasar name
25- 26 I2 h RAh Right ascension (J2000)
28- 29 I2 min RAm Right ascension (J2000)
31- 34 F4.1 s RAs Right ascension (J2000)
36 A1 --- DE- Declination sign
37- 38 I2 deg DEd Declination (J2000)
40- 41 I2 arcmin DEm Declination (J2000)
43- 44 I2 arcsec DEs Declination (J2000)
47- 51 F5.3 --- z Redshift
53- 55 A3 --- Type QSO type (1)
58- 61 F4.2 --- b/av ? Axial ratio in visible domain (2)
63- 65 I3 deg PAv ? Host/extended emission position angle (E of N)
67- 71 A5 --- Filtv Filter's name (3)
73- 76 A4 --- r_b/av (b/av)/PAv references, in refs.dat file
79- 82 F4.2 --- b/ai ? Axial ratio in near-IR domain (2)
84- 86 I3 deg PAi ? Host/extended emission position angle (E of N)
88- 92 A5 --- Filti Filter's name (3)
94- 97 A4 --- r_b/ai (b/ai)/PAi references, in refs.dat file
99-103 F5.2 % Pol Optical polarization degree
105-108 F4.2 % e_Pol Uncertainty on polarization degree
110-112 I3 deg PApol Optical polarization position angle
114-115 I2 deg e_PApol Uncertainty on polarization position angle
117-120 A4 --- r_Pol Polarization data reference, in refs.dat file
123-125 I3 deg PArad ? Radio jet position angle
127-140 A14 --- r_PArad Radio jet references, in refs.dat file
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Note (1): Types as follows:
RQ1 = Type1 radio-quiet quasar
RQ2 = Type2 radio-quiet quasar
RL1 = Type1 radio-loud quasar
RL2 = Type2 radio-loud quasar (NLRG)
Note (2): Axial ratio in visible domain:
* we put b/a=1.01 when the quality criterion = 2, because the
corresponding PA_host is not certain (see Sect.3 for more details).
* no Vis or near-IR PA_host measurement is provided when quality
the criterion = 3
* the b/a from Lehnert et al. (1999ApJS..123..351L 1999ApJS..123..351L) are arbitrarily
set to b/a=0.9 since no b/a were provided in that paper.
Note (3): Name of the HST filter/band
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- Ref Reference code
6- 24 A19 --- BibCode BibCode
26- 44 A19 --- Aut Author's name
46- 66 A21 --- Com Comments
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History:
* 17-Jan-2008: First version
* 03-Mar-2008: 3 filters "Filtv" corrected in table1
Acknowledgements:
Benoit Borguet, B.Borguet(at)ulg.ac.be
(End) B. Borguet [University of Liege (Belgium)], P. Vannier [CDS] 27-Nov-2007