Jets polarization and spectral properties of 18 gamma-ray quasars

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Jets polarization and spectral properties of 18
gamma-ray quasars

• Yu.N.Vetukhnovskay, V.E. Yakimov , D.Gabuzda

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Observations VLBA ,frequencies 5 and 15 GHz, two
circular polarizations.
Calibration AIPS usual tasks.
Images AIPS,
DIFMAP .
Model fitting DIFMAT, VISFIT


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name z name z
name z

• 0202149 0.405 0.827247 0.941 1611343
  1.401
• 0234285 1.207 1156295 0.729 1633382
  1.807
• 0420-014 0.915 1222216 0.435 1739522
  1.381
• 0446112 1.207 1406-076 1.494
  1741-038 1.054
• 0528134 2.070 1510-089 0.360
  2022-077 1.388
• 0804499 1.432 1606106 1.226 2230114
  1.037

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1741-038 is optically thick (Kovalev et al, 1999)
The core and
jet of 0202149 is unpolarized at 15 GHz (lt0.5)
At 15 GHz jet of 2022-077 is also
unpolarized (lt0.3)

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1741-038 at 5 and 15 GHz
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0202149 15 GHz 2022-077 15
GHz
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The jets of of gamma-ray-quasars may be extent
(1606106 and 2230114)
The
length of jet of 1611343 is the same from 5 to
43 Ghz Spine-sheath polarization structure of
1606106
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1633382, 5 GHz 2230114, 5 GHz
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1606106 at 15 GHz and 5 GHz
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The fractional polarization of the components
for models of quasars may be gt30. Components I
and P not always coincide.

In grey colour for 1611343 and 1633382
the fractional polarization distribution at two
frequencies.
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FPOL 1611343 at 5 and 15 GHz
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FPOL 1633382 at 15 and 5 GHz
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Definition of the Rotation Measure for two
frequencies is not correct, but it is sometimes
interesting. Example - RM for 1633382
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The AIPS task COMB was used for spectral index
definition. The core position for 5 and 15
GHZ are different (Lobanov,1998 and
references therein Pushkarev et al, 2008)
Maps at two frequencies with
the same beam width. Model
fitting and optically thin components at two
maps.
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0202149 (dr0.82mas)
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Spectral index 0234285 (dr043mas)
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Spectal index 1611343 (dr0.40mas)
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1633382 (dr0.73)
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1406-076 (dr0.13mas) 2230114 (dr0.94mas)
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The core shifts
0202149 0.82 mas 1606106
0.37 mas 0234285 0.43 mas
1611343 0.40 mas 0827243 0.00 mas
1633382 0.73 mas 1222216 0.64 mas
2230114 0.94 mas 1406-076 0.13
mas
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Brightness temperatures distribution along the
jets.
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Thank you