2008A&A...488..905G


Query : 2008A&A...488..905G

2008A&A...488..905G - Astronomy and Astrophysics, volume 488, 905-914 (2008/9-4)

The jet of Markarian 501 from millions of Schwarzschild radii down to a few hundreds.

GIROLETTI M., GIOVANNINI G., COTTON W.D., TAYLOR G.B., PEREZ-TORRES M.A., CHIABERGE M. and EDWARDS P.G.

Abstract (from CDS):

The TeV BL Lac object Markarian 501 is a complex, core dominated radio source, with a one sided, twisting jet on parsec scales. In the present work, we attempt to extend our understanding of the source physics to regions of the radio jet which have not been accessed before. We present new observations of Mrk 501 at 1.4 and 86GHz. The 1.4GHz data were obtained using the Very Large Array (VLA) and High Sensitivity Array (HSA) in November 2004, in full polarization, with a final rms noise of 25µJy/beam in the HSA total intensity image; the 86 GHz observations were performed in October 2005 with the Global Millimeter VLBI Array (GMVA), providing an angular resolution as good as 110µasx40µas. The sensitivity and resolution provided by the HSA make it possible to detect the jet up to ∼700 milliarcseconds (corresponding to a projected linear size of ∼500pc) from its base, while the superior resolution of the 86GHz GMVA observations probes the innermost regions of the jet down to ∼200 Schwarzschild radii. The brightness temperature at the jet base is in excess of 6x1010K. We find evidence of limb brightening on physical scales from ≲1pc to ∼40pc. Polarization images and fits to the trend of jet width and brightness vs. distance from the core reveal a magnetic field parallel to the jet axis.

Abstract Copyright:

Journal keyword(s): galaxies: active - galaxies: nuclei - galaxies: jets - galaxies: BL Lacertae objects: individual: Markarian 501

Simbad objects: 7

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Number of rows : 7
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 7C 1144+3517 BLL 11 47 22.1297825184 +35 01 07.538786184   17.89 16.83 10.26   ~ 164 1
2 M 87 BiC 12 30 49.42338230 +12 23 28.0438581 10.16 9.59 8.63   7.49 ~ 6644 3
3 3C 286 Sy1 13 31 08.2883506368 +30 30 32.960091564   17.51 17.25     ~ 4059 2
4 QSO B1404+286 BLL 14 07 00.3941769384 +28 27 14.692128372   16.13 15.35 10.29   ~ 724 2
5 NGC 5532 LIN 14 16 52.9370483064 +10 48 26.616631104   13.3 12.59     ~ 334 3
6 3C 345 QSO 16 42 58.8102993888 +39 48 37.002763188   16.81 16.59 16.84   ~ 1615 2
7 4C 39.49 BLL 16 53 52.2160772976 +39 45 36.613228860 14.09 14.15 13.29 8.26   ~ 2016 2

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2022.05.21-04:05:24

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