High frequency VLBI observations of the scatter broadened quasar B2005+403

Astronomy and Astrophysics – Astrophysics

Scientific paper

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

18 pages, 9 figures, 8 tables, accepted for publication in Astronomy and Astrophysics

Scientific paper

10.1051/0004-6361:20054017

The quasar B2005+403 located behind the Cygnus region, is a suitable object for studying the interplay between propagation effects, which are extrinsic to the source and source intrinsic variability. On the basis of VLBI experiments performed at 1.6, 5, 8, 15, 22, and 43GHz between 1992-2003 and parallel multi-frequency monitoring of the total flux density, we investigated the variability of total flux density and source structure. Below 8 GHz, the point-like VLBI source is affected by scatter-broadening of the turbulent interstellar medium, which is located along the line of sight and likely associated with the Cygnus region. We present and discuss the measured frequency dependence of the source size, which shows a power-law with slope of -1.91+/-0.05. From the measured scattering angle at 1GHz of 77.1+/-4.0mas a SM=0.43+/-0.04 m^{-20/3} kpc is derived, consistent with the general properties of the ISM in this direction. The decreasing effect of angular broadening towards higher frequencies allows to study the internal structure of the source. Above 8GHz new VLBI observations reveal a one-sided slightly south-bending core-jet structure, with stationary and apparent superluminally moving jet components. The jet components move on non-ballistic trajectories. In AGN, total flux density variations are often related to the emergence of new VLBI components. However, during almost eleven years no new component was ejected in B2005+403. In the flux density variability a trough is observed at 5-37 GHz between 1996 and 2001. This can be explained as a blending effect of jet component fluxes. Dense in time sampled flux density monitoring observations reveal intra-day variability at 1.6GHz impling a second, less dense or turbulent scattering screen at few to hundred parsec distance.

No associations

LandOfFree

Say what you really think

Search LandOfFree.com for scientists and scientific papers. Rate them and share your experience with other people.

Rating

High frequency VLBI observations of the scatter broadened quasar B2005+403 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with High frequency VLBI observations of the scatter broadened quasar B2005+403, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High frequency VLBI observations of the scatter broadened quasar B2005+403 will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFWR-SCP-O-228657

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.