On the influence of radio extended structures on offsets between the optical and VLBI positions of sources in the ICRF2

Details On the influence of radio extended structures on offsets between the optical and VLBI positions of sources in the ICRF2 On the influence of radio extended structures on offsets between the optical and VLBI positions of sources in the ICRF2

2011-05-03

arxiv.org/abs/1105.0662v1

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

Accepted on May 3rd 2011 by A&A

Scientific paper

Context: To investigate the differences between positions, as determined by optical (direct imaging) and Very Long Baseline Interferometry (VLBI) techniques, of extragalactic sources listed in the second realization of the International Celestial Reference Frame (ICRF2). Aims: To verify the influence of the source's intrinsic structure on these differences. Methods: Instruments with mosaics of CCDs were used to acquire the optical positions presented here, leading us to opt for overlapping techniques to build a virtual, continuous CCD over the whole angular size of the respective fields of view, whose translation of the resulting intrumental positions into positions that are consistent with those in the ICRF2 was made with the help of the UCAC2. Results: The differences obtained between the optical and VLBI positions of the observed sources may reach more than 80 milliarcseconds and, taking into consideration that they are hardly explained only by statistical fluctuations or systematic errors in the optical reference frame used here, we argue that these differences can be related to the sources' X-band structure index (8.4 GHz). Conclusions: In this context, the presence of the intrinsic structure should be taken into consideration when comparing the optical and VLBI positions of ICRF2 sources in the future.

Affiliated with

Also associated with

No associations

Rating

On the influence of radio extended structures on offsets between the optical and VLBI positions of sources in the ICRF2 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 On the influence of radio extended structures on offsets between the optical and VLBI positions of sources in the ICRF2, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and On the influence of radio extended structures on offsets between the optical and VLBI positions of sources in the ICRF2 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-694728