Computer Science
Scientific paper
Apr 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006atnf.prop..299b&link_type=abstract
ATNF proposal C1366, Semester: April, 2006
Computer Science
Extragalactic, Atca
Scientific paper
The unusually rapid interstellar scintillation of PKS 1257-326 provides us with a unique opportunity to probe the sub-pc scale structure and evolution of a quasar at z=1.256, addressing the longevity of very high-brightness emission regions in AGN. At the same time we probe small-scale structure in the local ionised interstellar medium of our own Galaxy. Previous observations in 2001-2003 have allowed us to measure the characteristic length scale and anisotropy of the scintillation pattern as well as the distance to the scattering medium. We find degenerate solutions for the scintillation velocity as a result of the large pattern anisotropy (axial ratio ~10:1). Measurement of the pattern arrival time delay between the VLA and ATCA around day of year 215 can break this degeneracy. This would allow us to accurately model the observed evolution of the multi-frequency, polarized microarcsecond-scale source structure, and compare directly with larger milliarcsecond-scale structure observed with VLBI. We request here the proposed remaining time for project C1366, 3x12 hour sessions to be coordinated with simultaneous VLA observations (to be requested for the Feb 1 NRAO proposal deadline).
Bignall Hayley
Carter Steve
Cimò Giuseppe
Ellingsen Simon
Jauncey David
No associations
LandOfFree
Microarcsecond-scale evolution of PKS 1257-326 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 Microarcsecond-scale evolution of PKS 1257-326, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Microarcsecond-scale evolution of PKS 1257-326 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1161646