Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-09-02
A&A 489, L33-L36 (2008)
Astronomy and Astrophysics
Astrophysics
Accepted for publication in Astronomy & Astrophysics
Scientific paper
10.1051/0004-6361:200810423
We report a serendipitous detection of rapid, large amplitude flux density variations in the highly core-dominated, flat-spectrum radio quasar 1156+295 during an observing session at the Very Long Baseline Array (VLBA). The source was observed as a part of the MOJAVE survey programme with the VLBA at 15 GHz on February 5, 2007. Large amplitude variability in the correlated flux density, unexplainable in terms of the source structure, was first discovered while processing the data, and later confirmed by calibrating the antenna gains using 24 other sources observed in the experiment. The source shows variations in the correlated flux density as high as 40% on a timescale of only 2.7 hours. This places 1156+295 between the classical IDV sources and the so-called intra-hour variables. The observed variability timescale and the modulation index of 13% are consistent with interstellar scintillation by a nearby, highly turbulent scattering screen. The large modulation index at 15 GHz implies a scattering measure that is atypically high for a high galactic latitude source such as 1156+295.
Kovalev Yu. Yu.
Savolainen Tuomas
No associations
LandOfFree
Serendipitous VLBI detection of rapid, large-amplitude, intraday variability in QSO 1156+295 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 Serendipitous VLBI detection of rapid, large-amplitude, intraday variability in QSO 1156+295, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Serendipitous VLBI detection of rapid, large-amplitude, intraday variability in QSO 1156+295 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-61271