Monitoring the Microarcsecond Quasar J1819+3845

Details Monitoring the Microarcsecond Quasar J1819+3845 Monitoring the Microarcsecond Quasar J1819+3845

Oct 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001ap%26ss.278..101d&link_type=abstract

Astrophysics and Space Science, v. 278, Issue 1/2, p. 101-104 (2001).

Astronomy and Astrophysics

Astrophysics

14

Scientific paper

We present the results of a year-long monitoring campaign on J1819+3845. We interpret the results of this WSRT campaign to infer critical source parameters such as source lifetime and structure on tens of microarcseconds. The long lifetime of the source at such high brightness temperatures requires continuous energy injection or exotic emission processes. We have previously interpreted the extreme scintillation of J1819+3845 as due to a relatively nearby (~ 20 pc) scattering screen. We show this screen has a velocity w.r.t. the LSR of ~ 25 km s^-1, as measured by the changing scintillation properties throughout the year: the `velocity parallax'.

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