The search for variable quasars and galaxies suitable for cosmological radio measurements: quasar 0235+16

Details The search for variable quasars and galaxies suitable for cosmological radio measurements: quasar 0235+16 The search for variable quasars and galaxies suitable for cosmological radio measurements: quasar 0235+16

Jan 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994astl...20....3k&link_type=abstract

Astronomy Letters, Volume 20, Issue 1, January 1994, pp.3-7; Pis'ma v Astronomicheskii Zhurnal, Vol. 20, p. 7

Astronomy and Astrophysics

Astronomy

5

Scientific paper

The first results of the search for extragalactic radio sources suitable for cosmological measurements are presented. The sequence of outbursts, observed in quasar 0235+16 over 1.5 years (from July 1981 to December 1982) at eight frequencies ranging from 0.3 to 15 GHz, is analyzed with the aid of the "hedgehog" model. The simulated spectra agree with the observed spectra using a X^2^-test at a 0.05 significance level (or a 0.95 confidence level). The observed phenomena are interpreted as synchrotron emission from a continuous narrow jet of relativistic particles moving in a strong radial magnetic field; the variability of the spectrum is caused by the time variation of the flow. The jet starts at a distance of 10^19^ cm from the active nucleus. The observed brightness temperature and magnetic field near the jet base were estimated to be less than 4 x 10^11^ K and 0.5 G, respectively. The BL Lacertae object 0235+16 can be used for radio measurements of the Hubble constant and the deceleration parameter of the Universe by the previously proposed technique based on the hedgehog model.

Affiliated with

Also associated with

No associations

Rating

The search for variable quasars and galaxies suitable for cosmological radio measurements: quasar 0235+16 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 The search for variable quasars and galaxies suitable for cosmological radio measurements: quasar 0235+16, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The search for variable quasars and galaxies suitable for cosmological radio measurements: quasar 0235+16 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-866476