2000ApJ...529L..65D


C.D.S. - SIMBAD4 rel 1.7 - 2020.01.24CET08:42:36

2000ApJ...529L..65D - Astrophys. J., 529, L65-L68 (2000/February-1)

The discovery of a microarcsecond quasar: J1819+3845.

DENNETT-THORPE J. and DE BRUYN A.G.

Abstract (from CDS):

We report on the discovery of a source that exhibits over 300% amplitude changes in radio flux density on the period of hours. This source, J1819+3845, is the most extremely variable extragalactic source known in the radio sky. We believe these properties are due to interstellar scintillation and show that the source must emit at least 55% of its flux density within a radius of fewer than 16 µas at 5 GHz. The apparent brightness temperature is greater than 5x1012 K, and the source may be explained by a relativistically moving source with a Doppler factor of ∼15. The scattering occurs predominantly in material only a few tens of parsecs from the Earth, which explains its unusually rapid variability. If the source PKS 0405-385 is similarly affected by local scattering material, Doppler factors of ∼1000 are not required to explain this source. The discovery of a second source whose properties are well modeled by interstellar scintillation strengthens the argument for this as the cause for much of the variation seen in intraday variables.

Abstract Copyright:

Journal keyword(s): ISM: General - Galaxies: Quasars: Individual: Alphanumeric: J1819+3845 - Radiation Mechanisms: Nonthermal

Simbad objects: 6

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Number of rows : 6

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 QSO B0405-385 QSO 04 06 59.03533560 -38 26 28.0423567   19.55 18.0     ~ 199 2
2 M 81 Sy2 09 55 33.17306143 +69 03 55.0609270   7.89 6.94     ~ 3916 5
3 3C 286 Sy1 13 31 08.2885060664 +30 30 32.960825108   17.51 17.25     ~ 3649 1
4 QSO B1741-038 QSO 17 43 58.85613396 -03 50 04.6166450     18.5 17.98   ~ 470 1
5 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 3324 3
6 ICRF J181926.5+384501 SyG 18 19 26.54737811 +38 45 01.7863328           ~ 106 0

    Equat.    Gal    SGal    Ecl

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2020.01.24-08:42:36

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