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A Dramatic (and Invisible!) flare in NRAO 530 3 mm λ VLBI Observations

Published online by Cambridge University Press:  25 May 2016

Geoffrey C. Bower
Affiliation:
UC Berkeley Radio Astronomy Lab 601 Campbell, Berkeley CA 94720 USA
Don Backer
Affiliation:
UC Berkeley Radio Astronomy Lab 601 Campbell, Berkeley CA 94720 USA
Rick Forster
Affiliation:
UC Berkeley Radio Astronomy Lab 601 Campbell, Berkeley CA 94720 USA
Melvin Wright
Affiliation:
UC Berkeley Radio Astronomy Lab 601 Campbell, Berkeley CA 94720 USA

Extract

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3 mm λ VLBI observations of the extremely flat spectrum QSO NRAO 530 at the peak of its brightest recorded flare show a resolved core only slightly changed from its pre-outburst state. Observations with Haystack, Kitt Peak and Owens Valley observatories in April 1994, prior to the onset of the flare found a single component with Tb = 8 × 1010 K. One year later, within one week of the peak of flare at 3 mm λ, observations with Haystack, Kitt Peak and Hat Creek observatories revealed a component comparable in size and flux density with Tb = 7 × 1010 K. Table 1 details the source models for the two experiments.

Type
Properties of Radio Sources
Copyright
Copyright © Kluwer 1996