A1 Refereed original research article in a scientific journal
Symmetric Achromatic Variability in Active Galaxies: A Powerful New Gravitational Lensing Probe?
Authors: Vedantham HK, Readhead ACS, Hovatta T, Pearson TJ, Blandford RD, Gurwell MA, Lahteenmaki A, Max-Moerbeck W, Pavlidou V, Ravi V, Reeves RA, Richards JL, Tornikoski M, Zensus JA
Publisher: IOP PUBLISHING LTD
Publication year: 2017
Journal: Astrophysical Journal
Journal name in source: ASTROPHYSICAL JOURNAL
Journal acronym: ASTROPHYS J
Article number: ARTN 89
Volume: 845
Issue: 2
Number of pages: 16
ISSN: 0004-637X
eISSN: 1538-4357
DOI: https://doi.org/10.3847/1538-4357/aa745c
Abstract
We report the discovery of a rare new form of long-term radio variability in the light curves of active galaxies (AG) -symmetric achromatic variability (SAV)-a pair of opposed and strongly skewed peaks in the radio flux density observed over a broad frequency range. We propose that SAV arises through gravitational milli-lensing when relativistically moving features in AG jets move through gravitational lensing caustics created by 10(3)-10(6) M-circle dot subhalo condensates or black holes located within intervening galaxies. The lower end of this mass range has been inaccessible with previous gravitational lensing techniques. This new interpretation of some AG variability can easily be tested and if it passes these tests, will enable a new and powerful probe of cosmological matter distribution on these intermediate-mass scales, as well as provide, for the first time, micro-arcsecond resolution of the nuclei of AG-a factor of 30-100 greater resolution than is possible with ground-based millimeter very-long-baseline interferometry.
We report the discovery of a rare new form of long-term radio variability in the light curves of active galaxies (AG) -symmetric achromatic variability (SAV)-a pair of opposed and strongly skewed peaks in the radio flux density observed over a broad frequency range. We propose that SAV arises through gravitational milli-lensing when relativistically moving features in AG jets move through gravitational lensing caustics created by 10(3)-10(6) M-circle dot subhalo condensates or black holes located within intervening galaxies. The lower end of this mass range has been inaccessible with previous gravitational lensing techniques. This new interpretation of some AG variability can easily be tested and if it passes these tests, will enable a new and powerful probe of cosmological matter distribution on these intermediate-mass scales, as well as provide, for the first time, micro-arcsecond resolution of the nuclei of AG-a factor of 30-100 greater resolution than is possible with ground-based millimeter very-long-baseline interferometry.
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