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Science with the ngVLA: Extreme Scattering Events and Symmetric Achromatic Variations

Vedantham, H. K. (2018) Science with the ngVLA: Extreme Scattering Events and Symmetric Achromatic Variations. . (Unpublished) https://resolver.caltech.edu/CaltechAUTHORS:20190930-133838146

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Abstract

Radio variability in quasars has been seen on timescales ranging from days to years due to both intrinsic and propagation induced effects. Although separating the two is not always straight-forward, observations of singular `events' in radio light curves have led to two compelling, and thus far unresolved mysteries in propagation induced variability--- extreme scattering events (ESE) that are a result of plasma lensing by AU-scale ionized structures in the interstellar medium, and symmetric achromatic variability (SAV) that is likely caused by gravitational lensing by ≳10^3M⊙ objects. Nearly all theoretical explanations describing these putative lenses have remarkable astrophysical implications. In this chapter we introduce these phenomena, state the unanswered questions and discuss avenues to answer them with a ∼weekly-cadence flux-monitoring survey of 10^3−10^4 flat-spectrum radio quasars with the ngVLA.


Item Type:Report or Paper (Discussion Paper)
Related URLs:
URLURL TypeDescription
http://arxiv.org/abs/1810.07009arXivDiscussion Paper
ORCID:
AuthorORCID
Vedantham, H. K.0000-0002-0872-181X
Record Number:CaltechAUTHORS:20190930-133838146
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20190930-133838146
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:98961
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:30 Sep 2019 20:44
Last Modified:03 Oct 2019 21:46

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