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Searching for Persistent Radio Sources


Seebeck, Jerome John (2022) Searching for Persistent Radio Sources. Senior thesis (Major), California Institute of Technology. doi:10.7907/4aj5-gv39.


We present a sample of 27 sources from the Very Large Array Sky Survey (VLASS) associated with dwarf galaxies as possible persistent radio sources (PRS). This thesis presents a novel approach of high offset associations between radio sources and optical counterparts from the Galaxy List for the Advanced Detector Era+ (GLADE+) through the use of the Bayesian association algorithm Probabilistic Association of Transients to their Hosts (PATH). We follow up on this sample with SED fitting through UV, optical, and IR photometry to garner accurate star formation and stellar masses for the sample. We use this data to search for high luminosity (excess Lν ≥ 10²⁹ ergs⁻¹ Hz-1), high offset (> 2"), and high association probability (P(O|x) ≥ 0.93) sources for follow up. Our goal for further follow up is to eliminate possible astrophysical foreground such as AGN, SNe, and star formation as explanation for these sources. We follow up with Keck Low Resolution Imaging Spectrometer (LRIS) optical spectra of 2 sources and find no evidence of AGN activity. We also discuss our VLBA proposal for 11 of our sources to search for compactness of source radio emission, a feature of PRS. Additional follow-up spectroscopy and radio observations are necessary to confirm any of these candidates and PRS due to the large number of foregrounds and this thesis presents a possible list of 27 candidates within VLASS in order to do so.

Item Type:Thesis (Senior thesis (Major))
Subject Keywords:High-Energy Transients
Degree Grantor:California Institute of Technology
Division:Physics, Mathematics and Astronomy
Major Option:Astrophysics
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Law, Casey (co-advisor)
  • Ravi, Vikram (co-advisor)
Thesis Committee:
  • Ravi, Vikram (chair)
  • Connor, Liam
  • Law, Casey
  • Simard, Dana
Defense Date:3 June 2022
Record Number:CaltechTHESIS:06032022-212228226
Persistent URL:
Seebeck, Jerome John0000-0002-4014-9067
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:14941
Deposited By: Jerome Seebeck
Deposited On:08 Jun 2022 18:27
Last Modified:04 Aug 2022 23:33

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