eCommons

 

Radio Transient Searches from Millisecond to Hour-long Time Scales

Other Titles

Abstract

Time-domain radio astronomy is a burgeoning field of study, with rapid event detection rates enabled by significant advancements in technology and computing power. Modern radio telescopes output large data rates of over 1 TB/hour, necessitating efficient automated pipelines for signal detection and follow-up. Leveraging state-of-the-art radio telescopes and supercomputing facilities, we conducted targeted searches for diverse astrophysical phenomena, including millisecond-duration radio bursts, pulsars, periodic transmissions from advanced extraterrestrial worlds, and hour-long star-planet interactions. Our prime sky regions of focus included the M87 galaxy and the Galactic Center (GC), which we surveyed for elusive bursts and periodic signals respectively. In addition, we investigated the mysterious radio emission of two objects, namely the GC magnetar PSR J1745—2900 and the nearby main-sequence star Epsilon Eridani. Our studies revealed a dearth of bursts from M87 and a non-detection of periodic signals from the GC, thus setting stringent population-level constraints on potential emitters in their respective environments. We successfully detected the GC magnetar, thereby providing conclusive evidence of its gradual weakening since 2015. Finally, we reported the discovery of 2–4 GHz continuum emission from Epsilon Eridani, thus tracing the origin of its decimeter-wave emission to thermal radiation from the stellar corona and chromosphere.

Journal / Series

Volume & Issue

Description

201 pages

Sponsorship

Date Issued

2023-08

Publisher

Keywords

Data-driven Astronomy; Periodic Signals; Pulsars; Radio Bursts; Radio Transients

Location

Effective Date

Expiration Date

Sector

Employer

Union

Union Local

NAICS

Number of Workers

Committee Chair

Cordes, James

Committee Co-Chair

Committee Member

Wasserman, Ira
Lai, Dong
Chernoff, David

Degree Discipline

Astronomy and Space Sciences

Degree Name

Ph. D., Astronomy and Space Sciences

Degree Level

Doctor of Philosophy

Related Version

Related DOI

Related To

Related Part

Based on Related Item

Has Other Format(s)

Part of Related Item

Related To

Related Publication(s)

Link(s) to Related Publication(s)

References

Link(s) to Reference(s)

Previously Published As

Government Document

ISBN

ISMN

ISSN

Other Identifiers

Rights

Attribution 4.0 International

Types

dissertation or thesis

Accessibility Feature

Accessibility Hazard

Accessibility Summary

Link(s) to Catalog Record