GPS in the cosmos
Gopal-Krishna (UM/DAE Centre for Excellence in Basic Sciences, Mumbai)

TL;DR
This paper recounts the historical development of Gigahertz-Peaked-Spectrum (GPS) radio sources, highlighting early research milestones and recent advances in this key area of extragalactic radio astronomy.
Contribution
It provides a first-hand historical account of GPS sources' discovery, evolution, and recent progress, clarifying the origin of the term and its significance.
Findings
Historical milestones in GPS research
Origin of the GPS acronym clarified
Recent developments in GPS sources
Abstract
This note chronicles the early steps and incidences from over four decades ago, that gave a kickstart to research on the now prominent subclass of radio galaxies, called 'Gigahertz-Peaked-Spectrum' (GPS) sources. In this first-hand account, the origin of the acronym 'GPS' in this context is retraced, along with the first crucial steps and the major milestones set in course of evolution of this now vibrant branch of extragalactic radio astronomy. A brief update on the recent developments in this field is also presented.
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Taxonomy
TopicsGeophysics and Gravity Measurements · Astrophysics and Cosmic Phenomena · Astronomical Observations and Instrumentation
