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Exploring a direct observational method to measure high-redshift cloud collapse timescales and GRB progenitor lifetimes

Published online by Cambridge University Press:  29 August 2024

Jeff Cooke Open the ORCID record for Jeff Cooke [Opens in a new window] ,
Nandita Khetan ,
Sandra Savaglio ,
Jielai Zhang  and
Mark Suhr
Jeff Cooke*
Affiliation:
Centre for Astrophysics and Supercomputing, Swinburne University of Technology, Hawthorn, Victoria 3122, Australia ARC of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D) ARC Centre of Excellence for Gravitational Wave Discovery (OzGrav)
Nandita Khetan
Affiliation:
DARK Cosmology Centre, Niels Bohr Institute, University of Copenhagen, Jagtvej 128, 2200 Copenhagen, Denmark
Sandra Savaglio
Affiliation:
Department of Physics, University of Calabria, I-87036 Arcavacata di Rende, Italy
Jielai Zhang
Affiliation:
Centre for Astrophysics and Supercomputing, Swinburne University of Technology, Hawthorn, Victoria 3122, Australia ARC Centre of Excellence for Gravitational Wave Discovery (OzGrav)
Mark Suhr
Affiliation:
Centre for Astrophysics and Supercomputing, Swinburne University of Technology, Hawthorn, Victoria 3122, Australia ARC of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D)
*
email: jcooke@astro.swin.edu.au
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Abstract

Long gamma-ray bursts (LGRBs) and superluminous supernovae (SLSNe) are expected to result from massive star deaths. However to date, there has been no direct observational measurement of their cloud collapse timescales nor progenitor lifetimes to help constrain their mass. Our analyses of z 2 LGRB afterglow spectra and Hubble Space Telescope images find a higher fraction of host galaxies that are interacting, have a close companion, and/or may have experienced a recent galaxy ‘fly by’ as compared to the general z 2 galaxy population. A smaller set of z 2 SLSNe suggests a similar result. Under the hypothesis that galaxy interactions induce cloud collapse and star formation near their closest approach, we explore measurements of the host and companion galaxy velocities and separations at the time of the LRGB/SLSN event as a direct physical means to measure the timescale of cloud collapse plus progenitor star lifetime.

Keywords

gamma rays: burstsgalaxies: high-redshiftgalaxies: interactionssupernovae: generalstars: evolutionstars: formation
Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 18 , Symposium S361: Massive Stars Near and Far , May 2022 , pp. 584 - 589
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Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of International Astronomical Union

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