The various possibilities for the origin ("progenitors") of gamma-ray bursts (GRBs) manifest in differing observable properties. Through deep spectroscopic and high-resolution imaging observations of some GRB hosts, I demonstrate that well-localized long-duration GRBs are connected with otherwise normal star-forming galaxies at moderate redshifts of order unity. Using high-mass binary stellar population synthesis models, I quantify the expected spatial extent around galaxies of coalescing neutron stars, one of the leading contenders for GRB progenitors. I then test this scenario by examining the offset distribution of GRBs about their apparent hosts making extensive use of ground-based optical data from Keck and Palomar and space-based imaging from the Hubble Space Telescope. The offset distribution appears to be inconsistent with the coalescing neutron star binary hypothesis (and, similarly, black-hole--neutron star coalescences); instead, the distribution is statistically consistent with a population of progenitors that closely traces the ultra-violet light of galaxies. This is naturally explained by bursts which originate from the collapse of massive stars ``collapsars''). This claim is further supported by the unambiguous detections of intermediate-time (approximately three weeks after the bursts) emission ``bumps'' which appear substantially more red than the afterglows themselves. I claim that these bumps could originate from supernovae that occur at approximately the same time as the associated GRB; if true, GRB 980326 and GRB 011121 provide strong observational evidence connecting cosmological GRBs to high-redshift supernovae and implicate massive stars as the progenitors of at least some long-duration GRBs.
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First Sentence:
Gamma-ray bursts, otherwise extinguished by the Earth's atmosphere, were discovered serendipitously (Klebesadel et al. 1973; Strong et al. 1974) by space-based US satellites designed to insure compliance with the Limited Nuclear Test Ban Treaty (signed July 25, 1963) by searching for the -ray emission that accompanies nuclear weapons testing. Read the first page Key Phrases - Statistically Improbable Phrases (SIPs): (learn more)
presumed host galaxy, observed offset distribution, progenitor scenarios, afterglow phenomenon, supernova component, underlying supernova, coalescing neutron star binaries, bump detection, kick distribution, remnant binaries, asymmetric kicks, afterglow observations, merging remnants, afterglow emission, astrometric mapping, comparable redshifts, progenitor models, optical afterglow, radio afterglow, optical transient, merger hypothesis, afterglow era, early afterglow, radio transient, burst sites Key Phrases - Capitalized Phrases (CAPs): (learn more)
Portegies Zwart, East Arm, Palomar Observatory, Hubble Space Telescope, California Institute of Technology, Monte Carlo, Keck Observatory, Mauna Kea, University of California, Bressler Foundation, Custom Scientific, National Radio Astronomy Observatory, Jacobs Camera, Keck R-band, Large Magellanic Cloud, Milky Way, The Astrophysical Journal Letters, Bloom Nov, Omega Optical Bessel New!
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Front Cover | Table of Contents | First Pages | Surprise Me!
Gamma-ray bursts, otherwise extinguished by the Earth's atmosphere, were discovered serendipitously (Klebesadel et al. 1973; Strong et al. 1974) by space-based US satellites designed to insure compliance with the Limited Nuclear Test Ban Treaty (signed July 25, 1963) by searching for the -ray emission that accompanies nuclear weapons testing. Read the first page Key Phrases - Statistically Improbable Phrases (SIPs): (learn more)
presumed host galaxy, observed offset distribution, progenitor scenarios, afterglow phenomenon, supernova component, underlying supernova, coalescing neutron star binaries, bump detection, kick distribution, remnant binaries, asymmetric kicks, afterglow observations, merging remnants, afterglow emission, astrometric mapping, comparable redshifts, progenitor models, optical afterglow, radio afterglow, optical transient, merger hypothesis, afterglow era, early afterglow, radio transient, burst sites Key Phrases - Capitalized Phrases (CAPs): (learn more)
Portegies Zwart, East Arm, Palomar Observatory, Hubble Space Telescope, California Institute of Technology, Monte Carlo, Keck Observatory, Mauna Kea, University of California, Bressler Foundation, Custom Scientific, National Radio Astronomy Observatory, Jacobs Camera, Keck R-band, Large Magellanic Cloud, Milky Way, The Astrophysical Journal Letters, Bloom Nov, Omega Optical Bessel New!
Books on Related Topics | Concordance | Text Stats Browse Sample Pages:
Front Cover | Table of Contents | First Pages | Surprise Me!
Citations (learn more)
This book cites 7
books:
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- X-Ray and Gamma-Ray Instrumentation for Astronomy (Proceedings of Spie) by Kathryn A. Flanagan in Back Matter (1), Back Matter (2), and Back Matter (3)
- Supernovae and Gamma-Ray Bursts: The Greatest Explosions Since the Big Bang (Space Telescope Science Institute Symposium Series) by Mario Livio in Back Matter (1), and Back Matter (2)
- Supernovae and Gamma-Ray Bursters (Lecture Notes in Physics) by Kurt Weiler in Back Matter
- Gamma-Ray Bursts: 5th Huntsville Symposium (AIP Conference Proceedings / Astronomy and Astrophysics) by R. Marc Kippen in Back Matter
- Selected Papers on Noise and Stochastic Processes by Nelson Wax in Back Matter
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