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Gamma-Ray Bursts as...
Gamma-Ray Bursts as Distance Indicators by a Statistical Learning Approach
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- Dainotti, Maria Giovanna (author)
- Space Science Institute,National Astronomical Observatory of Japan,Graduate University for Advanced Studies
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- Narendra, Aditya (author)
- Jagiellonian University
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- Pollo, Agnieszka (author)
- Jagiellonian University
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- Petrosian, Vahé (author)
- Stanford University
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- Bogdan, Malgorzata (author)
- Lund University,Lunds universitet,Statistiska institutionen,Ekonomihögskolan,Department of Statistics,Lund University School of Economics and Management, LUSEM,Wroclaw University
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- Iwasaki, Kazunari (author)
- Graduate University for Advanced Studies,National Astronomical Observatory of Japan
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- Prochaska, Jason Xavier (author)
- University of California, Santa Cruz
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- Rinaldi, Enrico (author)
- RIKEN SPring-8 center
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- Zhou, David (author)
- Arizona State University
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(creator_code:org_t)
- 2024
- 2024
- English.
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In: Astrophysical Journal Letters. - 2041-8205. ; 967:2
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http://dx.doi.org/10... (free)
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Abstract
Subject headings
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- Gamma-ray bursts (GRBs) can be probes of the early Universe, but currently, only 26% of GRBs observed by the Neil Gehrels Swift Observatory have known redshifts (z) due to observational limitations. To address this, we estimated the GRB redshift (distance) via a supervised statistical learning model that uses optical afterglow observed by Swift and ground-based telescopes. The inferred redshifts are strongly correlated (a Pearson coefficient of 0.93) with the observed redshifts, thus proving the reliability of this method. The inferred and observed redshifts allow us to estimate the number of GRBs occurring at a given redshift (GRB rate) to be 8.47-9 yr−1 Gpc−1 for 1.9 < z < 2.3. Since GRBs come from the collapse of massive stars, we compared this rate with the star formation rate, highlighting a discrepancy of a factor of 3 at z < 1.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Publication and Content Type
- art (subject category)
- ref (subject category)
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