Gamma-Ray Bursts as Distance Indicators by a Statistical Learning Approach
(2024) In Astrophysical Journal Letters 967(2).- Abstract
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... (More)
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.
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- author
- Dainotti, Maria Giovanna ; Narendra, Aditya ; Pollo, Agnieszka ; Petrosian, Vahé ; Bogdan, Malgorzata LU ; Iwasaki, Kazunari ; Prochaska, Jason Xavier ; Rinaldi, Enrico and Zhou, David
- organization
- publishing date
- 2024-06-01
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Astrophysical Journal Letters
- volume
- 967
- issue
- 2
- article number
- L30
- publisher
- IOP Publishing
- external identifiers
-
- scopus:85194061058
- ISSN
- 2041-8205
- DOI
- 10.3847/2041-8213/ad4970
- language
- English
- LU publication?
- yes
- id
- 4c9a4c2b-e772-4654-976a-4e9375055985
- date added to LUP
- 2024-06-05 13:52:55
- date last changed
- 2024-06-05 13:54:07
@article{4c9a4c2b-e772-4654-976a-4e9375055985, abstract = {{<p>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<sup>−1</sup> Gpc<sup>−1</sup> 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.</p>}}, author = {{Dainotti, Maria Giovanna and Narendra, Aditya and Pollo, Agnieszka and Petrosian, Vahé and Bogdan, Malgorzata and Iwasaki, Kazunari and Prochaska, Jason Xavier and Rinaldi, Enrico and Zhou, David}}, issn = {{2041-8205}}, language = {{eng}}, month = {{06}}, number = {{2}}, publisher = {{IOP Publishing}}, series = {{Astrophysical Journal Letters}}, title = {{Gamma-Ray Bursts as Distance Indicators by a Statistical Learning Approach}}, url = {{http://dx.doi.org/10.3847/2041-8213/ad4970}}, doi = {{10.3847/2041-8213/ad4970}}, volume = {{967}}, year = {{2024}}, }