Do All Fast Radio Bursts Repeat? Constraints from CHIME/FRB Far Side-Lobe FRBs
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arXiv
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| Natura: | Preprint |
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2023
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| author | Lin, Hsiu-Hsien Scholz, Paul Ng, Cherry Pen, Ue-Li Bhardwaj, Mohit Chawla, Pragya Curtin, Alice P. Li, Dongzi Newburgh, Laura Reda, Alex Sand, Ketan R. Tendulkar, Shriharsh P. Andersen, Bridget Bandura, Kevin Brar, Charanjot Cassanelli, Tomas Cook, Amanda M. Dobbs, Matt Dong, Fengqiu Adam Eadie, Gwendolyn Fonseca, Emmanuel Gaensler, Bryan M. Giri, Utkarsh Herrera-Martin, Antonio Hill, Alex S. Kaczmarek, Jane Kania, Joseph Kaspi, Victoria Khairy, Kholoud Lanman, Adam E. Leung, Calvin Masui, Kiyoshi W. Mena-Parra, Juan Meyers, Bradley W. Michilli, Daniele Milutinovic, Nikola Ordog, Anna Pearlman, Aaron B. Pleunis, Ziggy Rafiei-Ravandi, Masoud Rahman, Mubdi Ransom, Scott Sanghavi, Pranav Shin, Kaitlyn Smith, Kendrick Stairs, Ingrid Stenning, David C. Vanderlinde, Keith Wulf, Dallas |
| author_facet | Lin, Hsiu-Hsien Scholz, Paul Ng, Cherry Pen, Ue-Li Bhardwaj, Mohit Chawla, Pragya Curtin, Alice P. Li, Dongzi Newburgh, Laura Reda, Alex Sand, Ketan R. Tendulkar, Shriharsh P. Andersen, Bridget Bandura, Kevin Brar, Charanjot Cassanelli, Tomas Cook, Amanda M. Dobbs, Matt Dong, Fengqiu Adam Eadie, Gwendolyn Fonseca, Emmanuel Gaensler, Bryan M. Giri, Utkarsh Herrera-Martin, Antonio Hill, Alex S. Kaczmarek, Jane Kania, Joseph Kaspi, Victoria Khairy, Kholoud Lanman, Adam E. Leung, Calvin Masui, Kiyoshi W. Mena-Parra, Juan Meyers, Bradley W. Michilli, Daniele Milutinovic, Nikola Ordog, Anna Pearlman, Aaron B. Pleunis, Ziggy Rafiei-Ravandi, Masoud Rahman, Mubdi Ransom, Scott Sanghavi, Pranav Shin, Kaitlyn Smith, Kendrick Stairs, Ingrid Stenning, David C. Vanderlinde, Keith Wulf, Dallas |
| contents | We report ten fast radio bursts (FRBs) detected in the far side-lobe region (i.e., $\geq 5^\circ$ off-meridian) of the Canadian Hydrogen Intensity Mapping Experiment (CHIME) from 2018 August 28 to 2021 August 31. We localize the bursts by fitting their spectra with a model of the CHIME/FRB synthesized beam response. We find that the far side-lobe events have on average ~500 times greater fluxes than events detected in CHIME's main lobe. We show that the side-lobe sample is therefore statistically ~20 times closer than the main-lobe sample. We find promising host galaxy candidates (P$_{\rm cc}$ < 1%) for two of the FRBs, 20190112B and 20210310B, at distances of 38 and 16 Mpc, respectively. CHIME/FRB did not observe repetition of similar brightness from the uniform sample of 10 side-lobe FRBs in a total exposure time of 35580 hours. Under the assumption of Poisson-distributed bursts, we infer that the mean repetition interval above the detection threshold of the far side-lobe events is longer than 11880 hours, which is at least 2380 times larger than the interval from known CHIME/FRB detected repeating sources, with some caveats, notably that very narrow-band events could have been missed. Our results from these far side-lobe events suggest one of two scenarios: either (1) all FRBs repeat and the repetition intervals span a wide range, with high-rate repeaters being a rare subpopulation, or (2) non-repeating FRBs are a distinct population different from known repeaters. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2307_05261 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Do All Fast Radio Bursts Repeat? Constraints from CHIME/FRB Far Side-Lobe FRBs Lin, Hsiu-Hsien Scholz, Paul Ng, Cherry Pen, Ue-Li Bhardwaj, Mohit Chawla, Pragya Curtin, Alice P. Li, Dongzi Newburgh, Laura Reda, Alex Sand, Ketan R. Tendulkar, Shriharsh P. Andersen, Bridget Bandura, Kevin Brar, Charanjot Cassanelli, Tomas Cook, Amanda M. Dobbs, Matt Dong, Fengqiu Adam Eadie, Gwendolyn Fonseca, Emmanuel Gaensler, Bryan M. Giri, Utkarsh Herrera-Martin, Antonio Hill, Alex S. Kaczmarek, Jane Kania, Joseph Kaspi, Victoria Khairy, Kholoud Lanman, Adam E. Leung, Calvin Masui, Kiyoshi W. Mena-Parra, Juan Meyers, Bradley W. Michilli, Daniele Milutinovic, Nikola Ordog, Anna Pearlman, Aaron B. Pleunis, Ziggy Rafiei-Ravandi, Masoud Rahman, Mubdi Ransom, Scott Sanghavi, Pranav Shin, Kaitlyn Smith, Kendrick Stairs, Ingrid Stenning, David C. Vanderlinde, Keith Wulf, Dallas High Energy Astrophysical Phenomena We report ten fast radio bursts (FRBs) detected in the far side-lobe region (i.e., $\geq 5^\circ$ off-meridian) of the Canadian Hydrogen Intensity Mapping Experiment (CHIME) from 2018 August 28 to 2021 August 31. We localize the bursts by fitting their spectra with a model of the CHIME/FRB synthesized beam response. We find that the far side-lobe events have on average ~500 times greater fluxes than events detected in CHIME's main lobe. We show that the side-lobe sample is therefore statistically ~20 times closer than the main-lobe sample. We find promising host galaxy candidates (P$_{\rm cc}$ < 1%) for two of the FRBs, 20190112B and 20210310B, at distances of 38 and 16 Mpc, respectively. CHIME/FRB did not observe repetition of similar brightness from the uniform sample of 10 side-lobe FRBs in a total exposure time of 35580 hours. Under the assumption of Poisson-distributed bursts, we infer that the mean repetition interval above the detection threshold of the far side-lobe events is longer than 11880 hours, which is at least 2380 times larger than the interval from known CHIME/FRB detected repeating sources, with some caveats, notably that very narrow-band events could have been missed. Our results from these far side-lobe events suggest one of two scenarios: either (1) all FRBs repeat and the repetition intervals span a wide range, with high-rate repeaters being a rare subpopulation, or (2) non-repeating FRBs are a distinct population different from known repeaters. |
| title | Do All Fast Radio Bursts Repeat? Constraints from CHIME/FRB Far Side-Lobe FRBs |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2307.05261 |