A Nonrepeating fast radio burst in a dwarf host galaxy

Shivani Bhandari; Alexa C. Gordon; Danica R. Scott; Lachlan Marnoch; Navin Sridhar; Pravir Kumar; Clancy W. James; Hao Qiu; Keith W. Bannister; Adam T. Deller; Tarraneh Eftekhari; Wen-fai Fong; Marcin Glowacki; J. Xavier Prochaska; Stuart D. Ryder; Ryan M. Shannon; Sunil Simha

doi:10.3847/1538-4357/acc178

A Nonrepeating fast radio burst in a dwarf host galaxy

Shivani Bhandari^*, Alexa C. Gordon, Danica R. Scott, Lachlan Marnoch, Navin Sridhar, Pravir Kumar, Clancy W. James, Hao Qiu, Keith W. Bannister, Adam T. Deller, Tarraneh Eftekhari, Wen-fai Fong, Marcin Glowacki, J. Xavier Prochaska, Stuart D. Ryder, Ryan M. Shannon, Sunil Simha

^*Corresponding author for this work

School of Mathematical and Physical Sciences

Research output: Contribution to journal › Article › peer-review

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Abstract

We present the discovery of an as yet nonrepeating fast radio burst (FRB), FRB 20210117A, with the Australian Square Kilometre Array Pathfinder (ASKAP), as a part of the Commensal Real-time ASKAP Fast Transients Survey. The subarcsecond localization of the burst led to the identification of its host galaxy at z = 0.214(1). This redshift is much lower than what would be expected for a source dispersion measure (DM) of 729 pc cm⁻³, given typical contributions from the intergalactic medium and the host galaxy. Optical observations reveal the host to be a dwarf galaxy with little ongoing star formation—very different to the dwarf host galaxies of the known repeating FRBs 20121102A and 20190520B. We find an excess DM contribution from the host and attribute it to the FRB’s local environment. We do not find any radio emission from the FRB site or host galaxy. The low magnetized environment and the lack of a persistent radio source indicate that the FRB source is older than those found in other dwarf host galaxies, establishing the diversity of FRB sources in dwarf galaxy environments. We find our observations to be fully consistent with the “hypernebula” model, where the FRB is powered by an accretion jet from a hyperaccreting black hole. Finally, our high time resolution analysis reveals burst characteristics similar to those seen in repeating FRBs. We encourage follow-up observations of FRB 20210117A to establish any repeating nature.

Original language	English
Article number	67
Pages (from-to)	1-11
Number of pages	11
Journal	Astrophysical Journal
Volume	948
Issue number	1
DOIs	https://doi.org/10.3847/1538-4357/acc178
Publication status	Published - 1 May 2023

Bibliographical note

Copyright © 2023. The Author(s). Published by the American Astronomical Society. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

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10.3847/1538-4357/acc178Licence: CC BY

Publisher version (open access)Final published version, 3.75 MBLicence: CC BY

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Bhandari, S., Gordon, A. C., Scott, D. R., Marnoch, L., Sridhar, N., Kumar, P., James, C. W., Qiu, H., Bannister, K. W., T. Deller, A., Eftekhari, T., Fong, W., Glowacki, M., Prochaska, J. X., Ryder, S. D., Shannon, R. M., & Simha, S. (2023). A Nonrepeating fast radio burst in a dwarf host galaxy. Astrophysical Journal, 948(1), 1-11. [67]. https://doi.org/10.3847/1538-4357/acc178

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title = "A Nonrepeating fast radio burst in a dwarf host galaxy",

abstract = "We present the discovery of an as yet nonrepeating fast radio burst (FRB), FRB 20210117A, with the Australian Square Kilometre Array Pathfinder (ASKAP), as a part of the Commensal Real-time ASKAP Fast Transients Survey. The subarcsecond localization of the burst led to the identification of its host galaxy at z = 0.214(1). This redshift is much lower than what would be expected for a source dispersion measure (DM) of 729 pc cm−3, given typical contributions from the intergalactic medium and the host galaxy. Optical observations reveal the host to be a dwarf galaxy with little ongoing star formation—very different to the dwarf host galaxies of the known repeating FRBs 20121102A and 20190520B. We find an excess DM contribution from the host and attribute it to the FRB{\textquoteright}s local environment. We do not find any radio emission from the FRB site or host galaxy. The low magnetized environment and the lack of a persistent radio source indicate that the FRB source is older than those found in other dwarf host galaxies, establishing the diversity of FRB sources in dwarf galaxy environments. We find our observations to be fully consistent with the “hypernebula” model, where the FRB is powered by an accretion jet from a hyperaccreting black hole. Finally, our high time resolution analysis reveals burst characteristics similar to those seen in repeating FRBs. We encourage follow-up observations of FRB 20210117A to establish any repeating nature.",

author = "Shivani Bhandari and Gordon, {Alexa C.} and Scott, {Danica R.} and Lachlan Marnoch and Navin Sridhar and Pravir Kumar and James, {Clancy W.} and Hao Qiu and Bannister, {Keith W.} and {T. Deller}, Adam and Tarraneh Eftekhari and Wen-fai Fong and Marcin Glowacki and Prochaska, {J. Xavier} and Ryder, {Stuart D.} and Shannon, {Ryan M.} and Sunil Simha",

note = "Copyright {\textcopyright} 2023. The Author(s). Published by the American Astronomical Society. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.",

year = "2023",

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doi = "10.3847/1538-4357/acc178",

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T1 - A Nonrepeating fast radio burst in a dwarf host galaxy

AU - Bhandari, Shivani

AU - Gordon, Alexa C.

AU - Scott, Danica R.

AU - Marnoch, Lachlan

AU - Sridhar, Navin

AU - Kumar, Pravir

AU - James, Clancy W.

AU - Qiu, Hao

AU - Bannister, Keith W.

AU - T. Deller, Adam

AU - Eftekhari, Tarraneh

AU - Fong, Wen-fai

AU - Glowacki, Marcin

AU - Prochaska, J. Xavier

AU - Ryder, Stuart D.

AU - Shannon, Ryan M.

AU - Simha, Sunil

N1 - Copyright © 2023. The Author(s). Published by the American Astronomical Society. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

PY - 2023/5/1

Y1 - 2023/5/1

N2 - We present the discovery of an as yet nonrepeating fast radio burst (FRB), FRB 20210117A, with the Australian Square Kilometre Array Pathfinder (ASKAP), as a part of the Commensal Real-time ASKAP Fast Transients Survey. The subarcsecond localization of the burst led to the identification of its host galaxy at z = 0.214(1). This redshift is much lower than what would be expected for a source dispersion measure (DM) of 729 pc cm−3, given typical contributions from the intergalactic medium and the host galaxy. Optical observations reveal the host to be a dwarf galaxy with little ongoing star formation—very different to the dwarf host galaxies of the known repeating FRBs 20121102A and 20190520B. We find an excess DM contribution from the host and attribute it to the FRB’s local environment. We do not find any radio emission from the FRB site or host galaxy. The low magnetized environment and the lack of a persistent radio source indicate that the FRB source is older than those found in other dwarf host galaxies, establishing the diversity of FRB sources in dwarf galaxy environments. We find our observations to be fully consistent with the “hypernebula” model, where the FRB is powered by an accretion jet from a hyperaccreting black hole. Finally, our high time resolution analysis reveals burst characteristics similar to those seen in repeating FRBs. We encourage follow-up observations of FRB 20210117A to establish any repeating nature.

AB - We present the discovery of an as yet nonrepeating fast radio burst (FRB), FRB 20210117A, with the Australian Square Kilometre Array Pathfinder (ASKAP), as a part of the Commensal Real-time ASKAP Fast Transients Survey. The subarcsecond localization of the burst led to the identification of its host galaxy at z = 0.214(1). This redshift is much lower than what would be expected for a source dispersion measure (DM) of 729 pc cm−3, given typical contributions from the intergalactic medium and the host galaxy. Optical observations reveal the host to be a dwarf galaxy with little ongoing star formation—very different to the dwarf host galaxies of the known repeating FRBs 20121102A and 20190520B. We find an excess DM contribution from the host and attribute it to the FRB’s local environment. We do not find any radio emission from the FRB site or host galaxy. The low magnetized environment and the lack of a persistent radio source indicate that the FRB source is older than those found in other dwarf host galaxies, establishing the diversity of FRB sources in dwarf galaxy environments. We find our observations to be fully consistent with the “hypernebula” model, where the FRB is powered by an accretion jet from a hyperaccreting black hole. Finally, our high time resolution analysis reveals burst characteristics similar to those seen in repeating FRBs. We encourage follow-up observations of FRB 20210117A to establish any repeating nature.

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DO - 10.3847/1538-4357/acc178

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VL - 948

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EP - 11

JO - Astrophysical Journal

JF - Astrophysical Journal

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ER -

A Nonrepeating fast radio burst in a dwarf host galaxy

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