A luminous fast radio burst that probes the Universe at redshift 1

Ryder, S. D.; Bannister, K. W.; Bhandari, S.; Deller, A. T.; Ekers, R. D.; Glowacki, M.; Gordon, A. C.; Gourdji, K.; James, C. W.; Kilpatrick, C. D.; Lu, W.; Marnoch, L.; Moss, V. A.; Prochaska, J. X.; Qiu, H.; Sadler, E. M.; Simha, S.; Sammons, M. W.; Scott, D. R.; Tejos, N.; Shannon, R. M.

doi:10.1126/science.adf2678

Cited by 27 publications

(29 citation statements)

References 98 publications

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“…), which will achieve subarcsecond localizations of FRBs beginning in early 2024 thanks to the addition of outrigger telescopes to the array, will significantly increase the rate of well-localized low-DM events. Above z  0.1, where the typical ULX flux scaling drops below the Chandra sensitivity threshold (see Figure 4), and as FRB experiments increase their horizon beyond the current z ∼ 1 (Ryder et al 2023), it will be possible with next-generation X-ray observatories, such as NewAthena and the Advanced X-ray Imaging Satellite (AXIS), to perform productive searches for ULX-like counterparts.…”

Section: Searching For X-ray Counterpartsmentioning

confidence: 99%

“…Technical upgrades to a number of FRB experiments in recent years have facilitated a small, but growing number of (sub)arcsecond localizations and robust host galaxy identifications for approximately three dozen events (e.g., Bhardwaj et al 2021;Kirsten et al 2022;Gordon et al 2023;Law et al 2023;Ravi et al 2023;Ryder et al 2023;Sharma et al 2023). The first population studies demonstrate that FRB hosts span a wide range of stellar masses and star formation rates (SFRs) and trace the underlying population of field galaxies (Heintz et al 2020;Bhandari et al 2022;Gordon et al 2023).…”

Section: Introductionmentioning

confidence: 99%

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An X-Ray Census of Fast Radio Burst Host Galaxies: Constraints on Active Galactic Nuclei and X-Ray Counterparts

Eftekhari,

Fong,

Gordon

et al. 2023

ApJ

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We present the first X-ray census of fast radio burst (FRB) host galaxies to conduct the deepest search for active galactic nuclei (AGN) and X-ray counterparts to date. Our sample includes seven well-localized FRBs with unambiguous host associations and existing deep Chandra observations, including two events for which we present new observations. We find evidence for AGN in two FRB host galaxies based on the presence of X-ray emission coincident with their centers, including the detection of a luminous (L X ≈ 5 × 1042 erg s−1) X-ray source at the nucleus of FRB 20190608B’s host, for which we infer an SMBH mass of M BH ∼ 108 M ⊙ and an Eddington ratio L bol/L Edd ≈ 0.02, characteristic of geometrically thin disks in Seyfert galaxies. We also report nebular emission-line fluxes for 24 highly secure FRB hosts (including 10 hosts for the first time), and assess their placement on a BPT diagram, finding that FRB hosts trace the underlying galaxy population. We further find that the hosts of repeating FRBs are not confined to the star-forming locus, contrary to previous findings. Finally, we place constraints on associated X-ray counterparts to FRBs in the context of ultraluminous X-ray sources (ULXs), and find that existing X-ray limits for FRBs rule out ULXs brighter than L X ≳ 1040 erg s−1. Leveraging the CHIME/FRB catalog and existing ULX catalogs, we search for spatially coincident ULX–FRB pairs. We identify a total of 28 ULXs spatially coincident with the localization regions for 17 FRBs, but find that the DM-inferred redshifts for the FRBs are inconsistent with the ULX redshifts, disfavoring an association between these specific ULX–FRB pairs.

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Section: Searching For X-ray Counterpartsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An X-Ray Census of Fast Radio Burst Host Galaxies: Constraints on Active Galactic Nuclei and X-Ray Counterparts

Eftekhari,

Fong,

Gordon

et al. 2023

ApJ

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“…The low burst yield per source poses challenges in detecting potential periodicity in burst emissions or confidently ruling out its existence. Moreover, recent evidence suggests the existence of an energetic burst population at high redshifts (Ryder et al 2023), emphasizing the significance of enhancing detection yield to effectively employ them as cosmological probes (Macquart et al 2020). To comprehensively characterize the luminosity distribution of FRBs, it becomes imperative to detect and analyze bursts that lie near or below the detection thresholds of current instruments that may have been missed due to the incompleteness of existing search techniques.…”

Section: Introductionmentioning

confidence: 99%

Detecting Fast Radio Bursts with Spectral Structure Using the Continuous Forward Algorithm

Kumar,

Zackay,

Law

2024

ApJ

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Detecting fast radio bursts (FRBs) with frequency-dependent intensity remains a challenge, as existing search algorithms do not account for the spectral shape, potentially leading to nondetections. We propose a novel detection statistic, which we call the Kalman detector, that improves the sensitivity of FRB signal detection by incorporating spectral shape information. The detection statistic is based on an optimal matched filter, marginalizing over all possible intensity functions, weighted by a random walk probability distribution, considering some decorrelation bandwidth. Our analysis of previously detected FRBs demonstrates that the Kalman score provides a comparable yet independent source of information for bursts with significant spectral structure, and the sensitivity improvement is of the order 0%–200% with a median improvement of 20%. We also applied the Kalman detector to existing data from FRB 20201124A and detected two new repeat bursts that were previously missed. Furthermore, we suggest a practical implementation for real-time surveys by employing a low significance soft-trigger from initial flux integration-based detection algorithms. The Kalman detector has the potential to significantly enhance FRB detection capabilities and enable new insights into the spectral properties of these enigmatic astrophysical phenomena.

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“…If placed at z > 1 or behind another magnitude of extinction, the identification of the host would become prohibitively expensive for even the largest ground-based telescopes. FRB hosts have been found at z ∼ 1 (Ryder et al 2023), while Marnoch et al (2023) presented follow-up of FRB 20210912A, which is still without an identified host despite deep observations with the Very Large Telescope-even deeper optical time is required for these high-redshift FRBs through limited telescope resources. Another scenario is an FRB localized at low Galactic latitude, where dust extinction from the Galactic plane hampers optical follow-up.…”

Section: Introductionmentioning

confidence: 99%

H i, FRB, What’s Your z: The First FRB Host Galaxy Redshift from Radio Observations

Glowacki,

Bera,

Lee-Waddell

et al. 2024

ApJL

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Identification and follow-up observations of the host galaxies of fast radio bursts (FRBs) not only help us understand the environments in which the FRB progenitors reside, but also provide a unique way of probing the cosmological parameters using the dispersion measures (DMs) of FRBs and distances to their origin. A fundamental requirement is an accurate distance measurement to the FRB host galaxy, but for some sources viewed through the Galactic plane, optical/near-infrared spectroscopic redshifts are extremely difficult to obtain due to dust extinction. Here we report the first radio-based spectroscopic redshift measurement for an FRB host galaxy, through detection of its neutral hydrogen (H i) 21 cm emission using MeerKAT observations. We obtain an H i–based redshift of z = 0.0357 ± 0.0001 for the host galaxy of FRB 20230718A, an apparently nonrepeating FRB detected in the Commensal Real-time ASKAP Fast Transients survey and localized at a Galactic latitude of –0.°367. Our observations also reveal that the FRB host galaxy is interacting with a nearby companion, which is evident from the detection of an H i bridge connecting the two galaxies. A subsequent optical spectroscopic observation confirmed an FRB host galaxy redshift of 0.0359 ± 0.0004. This result demonstrates the value of H i to obtain redshifts of FRBs at low Galactic latitudes and redshifts. Such nearby FRBs whose DMs are dominated by the Milky Way can be used to characterize these components and thus better calibrate the remaining cosmological contribution to dispersion for more distant FRBs that provide a strong lever arm to examine the Macquart relation between cosmological DM and redshift.

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A luminous fast radio burst that probes the Universe at redshift 1

Cited by 27 publications

References 98 publications

An X-Ray Census of Fast Radio Burst Host Galaxies: Constraints on Active Galactic Nuclei and X-Ray Counterparts

An X-Ray Census of Fast Radio Burst Host Galaxies: Constraints on Active Galactic Nuclei and X-Ray Counterparts

Detecting Fast Radio Bursts with Spectral Structure Using the Continuous Forward Algorithm

H i, FRB, What’s Your z: The First FRB Host Galaxy Redshift from Radio Observations

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