A5016013613- Pulsars and Gravitational Waves Research
- Gamma-ray bursts and supernovae
- Astrophysical Phenomena and Observations
- Radio Astronomy Observations and Technology
- Astrophysics and Cosmic Phenomena
- Astronomy and Astrophysical Research
- GNSS positioning and interference
- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Astro and Planetary Science
California Institute of Technology
2018-2024
McGill University
2016
We report the detection and interferometric localization of repeating fast radio burst (FRB) source FRB 20220912A during commissioning observations with Deep Synoptic Array (DSA-110). Two bursts were detected from 20220912A, one each on 2022 October 18 25. The best-fit position is (R.A. J2000, decl. J2000) = (23:09:04.9, +48:42:25.4), a 90% confidence error ellipse $\pm2$ arcsec $\pm1$ in right ascension declination respectively. two have disparate polarization properties temporal profiles....
Abstract Fast radio bursts (FRBs) are a powerful and mysterious new class of transients that luminous enough to be detected at cosmological distances. By associating FRBs host galaxies, we can measure intrinsic environmental properties test FRB origin models, in addition using them as precise probes distant cosmic gas. The Deep Synoptic Array (DSA-110) is interferometer built maximize the rate which it simultaneously detect localize FRBs. Here, present first sample galaxies discovered by...
The stellar population environments associated with fast radio burst (FRB) sources provide important insights for developing their progenitor theories. We expand the diversity of known FRB host by reporting two FRBs in massive galaxy clusters discovered Deep Synoptic Array (DSA-110) during its commissioning observations. 20220914A has been localized to a star-forming, late-type at redshift 0.1139 multiple starbursts lookback times less than $\sim$3.5 Gyr Abell 2310 cluster. Although is...
Abstract We report on a full-polarization analysis of the first 25 as yet nonrepeating fast radio bursts (FRBs) detected at 1.4 GHz by 110-antenna Deep Synoptic Array (DSA-110) during commissioning observations. present details data-reduction, calibration, and procedures developed for this novel instrument. Faraday rotation measures (RMs) are searched between ±10 6 rad m −2 20 FRBs, with magnitudes ranging from 4 to 4670 . Fifteen out FRBs consistent 100% polarization, 10 which have high...
The hot gas that constitutes the intracluster medium (ICM) has been studied at X-ray and millimeter/sub-millimeter wavelengths (Sunyaev-Zeldovich effect) for decades. Fast radio bursts (FRBs) offer an additional method of directly measuring ICM surrounding clusters, via observables such as dispersion measure (DM) Faraday rotation (RM). We report discovery two FRB sources detected with Deep Synoptic Array (DSA-110) whose host galaxies belong to massive galaxy clusters. In both cases, FRBs...
Abstract The engines that produce extragalactic fast radio bursts (FRBs), and the mechanism by which emission is generated, remain unknown. Many FRB models predict prompt multiwavelength counterparts, can be used to refine our knowledge of these fundamentals phenomenon. However, several previous targeted searches for counterparts have yielded no detections additionally not reached sufficient sensitivity with respect predictions. In this work, we demonstrate a technique estimate ratio, η ,...
Abstract Faraday rotation measures (RMs) of fast radio bursts (FRBs) offer the prospect directly measuring extragalactic magnetic fields. We present an analysis RMs 10 as yet nonrepeating FRBs detected and localized to host galaxies with robust redshift measurements by 63-antenna prototype Deep Synoptic Array (DSA-110). combine this sample published 15 FRBs, nine which are repeating sources. For each FRB in combined sample, we estimate host-galaxy dispersion measure (DM) contributions RM....
Abstract FRB 121102 is the first fast radio burst to be spatially associated with a persistent source (QRS 121102), nature of which remains unknown. We constrain physical size QRS by measuring its flux-density variability VLA from 12 26 GHz. Any such would likely due Galactic refractive scintillation and require radius ≲10 17 cm at host-galaxy redshift. found lower than theory predictions for small source, leaving open possibility non-AGN models 121102. In addition, we roughly estimated mass...
We report on Nuclear Spectroscopic Telescope Array (NuSTAR) hard X-ray observations of the young rotation-powered radio pulsar PSR B1509$-$58 in supernova remnant MSH 15$-$52. confirm previously reported curvature spectrum, showing that a log parabolic model provides statistically superior fit to spectrum compared with standard power law. The describes NuSTAR data, as well published gamma-ray data obtained COMPTEL and AGILE, all together spanning 3 keV through 500 MeV. Our spectral modelling...
Abstract We present a new Spitzer transit observation of K2–28b, sub-Neptune ( R p = 2.45 ± 0.28 ⊕ ) orbiting relatively bright V mag 16.06, K 10.75) metal-rich M4 dwarf (EPIC 206318379). This star is one only seven with masses less than 0.2 <?CDATA ${M}_{\odot }$?> known to host transiting planets, and the planet appears be slightly smaller analogue GJ 1214b $2.85\pm 0.20\,{R}_{\oplus ). Our observations were taken two years after original K2 discovery data have significantly higher...
We report on a full-polarization analysis of the first 25 as yet non-repeating FRBs detected at 1.4 GHz by 110-antenna Deep Synoptic Array (DSA-110) during commissioning observations. present details data-reduction, calibration, and procedures developed for this novel instrument. Faraday rotation measures (RMs) are searched between $\pm10^6$ rad m$^{-2}$ 20 with magnitudes ranging from $4-4670$ m$^{-2}$. $15/25$ consistent 100% polarization, 10 which have high ($\ge70\%$) linear-polarization...
Faraday rotation measures (RMs) of fast radio bursts (FRBs) offer the prospect directly measuring extragalactic magnetic fields. We present an analysis RMs ten as yet non-repeating FRBs detected and localized to host galaxies by 110-antenna Deep Synoptic Array (DSA-110). combine this sample with published 15 FRBs, nine which are repeating sources. For each FRB in combined sample, we estimate host-galaxy dispersion measure (DM) contributions RM. find compelling evidence that components often...