EXTRACTING HOST GALAXY DISPERSION MEASURE AND CONSTRAINING COSMOLOGICAL PARAMETERS USING FAST RADIO BURST DATA

ABSTRACT Fast radio bursts (FRBs) remain one of the most enigmatic astrophysical sources. Observations have significantly progressed over the last few years, due to the capabilities of new radio telescopes and the refurbishment of existing ones. Here, we describe the upgrade of the Northern Cross radio telescope, operating in the 400–416 MHz frequency band, with the ultimate goal of turning the array into a dedicated instrument to survey the sky for FRBs. We present test observations of the pulsar B0329+54 to characterize the system performance and forecast detectability. Observations with the system currently in place are still limited by modest sky coverage (∼9.4 deg2) and biased by smearing of high dispersion measure events within each frequency channels. In its final, upgraded configuration, however, the telescope will be able to carry out unbiased FRB surveys over a ∼350 deg2 instantaneous field of view up to z ∼ 5, with a (nearly constant) $\sim 760 \, (\tau /{\rm ms})^{-0.5}$ mJy rms sensitivity.

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Dispersion Measure Variation of Repeating Fast Radio Burst Sources

The Astrophysical Journal ◽

10.3847/1538-4357/aa8721 ◽

2017 ◽

Vol 847 (1) ◽

pp. 22 ◽

Cited By ~ 31

Author(s):

Yuan-Pei Yang ◽

Bing Zhang

Keyword(s):

Radio Burst ◽

Dispersion Measure ◽

Fast Radio Burst

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First Prompt Optical Observations of Nearest Fast Radio Burst new New Astromomical Method

10.21203/rs.3.rs-97780/v1 ◽

2020 ◽

Author(s):

Vladimir Lipunov ◽

V. Kornilov ◽

E. Gorbovskoy ◽

Kirill Zhirkov ◽

Aristarkh Chasovnikov ◽

...

Keyword(s):

Radio Burst ◽

Gamma Ray ◽

The Other ◽

New Method ◽

Optical Observations ◽

Host Galaxy ◽

Radio Range ◽

Fast Transients ◽

Fast Radio Burst ◽

The Universe

Abstract With the discovery of gamma ray bursts1,2, it became clear that our Universe flickers with superfast catastrophic events, sometimes lasting for a thousandths of a second. These ultra-fast transients - the peculiar one-day butterflies of the Universe - shine so brightly that they are noticed even on the other end of the Universe and, moreover, by very small telescopes. But in the radio range, the sky remained silent until the beginning of the 21st century. Only in 2007, radio astronomers analyzing archival observations of the Parkes Radio Telescope first encountered fast transients 3,4 . About a hundred such sources have already been discovered. We report the first optical observation of the closest radio burster FRB 180916.J0158+655-8 synchronously with a radio burst. In total, we obtained about 155,093 images at MASTER Global Robotic Net9*. In the course of our observations, we found a new method for detecting objects deep below the noise level. In addition, using the new method, we found the excess of photons in the FRB direction at a level of 23 m associated with the emission of the host galaxy.

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Fast Radio Transients: From Pulsars to Fast Radio Bursts

Proceedings of the International Astronomical Union ◽

10.1017/s1743921318002156 ◽

2017 ◽

Vol 14 (S339) ◽

pp. 27-32

Author(s):

B. W. Stappers ◽

M. Caleb ◽

L. N. Driessen

Keyword(s):

Real Time ◽

Time Scales ◽

Radio Burst ◽

Host Galaxy ◽

Radio Bursts ◽

Recent Developments ◽

New Instrumentation ◽

Fast Radio Burst ◽

Radio Transients ◽

Archived Data

AbstractThe radio sky is full of transients, their time-scales ranging from nanoseconds to decades. Recent developments in technology sensitivity and computing capabilities have opened up the short end of that range, and are revealing a plethora of new phenomenologies. Studies of radio transients were previously restricted to analyses of archived data, but are now including real-time analyses. We focus here on Fast Radio Bursts, discuss and compare the properties of the population, and describe what is to date the only known repeating Fast Radio Burst and its host galaxy. We also review what will be possible with the new instrumentation coming online.

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Joint inference on the redshift distribution of fast radio burst and on the intergalactic baryon content

Monthly Notices of the Royal Astronomical Society ◽

10.1093/mnras/staa3963 ◽

2020 ◽

Author(s):

S Hackstein ◽

M Brüggen ◽

F Vazza

Keyword(s):

Radio Burst ◽

Intergalactic Medium ◽

Local Environment ◽

Dispersion Measure ◽

Selection Effects ◽

Radio Bursts ◽

Host Galaxies ◽

Redshift Distribution ◽

Joint Inference ◽

Fast Radio Burst

Abstract Context: Fast radio bursts are transient radio pulses of extragalactic origin. Their dispersion measure is indicative of the baryon content in the ionized intergalactic medium between the source and the observer. However, inference using unlocalized fast radio bursts is degenerate to the distribution of redshifts of host galaxies. Method: We perform a joint inference of the intergalactic baryon content and the fast radio burst redshift distribution with the use of Bayesian statistics by comparing the likelihood of different models to reproduce the observed statistics in order to infer the most likely models. In addition to two models of the intergalactic medium, we consider contributions from the local environment of the source, assumed to be a magnetar, as well as a representative ensemble of host and intervening galaxies. Results: Assuming that the missing baryons reside in the ionized intergalactic medium, our results suggest that the redshift distribution of observed fast radio bursts peaks at z ≲ 0.6. However, conclusions from different instruments regarding the intergalactic baryon content diverge and thus require additional changes to the observed distribution of host redshifts, beyond those caused by telescope selection effects.

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