Cherie Day

Followers

Following

Public Views

Mayra Mendo Li

Glen Torr

The University of Sydney

Roma Tre University, Rome, Italy

Johnson Urama

Andrea Cornwall

King's College London

Interests

Uploads

Papers by Cherie Day

Detection of a Glitch in PSR J0908-4913 by UTMOST

Research Notes of the AAS

Download

First measurement of interplanetary scintillation with the ASKAP radio telescope: Implications for space weather

Advances in Space Research

FRB200607 found by UTMOST

The astronomer's telegram, Jun 1, 2020

Resolving the Host Galaxies of Fast Radio Bursts

HST Proposal, Feb 1, 2020

Data accompanying FRB180924 paper: A single fast radio burst localized to a massive galaxy at cosmological distance

This collection contains data accompanying the paper "A single fast radio burst localized to... more This collection contains data accompanying the paper "A single fast radio burst localized to a massive galaxy at cosmological distance" by Bannister et al (2019) - in Science (manuscript number aaw5903). It contains the following directories. Please consult the README.txt in the directory directory to find out more details on file names/conventions, data formats etc. FRB180924/ - Data used to find and localise FRB180924 visibilities/ - DIFX correlated visibilities used to calibrate and localize the FRB - i.e. the 7 datasets described in the supplementary filterbanks/ - filterbanks formed from the incoherent sum of antennas, containing the data in which FRB180924 was originally found images/ - Images of FRB180924 and in-field sources made from the above visibilities radio/ATCA - Visibilities and images taken with ATCA. radio/ATCA/Astrometry - ATCA Images of in-field sources used verify the FRB180924 astrometry radio/ATCA/4cm and images of the FRB180924 field obtained at 4cm...

FRB 181112 ATCA observations

This collection contains observations using the Australia Telescope Compact Array (ATCA) of the f... more

Characterizing the Fast Radio Burst Host Galaxy Population and its Connection to Transients in the Local and Extragalactic Universe

The Astronomical Journal, 2022

We present the localization and host galaxies of one repeating and two apparently nonrepeating fa... more We present the localization and host galaxies of one repeating and two apparently nonrepeating fast radio bursts (FRBs). FRB 20180301A was detected and localized with the Karl G. Jansky Very Large Array to a star-forming galaxy at z = 0.3304. FRB20191228A and FRB20200906A were detected and localized by the Australian Square Kilometre Array Pathfinder to host galaxies at z = 0.2430 and z = 0.3688, respectively. We combine these with 13 other well-localized FRBs in the literature, and analyze the host galaxy properties. We find no significant differences in the host properties of repeating and apparently nonrepeating FRBs. FRB hosts are moderately star forming, with masses slightly offset from the star-forming main sequence. Star formation and low-ionization nuclear emission-line region emission are major sources of ionization in FRB host galaxies, with the former dominant in repeating FRB hosts. FRB hosts do not track stellar mass and star formation as seen in field galaxies (more th...

Download

Dissecting the Local Environment of FRB 190608 in the Spiral Arm of its Host Galaxy

The Astrophysical Journal, 2021

We present a high-resolution analysis of the host galaxy of fast radio burst (FRB) 190608, an SB(... more We present a high-resolution analysis of the host galaxy of fast radio burst (FRB) 190608, an SB(r)c galaxy at z = 0.11778 (hereafter HG 190608), to dissect its local environment and its contributions to the FRB properties. Our Hubble Space Telescope Wide Field Camera 3 ultraviolet and visible light image reveals that the subarcsecond localization of FRB 190608 is coincident with a knot of star formation (ΣSFR = 1.5 × 10−2 M ⊙ yr−1 kpc−2) in the northwest spiral arm of HG 190608. Using Hβ emission present in our Keck Cosmic Web Imager integral field spectrum of the galaxy with a surface brightness of μ H β = ( 3.36 ± 0.21 ) × 10 − 17 erg s − 1 cm − 2 arcsec − 2 , we infer an extinction-corrected Hα surface brightness and compute a dispersion measure (DM) from the interstellar medium of HG 190608 of DMHost,ISM = 94 ± 38 pc cm−3. The galaxy rotates with a circular velocity v circ = 141 ± 8 km s−1 at an inclination i gas = 37° ± 3°, giving a dynamical mass M halo dyn ≈ 10 11.96 ± 0.08 ...

Download

Antenna systems for 21 cm cosmology

2017 International Conference on Electromagnetics in Advanced Applications (ICEAA), 2017

Measurements of the fine scale spectral distortion in the radio background spectrum below 200 MHz... more Measurements of the fine scale spectral distortion in the radio background spectrum below 200 MHz due to redshifted 21 cm radiation of the cosmological neutral hydrogen (referred to as red-shifted 21 cm signal hereafter) has achieved extraordinary importance in present day cosmology. Detection of this spectral distortion at long wavelength can provide the first radio constraints on the astrophysics that directed the thermal history of the Universe. Amplitude of these spectral distortions are, however, at least five orders of magnitude smaller than the mean brightness of the radio background at these wavelengths. This poses the highest measurement challenges at long wavelength radio astronomy and provides the motivation for innovating unique antenna and radio telescope systems. We present a qualitative discussion on the antenna system requirements for detecting the redshifted 21 cm spectral distortions.

Detection of a Fast Radio Burst at the Molonglo Radio Telescope

ASKAP detection of FRB 190711

Detection of low-frequency radio emission from the magnetar XTE J1810-197

Radio background measurements at long wavelengths

2017 XXXIInd General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS), 2017

The measurement of the radio background at long wavelengths has received a great deal of attentio... more The measurement of the radio background at long wavelengths has received a great deal of attention in observational cosmology over past decade. The Cosmic Microwave Background (CMB) has imprinted on it the history of the cosmological evolution of the primordial neutral hydrogen. The interaction of the CMB and the neutral hydrogen resulted in 21 cm spin flip transitions that has manifested itself in the form of faint spectral signature and are now redshifted to long radio wavelengths. A successful detection of these signatures requires extremely wideband measurements with a 1:10⁁5 accuracy that could be accomplished with smart system engineering and accurate theoretical description of the system that is connected to its electrical performance. We herein present the measurement technique and the result of the radio background measurements by a single element experiment “Shaped Antenna measurements of the background RAdio Spectrum” (SARAS). We also present the design and development of...

Download

Developing an Interferometer to Measure the Global 21cm Monopole

Detection of FRB190322 at the Molonglo Radio Telescope

The astronomer's telegram, 2019

FRB191223 found at UTMOST

The astronomer's telegram, 2019

FRB190711 found at UTMOST

The astronomer's telegram, 2019

Spectral, Temporal, and Polarimetric Properties of ASKAP-localized Fast Radio Bursts

Cherie K. Day*(1,2), Adam T. Deller (1), Ryan M. Shannon(1), and Hao Qiu(2,3) (1) Centre for Astr... more Cherie K. Day*(1,2), Adam T. Deller (1), Ryan M. Shannon(1), and Hao Qiu(2,3) (1) Centre for Astrophysics and Supercomputing, Swinburne University of Technology, Hawthorn VIC 3122, Australia, *e-mail: [email protected]; [email protected]; [email protected] (2) CSIRO Astronomy and Space Science, PO Box 76, Epping, NSW 1710, Australia (3) Sydney Institute for Astronomy, School of Physics, University of Sydney, NSW 2006, Australia, email: [email protected]

Download

Disentangling the Cosmic Web toward FRB 190608

The Astrophysical Journal, 2020

Fast radio burst (FRB) 190608 was detected by the Australian Square Kilometre Array Pathfinder (A... more Fast radio burst (FRB) 190608 was detected by the Australian Square Kilometre Array Pathfinder (ASKAP) and localized to a spiral galaxy at = z 0.11778 host Unified Astronomy Thesaurus concepts: Galaxy dark matter halos (1880); Quasar absorption line spectroscopy (1317); Galaxy evolution (594); Intergalactic medium (813); Radio transient sources (2008)

Download

Chronicling the Host Galaxy Properties of the Remarkable Repeating FRB 20201124A

The Astrophysical Journal Letters, 2021

We present the Australian Square Kilometre Array Pathfinder (ASKAP) localization and follow-up ob... more We present the Australian Square Kilometre Array Pathfinder (ASKAP) localization and follow-up observations of the host galaxy of the repeating fast radio burst (FRB) source, FRB 20201124A, the fifth such extragalactic repeating FRB with an identified host. From spectroscopic observations using the 6.5-m MMT Observatory, we derive a redshift of z = 0.0979 ± 0.0001, a star formation rate inferred from Hα emission of SFR(Hα) ≈ 2.1 M yr −1 , and a gas-phase metallicity of 12+log(O/H)≈ 9.0. By jointly modeling the 12-filter optical-mid-infrared (MIR) photometry and spectroscopy of the host, we infer a median stellar mass of ≈ 2 × 10 10 M , internal dust extinction of A V ≈ 1 − 1.5 mag, and a mass-weighted stellar population age of ≈ 5 − 6 Gyr. Connecting these data to the radio and Xray observations, we cannot reconcile the broad-band behavior with strong AGN activity and instead attribute the dominant source of persistent radio emission to star formation, likely originating from the circumnuclear region of the host. The modeling also indicates a hot dust component contributing to the MIR luminosity at a level of ≈ 10 − 30%. We model the host galaxy's star formation and mass assembly histories, finding that the host assembled > 90% of its mass by 1 Gyr ago and exhibited a fairly constant SFR for most of its existence, with no clear evidence of past star-burst activity.

Download

Detection of a Glitch in PSR J0908-4913 by UTMOST

Research Notes of the AAS

Download

First measurement of interplanetary scintillation with the ASKAP radio telescope: Implications for space weather

Advances in Space Research

FRB200607 found by UTMOST

The astronomer's telegram, Jun 1, 2020

Resolving the Host Galaxies of Fast Radio Bursts

HST Proposal, Feb 1, 2020

Data accompanying FRB180924 paper: A single fast radio burst localized to a massive galaxy at cosmological distance