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Gayathri Raman
Has grant
United StatesResearch Interests
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Recent Grants
Grant: Close
Newton-Bhabha Indo-UK grant - Best Poster Award
Open Date: 2019-05-01
Close Date: 2019-07-01
Grant: Close
Timing and spectral studies of Type-1 thermonuclear X-ray bursts using AstroSat
Open Date: 2019-01-01
Close Date: 2022-01-01
Articles (7)
Year:
2026
Year:
2025
We present the results obtained from a comprehensive timing and spectral study of two high mass X-ray binary sources using NuSTAR observations. These two sources, IGR J16320-4751 and IGR J16479-4514 were discovered by INTEGRAL and have been characterizated for the first time in the hard X-ray band (beyond 10 keV) in this work. In these sources, we observe the occurrence of intense X-ray flares, with average luminosities exceeding 1036 erg s−1. Our analysis reveals that these flares can be described consistently in the quasi-spherical accretion regime. The orbital phase of the first flare in NuSTAR observation of IGR J16479-4514 matches with the orbital phases of previous flares (φ = 0.35) in this source detected by other telescopes. We conclude that this flare occurs as a result of the periastron passage of the neutron star, rather than due to the presence of a corotating interaction region (CIR). Furthermore, from the energy-resolved pulse profile analysis of IGR J16320-4751, we find that the pulse fraction is lower in hard X-rays compared to the soft X-rays. We present the hard X-ray spectral parameters of these two sources using several standard spectral model components. We do not detect a cyclotron absorption feature in either target. We provide estimates to the surface magnetic field strength of NS in IGR J16320-4751 using two indirect methods. Lastly, we observe spectral hardening during flaring segments compared to the off-flaring segments which indicates that comptonization is more effective during the flaring segments.
Year:
2023
Year:
2022
Year:
2021
Year:
2021
Year:
2021
Collaborators (99)
Marco Meyer-Conde
Assistant Professor
Tokyo Gakugei University
Barbara Patricelli
Associate Professor
University of Pisa
Massimiliano Razzano
Docenti di ruolo di IIa fascia
University of Pisa
Edward Daw
Reader
University of Sheffield
William Smith
Assistant Professor of Physics
Fisk University
Takahiro Yamamoto
Project assistant professor
The Univeristy of Tokyo
Marc van der Sluys
Utrecht University
Pooyan Goodarzi
University of California, Riverside
Nelson Christensen
Carleton College
Marc Favata
Professor of Physics
Montclair State University
Aaron Jones
Logisticien de Recherche / Staff Scientist
Université catholique de Louvain
Hiroyuki Nakano
Professor
Ryukoku University
Jamie Kennea
Research Professor
Pennsylvania State University
Andrew L Miller
Assistant Professor
Université catholique de Louvain
Steven Penn
Research Professor
Syracuse University
Suprovo Ghosh
University of Southampton
James Clark
California Institute of Technology
Laura Kate Nuttall
Academic, Professor, Professor of Gravitational Wave Astronomy
University of Portsmouth
Soichiro Morisaki
Assistant professor
Institute for Cosmic Ray Research, University of Tokyo
Anna Liu
Perimeter Institute
Amazigh Ouzriat
Institut de Physique des 2 Infinis de Lyon
B. J. J. Slagmolen
Australian National University
Carlos García Núñez
Lecturer Electronics and Nanoscale Engineering
University of Glasgow
Michèle Heurs
Professor
Leibniz University Hannover
Ben Farr
Assistant Professor
University of Oregon
Yanyan Yang
Academic, Senior Lecturer, Senior Lecturer
University of Portsmouth
Philip Charlton
Senior Lecturer
Charles Sturt University
Andrew Lundgren
Academic, Professor, Professor of Astrophysics
University of Portsmouth
Danièle STEER
Professor
Université Paris Diderot
Rahul Kashyap
Assitant Professor
Indian Institute of Technology, Bombay
Innocenzo M. Pinto
Professor of Electromagnetis
University of Naples Federico II
Argyro Sasli
University of Minnesota
Ammar Al-Jodah
University of Western Australia
Myriam ZERRAD
National Technical Representative
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Carl Blair
University of Western Australia
Vassiliki Kalogera
Professor
Northwestern University
ESTER RUIZ MORALES
Profesora Titular de Universidad
Universidad Politécnica de Madrid
Marco Drago
Associate Professor
Sapienza University of Rome
Jian Liu
University of Western Australia
David Blair
University of Western Australia
Andrew Spencer
Lecturer
University of Glasgow
Varun Bhalerao
Associate Professor
Indian Institute of Technology, Bombay
David Keitel
Profesor Titular Laboral
Universitat de les Illes Balears
Giovanni Losurdo
Full professor
Scuola Normale Superiore
Ornella Juliana Piccinni
Ramon y Cajal tenure track
Universitat de les Illes Balears
Gungwon Kang
Professor
Chung-Ang University
Fiona Helen Panther
University of Western Australia
Simone Dichiara
Assistant Research Professor
Pennsylvania State University
Mischa Sallé
Institute of Nuclear Physics
John Veitch
Professor of Physics
University of Glasgow
Rosa Poggiani
Associate Professor
University of Pisa
Terry McRae
Australian National University
Fausto Acernese
Professore Associato
University of Salerno
Anamaria Effler
Senior scientist / Deputy Commissioning Lead
California Institute of Technology
James Kennington
Assistant Professor
United States Naval Academy
Bryan Barr
University of Glasgow
Eric Howell
University in Western Australia
David Coward
University of Western Australia
Amber Stuver
Associate Professor
Villanova University
Andrei Utina
University of Maastricht
Sangeet Paul
University of Oregon
Gideon Koekoek
University of Maastricht
Anna Green
Assistant Professor
University of Maastricht
Joris van Heijningen
Assistant professor
University of Amsterdam
Linqing Wen
University of Western Australia
Alessandro Parisi
Assistant Professor (RTD-A)
University of Perugia
G. Cagnoli
Professor
Université Claude Bernard Lyon 1
Archisman Ghosh
Assistant Professor (ZAP docent tenure track)
Ghent University
Charalampos Markakis
Assistant Professor
Stony Brook University
Annalisa Allocca
Ricercatore a Tempo Determinato - tipo A
Università degli Studi di Napoli Federico II
Jiayi Qin
Australian National University
Jonas Junker
Junior Group Leader
Friedrich Schiller University Jena
Conor Mow-Lowry
University of Amsterdam
Aubrey Laity
Graduate Teaching Assistant
University of Rhode Island
Orest Dorosh
National Centre for Nuclear Research
Chiara Di Fronzo
University of Western Australia
Richard O'Shaughnessy
Rochester Institute of Technology
Weichangfeng Guo
University in Western Australia
Patricia Schmidt
Associate Professor
University of Birmingham
Massimo Carpinelli
Full Professor
University of Milano-Bicocca
Ya Zhang
The Australian National University
Marwa Ben Yaala
University Of Strathclyde
Francesco Pannarale
Associate Professor
Sapienza University of Rome
Lili Mei Granda Argianas
Washington University in St. Louis
Francisco Salces-Carcoba
Assistant Professor in Physics
University of New Mexico
Jennifer Wright
Australian National University
Chayan Chatterjee
Vanderbilt University
Aldo Ejlli
Group Leader
Max Planck Institute for Gravitational Physics
Hamid Satari
University of Western Australia
Maya Fishbach
National Institute for Astrophysics
Colter Richardson
Graduate Teaching Assistant
The University of Tennessee Knoxville
Roberto De Pietri
Associate Professor
Università degli Studi di Pavia
Damon Beveridge
University of Western Australia
Shoichi Oshino
University of Tokyo
Alexandra Mitchell
Stanford University
Amanda Baylor
Teaching Assistant
University of Wisconsin-Milwaukee
Paul Hill
University Of Strathclyde
Varun Bahal
KTH Royal Institute of Technology
Kevin Turbang
University of Antwerp
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