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MIT-IUCAA workshop on X-ray Studies of Transient Astronomical Sources
Introduction to the participants
Md Shah Alam
Research Scholar
Centre For Theoretical Physics
Jamia Millia Islamia
New Delhi India
Supervisor:-Prof. Sanjay Jhingan, CTP, JMI, New Delhi 110025
Co-supervisor:-Prof. Gulabchand Dewangan, IUCAA, Pune India
Current Work:-
IGR J17497-2821(low and hard state):-Spectral analysis(XMM-Newton), timing
analysis(XMM-Newton and RXTE). Energy dependent studies of PDS
features(characteristic frequency, total integrated rms)
Collaboration with Prof. Gulab Chand Dewangan, Aditya Sow Mondal and
Dipanjan Mukherjee.
LMC X-1(high and soft state):-Spectral and timing analysis of the observations
taken from XMM-Newton and Suzaku. Correlation of broad iron line with the
presence of low frequency QPO is being studied.
Collaboration with Prof. Gulab Chand Dewangan, Prof. Tomaso Belloni and
Prof. Sanjay Jhingan
Future plan
Study of timing and spectral characteristics of x-ray emission from black hole x-ray binaries systems and to probe General Relativity in the strong field region very close to a black hole.
For this I will use the data of XMM-Newton, Suzaku and RXTE.
Aru BeriIndian Institute of Technology, RoparThesis Supervisor - Prof . Biswajit Paul
● My current work is related to the study of behavior of X-ray Pulsars during torque reversals . We have studied in detail the pulse profiles of X-ray Pulsar 4U 1626-67 during its eras of accretion torque and have established clear correlation between torque reversals and its pulse profiles. ( Submitted MNRAS)
● We have also done the Pulse Phase Resolved Spectroscopy of 4U 1626-67 to study the flux variability of low energy emission lines seen in its spectrum. ( In Preparation)
● We are trying to probe new ways to constrain neutron star mass and radius relation (EOS) using thermonuclear burst sources.
● We aim to determine the orbital parameters of HMXB source H 1417-624 (with Dr. Harsha Raichur).
● We aim to study a Black Hole Binary source GX339-4 more carefully. ( Work under guidance of Prof. Michael Nowak, Prof. Tomasso Belloni, Prof. Mendez Mariano)
Future Plans
● We plan to study both timing and spectral properties of many more sources in order to investigate the spin evolution, accretion and angular momentum transfer mechanisms.
● We aim to determine the correct and precise orbital parameters of more HMXB sources in future, in order to understand their geometrical structures.
Varun Bhalerao (Vaidya-‐Raichaudhury Fellow, IUCAA)
X-‐rays
• Astrosat CZTI ground calibraBon lead
• NuSTAR » Binaries » Magnetars » ToO group
Transie
nts
• iPTF • OpBcal follow-‐up of transients • SALT program for “young explosions”
January 2014 7 Astrosat + Transient Science Interests | Varun Bhalerao (CZTI Team / IUCAA)
January 2014 Astrosat + Transient Science Interests | Varun Bhalerao (CZTI Team / IUCAA) 8
NS X-‐ray binaries: Timing Bursts
ElectromagneBc follow-‐up of GravitaBonal wave
sources
Young explosions Supernovae (nearby) Novae
Characterize unknown / new / exoBc transients
Non-‐transient interests: NS masses, magneBc fields, orbits, companions, evoluBon…
Manojendu Choudhury Affiliation: Um-DAE Centre For Excellence In Basic Sciences
Current work: Transient black hole systems. Looking for geometrical and physical structure of the accretion disc giving rise to QPOs. Pulsars. Looking for pulsation evolution of pulsars of various kinds. Looking for similarities in the various types of pulsars (Be binaries, HMXRBs, etc.). Studying the quasi-periodic emissions from pulsars. Radio counterpart of unidentified Fermi sources. Radio observation of possible counterparts of unidentified Fermi discovered sources also visible in the TeV regime.
Short term future (coming 1-2 years):- 1. Investigation of geometrical structure of accretion discs during the various classes of quasi-periodic emissions in all types of X-ray binaries. Explore the possibility of the various regions of the quasi-periodicity in the system. This would involve correlated study of the spectral features. 2. Assimilation of data on pulsar evolution, both the timing and spectral features. Long term future (1-5 years):- 1. Simulation of accretion and related phenomena and obtaining of observational features from the theoretical study of the various types of accretion processes. 2. Multi-wavelength study of Blazar sources in the gamma-ray and radio regime.
BROJA G. DUTTA Y. S. Palpara College, Vidyasagar University, Purba-Medinipur, W.B, 721458
I am currently working on Low mass X-ray binaries. Basically, I am studying Timing and spectral properties (studying the X-ray variability as well as X-ray spectroscopy of the source) of the black holes in our own galaxy using RXTE data.
I worked on the hydrodynamics of accretion flow around black holes and studied the accretion disk model to explain the observed spectral and temporal evolution.
MIT-IUCAA Workshop on X-ray Studies of Transient Astronomical Sources 13-24 January 2014, IUCAA, Pune, India
DIRECTORY
Workshop Participants
Md Shah ALAM
Aru BERI
Varun BHALERAO
Manojendu CHOUDHURY
Brojal Gopal DUTTA
Mubashir HAMID
Nazma ISLAM
Nirmal IYER
Gaurava Kumar JAISAWAL
Future Interest and Plan:
I want to study the accretion flow model to interpret the common accretion behavior of the Galactic black hole sources such as Phase/Time Lag variability and variability in Power Density Spectrum during outbursts.
This can be achieved by analyzing the observational data (archival) from various X-ray missions (RXTE, XMM, Suzaku, Swift etc.). This study includes the study of PDS, Phase Lag spectra of photons in different energy bands, Coherence, time variability of observed flux, evolution of accretion parameters and study of spectral parameters etc.
Mubashir Hamid AffiliaBon: University of Kashmir
Presently working on: The energy dependent Bme/phase lags of GRS
1905+115 in the ‘heart-‐beat’ state We try to develop a model and find its cross-‐spectrum,
which would explain the VariaBon of Bme lag with energy
for The fundamental and first harmonic.
We combine various models for a set of varying
parameters like Rin, photon index, accre0on rate etc
With Transients I would like to
• Understand their spectral evoluBon, their excursions in various spectral states and comparison with different transients.
• The cross-‐correlaBon between various energy bands and the dependence of various periodiciBes on energy.
Nazma Islam
Raman Research Institute, Bangalore
Thesis Supervisor: Biswajit Paul
● Current Work:
X-ray binaries luminosity functions, Average spectral
properties of X-ray binaries with MAXI, Orbital resolved
spectroscopy of GX 301-2 with MAXI, pulse profiles and
spectral analysis of IGR J16393-4643 with Suzaku.
MIT-IUCAA Workshop on X-ray Studies of Transient Astronomical Sources 13-24 January 2014, IUCAA, Pune, India
DIRECTORY
Workshop Participants
Md Shah ALAM
Aru BERI
Varun BHALERAO
Manojendu CHOUDHURY
Brojal Gopal DUTTA
Mubashir HAMID
Nazma ISLAM
Nirmal IYER
Gaurava Kumar JAISAWAL
Future Work:
● X-ray transients analysis with RXTE-ASM, SWIFT-BAT
and MAXI and its effects on X-ray luminosity functions.
● Pulse profiles and spectral analysis of heavily obscured
sources with Suzaku.
● Orbital resolved spectroscopy of some bright HMXBs with
MAXI.
Nirmal Iyer
Ø PhD student. 4th year Ø ISRO Satellite Center, Bangalore Ø Guide – Dr. Seetha Ø Thesis Btle – Silicon PIN as an X-‐ray sky monitor. Ø Interests :
Ø Understanding the working of different sky monitors / comparing them.
Ø What parameters are most important for capturing transients using sky monitors. ?
Ø What type of objects end up as transients (in the X-‐ray band) in the sky and why?
MIT-IUCAA Workshop on X-ray Studies of Transient Astronomical Sources 13-24 January 2014, IUCAA, Pune, India
DIRECTORY
Workshop Participants
Md Shah ALAM
Aru BERI
Varun BHALERAO
Manojendu CHOUDHURY
Brojal Gopal DUTTA
Mubashir HAMID
Nazma ISLAM
Nirmal IYER
Gaurava Kumar JAISAWAL
Nirmal Iyer
Ø Work done Bll date Ø Design, development and test/characterisaBon of a single
pixel Si-‐PIN detector with readout(amplifiers and processing)
Ø Some work with the ongoing calibraBon of the Scanning Sky Monitor onboard ASTROSAT.
Ø Analysis of a Black-‐hole transient for spectral and Bming characterisBcs.
Ø Analysis of a couple of HMXB NS transients.
Gaurava K. Jaisawal Senior Research Fellow,
Astronomy and Astrophysics Division Physical Research Laboratory
Ahmedabad
Research Interest • High Mass X-ray Binary Pulsar
• Timing studies • Phase averaged spectroscopy • Phase resolved spectroscopy • Time resolved spectroscopy
Future Plans
• In future, I would like to continue my work related to X-ray pulsars. Also I am interested to work on the timing and spectral studies of the Low mass X-ray binary and transient Black hole binary sources.
Jithesh V. Department of Physics
University of Calicut Kerala
Supervisors : Dr. Ravikumar C. D. &
Dr. Ranjeev Misra
Research Topic : Multi-wavelength properties of X-ray point sources
Current Work : • Searched the counterpart of X-ray sources in
optical and Infrared bands and studied their multi-wavelength properties
• The broadband X-ray spectral study of ultra-luminous X-ray sources (ULXs)
In the workshop : • Spectral and temporal properties of
black hole X-ray transients
Chandreyee Maitra Raman Research Institute
Bangalore, India Thesis : High magnetic field neutron stars: Cyclotron
lines & Polarization
u Pulse phase resolved spectroscopy of cyclotron resonance scattering features (CRSF) in accretion powered pulsars
u Probing the nature of the narrow dips in pulse profiles of accretion powered pulsars.
u Thomson Polarimeter: Prospects for compact objects
JITHESH V
Chandreyee MAITRA
Bari MAQBOOL
Soma MANDAL
Aditya Sow MONDAL
Arunava MUKHERJEE
Dipanjan MUKHERJEE
Main PAL
Devraj PAWAR
Future Interests & Plans
l Look for luminosity dependent variations in the pulse phase dependence of cyclotron lines during outbursts in HMXBs : candidates: V 0332+53, A 0535+26, RX 0440.9+4431..
l Study the changes in circumstellar material during outbursts in HMXBs.
l Significantly increase the number of CRSF detections in X-ray pulsars to understand the magnetic field distribution of these sources especially at higher values of magnetic field strength
Bari MaqboolUniversity of Kashmir
Accretion Disk around Black Holes and Neutron Stars.
Regions which are irradiated by X-rays, emitted from inner regions.
Long term variability of such systems by solving global Time-dependent equations.
Future Work
To study the correlation between UV and X-Ray emission from X-ray Binaries
To get the long term light curves for X-Ray and optical radiation.
.
Current Research work
Soma Mandal Taki Government College, Taki, West Bengal
l Energy dependence of X-ray variability of black hole and l neutron star binaries
⎝ Amplitude and time/phase lag variation with energy of QPO
⎝ Variation of Bicoherence phase with energy
JITHESH V
Chandreyee MAITRA
Bari MAQBOOL
Soma MANDAL
Aditya Sow MONDAL
Arunava MUKHERJEE
Dipanjan MUKHERJEE
Main PAL
Devraj PAWAR
Future Plan
l Comparative spectral and temporal study of black hole l X-ray transients sources
l Multi-wavelength view of the same source
Aditya Sow Mondal Visva-‐BharaB, SanBniketan
West-‐Bengal, India
Current Work: Presently I am studying the broad-‐band X-‐ray emission from galacBc X-‐ray binary systems. I am carrying out extensive spectral analysis of the X-‐ray binary sources in the energy band 0.3-‐10.0 keV, trying to find out the nature of the broad-‐band X-‐ray conBnuum and the physical origin of the relaBvisBc iron line as well as the ionized absorpBon. I have performed the spectral analysis of the hard X-‐ray transient IGR J17497-‐2821 in detail and detected a broad iron K-‐α line with an FWHM≈ 25000 km/s
JITHESH V
Chandreyee MAITRA
Bari MAQBOOL
Soma MANDAL
Aditya Sow MONDAL
Arunava MUKHERJEE
Dipanjan MUKHERJEE
Main PAL
Devraj PAWAR
Future Interest
In many Neutron star(NS) and Black hole(BH) binaries, the X-‐ray telescopes XMM-‐Newton and Chandra have detected relaBvisBcally broadened Fe K-‐α emission lines at 6.4 keV. These emission lines are important probes of the dynamics of the mater in the strong gravity region near the NS and BH. The Bming analysis of these sources have revealed that the flux varies in a Bme scale as short as millisecond. The typical radial distance of the mater inferred from the dynamical Bme scale is about 15 – 100 km from a 1.4 solar mass NS and nearly 100 km from a 10 solar mass BH. This implies that a spectroscopic study as well as a Bming analysis will be helpful to understand the dynamics of the parBcles in a strong gravity regime and may also be used to test theories involving gravitaBon.
Name: Arunava Mukherjee Affiliation : Post-doctoral Fellow at
IUCAA, Pune
Past Research work: ü Studying X-ray variabilities across different time-
scale (msec to kilo-sec)
ü Quasi-periodic oscillations, particularly kHz QPOs
ü Frequency resolved spectroscopy
ü Thermonuclear (type-I) X-ray bursts and burst-oscillations
Future Interest Ø Disk-magnetosphere coupling and estimating long time
averaged accretion induced torque on neutron stars
Ø Photon energy dependent time-lag of various QPOs and noise components
Ø Evolution of variability correlated with spectral state from quiescence-to-quiescence through outburst
Ø Accretion disk-jet connection in transient low-mass X-ray binaries
Dipanjan Mukherjee Graduate student: IUCAA
Thesis supervisor: Dipankar Bhattacharya Primary work related to thesis: u Modelling accretion mounds on neutron stars confined at the polar cap.
u MHD simulations of spread of confined matter, role of instabilities in field evolution.
u Modelling cyclotron lines from high field neutron stars, effects of local field distortions.
Estimating magnetic fields of AMXPs u Constrain fields of AMXPs following the method outlined in Psaltis and Chakrabarty (1999).
u Work involves search for X-ray pulsations (performed by Peter Bult and Michiel van der Klis) and identifying the highest and lowest flux states with pulsations. Constrain the field by evaluating the source luminosity at those states.
Spectral and timing of black hole IGR J17497-2821 u Spectral and timing analysis of the black hole in hard state with XMM Newton and RXTE
(by Md. Shah Alam and Aditya S. Mondal).
u Energy dependent timing analysis. Change in PDS with energies. Higher RMS at higher energy. More in talks by Md. Shah Alam and Aditya S. Mondal.
JITHESH V
Chandreyee MAITRA
Bari MAQBOOL
Soma MANDAL
Aditya Sow MONDAL
Arunava MUKHERJEE
Dipanjan MUKHERJEE
Main PAL
Devraj PAWAR
Future interests related to transients
u Cyclotron lines and local emission geometry. Understanding the origin and nature of CRSF from phase resolved spectroscopy.
u Timing studies of high field X-ray pulsars, variation of break frequency with
luminosity. Can this track the accretion disc? Joint spectral and timing studies to probe emission region of high field X-ray pulsars.
u Why do some LMXBs pulse intermittently? Aql X-1, HETE J1900.1-2455, NGC 6440 X-2, Swift J1749.4-2807 etc.
o Why are pulsations masked? o What causes timing noise (hotspot motion?)? o Effect of dead disc/dammed accretion?
u Energy dependent timing analysis of black holes. o Where do the noise components (broad band lorentzians) originate? o What can this tell us about the accretion state?
Main Pal (IUCAA)
Supervisor: Gulab C Dewangan Topic: X-ray variability of AGNs
My research 1. I have studied the variable X-ray reflection from Seyfert 1
galaxy 1H 0 419-577. 2. Current project: Multiwavelength study of NLS1 galaxy II
Zw 177. Collaborators: Gulab C. Dewangan, Ranjeev Misra, Pramod Kumar
3. Study on IRAS 1324-23809 Collaborators: Gulab C. Dewangan, Matteo Guianazzi, Carlos Gabriel.
4. Suzaku broad-band X-ray study of Mrk 335 Collaborator: Gulab C. Dewangan
I want to study the variable X-ray reflection features from companion star of compact star. I have no data for such compact object with their companion star. In this case, I will try to collaborate with other participants.
Name : Devraj Pawar
Affiliation : Ph.D. Student, University of Mumbai
Present work : I have completed two projects, one related to kHz QPOs in a LMXB and the other related to LFQPOs in BHBs. At the moment I am working towards completion of my Ph.D. Thesis.
● After my Ph.D. I would like to continue working on X-ray studies of compact objects
● From this workshop I hope to obtain knowledge to enable me to continue studies of X-ray transient sources
PRAGATI PRADHAN
Affiliation: North Bengal University & Raman Research Institute Supervisors: Dr Bikash Chandra Paul & Dr Biswajit Paul
CURRENT WORK:
u X-ray Pulse Profile Stability Of Rotation Powered Pulsar
(PSR B1509-58) using RXTE. u Spectral and temporal Properties of accreting X-ray pulsars
SW J2000.6+3210 ,OAO 1657-415 using SWIFT & SUZAKU.
Pragati PRADHAN
Gayathri RAMAN
Jayashree ROY
Naveel Ahmad WANI
IUCAA Faculty, Local Organizers
Dipankar BHATTACHARYA
Ranjeev MISRA
Gulab DEWANGAN
FUTURE WORK
u Study of transient orbital behaviour of Hercules X-1 by mid-
eclipse time determination using RXTE archival data. u A comprehensive study of the broad band spectral and
pulsation properties of accreting X-ray pulsars with SUZAKU.
Gayathri RamanThesis supervisor- Prof. Biswajit Paul
Raman Research Institute, Bangalore
● Optical reprocessing of X-rays in Low Mass X-ray binary sources.
● Orbital modulations of the optical and X-ray light-curves to probe the possible
structures in the accretion disk
● Thermonuclear burst reprocessing in optical wavelengths.
● Light-curve modeling using X-ray Binary Code and Icarus software.
Pragati PRADHAN
Gayathri RAMAN
Jayashree ROY
Naveel Ahmad WANI
IUCAA Faculty, Local Organizers
Dipankar BHATTACHARYA
Ranjeev MISRA
Gulab DEWANGAN
Future Plans
● To understand the nature of X-ray reprocessing in transient X-ray binary
sources by studying the correlations between X-ray and optical profiles.
● To explore the possible reprocessing sites and their dimensions,
temperatures and orbital evolution.
● To probe the structure and geometry of regions close to the compact
object.
JAYASHREE ROY RESEARCH ASSOCIATE
CENTRE FOR EXCELLENCE IN BASIC SCIENCES University of Mumbai - Department of Atomic Energy (DAE)
λ Timing and spectral studies of the transient black hole X-ray binary MAXI J1659-152. (Jayashree Roy & P. C. Agrawal ) λ Long term (~ 15 years) spectral studies of transient black hole X-ray binary 4U 1630-472. (Manojendu Choudhury, Jayashree Roy et al. ) λ Study of pulsation evolution of IGR J19294+1816 and its spectral behavior. (Jayashree Roy & Manojendu Choudhury)
Pragati PRADHAN
Gayathri RAMAN
Jayashree ROY
Naveel Ahmad WANI
IUCAA Faculty, Local Organizers
Dipankar BHATTACHARYA
Ranjeev MISRA
Gulab DEWANGAN
FUTURE PLANS
λ Broadband timing & spectral study of transient X-ray binaries (BH/ NS). Search for quasi-periodicity and its dependence on energy. To study the generation mechanism, origin & location of LFQPO's and HFQPO's. λ Correlation study of temporal and spectral properties of X-ray binaries. Orbital Evolution of Pulsars and Eclipsing binaries, Quasi-Periodic Intensity Variations in pulsars, cyclotron absorption features, pulse period and its variation, Pulse phase resolved spectroscopy of X-ray pulsar sources.
λ To study the stability of emission in rotation power pulsars and magnetars. Instrumentation for X-ray astronomy (proportional counter array, CdTe x-ray detector, polarimeter).
NAME: NAVEEL AHMAD WANI AFFILATION: DEPARTMENT OF PHYSICS,
KASHMIR UNIVERSITY
CURRENT WORK
I have done project on the effects of thermonuclear burst on QPOs in NS LMXR Binaries. The Light Curve and
Power Density Spectrum of the 4U 1636-536 (well known low mass X-ray Binary) suggest that there is clear relation
between QPOs and Thermonuclear Bursts.
FUTURE INTEREST
1. X-ray spectroscopy at different orbital cycles so that one could detect the various emission lines in the spectra. 2. Detailed spectral and timing analysis of X-rays so that nature of the sources can easily be known.
