Broad-band gamma-ray and X-ray spectra of NGC 4151 and their implications for physical processes and geometry

Abstract

We study gamma-ray observations of NGC 4151 by GRO/OSSE contemporaneous with X-ray observations by ROSAT and Ginga in 1991 June and with ASCA in 1993 May. The spectra are well modeled by thermal Comptonization and a dual neutral absorber. We also find, for the first time for NGC 4151, a Compton-reflection spectral component in the Ginga/OSSE data. The OSSE spectra of those and other observations of NGC 4151 are statistically undistinguishable from the average OSSE spectrum of radio-quiet Seyfert 1s. NGC 4151 observed in 1991 and 1993 has the intrinsic X-ray/gamma-ray spectrum typical for Seyfert 1s, and the main property distinguishing it from other Seyfert 1s is a large absorbing column of $\sim 10^{23}$ cm${}^{-2}$. We find no evidence for a strong, broad and redshifted, Fe K$\alpha$ line component in the ASCA spectrum of 1993 May. On the other hand, we confirm previous studies in that archival X-ray data do imply strong intrinsic X-ray variability and hardness of the intrinsic spectrum in low X-ray states. An observed softening of the intrinsic X-ray spectrum with the increasing flux implies variability in gamma-rays weaker than in X-rays, which agrees with the 100 keV flux changing only within a factor of 2 in archival OSSE and Granat/SIGMA observations. The relative hardness of the intrinsic X-ray spectrum rules out the homogeneous hot corona/cold disk model for this source. Instead, the hot plasma has to subtend a small solid angle as seen from the source of UV radiation. If the hot plasma is purely thermal, it consists of electrons rather than $e^{+}{e}^{-}$ pairs. On the other hand, the plasma can be pair-dominated if a small fraction of the power is nonthermal.

15 pages, 8 Postscript figures, MNRAS accepted

Cited by in corpus (551)

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• AstroSat and MAXI view of Cygnus X-1: Signature of an `extreme' soft nature
• Bhjet: a public multi-zone, steady state jet + thermal corona spectral model
• The Accreting Black Hole Swift J1753.5-0127 from Radio to Hard X-Ray
• Eclipse Mapping of EXO 0748-676: Evidence for a Massive Neutron Star
• Suzaku Observation of the High-Inclination Binary EXO 0748-676 in the Hard State
• Soft time lags in the X-ray emission of Mrk 1040
• Observation of Cen A by the Rossi X-ray Timing Explorer
• Common origin for black holes in both high mass X-ray binaries and gravitational-wave sources
• Discovery of a correlation between the frequency of the mHz quasi-periodic oscillations and the neutron-star temperature in the low-mass X-ray binary 4U 1636-53
• The outburst of the changing-look AGN IRAS23226-3843 in 2019
• Gamma-ray and Neutrino Signals from Accretion Disk Coronae of Active Galactic Nuclei
• Coronal temperatures of the AGN ESO 103-035 and IGR 2124.7+5058 from NuSTAR observations
• Spectral modeling of the three spectral states of the Galactic microquasar GRS 1915+105
• Simultaneous Optical/X-ray study of GS 1354-64 (=BW Cir) during hard outburst: evidence for optical cyclo-synchrotron emission from the hot accretion flow
• Reflection component in the Bright Atoll Source GX 9+9
• Analysis of the reflection spectra of MAXI J1535-571 in the hard and intermediate states
• Identifying the radiative components responsible for Quasi-Periodic Oscillations of black hole systems
• Detection of significant X-ray polarization from transient NS-LMXB XTE J1701-462 with IXPE and its implication on the coronal geometry
• The most luminous blue quasars at 3.0<z<3.3. II. CIV/X-ray emission and accretion disc physics
• Accretion disk/corona emission from a radio-loud narrow line Seyfert 1 galaxy PKS 0558-504
• Spectral properties of NGC 4151 and the Estimation of black hole mass using TCAF solution
• Properties of the Obscuring Torus in NGC 1052 from Multi-epoch Broadband X-ray Spectroscopy
• Thermonuclear X-ray bursts from LMXB 4U 1636$-$536 observed with AstroSat
• AstroSat/LAXPC view of GX 17+2: Spectral Evolution along the Z-track
• High hard X-ray polarization in Cygnus X-1 confined to the intermediate hard state: evidence for a variable jet component
• Rapidly alternating flux states of GX 339-4 during its 2021 outburst captured by Insight-HXMT
• Relation between spectral changes and the presence of the lower kHz QPO in the neutron-star low-mass X-ray binary 4U 1636-53
• Re-awakening of GRS 1716--249 after 23 years, observed by {\it Swift}/XRT and {\it NuSTAR}
• Broadband spectral analysis of MXB 1659-298 in its soft and hard state
• Spectral analysis of the dipping LMXB system XB 1916-053
• Spectral properties of MXB 1658-298 in the low/hard and high/soft state
• A deep X-ray view of the bare AGN Ark 120. VI. Geometry of the hot corona from spectroscopic and polarization signatures
• The 2015 hard-state only outburst of GS 1354-64
• An XMM-Newton and INTEGRAL view on the hard state of EXO 1745-248 during its 2015 outburst
• Investigating the interplay between the coronal properties and the hard X-ray variability of active galactic nuclei with NuSTAR
• Relation between the properties of the kilohertz quasi-periodic oscillations and spectral parameters in 4U 1636$-$53
• A detailed study on the reflection component for the Black Hole Candidate MAXI J1836-194
• A variable magnetic disc wind in the black hole X-ray binary GRS 1915+105?
• The 2015 outburst of the accreting millisecond pulsar IGR J17511-3057 as seen by INTEGRAL, Swift and XMM-Newton
• Type I X-ray bursts' spectra and fuel composition from the atoll and transient source 4U 1730$-$22
• Spectral analysis of the low-mass X-ray pulsar 4U 1822-371: Reflection component in a high-inclination system
• The AstroSat observation of accreting millisecond X-ray pulsar SAX J1808.4-3658 during its 2019 outburst
• Coronal properties of the Seyfert 1 galaxy 3C 120 with NuSTAR
• A different view of wind in X-ray binaries: The Accretion Disc Corona source 2S 0921-630
• On the Nature of the High-Energy Rollover in 1H 0419-577
• The broadband spectral analysis of 4U 1702-429 using XMM-Newton and BeppoSAX data
• Constraining the Coronal Heights and Readjustment Velocities Based on the Detection of a Few Hundred Seconds Delays in the Z Source GX 17+2
• A Machine Learning approach for classification of accretion states of Black hole binaries
• Phase-resolved analyses of mHz quasi-periodic oscillations in 4U 1636-53 using Hilbert-Huang transform
• Simultaneous detection of an intrinsic absorber and a compact jet emission in the X-ray binary IGR J17091-3624 during a hard accretion state
• Energy-dependent variability of the bare Seyfert 1 galaxy Ark 120
• A multi-wavelength study of the hard and soft states of MAXI J1820+070 during its 2018 outburst
• Broadband X-ray analysis of 1E 1740.7-2942: constraints on spin, inclination and a tentative black hole mass
• Spectral and timing evolution of MAXI J1631-479 during the 2018-19 outburst with NICER
• A deep, multi-epoch Chandra HETG study of the ionized outflow from NGC 4051
• The two Ultraluminous X-ray sources in the galaxy NGC 925
• Long-term Spectral Variability of the Ultra-luminous X-ray source Holmberg IX X--1
• Follow-up Observations of the Prolonged, super-Eddington, Tidal Disruption Event Candidate 3XMM~J150052.0+015452: the Slow Decline Continues
• Broadband Spectral Analysis of Aql X-1
• The December 2015 re-brightening of V404 Cyg: Variable absorption from the accretion disc outflow
• The X-ray corona in the black-hole binary GRO J1655--40 from the properties of non-harmonically related quasi-periodic oscillations
• Gamma-Ray Emission in the Seyfert Galaxy NGC 4151: Investigating the Role of Jet and Coronal Activities
• Trace the Accretion Geometry of H 1743--322 with Type C Quasi-periodic Oscillations in Multiple Outbursts
• Broadband X-ray emission and the reality of the broad iron line from the Neutron Star - White Dwarf X-ray binary 4U 1820-30
• MAXI and NuSTAR observations of the faint X-ray transient MAXI J1848-015 in the GLIMPSE-C01 Cluster
• The lively accretion disk in NGC 2992. II. The 2019/2021 X-ray monitoring campaigns
• Suzaku investigation into the nature of the nearest ultraluminous X-ray source, M33 X-8
• Evidence of a non-conservative mass transfer in the ultra-compact X-ray source XB 1916-053
• Do stellar-mass and super-massive black holes have similar dining habits?
• A truncated accretion disk in the galactic black hole source H1743-322
• Origin of the "Disk-Line" Feature in the X-Ray Energy Spectrum of a Seyfert Galaxy, NGC4151
• NGC 7793 P9: An Ultraluminous X-Ray Source Evolved from a Canonical Black Hole X-Ray Binary
• AstroSat view of LMC X-2: Evolution of broadband X-ray spectral properties along a complete Z-track
• A Hard-to-Soft State Transition of Aquila X-1 Observed with Suzaku
• AstroSat detection of a mHz QPO and cyclotron line in IGR J19294+1816 during the 2019 outburst
• A catalog of optical to X-ray spectral energy distributions of z~2 quasars observed with Swift. I: First results
• Search for coronal temperature variation in Seyfert galaxies
• Multi-wavelength spectroscopy of the black hole candidate MAXI J1813-095 during its discovery outburst
• Wavelength Dependences of the Optical/UV and X-ray Luminosity Correlations of Quasars
• X-ray spectral correlations in a sample of Low-mass black hole X-ray binaries in the hard state
• Coronal Properties of Low-Accreting AGNs using Swift, XMM-Newton and NuSTAR Observations
• The long-stable hard state of XTE J1752-223 and the disk truncation dilemma
• An Insight-HXMT view of the mHz quasi-regular modulation phenomenon in the black hole X-ray binary 4U 1630-47
• A moderate spin for the black hole in X-ray binary MAXI J1348-630 revealed by Insight-HXMT
• AstroSat view of the neutron star low-mass X-ray binary GX 340+0
• Spectral state transitions in Circinus ULX5
• Reflare in MAXI J1348-630]{Evolution of disc and corona in MAXI J1348-630 during the 2019 reflare: NICER and Insight-HXMT view
• The very faint hard state of the persistent neutron star X-ray binary SLX 1737-282 near the Galactic centre
• A Chandra observation of the millisecond X-ray pulsar IGR J17511-3057
• The X-ray spectral-timing contribution of the stellar wind in the hard state of Cyg X-1
• Multi-wavelength Campaign on the Super-Eddington NLS1 RX J0134.2-4258 -- I. Peculiar X-ray Spectra and Variability
• Constraining the contribution of Seyfert galaxies to the diffuse neutrino flux in light of point source observations
• Stratified wind from a super-Eddington X-ray binary is slower than expected
• Broad-band spectral analysis of LMXB XTE J1710-281 with Suzaku
• The study of thermonuclear X-ray bursts in accreting millisecond pulsar MAXI J1816-195 with NuSTAR and NICER
• X-ray and Optical Observations of the Black Hole Candidate MAXI J1828-249
• Detection of a low frequency quasi-periodic oscillation in the soft state of Cygnus X-1 with Insight-HXMT
• Discovery and Long-term Broadband X-ray monitoring of Galactic Black Hole Candidate MAXI J1803-298
• The NuSTAR view of the changing look AGN ESO 323-G77
• Torque reversal and cyclotron absorption feature in HMXB 4U 1538-522
• Subaru High-Dispersion Spectroscopy of Narrow-Line Region in the Seyfert Galaxy NGC 4151
• A retrograde spin of the black hole in MAXI J1659--152
• Quasi-simultaneous Integral, Swift, And Nustar Observations Of The New X-ray Clocked Burster 1rxsj180408.9-342058
• A New Possible Accretion Scenario for Ultra-Luminous X-ray Sources
• Reflection features in the X-ray spectrum of Fairall 9 and implications for tests of general relativity
• The disk wind in GRS 1915+105 as seen by Insight-HXMT
• Accretion disc-corona and jet emission from the radio-loud narrow-line Seyfert 1 galaxy RX J1633.3+4719
• The thermonuclear X-ray bursts of 4U 1730-22
• Multi-wavelength view of the galactic black-hole binary GRS 1716-249
• A Suzaku Observation of the Low-Mass X-Ray Binary GS 1826-238 in the Hard State
• Revealing Thermal Comptonization of accretion-disk photons in IC4329A with AstroSat
• Proof of principle X-ray reflection mass measurement of the black hole in H1743-322
• Evidence of disc reflection in the X-ray spectrum of the neutron star low mass X-ray binary 4U 1636-536
• NuSTAR observations of the ultraluminous X-ray source M33 X-8: a black hole in a very high state?
• Discovery of cyclotron and narrow Fe K${}_{\alpha }$ lines in HMXB GRO J1750-27
• NICER and Swift/XRT monitoring of the 2023 outburst of Swift J1727.7-1613
• A faint outburst of the accreting millisecond X-ray pulsar SAX J1748.9-2021 in NGC 6440
• Modelling the energy dependencies of high-frequency QPO in black hole X-ray binaries
• On measuring the Hubble constant with X-ray reverberation mapping of active galactic nuclei
• Fe K$\alpha$ and Fe K$\beta$ line detection in the NuSTAR spectrum of the ultra-bright Z-source Scorpius X-1
• Complex Optical/UV and X-ray Variability of the Seyfert 1 galaxy 1H 0419-577
• Phase-resolved spectral analysis of the 11 millihertz quasi-periodic oscillation in the black-hole candidate H1743-322
• Study of the reflection spectra of SAX J1748.9-2021
• Swift J1728.9-3613 is a black hole X-ray binary: spectral and timing study using NICER
• The bright black hole X-ray binary 4U 1543--47 during 2021 outburst: a thick accretion disk inflated by high luminosity
• Variable ionized disk wind in MAXI J1803-298 revealed by NICER
• The black hole spin in GRS 1915+105, revisited
• Rapid spectral transition of the black hole binary V404 Cyg
• Evolution of the Comptonizing medium of the black-hole candidate Swift J1727.8$-$1613 along the hard to hard-intermediate state transition using NICER
• Global Accretion Properties of Black Hole X-Ray Binaries: A Phenomenological Perspective
• On the ultra-compact nature of the neutron star system 1RXS J170854.4-321857: insights from X-ray spectroscopy
• Discovery of a long thermonuclear X-ray burst from the ultra-compact binary 4U 1850$-$087
• Relativistic reflection in NGC 4151
• NuSTAR spectral analysis of three Seyfert galaxies: NGC 3227, NGC 5548 and MR 2251$-$178
• AstroSat view of `Clocked` burster GS 1826-238:broad-band spectral nature of persistent and burst emission during soft state
• Suzaku Observations of Spectral Variations of the Ultra Luminous X-ray Source Holmberg IX X-1
• The inner flow geometry in MAXI J1820+070 during hard and hard-intermediate states
• Spectral-Timing Analysis of the Lower kHz QPO in the Low-Mass X-ray Binary Aquila X-1
• Detection of QPO Soft Lag during Outburst of Swift J1727.8-1613: Estimation of Instrinsic Parameters from Spectral Study
• Broadband X-ray properties of black holes GRS 1758-258 and 1E 1740.7-2942: AstroSat and NuSTAR results
• Spectral analysis of the AMXP IGR J17591-2342 during its 2018 outburst
• AstroSat and NuSTAR observations of XTE J1739-285 during the 2019-2020 outburst
• An extreme Ultraluminous X-ray source X-1 in NGC 5055
• Probing the accretion geometry of the atoll source 4U 1702-429 in different spectral states with NICER, NuSTAR, and AstroSat
• The spin measurement of MAXI J1348-630 using the Insight-HXMT data
• Broadband spectro-temporal investigation of neutron star low-mass X-ray binary GX 349+2
• Breaking the rules at $z\simeq$0.45: the rebel case of RBS 1055
• NuSTAR observation of GRO J1744-28 at low mass accretion rate
• High-energy Emission from Turbulent Electron-ion Coronae of Accreting Black Holes
• Understanding the Inner Structure of Accretion disk in GX 17+2: AstroSat's Outlook
• AstroSat view of spectral transition in the changing-look active galaxy NGC1566 during the declining phase of the 2018 outburst
• Evidence of hard power-law spectral cutoff and disc reflection features from the X-ray transient XTE J1739-285
• Spectra of Puffy Accretion Discs: the kynbb Fit
• Revisiting the galactic X-ray binary MAXI J1631-479: Implications for high inclination and a massive black hole
• Disk reflection and energetics from the accreting millisecond pulsar SRGA J144459.2-604207
• Evolution of the Accretion Disk and Corona During the Outburst of the Neutron Star Transient MAXI J1807+132
• XMM-Newton --NuSTAR monitoring campaign of the Seyfert 1 galaxy IC 4329A
• Relativistic reflection within an extended hot plasma geometry
• A Search for X-ray/UV Correlation in the Reflection-Dominated Seyfert 1 Galaxy Mrk 1044
• AstroSat Observation of 2016 Outburst of H 1743-322
• Timing and spectral studies of Cen X-3 in multiple luminosity states using $\text{AstroSat}$
• Accretion Properties and Estimation of Spin of Galactic Black Hole Candidate Swift J1728.9-3613 with NuSTAR during its 2019 outburst
• Broadband observations of the X-ray burster 4U 1705-44 with BeppoSAX
• Impact of reflection Comptonization on X-ray reflection spectroscopy: the case of EXO 1846-031
• Large-amplitude rapid X-ray variability in the narrow-line Seyfert 1 galaxy PG 1404$+$226
• Insight-HXMT Detections of Hard X-ray Tails in Scorpius X-1
• Swift unveils the orbital period of IGR J18214-1318
• Suzaku Observation of X-ray Variability in Soft State LMC X-1
• The origin of the soft excess in the luminous quasar HE 1029-1401
• Broadband X-ray Spectroscopy and Estimation of Spin of the Galactic Black Hole Candidate GRS 1758-258
• Stellar wind structures in the eclipsing binary system IGR J18027-2016
• Relativistic Reflection Modeling in AGN and Related Variability from PCA: A Brief Review
• NuSTAR and Swift observations of Swift J1357.2-0933 during an early phase of its 2017 outburst
• X-ray spectral properties of the accreting millisecond pulsar IGR J17498-2921 during its 2023 outburst
• Hard X-Ray broadband spectroscopy of Mrk 876: characterizing its spectrum
• The Low Temperature Corona in ESO 511$-$G030 Revealed by NuSTAR and XMM-Newton
• The NuSTAR view of the Seyfert Galaxy HE 0436-4717
• Long-term XMM-Newton view of magnetar CXOU J010043.1$-$721134: Comprehensive spectral and temporal results
• Probing thermonuclear bursts and X-ray reflection features in Aql X-1 during 2024 outburst
• AstroSat observation of rapid Type-I thermonuclear burst from the low mass X-ray binary GX 3+1
• BeppoSAX and XMM-Newton spectral study of 4U 1735-44
• Reverberation lags viewed in hard X-rays from an accreting stellar-mass black hole
• 20 years of disk winds in 4U 1630-47 -- I. Long-term behavior and influence of hard X-rays
• A New Characterization of the Compton Process in the ULX Spectra
• A Systematic Search for X-ray Eclipse Events in Active Galactic Nuclei Observed by Swift
• X-ray spectroscopy of the accretion disk corona source 2S 0921-630 with Suzaku archival data
• The Reliability of Accretion Disk Inclination Derived from X-ray Spectroscopy of Active Galaxies
• Hyper-massive Black Holes have Faint Broad and Narrow Emission Lines
• Modelling the variable broad-band optical/UV/X-ray spectrum of PG1211+143: Implications for the ionized outflow
• Reconstructing AGN X-ray spectral parameter distributions with Bayesian methods II: Population inference
• Broad-band spectral analysis of LMXB 2S 0921-63 with Suzaku
• Likely detection of magnetic field related LFQPO in the soft X-ray re-brightening of GRS~1915+105
• Measuring black hole spins with x-ray reflection spectroscopy: A GRMHD outlook
• Dimming GRS 1915+105 observed with NICER and Insight--HXMT
• An enigmatic hump around 30 keV in Suzaku spectra of Aquila X-1 in the Hard State
• Swift J1753.5-0127 : Understanding the accretion geometry through frequency resolved spectroscopy
• The Origin of The Soft X-Ray Excess in the Seyfert 1.5 Galaxy ESO 362-G18
• Reconstructing AGN X-ray spectral parameter distributions with Bayesian methods I: Spectral analysis
• AstroSat View of Transient Low-mass X-ray Binary XTE J1701-462: Spectral and Temporal Evolution along the Z-track
• RELXILL_NK: A Black Hole Relativistic Reflection Model for Testing General Relativity
• A Detailed Spectral Study of Intermittent-Accreting Millisecond X-ray Pulsar Aql X-1 during Pulse-on and Pulse-off Stages
• Spectro-polarimetric study to constrain accretion-ejection properties of MCG-5-23-16 using IXPE and NuSTAR observations
• Flares in the Changing Look AGN Mrk 590. II: Deep X-ray observations reveal a Comptonizing inner accretion flow
• Lamp-post with an outflow and the hard state of Cyg X-1
• X-ray Absorption and Reprocessing in the $z\sim 2.5$ Lensed Quasar 2MASS J1042+1641
• Black hole spin estimation of XTE J2012+381 using simultaneous observations of Swift/XRT and NuSTAR
• On the Relation between the Inclination Angle of the Accretion Disk and the Broad-line Region in Active Galactic Nuclei
• Exploring the accretion-ejection geometry of GRS 1915+105 in the obscured state with future X-ray spectro-polarimetry
• Spectral and Timing Analysis of NuSTAR and Swift/XRT Observations of the X-Ray Transient MAXI J0637-430
• Strong gravity and X-ray spectroscopy
• XMM-Newton view of a hard X-ray transient IGR J17497-2821
• A possible two-fold scenario for the disc-corona of the luminous AGN 1H 0419--577: a high-density disc or a warm corona
• The NuSTAR view of Ultra-Compact X-ray Binaries
• Detection and Characterization of Quasi-Periodic Oscillations in Seyfert Galaxy NGC 4151
• A truncated inner disc in the Seyfert 1 galaxy WKK 4438
• Search For Gravitational Redshifted Absorption Lines In LMXB Serpens X-1
• Reprocessing from highly ionized gas in the soft spectral state of V4641 Sgr with NuSTAR
• Drop in the hard pulsed fraction and a candidate cyclotron line in IGR J16320-4751 seen by NuSTAR
• QPOML: A Machine Learning Approach to Detect and Characterize Quasi-Periodic Oscillations in X-ray Binaries
• XMM-Newton and Swift Observations of the Seyfert 1 AGN NGC 5940
• Tracing the outburst decay of soft X-ray transients Aql X-1 and 4U 1608-52 with XSPECT
• X-ray and Gamma-ray Emission from a High-Temperature Plasma and the Spectra of Accreting Black Holes
• Resolving SLX 1744-299 and SLX 1744-300 in the hard X-ray band: implications for their ultracompact nature
• Recurrent Instability in LMXB Accretion Disks: How Strange is GRS 1915+105?
• Testing General Relativity with Black Hole X-Ray Data and ABHModels
• A NICER and AstroSat view of the neutron star low-mass X-ray binary 1A 1246-588
• Photon Escape from Slab Thomson Media: A Scattering-order-resolved Recursive Formalism for Comptonization Applications
• Accretion-disk reflection in the Seyfert 1 galaxy NGC 3783 as viewed by Chandra grating spectroscopy
• The X-ray statistical properties of dust-obscured galaxies detected by eROSITA
• The complex spectral behavior of the newly discovered neutron star X-ray binary Swift J1858.6-0814
• The study of the circumnuclear environment of accreting supermassive black holes with realistic X-ray spectral models
• An analytic function fit to Monte-Carlo X- and gamma-ray spectra from Thomson thick thermal/nonthermal hybrid plasmas
• Spectral Analysis of the 2019 and 2022 Outbursts of SAX J1808.4-3658
• X-rays and gamma rays from active galactic nuclei
• Probing heartbeat oscillations from the black hole X-ray binary GRS 1915+105 using spectral-timing analysis
• Testing General Relativity with Black Holes
• Evidence of Heavy Obscuration in the Low-Luminosity AGN NGC 4941
• Testing non-circular black hole spacetime with X-ray reflection
• Evidence for coronal temperature variation in Seyfert 2 ESO 103--035 using NuSTAR observations
• Comprehensive Spectral Analysis of Cyg X-1 using RXTE Data
• The extreme properties of the nearby hyper-Eddington accreting Active Galactic Nucleus in IRAS 04416+1215
• X-ray Iron absorption line in Swift J1858.6-0814
• Photospheric Radius Expansion and a double-peaked type-I X-ray burst from GRS 1741.9-2853
• Spectral and timing properties of the black hole candidate X1755-338 observed in 1989-1995
• Broad-band spectral study of LMXB black hole candidate 4U 1957+11 with NuSTAR
• Exploring the spectral characteristics of the periodic burster 4U 1323-62: Type-I X-ray burst and persistent emission
• Thermal Comptonization in a changing corona in the changing-look active galaxy NGC 1566
• X-ray polarization observations of NGC 2110 with IXPE