Search Publications
Hard X-rays and QPO in Swift J1727.8-1613: the rise and plateau of the 2023 outburst
Sunyaev, R.; Krivonos, R.; Sazonov, S. +5 more
We report on the detection of type-C quasi-periodic oscillations during the initial stages of the outburst of Swift J1727.8-1613 in 2023. Using data of the INTEGRAL observatory along with the data of the Mikhail PavlinskyART-XC telescope on board Spektr-RG and X-ray Telescope (XRT) of the Neil Gehrels Swift observatory the fast growth of the quasi…
Sub-GeV dark matter annihilation: limits from Milky Way observations with INTEGRAL
Calore, Francesca; Siegert, Thomas; Serpico, Pasquale Dario
From 16 years of INTEGRAL/SPI γ-ray observations, we derive bounds on annihilating light dark matter particles in the halo of the Milky Way up to masses of about 300 MeV. We test four different spatial templates for the dark matter halo, including a Navarro-Frenk-White (NFW), Einasto, Burkert, and isothermal sphere profile, as well as three differ…
Investigating the orbital evolution of the eccentric HMXB GX 301-2 using long-term X-ray light curves
Paul, Biswajit; Kumar, Manish; Rana, Vikram +1 more
We report the orbital decay rate of the high-mass X-ray binary GX 301-2 from an analysis of its long-term X-ray light curves and pulsed flux histories from CGRO/BATSE, RXTE/ASM, Swift/BAT, Fermi/GBM, and MAXI by timing the pre-periastron flares over a span of almost 30 yr. The time of arrival of the pre-periastron flares exhibits an energy depende…
Inferring system parameters from the bursts of the accretion-powered pulsar IGR J17498-2921
Galloway, D. K.; Goodwin, A. J.; Hilder, T. +2 more
Thermonuclear (type-I) bursts exhibit properties that depend both on the local surface conditions of the neutron stars on which they ignite, as well as the physical parameters of the host binary system. However, constraining the system parameters requires a comprehensive method to compare the observed bursts to simulations. We have further develop…
Probing the accretion geometry of the atoll source 4U 1702-429 in different spectral states with NICER, NuSTAR, and AstroSat
Homan, Jeroen; Banerjee, Srimanta
We perform a comprehensive spectral study of a carefully selected sample (total exposure ~50.5 ks) of NICER observations of the atoll neutron star low-mass X-ray binary 4U 1702-429. Our sample encompasses nearly all classical spectral states found within the NICER data set. We require two thermal emission components, originating from the accretion…
Long-term evolution of cyclotron line energy in an eclipsing pulsar 4U 1538-522
Tobrej, Mohammed; Rai, Binay; Ghising, Manoj +2 more
We present the timing and spectral analysis of the high-mass X-ray binary source 4U 1538-522 using Nuclear Spectroscopic Telescope Array (NuSTAR) observations. One of the observations partially covers the X-ray eclipse of the source along with eclipse ingress. The source is found to spin down at the rate of 0.163 ± 0.002 s yr-1 between …
Swift, NuSTAR, and INTEGRAL observations of the symbiotic X-ray binary IGR J16194-2810
Ducci, L.; Romano, P.; Ferrigno, C. +1 more
We report on a simultaneous observational campaign with both Swift/XRT and NuSTAR targeting the symbiotic X-ray binary (SyXB) IGR J16194-2810. The main goal of the campaign was to investigate the possible presence of cyclotron scattering absorption features in the broad-band spectrum of the source, and help advance our understanding of the process…
The SAMI galaxy survey: on the importance of applying multiple selection criteria for finding Milky Way analogues
Bland-Hawthorn, Joss; van de Sande, Jesse; Sweet, Sarah M. +10 more
Milky Way analogues (MWAs) provide an alternative insight into the various pathways that lead to the formation of disc galaxies with similar properties to the Milky Way (MW). In this study, we explore different selection techniques for identifying MWAs in the Sydney-AAO (Australian Astronomical Observatory) Multi-object Integral field spectrograph…
SRG/ART-XC Galactic Bulge deep survey. II. Catalogue of point sources
Sunyaev, R.; Krivonos, R.; Sazonov, S. +20 more
We present a catalogue of point sources detected with the Mikhail Pavlinsky ART-XC telescope onboard the SRG observatory during a wide-field survey of the Galactic Bulge that was conducted as part of the mission's calibration and performance verification phase in 2019. The survey consisted of nearly 18 d of consecutive scanning observations of the…
Constraints on the ultra-high energy cosmic ray output of gamma-ray bursts
Gendre, B.; Orange, N. B.; Moore, E. +1 more
Ultra-high energy cosmic rays are the most extreme energetic particles detected on Earth, however, their acceleration sites are still mysterious. We explore the contribution of low-luminosity gamma-ray bursts to the ultra-high energy cosmic ray flux, since they form the bulk of the nearby population. We analyse a representative sample of these bur…