Search Publications
Prospects for multimessenger detection of binary neutron star mergers in the fourth LIGO-Virgo-KAGRA observing run
Patricelli, Barbara; Bernardini, Maria Grazia; Mapelli, Michela +5 more
The joint detection of GW170817 and GRB 170817A opened the era of multimessenger astronomy with gravitational waves (GWs) and provided the first direct probe that at least some binary neutron star (BNS) mergers are progenitors of short gamma-ray bursts (S-GRBs). In the next years, we expect to have more multimessenger detections of BNS mergers, th…
INTEGRAL/IBIS 17-yr hard X-ray all-sky survey
Tsygankov, Sergey S.; Lutovinov, Alexander A.; Krivonos, Roman A. +3 more
The International Gamma-Ray Astrophysics Laboratory (INTEGRAL), launched in 2002, continues its successful work in observing the sky at energies E > 20 keV. The legacy of the mission already includes a large number of discovered or previously poorly studied hard X-ray sources. The growing INTEGRAL archive allows one to conduct an all-sky survey…
Study of changes in the pulsation period of 148 Galactic Cepheid variables
Szabados, L.; Cseh, B.; Molnár, L. +7 more
Investigating period changes of classical Cepheids through the framework of O - C diagrams provides a unique insight to the evolution and nature of these variable stars. In this work, the new or extended O - C diagrams for 148 Galactic classical Cepheids are presented. By correlating the calculated period change rates with the Gaia EDR3 colours, w…
An INTEGRAL/SPI view of reticulum II: particle dark matter and primordial black holes limits in the MeV range
Calore, Francesca; Vincent, Aaron C.; Diehl, Roland +4 more
Reticulum II (Ret II) is a satellite galaxy of the Milky Way (MW) and presents a prime target to investigate the nature of dark matter (DM) because of its high mass-to-light ratio. We evaluate a dedicated INTEGRAL observation campaign data set to obtain γ-ray fluxes from Ret II and compare those with expectations from DM. Ret II is not detected in…
Energetic transients joint analysis system for multi-INstrument (ETJASMIN) for GECAM - I. Positional, temporal, and spectral analyses
Gao, Min; Gong, Ke; Qiao, Rui +67 more
Gravitational wave high-energy Electromagnetic Counterpart All-sky Monitor (GECAM) is a dedicated mission, launched in December 2020, for gamma-ray transients, including gamma-ray bursts (GRBs) and soft gamma repeater (SGR) bursts in the multimessenger and multiwavelength astronomy era. Since GECAM consists of two independent spacecrafts (or say i…
Constraining spinning primordial black holes with global 21-cm signal
Natwariya, Pravin Kumar; Nayak, Alekha C.; Srivastava, Tripurari
We study the upper projected bounds on the dark matter fraction in the form of the primordial black holes (PBHs) with a non-zero spin by using the absorption feature in the global 21-cm signal at redshift z ≈ 17. The mass and spin are fundamental properties of a black hole, and they can substantially affect the evaporation rate of the black hole. …
Hard-X-ray-selected active galactic nuclei - II. Spectral energy distributions in the 5-45 GHz domain
Laor, Ari; Behar, Ehud; Baldi, Ranieri D. +7 more
A wide-frequency radio study of active galactic nuclei (AGN) is crucial to evaluate the intervening radiative mechanisms responsible for the observed emission and relate them with the underlying accretion physics. We present wide-frequency (5-45 GHz), high-sensitivity (few $\mathrm{{\mu }Jy\, beam^{-1}}$), (sub)-kpc Jansky Very Large Array (JVLA) …
Chemical evolution of 26Al and 60Fe in the Milky Way
Matteucci, F.; Spitoni, E.; Vasini, A.
We present theoretical mass estimates of 26Al and 60Fe throughout the Galaxy, performed with a numerical chemical evolution model including detailed nucleosynthesis prescriptions for stable and radioactive nuclides. We compared the results for several sets of stellar yields taken from the literature, for massive, low and inte…
SU Lyn - a transient symbiotic star
Iłkiewicz, Krystian; Mikołajewska, Joanna; Scaringi, Simone +3 more
SU Lyn is a binary system composed of a white dwarf and a red giant star. Although it is known to be bright and variable at X-ray wavelengths, the optical counterpart of the source appeared as a single red giant without prominent emission lines. Because of the lack of optical features typical for interacting systems, the system was classified as a…
Hard X-ray luminosity functions of cataclysmic variables: joint Swift/BAT and Gaia data
Doroshenko, Victor; Suleimanov, Valery F.; Werner, Klaus
Cataclysmic variables (CVs) are the most numerous population among the Galactic objects emitting in hard X-rays. Most probably, they are responsible for the extended hard X-ray emission of the Galactic ridge and the central Galactic regions. Here, we consider the sample of CVs detected in the all-sky hard X-ray Swift/BAT survey, which were also de…