Search Publications
Reanalysis of the MACHO Constraints on PBH in the Light of Gaia DR3 Data
García-Bellido, Juan; Hawkins, Michael
The recent astrometric data of hundreds of millions of stars from Gaia DR3 has allowed for a precise determination of the Milky Way rotation curve up to 28 kpc. The data suggest a rapid decline in the density of dark matter beyond 19 kpc. We fit the whole rotation curve with four components (gas, disk, bulge, and halo), and compute the microlensin…
The Magellanic Clouds Are Very Rare in the IllustrisTNG Simulations
Kroupa, Pavel; Haslbauer, Moritz; Banik, Indranil +2 more
The Large and Small Magellanic Clouds (LMC and SMC) form the closest interacting galactic system to the Milky Way, therewith providing a laboratory to test cosmological models in the local Universe. We quantify the likelihood for the Magellanic Clouds (MCs) to be observed within the
Studying the Properties of Spacetime with an Improved Dynamical Model of the Inner Solar System
Pavlov, Dmitry; Dolgakov, Ivan
Physical properties of the Sun (orientation of rotation axis, oblateness coefficient
Modeling the TESS Light Curve of Ap Si Star MX TrA
Pakhomov, Yury; Potravnov, Ilya; Romanovskaya, Anna +1 more
The TESS light curve of the silicon Ap star MX TrA was modeled using the observational surface distribution of silicon, iron, helium, and chromium obtained previously with the Doppler Imaging technique. The theoretical light curve was calculated using a grid of synthetic fluxes from line-by-line stellar atmosphere models with individual chemical a…
On the Nature of the Radio Calibrator and Gamma-Ray Emitting NLS1 Galaxy 3C 286 and Its Multiwavelength Variability
Komossa, S.; Grupe, D.; Kraus, A. +1 more
The quasar 3C 286, a well-known calibrator source in radio astronomy, was found to exhibit exceptional multiwavelength properties. Its rich and complex optical emission-line spectrum revealed its narrow-line Seyfert 1 (NLS1) nature. Given its strong radio emission, this makes 3C 286 one of the radio-loudest NLS1 galaxies known to date. 3C 286 is a…
Scientific Highlights of the AGILE Gamma-ray Mission
Tavani, Marco; Pittori, Carlotta; Vercellone, Stefano
The
The Changes in Multiscale Solar Wind Fluctuations on the Path from the Sun to Earth
Volodin, Igor D.; Riazantseva, Maria O.; Rakhmanova, Liudmila S. +2 more
This paper is devoted to the analysis of fluctuations in the solar wind plasma and interplanetary magnetic field parameters observed by Solar Orbiter and WIND spacecraft at different scales ranging from ~103 to 107 km. We consider two long data intervals where the distances between the spacecraft are 0.1 and 0.5 AU, respectiv…
X-ray Properties of Two Complementary Samples of Intermediate Seyfert Galaxies
Berton, Marco; Dalla Barba, Benedetta; Foschini, Luigi +2 more
We present the X-ray spectral analysis of two complementary sets of intermediate Seyfert galaxies (ISs). Analyzing X-ray data, we estimate the hydrogen abundance NH and test its connection with the [O III] luminosity acquired from optical observations. The results confirm the conclusions drawn in a previous study concerning the lack of a direct co…
Study of Nonlinear Evolution of Spacetime Fluctuations in Quantum Gravity Inflation for Deriving Primordial Spectrum
Hamada, Ken-ji
We study the evolution of quantum fluctuations of gravity around an inflationary solution in renormalizable quantum gravity, in which the initial scalar-fluctuation dominance is shown by the background-free nature expressed by a special conformal invariance. Inflation ignites at the Planck scale and continues until spacetime phase transition occur…
Further Study of the Relationship between Transient Effects in Energetic Proton and Cosmic Ray Fluxes Induced by Coronal Mass Ejections
Maričić, Darije; Savić, Mihailo; Veselinović, Nikola +4 more
The study and better understanding of energetic transient phenomena caused by disturbances occurring on our Sun are of great importance, primarily due to the potential negative effects those events can have on Earth's environment. Here, we present the continuation of our previous work on understanding the connection between disturbances in the flu…