Search Publications
The X-ray spectral-timing contribution of the stellar wind in the hard state of Cyg X-1
Wilms, J.; Uttley, P.; De Marco, B. +6 more
The clumpy stellar wind from the companion star in high-mass X-ray binaries causes variable, partial absorption of the emission from the X-ray source. We studied XMM-Newton observations from a 7.22 d long monitoring campaign, in order to constrain the effects of the stellar wind on the short-time-scale X-ray spectral-timing properties of Cygnus X-…
Central Black Hole Mass in the Distant Tidal Disruption Event Candidate of Swift J2058.4+0516
Zhang, XueGuang
In this article, the central black hole (BH) mass in the distant tidal disruption event (TDE) of Swift J2058.4+0516, the second candidate of relativistic jet birth related to a TDE, is estimated. Swift J2058.4+0516 has quite different BH masses estimated through different indirect methods in the literature. Therefore, it is necessary and interesti…
Large Impact of the Mg II h and k Incident Radiation Change on Results of Radiative Transfer Models and the Importance of Dynamics
Heinzel, Petr; Gunár, Stanislav; Koza, Július +1 more
We demonstrate that changes in the incident radiation in Mg II h and k lines have a significant impact on the results of radiative transfer modeling of prominence-like plasmas. To uncover the extent of this impact and allow easy comparison, here we study two cases, one representing the minimum of the solar activity and the other corresponding to t…
Rotating Solar Models in Agreement with Helioseismic Results and Updated Neutrino Fluxes
Yang, Wuming
Standard solar models (SSMs) constructed in accordance with old solar abundances are in reasonable agreement with seismically inferred results, but SSMs with new low-metal abundances disagree with the seismically inferred results. The constraints of neutrino fluxes on solar models exist in parallel with those of helioseismic results. The solar neu…
Demographics of the M-star Multiple Population in the Orion Nebula Cluster
Reiter, Megan; Meyer, Michael R.; De Furio, Matthew +4 more
We present updated results constraining multiplicity demographics for the stellar population of the Orion Nebula Cluster (ONC, a high-mass, high-density star-forming region), across primary masses 0.08-0.7 M ⊙. Our study utilizes archival Hubble Space Telescope data obtained with the Advanced Camera for Surveys using multiple filters (G…
Star-forming and gas-rich brightest cluster galaxies at z ∼ 0.4 in the Kilo-Degree Survey
Castignani, G.; Moscardini, L.; Radovich, M. +9 more
Brightest cluster galaxies (BCGs) are typically massive ellipticals at the centers of clusters. They are believed to experience strong environmental processing, and their mass assembly and star formation history are still debated. We have selected three star-forming BCGs in the equatorial field of the Kilo-Degree Survey (KiDS). They are KiDS 0920 …
The transport of galactic cosmic rays in heliosphere: The HELMOD model compared with other commonly employed solar modulation models
Gervasi, M.; Rancoita, P. G.; Boschini, M. J. +2 more
HELMOD model allows one to describe how solar modulation affects the propagation of galactic cosmic rays (GCRs) through the heliosphere by solving the Parker transport equation. HELMOD provides modulated spectra for protons and nuclei during high and low solar activity periods, in the inner and outer heliosphere, at Earth location and outside the …
Photochemistry of HCl in the martian atmosphere
Krasnopolsky, Vladimir A.
The recent discovery of HCl in the martian atmosphere using the ExoMars Trace Gas Orbiter (Korablev et al., 2021, Sci. Adv. 7, eabe4386) during a global dust storm indicates a correlation between the HCl appearance and dust. Here this idea is studied using one-dimensional photochemical modeling on two summer midlatitude sites in the aphelion and p…
Galactic and stellar perturbations of long-period comet motion. Practical considerations
Dybczyński, Piotr A.; Breiter, Sławomir
Context. Thanks to our expanding knowledge of the Galactic and stellar neighborhood of the Solar System, modern long-period comet motion studies must take into account both stellar perturbations and the overall Galactic potential.
Aims: Our aim is to propose algorithms and methods that aid in performing numerical integrations of equations of …
A Deep Investigation of Two Poorly Studied Open Clusters Haffner 22 and Melotte 71 in the Gaia era
Bisht, D.; Rangwal, Geeta; Yadav, R. K. S. +4 more
This paper presents a deep investigation of two open clusters, Haffner 22 and Melotte 71, using astrometric and photometric data from Gaia EDR3. We identified 382 and 597 most probable cluster members with membership probability higher than 50%. Mean proper motions in R.A. and decl. are estimated as (-1.631 ± 0.009, 2.889 ± 0.008) and (-2.398 ± 0.…