Search Publications
On the Rigidity Spectrum of Cosmic-Ray Variations within Propagating Interplanetary Disturbances: Neutron Monitor and SOHO/EPHIN Observations at ∼1-10 GV
Vourlidas, Angelos; Heber, Bernd; Papaioannou, Athanasios +9 more
The rigidity dependence of all Forbush decreases (FDs) recorded from 1995 to 2015 has been determined using neutron monitor (NM) and Solar and Heliospheric Observatory (SOHO) (EPHIN) spacecraft data, covering the energy (rigidity) range from ∼433 MeV (1 GV) to 9.10 GeV (10 GV). We analyzed a total of 421 events and determined the spectrum in rigid…
ATOMS: ALMA Three-millimeter Observations of Massive Star-forming regions-VI. On the formation of the 'L' type filament in G286.21+0.17
Kim, Kee-Tae; Lee, Chang Won; Liu, Hong-Li +16 more
Filaments play an important role in star formation, but the formation process of filaments themselves is still unclear. The high-mass star-forming clump G286.21+0.17 (G286 for short) that contains an 'L' type filament was thought to undergo global collapse. Our high-resolution ALMA band 3 observations resolve the gas kinematics of G286 and reveal …
Fast flaring observed from XMMU J053108.3-690923 by eROSITA: a supergiant fast X-ray transient in the Large Magellanic Cloud
Haberl, F.; Ducci, L.; Vasilopoulos, G. +3 more
Context. Supergiant fast X-ray transients (SFXTs) are a peculiar class of supergiant high-mass X-ray binary (HMXB) systems characterised by extreme variability in the X-ray domain. In current models, this is mainly attributed to the clumpy nature of the stellar wind coupled with gating mechanisms involving the spin and magnetic field of the neutro…
The diffuse interstellar band around 8620 Å. I. Methods and application to the GIBS data set
Schultheis, M.; Recio-Blanco, A.; de Laverny, P. +6 more
Context. Diffuse interstellar bands (DIBs) are interstellar absorption features that widely exist in the optical and near-infrared wavelength range. DIBs play an important role in the lifecycle of the interstellar medium and can also be used to trace the Galactic structure.
Aims: We developed a set of procedures to automatically detect and me…
X-Ray Pulsar XTE J1858+034: Discovery of the Cyclotron Line and the Revised Optical Identification
Kretschmar, Peter; Doroshenko, Victor; Tsygankov, Sergey S. +7 more
We present the results of a detailed investigation of the poorly studied X-ray pulsar (XRP) XTE J1858+034 based on the data obtained with the NuSTAR observatory during the outburst of the source in 2019. The spectral analysis resulted in the discovery of a cyclotron absorption feature in the source spectrum at ∼48 keV in both the pulse phase-avera…
Colliding stellar wind modelling of the X-ray emission from WR 140
Zhekov, Svetozar A.
We modelled the Chandra and Rossi X-ray Timing Explorer X-ray spectra of the massive binary WR 140 in the framework of the standard colliding stellar wind (CSW) picture. Models with partial electron heating at the shock fronts are a better representation of the X-ray data than those with complete temperature equalization. Emission measure of the X…
Steady-state nucleosynthesis throughout the Galaxy
Wang, Wei; Martin, Pierrick; Diehl, Roland +6 more
The measurement and astrophysical interpretation of characteristic γ-ray lines from nucleosynthesis was one of the prominent science goals of the INTEGRAL mission and in particular its spectrometer SPI. Emission from 26Al and from 60Fe decay lines, due to their My decay times, originates from accumulated ejecta of nucleosynth…
The Dayside Ionopause of Mars: Solar Wind Interaction, Pressure Balance, and Comparisons With Venus
Gurnett, D. A.; Kopf, A. J.; Halekas, J. +5 more
Due to the lower ionospheric thermal pressure and existence of the crustal magnetism at Mars, the Martian ionopause is expected to behave differently from the ionopause at Venus. We study the solar wind interaction and pressure balance at the ionopause of Mars using both in situ and remote sounding measurements from the Mars Advanced Radar for Sub…
The Swan: Data-driven Inference of Stellar Surface Gravities for Cool Stars from Photometric Light Curves
Huber, Daniel; Ness, Melissa K.; Wheeler, Adam +1 more
Stellar light curves are well known to encode physical stellar properties. Precise, automated, and computationally inexpensive methods to derive physical parameters from light curves are needed to cope with the large influx of these data from space-based missions such as Kepler and TESS. Here we present a new methodology that we call "The Swan," a…
A synergy of the velocity gradients technique and the probability density functions for identifying gravitational collapse in self-absorbing media
Lazarian, A.; Hu, Yue
The velocity gradients technique (VGT) and the probability density functions (PDFs) of mass density are tools to study turbulence, magnetic fields, and self-gravity in molecular clouds. However, self-absorption can significantly make the observed intensity different from the column density structures. In this work, we study the effects of self-abs…