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Humps on the Profiles of the Radial-Velocity Distribution and the Age of the Galactic Bar
Melnik, A. M.; Podzolkova, E. N.
We studied the model of the Galaxy with a bar which reproduces well the distributions of the observed radial, VR, and azimuthal, VT, velocities derived from the Gaia DR3 data along the Galactocentric distance R. The model profiles of the distributions of the velocity VR demonstrate a periodic increase and the forma…
Understanding the unusual life of the Cartwheel galaxy using stellar populations
Wolter, A.; Ditrani, F. R.; Longhetti, M. +1 more
Collisional ring galaxies (RiGs) are the result of the impact between two galaxies, with one of them passing close to the centre of the other, piercing its gaseous and stellar disc. In this framework, the impact generates a shock wave front that propagates within the disc of the target galaxy soon after the encounter, producing a characteristic ex…
The variable radio jet of the accreting neutron star the Rapid Burster
Degenaar, N.; Maccarone, T.; Miller-Jones, J. C. A. +5 more
The Rapid Burster is a unique neutron star low-mass X-ray binary system, showing both thermonuclear v-I and accretion-driven Type-II X-ray bursts. Recent studies have demonstrated how coordinated observations of X-ray and radio variability can constrain jet properties of accreting neutron stars - particularly when the X-ray variability is dominate…
TESS discovery of two super-Earths orbiting the M-dwarf stars TOI-6002 and TOI-5713 near the radius valley
Narita, N.; Palle, E.; Kaltenegger, L. +45 more
We present the validation of two TESS super-Earth candidates transiting the mid-M dwarfs TOI-6002 and TOI-5713 every 10.90 and 10.44 days, respectively. The first star (TOI-6002) is located 32.038 ± 0.019 pc away, with a radius of 0.2409‑0.0065+0.0066 R⊙, a mass of 0.2105‑0.0048+0.0049 M⊙…
Electron moments derived from the Mercury Electron Analyzer during the cruise phase of BepiColombo
André, N.; Fedorov, A.; Sauvaud, J. -A. +20 more
Aims: We derive electron density and temperature from observations obtained by the Mercury Electron Analyzer on board Mio during the cruise phase of BepiColombo while the spacecraft is in a stacked configuration.
Methods: In order to remove the secondary electron emission contribution, we first fit the core electron population of the sol…
Very long baseline interferometry detection of nearby (<100 pc) young stars. Pilot observations
Loinard, Laurent; Launhardt, Ralf; Dzib, Sergio A. +1 more
To increase the number of sources with very long baseline interferometry (VLBI) astrometry available for comparison with the Gaia results, we have observed 31 young stars with recently reported radio emission. These stars are all in the Gaia DR3 catalog and were suggested, on the basis of conventional interferometry observations, to be nonthermal …
Processing of hydrocarbon dust in star-forming galaxies revealed with AKARI
Oyabu, Shinki; Kaneda, Hidehiro; Murata, Katsuhiro L. +5 more
Hydrocarbon dust is one of the dominant components of interstellar dust, which mainly consists of polycyclic aromatic hydrocarbons and aliphatic hydrocarbons. While hydrocarbon dust is thought to be processed in interstellar radiation fields or shocks, detailed processing mechanisms are not completely understood yet. We investigate the processing …
Two black widow pulsars in the optical and X-rays
Zharikov, S. V.; Karpova, A. V.; Shibanov, Yu. A. +5 more
Context. Two millisecond pulsars, PSR J1513‑2550 and PSR J2017‑1614, with spin periods of about 2.1 and 2.3 ms were recently discovered in the radio and γ-rays and classified as black widow pulsars in tight binary stellar systems with orbital periods of about 4.3 and 2.3 h. Aims. Our goals are to reveal the fundamental parameters of both systems a…
Plasma Observations in the Distant Magnetotail During Intervals of Northward IMF
Milan, S. E.; Mooney, M. K.; Bower, G. E.
We examine a 6-day traversal of the magnetotail by the ARTEMIS satellites during an interval of prolonged northward IMF. The electrostatic analyzer (ESA) onboard the ARTEMIS spacecraft measures high ion and electron fluxes at approximately 60 RE downtail in regions of the magnetotail which would normally be the magnetotail lobe, contain…
Modeling the interstellar dust detections by DESTINY+
Kimura, Hiroshi; Trieloff, Mario; Krüger, Harald +11 more
The DESTINY