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Centaurus A: Exploring the Nature of the Hard X-Ray/Soft Gamma-Ray Emission with INTEGRAL
Jourdain, E.; Roques, J. P.; Molina, M. +1 more
The question of the origin of the hard X-ray/soft gamma-ray emission in Centaurus A (Cen A) persists despite decades of observations. Results from X-ray instruments suggest a jet origin since the implied electron temperature (kT e ) would cause runaway pair production in the corona. In contrast, instruments sensitive to soft gamma rays…
Analysis of Geoeffective Impulsive Events on the Sun During the First Half of Solar Cycle 24
Wawrzaszek, Anna; Gil, Agnieszka; Modzelewska, Renata +4 more
A coronal mass ejection (CME) is an impulsive event that emerges rapidly from the Sun. We observed a quiet Sun without many spectacular episodes during the last decade. Although some fast halo and partial halo CMEs had taken place, among them was the backside CME on 23 July 2012. In this work, we verify the link between the variability of solar-wi…
A Census of the Most Luminous Stars. I. The Upper HR Diagram for the Large Magellanic Cloud
Humphreys, Roberta M.; Martin, John C.
Spectral classification and multiwavelength photometry for the most luminous stars in the LMC has greatly increased due to several recent surveys for both the hottest and coolest members. Combining data from these spectroscopic and photometric surveys, we have created catalogs based on their spectral classifications of the different groups: the lu…
Modelling simultaneous CoRoT and Spitzer light curves: the impact of bending waves in the inner disc
Nagel, E.; Bouvier, J.
We present a physical interpretation of the amplitude of light curves of young stellar objects (YSOs) simultaneously observed in the infrared with the Spitzer Space Telescope and in the optical with the CoRoT satellite. The modelled objects come from a sample of YSOs in the star forming region NGC 2264, and we focus on a subsample showing periodic…
The nearby astrometric-spectroscopic binary star Hip 68682
Wang, Xiaoli; Fu, Yanning; Chen, Yue +1 more
The nearby astrometric-spectroscopic binary star Hip 68682 has an orbital period of ∼ 9.88 yr. The dynamical state (component masses and kinematic parameters) of this system is redetermined by fitting all the observational data available to us, including the radial velocity data (RVD), the relative position data (RPD), and the Hipparcos Intermedia…
Unravelling the geological and geomorphological evolution of the Terra Cimmeria-Nepenthes Mensae transitional zone, Mars
García-Arnay, Ángel; Gutiérrez, Francisco
The Terra Cimmeria-Nepenthes Mensae Transitional Zone comprises two highly contrasting geologic-geomorphic domains bounded by the dichotomy escarpment in the equatorial region of Mars. This research provides insight into the geological and geomorphological evolution of the poorly explored NW Terra Cimmeria and SE Nepenthes Mensae. A detailed study…
RXCJ1111.6+4050 galaxy cluster: Observational evidence of a transitional fossil group
Böhringer, H.; Chon, G.; Barrena, R. +2 more
We present a detailed kinematical and dynamical study of the galaxy cluster RXCJ1111.6+4050 (RXCJ1111), at z = 0.0756 using 104 new spectroscopic redshifts of galaxies observed at the Telescopio Nazionale Galileo and SDSS DR16 public archive. Our analysis is performed in a multiwavelength context in order to study and compare mainly optical and X-…
Photometric and kinematic studies of open cluster NGC 1027
Sharma, Saurabh; Panwar, Neelam; Kumar, Brijesh +2 more
We present photometric and kinematic analyses of an intermediate-age open cluster NGC 1027 using
Spectral and timing analysis of BeXRB eRASSU J050810.4-660653 recently discovered in the Large Magellanic Cloud (LMC)
Tobrej, Mohammed; Rai, Binay; Ghising, Manoj +2 more
We have studied the Be/X-ray binary (BeXRB) pulsar eRASSU J050810.4-660653 recently discovered in the Large Magellanic Cloud (LMC). Timing and spectral features of the source have been discussed in detail using NuSTAR and XMM-Newton observations. Coherent pulsation of the source was detected at ~40.578 ± 0.001 s using NuSTAR observation. We analys…
Parameters of SU UMa and WZ Sge-Type Dwarf Novae in Quiescent State. I. FL Psc, TY Psc and V455 And
Shimansky, V. V.; Mitrofanova, A. A.; Dudnik, A. A. +2 more
We present the results of model analysis of the optical spectra of SU UMa and WZ Sge-type dwarf novae TY Psc, FL Psc, and V455 And. Spectroscopic observations were carried out at the SAO RAS 6-m BTA telescope in 2013. The selection criterion for the systems under study is their existence in a quiescent state with an optically thin accretion disk a…