Search Publications
The composition and thermal properties of a cool core lacking a brightest cluster galaxy
Combes, Francoise; Su, Yuanyuan; Olivares, Valeria +3 more
We present a multiwavelength observation of a cool core that does not appear to be associated with any galaxy, in a nearby cluster, Abell 1142. Its X-ray surface brightness peak of ≲2 keV is cooler than the ambient intracluster gas of ≳3 keV, and is offset from its brightest cluster galaxy (BCG) by 80 kpc in projection, representing the largest kn…
The Origin of the Large Magellanic Cloud Globular Cluster NGC 2005
Piatti, Andrés E.; Hirai, Yutaka
The ancient Large Magellanic Cloud (LMC) globular cluster NGC 2005 has recently been reported to have an ex situ origin, thus, setting precedents that the LMC could have partially formed from smaller merged dwarf galaxies. We here provide additional arguments from which we conclude that is also fairly plausible an in situ origin of NGC 2005, based…
Astrometric observations of the main Saturnian satellites from 2004 to 2014 based on Gaia DR3
Zhang, H. Y.; Yan, D.; Qiao, R. C. +1 more
A total of 3169 astrometric positions of the seven main satellites of Saturn: Enceladus, Tethys, Dione, Rhea, Titan, Hyperion and Iapetus were obtained in the time span 2004-2014 from observations made with 1.56 m telescope at Sheshan station of Shanghai Observatory, CAS. We compared our observations to the theoretical positions retrieved from IMC…
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-…