Search Publications
Spectral study of the planetary nebula NGC 2452
Ali, A.; Snaid, S.; Alruhaili, A.
We provide a detailed study for the Galactic planetary nebula (PN) NGC 2452, which has long been suspected to be a member of the Galactic cluster NGC 2453. The present study uses integral field unit (IFU) spectroscopic observations of the PN to explore its physical conditions, chemical abundances, kinematical characteristics, and morphological fea…
CMEs evolve in the interplanetary medium to double their predicted geo-effectiveness
Poedts, Stefaan; Mishra, Wageesh; Soni, Shirsh Lata +4 more
Context. We explore the impact of interactions between coronal mass ejections (CMEs) - known as CME-CME interactions - on Earth using remote-sensing and in situ observations and estimate the amplification of the geo-effectiveness of the individual CMEs by a factor of ∼2 due to CME-CME interactions.
Aims: We present 3D reconstructions of inter…
Characterization of the Early Dynamics of Solar Coronal Bright Fronts
Stepanyuk, Oleg; Kozarev, Kamen; Nedal, Mohamed +2 more
We present a comprehensive characterization of 26 Coronal Mass Ejection (CME)-driven compressive waves known as Coronal Bright Fronts (CBFs) observed in the low solar corona between 2010 and 2017. These CBFs have been found to be associated with Solar Energetic Particle (SEP) events near Earth, indicating their importance in understanding space we…
Simultaneous Chandra and HST observations of the quiescent neutron star low-mass X-ray binaries in 47 Tucanae
van den Berg, M.; Heinke, C. O.; Cohn, H. N. +6 more
We present simultaneous Chandra X-ray Observatory and Hubble Space Telescope observations of three certain (X5, X7, W37) and two likely (X4, W17) quiescent neutron star low-mass X-ray binaries (qLMXBs) in the globular cluster 47 Tuc. We study these systems in the X-ray, optical, and near-ultraviolet (NUV) using the simultaneous data and additional…
Correction to: Fundamental parameters for 45 open clusters with Gaia DR2, an improved extinction correction and a metallicity gradient prior
Cantat-Gaudin, T.; Moitinho, A.; Paunzen, E. +4 more
On the Instrumental Discrepancies in Lyman-Alpha Observations of Solar Flares
Dammasch, Ingolf E.; Milligan, Ryan O.; Greatorex, Harry J.
Despite the energetic significance of Lyman-alpha (Ly
Mineral detection based on hyperspectral remote sensing imagery on Mars: From detection methods to fine mapping
Zhang, Liangpei; Ke, Tian; Zhong, Yanfei +2 more
Hyperspectral remote sensing is a commonly used technical means for mineral detection on the Martian surface, which has important implications for the study of Martian geological evolution and the study for potential biological signatures. The increasing volume of Martian remote sensing data and complex issues such as the intimate mixture of Marti…
131 and 304 Å Emission Variability Increases Hours Prior to Solar Flare Onset
Mason, E. I.; Uritsky, Vadim M.; Kniezewski, Kara L. +1 more
Thermal changes in coronal loops are well studied, both in quiescent active regions and in flaring scenarios. However, relatively little attention has been paid to loop emission in the hours before the onset of a solar flare; here, we present the findings of a study of over 50 off-limb flares of Geostationary Operational Environmental Satellite cl…
The counter-rotating stellar core of NGC 4494
Morelli, L.; Corsini, E. M.; Pizzella, A. +2 more
Context. Kinematically decoupled cores (KDCs) are often found in the centers of early-type galaxies. Aims. We aim to investigate the kinematics, structure, and stellar populations of the KDC residing in the early-type galaxy NGC 4494 to understand its formation. Methods. We used long-slit spectroscopic data obtained with the FORS2 instrument on th…
Inferring the dust emission at submillimeter and millimeter wavelengths using neural networks
Ristorcelli, I.; Ysard, N.; Noriega-Crespo, A. +3 more
Context. The Planck mission provided all-sky dust emission maps in the submillimeter (submm) to millimeter (mm) range at an angular resolution of 5'. In addition, some specific sources can be observed at long wavelengths and higher resolution using ground-based telescopes. These observations are limited to small scales and are sometimes not delive…