Search Publications
Detection of the third innermost radiation belt on LEO CORONAS-Photon satellite around 2009 solar minimum
Phillips, Kenneth J. H.; Sylwester, Janusz; Dudnik, Oleksiy V. +2 more
We analyze variations of high energy charged particle populations filling various magnetospheric regions under, inside and outside of the Van Allen inner and outer electron radiation belts in May 2009. The study is based on the experimental data obtained from the STEP-F and the SphinX instruments placed close to each other aboard the low-Earth cir…
Cometary ions detected by the Cassini spacecraft 6.5 au downstream of Comet 153P/Ikeya-Zhang
Jones, G. H.; McComas, D. J.; Smith, E. J. +5 more
During March-April 2002, while between the orbits of Jupiter and Saturn, the Cassini spacecraft detected a significant enhancement in pickup proton flux. The most likely explanation for this enhancement was the addition of protons to the solar wind by the ionization of neutral hydrogen in the corona of comet 153P/Ikeya-Zhang. This comet passed rel…
A photometric study of V608 Cam: apparent period changes as a result of surface activity
Wolf, M.; Walter, F.; Šebek, F.
The VRI light curves were measured for the low-mass eclipsing binary V608 Cam as a part of our long-term observational project for studying of eclipsing binaries with a short orbital period. The TESS light curve solution in PHOEBE results to the detached configuration, where the temperature of the primary component was fixed to T1 = 530…
BD+47 378: An Eclipsing Binary Containing a δ Sct Pulsating Star
Han, Cheongho; Hong, Kyeongsoo; Rittipruk, Pakakaew +3 more
New high-resolution spectra of the eclipsing binary BD+47 378 were obtained on five nights between 2020 and 2021 with the Bohyunsan Observatory Echelle Spectrograph in Korea. We collected the TESS light curve of the system obtained from Sectors 17 to 18, which shows a flat bottom at the secondary eclipse, an O'Connell effect, and oscillation featu…
PSZ2 G091: A massive double cluster at z 0.822 observed by the NIKA2 camera
Berta, S.; Aussel, H.; Adam, R. +48 more
PSZ2 G091.83+26.11 is a massive galaxy cluster with M500 = 7:43 × 1014M⊙ at z = 0:822. This object exhibits a complex morphology with a clear bimodality observed in X-rays. However, it was detected and analysed in the Planck sample as a single, spherical cluster following a universal profile [1]. This model can lea…
The cosmic environment overtakes the local density in shaping galaxy star formation
Fang, Min; Bian, Fuyan; Huang, Jia-Sheng +11 more
The gas supply from the cosmic web is the key to sustain star formation in galaxies. It remains to be explored how the cosmic large-scale structure (LSS) effects on galaxy evolution at given local environments. We examine galaxy-specific star formation rate as a function of local density in a LSS at z = 0.735 in the Extended Chandra Deep Field Sou…
Comparison between probability density functions of vertical electric current in solar active regions based on HMI/SDO and SOT/Hinode data
Zimovets, Ivan; Nechaeva, Alena; Sharykin, Ivan
Studying electric currents in solar active regions (AR) is an essential step in understanding solar activity in general and solar flares in particular. In this paper, we compare probability density functions of vertical electric current PDF(|jz|) in several active regions, using HMI/SDO and SOT/Hinode photospheric magnetic field data. We have esta…
Physical conditions and chemical abundances of the variable planetary nebula IC 4997
Parthasarathy, M.; Danehkar, A.
The planetary nebula (PN) IC 4997 is one of a few rapidly evolving objects with variable brightness and nebular emission around a hydrogen-deficient star. In this study, we have determined the physical conditions and chemical abundances of this object using the collisionally excited lines (CELs) and optical recombination lines (ORLs) measured from…
Astrometry of variable compact radio sources: a search for Galactic black hole X-ray binaries
Maccarone, T. J.; Heinke, C. O.; Miller-Jones, J. C. A. +8 more
We use the Very Long Baseline Array to conduct high precision astrometry of a sample of 33 compact, flat spectrum, variable radio sources in the direction of the Galactic plane (Becker et al. 2010). Although Becker et al. (2010) ruled out a few potential scenarios for the origin of the radio emission, the study could not rule out that these source…
The Energetics of the Central Engine in the Powerful Quasar 3C 298
Schneider, Donald P.; Zeimann, Gregory R.; Hill, Gary J. +3 more
The compact steep-spectrum radio source 3C 298 (redshift of 1.44) has the largest 178 MHz luminosity in the Third Cambridge Revised Catalogue (3CR); its radio lobes are among the most luminous in the universe. The plasma state of the radio lobes is modeled with the aid of interferometric radio observations (in particular, the new Low Frequency Arr…