Search Publications
Dissecting the Quadruple Binary Hyad vA 351 Masses for Three M Dwarfs and a White Dwarf
Torres, Guillermo; Latham, David W.; Skiff, Brian A. +8 more
We extend results first announced by Franz et al., that identified vA 351 = H346 in the Hyades as a multiple star system containing a white dwarf. With Hubble Space Telescope Fine Guidance Sensor fringe tracking and scanning, and more recent speckle observations, all spanning 20.7 years, we establish a parallax, relative orbit, and mass fraction f…
The Einstein Ring GAL-CLUS-022058s: a Lensed Ultrabright Submillimeter Galaxy at z = 1.4796
Rebolo, R.; Dannerbauer, H.; Díaz-Sánchez, A. +2 more
We report an ultrabright lensed submillimeter galaxy at zspec = 1.4796, identified as a result of a full-sky cross-correlation of the AllWISE and Planck compact source catalogs aimed at searching for bright submillimeter galaxies at z ~ 1.5-2.8. Atacama Pathfinder Experiment (APEX)/LABOCA observations of the candidate galaxy reveal a so…
Unveiling the nature of clusters in the Cygnus region. I. The embedded cluster DB2001-22
Molina Lera, J. A.; Baume, G.; Gamen, R. +2 more
The Cygnus region harbours a vast diversity of rich stellar complexes. Hence, it is ideal for studying recently formed stellar clusters, and investigate how the feedback effect and radiation emitted by its massive stars modifies the interstellar medium giving place to induced star forming processes. This is the case of the small and poorly studied…
BGLS-based method of estimating the rotational periods of asteroids
Ren, Yan-Qiong; Lu, Xiao-Ping; Liang, Yong
As the asteroid rotational period is important to the study of the properties of asteroids (e.g., super-fast rotators have structures owing an internal cohesion (rather than being rubble piles bounded by gravity only) so as not to fly apart), constructing an effective and fast method used to search the period attracts much researchers' attention. …
A thermophysical and dynamical study of the Hildas, (1162) Larissa, and (1911) Schubart
Marshall, J. P.; Müller, T. G.; Drass, H. +3 more
The Hilda asteroids are among the least studied populations in the asteroid belt, despite their potential importance as markers of Jupiter's migration in the early Solar system. We present new mid-infrared observations of two notable Hildas, (1162) Larissa, and (1911) Schubart, obtained using the Faint Object infraRed CAmera for the SOFIA Telescop…
An appraisal of crustal deformation of the East Coprates Planum, Mars
Dasgupta, Dipayan; Baul, Shankhadeep
Terrestrial planets in the Solar System have been impacted by meteorites from the very beginning of their existence. Mars is a planet that preserves features of tectonic deformation as well as impact-related deformation. East Coprates Planum (ECP) is an area situated on the equatorial region located just on the south of the dichotomy boundary of M…
Earth's Magnetotail as the Reservoir of Accelerated Single and Multicharged Oxygen Ions Replenishing Radiation Belts
Malova, Helmi V.; Zelenyi, Lev M.; Panasyuk, Mikhail I. +4 more
Acceleration of single and multicharged oxygen ions in the perturbed Earth's magnetotail is investigated as the possible source of energetic heavy ions in the ring current. The numerical model is developed that allows evaluating the acceleration of oxygen ions O+ O+8 in two possible scenarios of characteristic perturbations: …
Ti I lines at 2.2 µm as probes of the cooler regions of sunspots
Solanki, S. K.; Castellanos Durán, J. S.; Tiwari, S. K. +1 more
Context. The sunspot umbra harbours the coolest plasma on the solar surface due to the presence of strong magnetic fields. The atomic lines that are routinely used to observe the photosphere have weak signals in the umbra and are often swamped by molecular lines. This makes it harder to infer the properties of the umbra, especially in the darkest …
A Suzaku study of the low mass X-ray binary Aquila X-1 in the different states
Abdelbar, Ahmed M.; Beheary, M. M.; Abdelfatah, Ahmed S. +1 more
We present a Suzaku X-ray study for the neutron star low mass X-ray binary Aquila X-1. The observations of the system carried out during three times in 2011 from October 18 to October 24, where the repeated X-ray transient Aquila X-1 was in the rising phase of the outburst. During this period the source was successfully detected in its different s…
Breaks in the X-Ray Spectra of High-redshift Blazars and the Intervening Medium
Gaur, Haritma; Pandey, Ashwani; Mohan, Prashanth
Flat-spectrum radio quasars (FSRQs) are a subclass of blazars characterized by prominent optical emission lines and a collimated large-scale jet along the observer's line of sight. An X-ray spectral flattening has been reported in FSRQs (at relatively high redshifts) that is attributable either to absorption from gas along the line of sight or to …