Search Publications
Star-forming regions at the periphery of the supershell surrounding the Cyg OB1 association - II. ISM kinematics and YSOs in the star cluster vdB 130 region
Wiebe, D. S.; Moiseev, A. V.; Lozinskaya, T. A. +4 more
We present an observational study of small-scale feedback processes operating in the star-forming region located in the wall of the expanding supershell around the Cyg OB1 association. The interstellar gas and dust content and pre-stellar populations in the vicinity of the open star cluster vdB 130 are analysed based on new optical and IR observat…
Clues on Arp 142: The spiral-elliptical merger
Mendes de Oliveira, Claudia; Firpo, Verónica; Torres-Flores, Sergio +3 more
Nearby merging pairs are unique laboratories in which one can study the gravitational effects on the individual interacting components. In this manuscript, we report the characterization of selected H II regions along the peculiar galaxy NGC 2936, member of the galaxy pair Arp 142, an E+S interaction, known as `The Penguin'. Using Gemini South spe…
Long-standing Small-scale Reconnection Processes at Saturn Revealed by Cassini
Coates, A. J.; Krupp, N.; Dougherty, M. K. +12 more
The internal mass source from the icy moon Enceladus in Saturn’s rapidly rotating magnetosphere drives electromagnetic dynamics in multiple spatial and temporal scales. The distribution and circulation of the internal plasma and associated energy are thus crucial in understanding Saturn’s magnetospheric environment. Magnetic reconnection is one of…
Comet C/2018 V1 (Machholz-Fujikawa-Iwamoto): dislodged from the Oort Cloud or coming from interstellar space?
de la Fuente Marcos, R.; de la Fuente Marcos, C.
The chance discovery of the first interstellar minor body, 1I/2017 U1 (`Oumuamua), indicates that we may have been visited by such objects in the past and that these events may repeat in the future. Unfortunately, minor bodies following nearly parabolic or hyperbolic paths tend to receive little attention: over 3/4 of those known have data-arcs sh…
Testing the deltaic origin of fan deposits at Bradbury Crater, Mars
Mustard, John F.; Goudge, Timothy A.; Milliken, Ralph E. +1 more
The stratigraphic architectures of three fan-shaped deposits at Bradbury crater, Mars were investigated to test the hypothesis that the deposits were formed in standing bodies of water. Quantitative stratigraphic methods were applied to the northernmost deposit, which displays meter-thick layering. Planes fit to exposed strata display a constant d…
Interferometric observations of SiO thermal emission in the inner wind of M-type AGB stars IK Tauri and IRC+10011
Alcolea, J.; Bujarrabal, V.; Castro-Carrizo, A. +2 more
Context. Asymptotic giant branch (AGB) stars go through a process of strong mass loss that involves pulsations of the atmosphere, which extends to a region in which the conditions are adequate for dust grains to form. Radiation pressure acts on these grains which, coupled to the gas, drive a massive outflow. The details of this process are not cle…
The nonlinear X‑ray/ultraviolet relation in active galactic nuclei: Contribution of instrumental effects on the X‑ray variability
Lusso, E.
We have recently demonstrated that the nonlinear relation between ultraviolet and X‑ray luminosity in quasars is very tight (with an intrinsic dispersion of ∼0.2 dex), once contaminants (e.g., dust reddening, X‑ray absorption), variability, and differences in the active galactic nuclei physical properties are taken into account. This relation has …
Classification of low-luminosity stellar X-ray sources in the field of the Draco dwarf spheroidal galaxy
Stelzer, Beate; Sasaki, Manami; Saeedi, Sara +1 more
Aims: A previous study of the X-ray luminosity function of the X-ray sources in the Draco dwarf spheroidal (dSph) galaxy field indicates the presence of a population of unknown X-ray sources in the soft energy range of 0.5-2 keV. In 2015, there were twenty-six further deep XMM-Newton observations of Draco dSph, providing an opportunity for a …
Revised and updated catalogue of the First Byurakan Survey of Late-Type Stars: second edition
Gigoyan, K. S.; Kostandyan, G. R.; Mickaelian, A. M.
A total of 18 lists of the First Byurakan Survey of Late-Type Stars (FBS LTS) were published between 1990 and 2016. The stars were found on FBS low-dispersion spectroscopic plates. A systematic search and selection were carried out on a surface of ∼16 000 deg2 on almost the whole area of the FBS. As a result, the 'Revised and Updated Ca…
Comparison of neutral outgassing of comet 67P/Churyumov-Gerasimenko inbound and outbound beyond 3 AU from ROSINA/DFMS
Wurz, P.; Altwegg, K.; Berthelier, J. J. +16 more
Context. Pre-equinox measurements of comet 67P/Churyumov-Gerasimenko with the mass spectrometer ROSINA/DFMS on board the Rosetta spacecraft revealed a strongly heterogeneous coma. The abundances of major and various minor volatile species were found to depend on the latitude and longitude of the nadir point of the spacecraft. The observed time var…