Search Publications
Tectonic evolution of Juventae Chasma, Mars, and the deformational and depositional structural attributes of the four major light-toned rock exposures therein
Sarkar, Ranjan; Edgett, Kenneth S.; Singh, Pragya +2 more
Juventae Chasma, a canyon peripheral to the Valles Marineris trough system, is the product of a unique merger of a Martian chaotic terrain depression and an extensional (tectonic) chasm. The chaotic terrain portion is set along a NNE-SSW axis, while a linear trough (the chasm component) is present along a WNW-ESE axis. Within the chasm are four di…
Empirical method of proper element calculation and identification of asteroid families
Vinogradova, T. A.
A search for asteroid families was carried out with the use of a proper element set comprising 649 050 asteroid orbits. Proper elements were calculated by the empirical method. This method uses distributions of orbital elements to calculate secular perturbations. There are two types of secular perturbations: the classical perturbations and the Lid…
The Plasma β Evolution through the Solar Corona during Solar Cycles 23 and 24
Dal Lago, Alisson; Vieira, Luis E. A.; Palacios, Judith +1 more
The plasma β is important in the investigation of interchanging roles of plasma and magnetic pressure in the solar atmosphere. It can help to describe features over the photosphere and their changes at different heights. The goal of this paper is to obtain the plasma β variations through the solar corona during solar cycles 23 and 24. The plasma β…
A cold stellar stream in Pegasus
Perottoni, Hélio D.; Rocha-Pinto, Helio J.; Newberg, Heidi Jo +3 more
We report the serendipitous discovery of a stellar stream in the constellation Pegasus in the south Galactic hemisphere. The stellar stream was detected using the SDSS Data Release 14 by means of a matched filter in the colour-magnitude diagram that is optimized for a stellar population that is 8 Gyr old with [Fe/H] = -0.46 dex, and located at hel…
The Young Massive Star Cluster Westerlund 2 Observed with MUSE. II. MUSEpack—A Python Package to Analyze the Kinematics of Young Star Clusters
Grebel, Eva K.; Sabbi, Elena; Nota, Antonella +5 more
We mapped the Galactic young massive star cluster Westerlund 2 with the integral field spectrograph MUSE (spatial resolution: 0.2 arcsec px-1, spectral resolution: Δλ = 1.25 Å, wavelength range: 4600-9350 Å) mounted on the Very Large Telescope. We present the fully reduced data set and introduce our new Python package “MUSEpack,” which …
A low-mass triple system with a wide L/T transition brown dwarf component: NLTT 51469AB/SDSS 2131-0119
Rebolo, R.; Béjar, V. J. S.; Zapatero Osorio, M. R. +6 more
We demonstrate that the previously identified L/T transition brown dwarf SDSS J213154.43-011939.3 (SDSS 2131-0119) is a widely separated (82{^''.}3, ∼3830 au) common proper motion companion to the low-mass star NLTT 51469, which we reveal to be a close binary itself, separated by 0{^''.}64 ± 0{^''.}01 (∼30 au). We …
A radio structure resolved at the deca-parsec scale in the radio-quiet quasar PDS 456 with an extremely powerful X-ray outflow
Zhang, Zhongli; Paragi, Zsolt; Yang, Jun +5 more
Active galactic nuclei (AGNs) accreting at rates close to the Eddington limit can host radiatively driven mildly relativistic outflows. Some of these X-ray absorbing but powerful outflows can produce strong shocks, resulting in a significant non-thermal emission. This outflow-driven radio emission might be detectable in the radio-quiet quasar PDS …
Optical integral field spectroscopy of intermediate redshift infrared bright galaxies
Magdis, G. E.; Farrah, D.; Rigopoulou, D. +10 more
The extreme infrared (IR) luminosity of local luminous and ultraluminous IR galaxies (U/LIRGs; 11 < log L_IR / L_⊙ < 12 and log L_IR / L_⊙ > 12, respectively) is mainly powered by star formation processes triggered by mergers or interactions. While U/LIRGs are rare locally, at z > 1, they become more common, dominate the star formation…
Nature of blackbody stars
Serenelli, Aldo; Rohrmann, René D.; Fukugita, Masataka
A selection of 17 stars in the Sloan Digital Sky Survey, previously identified as DC-class white dwarfs (WDs), has been reported to show spectra very close to blackbody radiation in the wavelength range from ultraviolet to infrared. Because of the absence of lines and other details in their spectra, the surface gravity of these objects has previou…
ISPY - NaCo Imaging Survey for Planets around Young stars. A young companion candidate embedded in the R CrA cloud
Quanz, S. P.; Quirrenbach, A.; Henning, T. +13 more
Context. Within the NaCo-ISPY exoplanet imaging program, we aim at detecting and characterizing the population of low-mass companions at wide separations (≳10 AU), focusing in particular on young stars either hosting a known protoplanetary disk or a debris disk.
Aims: R CrA is one of the youngest (1-3 Myr) and most promising objects in our sa…