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A Sparkler in the Fireworks Galaxy: Discovery of an Ultraluminous X-Ray Transient with a Strong Oxygen Line in NGC 6946
Soria, Roberto; Wang, Junfeng; Wang, Chen
We discovered and studied an ultraluminous X-ray source (CXOU J203451.1+601043) that appeared in the spiral galaxy NGC 6946 at some point between 2008 February and 2012 May and has remained at luminosities ≈2-4 × 1039 erg s-1 in all observations since then. Our spectral modeling shows that the source is generally soft but wit…
Multiwavelength Modeling of the SED of Nova V339 Del: Stopping the Wind and Long-lasting Super-Eddington Luminosity with Dust Emission
Skopal, Augustin
During the classical nova outburst, the radiation generated by the nuclear burning of hydrogen in the surface layer of a white dwarf (WD) is reprocessed by the outer material into different forms at softer energies, whose distribution in the spectrum depends on the nova age. Using the method of multiwavelength modeling the spectral energy distribu…
Retrieval of Chemical Abundances in Titan's Upper Atmosphere From Cassini UVIS Observations With Pointing Motion
Gao, Peter; Fan, Siteng; Li, Cheng +3 more
Cassini/Ultraviolet Imaging Spectrograph (UVIS) Far-UV observations of stellar occultations at Titan are well suited for probing its atmospheric composition and structure. However, due to instrument pointing motion, only 5 out of tens of observations have been analyzed. We present an innovative retrieval method that corrects for the effect of poin…
ATLASGAL-selected massive clumps in the inner Galaxy. VII. Characterisation of mid-J CO emission
König, C.; Menten, K. M.; Csengeri, T. +7 more
Context. High-mass stars are formed within massive molecular clumps, where a large number of stars form close together. The evolution of the clumps with different masses and luminosities is mainly regulated by their high-mass stellar content and the formation of such objects is still not well understood.
Aims: In this work, we characterise th…
Parameters of the Link between the Optical and Radio Frames from Gaia DR2 Data and VLBI Measurements
Bobylev, V. V.
Based on published data, we have assembled a sample of 88 radio stars for which there are both trigonometric parallax and proper motion measurements in the Gaia DR2 catalogue and VLBI measurements. A new estimate of the systematic offset between the optical and radio frames has been obtained by analyzing the Gaia-VLBI trigonometric parallax differ…
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 …