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Mapping the coronal hydrogen temperature in view of the forthcoming coronagraph observations by Solar Orbiter
Spadaro, D.; Dolei, S.; Ventura, R.
Context. Synergistic visible light and ultraviolet coronagraphic observations are essential to investigate the link of the Sun to the inner heliosphere through the study of the dynamic properties of the solar wind.
Aims: We perform spectroscopic mapping of the outer solar corona to constitute a statistically significant database of neutral hy…
Mid-infrared dust in two nearby radio galaxies, NGC 1316 (Fornax A) and NGC 612 (PKS 0131-36)
Horellou, C.; Jarrett, T. H.; Winkler, H. +1 more
Context. Most radio galaxies are hosted by giant gas-poor ellipticals, but some contain significant amounts of dust, which is likely to be of external origin.
Aims: In order to characterize the mid-IR properties of two of the most nearby and brightest merger-remnant radio galaxies of the Southern hemisphere,
Investigation of the energy dependence of the orbital light curve in LS 5039
Zhang, S.; Kretschmar, P.; Kuulkers, E. +5 more
LS 5039 is so far the best-studied γ-ray binary system at multiwavelength energies. A time-resolved study of its spectral energy distribution (SED) shows that above 1 keV its power output is changing along its binary orbit as well as being a function of energy. To disentangle the energy dependence of the power output as a function of orbital phase…
Narrow-line-width UV Bursts in the Transition Region above Sunspots Observed by IRIS
Fu, Hui; Madjarska, Maria S.; Li, Bo +5 more
Various small-scale structures abound in the solar atmosphere above active regions, playing an important role in the dynamics and evolution therein. We report on a new class of small-scale transition region structures in active regions, characterized by strong emissions but extremely narrow Si IV line profiles as found in observations taken with t…
The Overlooked Role of Stellar Variability in the Extended Main Sequence of LMC Intermediate-age Clusters
Contreras Ramos, R.; Vivas, A. K.; Strader, J. +2 more
Intermediate-age star clusters in the Large Magellanic Cloud show extended main sequence turnoffs (MSTOs) that are not consistent with a canonical single stellar population. These broad turnoffs have been interpreted as evidence for extended star formation and/or stellar rotation. Since most of these studies use single frames per filter to do the …
A Comprehensive Archival Chandra Search for X-Ray Emission from Ultracompact Dwarf Galaxies
Greene, Jenny E.; Mulchaey, John; Pandya, Viraj
We present the first comprehensive archival study of the X-ray properties of ultracompact dwarf (UCD) galaxies, with the goal of identifying weakly accreting central black holes in UCDs. Our study spans 578 UCDs distributed across 13 different host systems, including clusters, groups, fossil groups, and isolated galaxies. Of the 336 spectroscopica…
Radar scattering of linear dunes and mega-yardangs: Application to Titan
Radebaugh, Jani; Paillou, Philippe; Wall, Stephen +1 more
The Ku-band (13.8 GHz - 2.2 cm) RADAR instrument onboard the Cassini-Huygens spacecraft has revealed the richness of the surface of Titan, as numerous seas, lakes, rivers, cryo-volcanic flows and vast dune fields have been discovered. Linear dunes are a major geomorphological feature present on Titan, covering up to 17% of its surface, mainly in e…
IVS Observation of ICRF2-Gaia Transfer Sources
Charlot, P.; Bourda, G.; Le Bail, K. +11 more
The second realization of the International Celestial Reference Frame (ICRF2), which is the current fundamental celestial reference frame adopted by the International Astronomical Union, is based on Very Long Baseline Interferometry (VLBI) data at radio frequencies in X band and S band. The European Space Agency’s Gaia mission, launched on 2013 De…
Relationship between supergranulation flows, magnetic cancellation and network flares
Solanki, S. K.; Glassmeier, K. H.; Innes, D. E. +1 more
Context. Photospheric flows create a network of often mixed-polarity magnetic field in the quiet Sun, where small-scale eruptions and network flares are commonly seen.
Aims: The aim of this paper is (1) to describe the characteristics of the flows that lead to these energy releases, (2) to quantify the energy build up due to photospheric flow…
ALMA probes the molecular gas reservoirs in the changing-look Seyfert galaxy Mrk 590
Vestergaard, M.; Peterson, B. M.; Koay, J. Y. +2 more
We investigate if the active galactic nucleus (AGN) of Mrk 590, whose supermassive black hole was until recently highly accreting, is turning off due to a lack of central gas to fuel it. We analyse new subarcsecond resolution Atacama Large Millimetre/submilllimetre Array maps of the 12CO(3-2) line and 344 GHz continuum emission in Mrk 5…