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Different Signatures of Chromospheric Evaporation in Two Solar Flares Observed with IRIS
Gan, W. Q.; Ding, M. D.; Li, H. +2 more
We present different signatures of chromospheric evaporation in two solar flares observed by the Interface Region Imaging Spectrograph (IRIS). In the B1.6 flare on 2016 December 6 (SOL2016-12-06T10:40), the transition region Si IV line and the chromospheric C II and Mg II lines show blueshifts with low velocities up to 20 km s-1 at the …
The Ion Composition of Saturn's Equatorial Ionosphere as Observed by Cassini
Kurth, W. S.; Wahlund, J. -E.; Waite, J. H. +5 more
The Cassini Orbiter made the first in situ measurements of the upper atmosphere and ionosphere of Saturn in 2017. The Ion and Neutral Mass Spectrometer (INMS) found molecular hydrogen and helium as well as minor species including water, methane, ammonia, and organics. INMS ion mode measurements of light ion species (H+, H2
A comprehensive study of NGC 2345, a young open cluster with a low metallicity
Castro, N.; Negueruela, I.; Tabernero, H. M. +3 more
Context. NGC 2345 is a young open cluster that hosts seven blue and red supergiants, low metallicity, and a high fraction of Be stars, which makes it a privileged laboratory to study stellar evolution.
Aims: We aim to improve the determination of the cluster parameters and study the Be phenomenon. Our objective is also to characterise the sev…
CWISEP J193518.59-154620.3: An Extremely Cold Brown Dwarf in the Solar Neighborhood Discovered with CatWISE
Teplitz, Harry I.; Schlegel, David J.; Mobasher, Bahram +17 more
We present the discovery of an extremely cold, nearby brown dwarf in the solar neighborhood, found in the CatWISE catalog. Photometric follow-up with Spitzer reveals that the object, CWISEP J193518.59-154620.3, has ch1-ch2 = 3.24 ± 0.31 mag, making it one of the reddest brown dwarfs known. Using the Spitzer photometry and the polynomial relations …
Local Bubble contribution to the 353-GHz dust polarized emission
Pelgrims, V.; Skalidis, R.
It has not been shown so far whether the diffuse Galactic polarized emission at frequencies relevant for cosmic microwave background (CMB) studies originates from nearby or more distant regions of our Galaxy. This questions previous attempts that have been made to constrain magnetic field models at local and large scales. The scope of this work is…
The role of multiple images and model priors in measuring H0 from supernova Refsdal in galaxy cluster MACS J1149.5+2223
Liesenborgs, Jori; Williams, Liliya L. R.
Multiple image gravitational lensing systems with measured time delays provide a promising one-step method for determining H0. MACS J1149, which lenses SN Refsdal into a quad S1-S4, and two other widely separated images, SX and SY, is a perfect candidate. If time delays are pinned down, the remaining uncertainty arises from the mass dis…
The HST/ACS star formation history of the Tucana dwarf spheroidal galaxy: clues from the horizontal branch
Salaris, M.; Monelli, M.; Tolstoy, E. +2 more
We report a new star formation history for the Tucana dwarf spheroidal galaxy, obtained from a new look at a deep HST/ACS colour-magnitude diagram. We combined information from the main sequence turn-off and the horizontal branch to resolve the ancient star formation rates on a finer temporal scale than previously possible. We show that Tucana exp…
A Confined Partial Eruption of Double-decker Filaments
Yang, Shuhong; Chen, Yao; Zheng, Ruisheng +6 more
Filament eruptions, one of the most energetic explosions on the Sun, release large quantities of magnetized plasma into the interplanetary space. Hence, the understanding of the initiation and evolution of filament eruptions can provide broader implications for space weather and geospace climate. Here, we present a confined partial eruption of dou…
The Most Massive Galaxies with Large Depleted Cores: Structural Parameter Relations and Black Hole Masses
Dullo, Bililign T.
Luminous spheroids (M V ≲ -21.50 ± 0.75 mag) contain partially depleted cores with sizes (R b) typically 0.02-0.5 kpc. However, galaxies with R b > 0.5 kpc are rare and poorly understood. Here, we perform detailed decompositions of the composite surface brightness profiles, extracted from archival Hubble Space…
The structural properties of classical bulges and discs from z ∼ 2
Barro, Guillermo; Pérez-González, Pablo G.; Kocevski, Dale D. +19 more
We study the rest-frame optical mass-size relation of bulges and discs from z ∼ 2 to z ∼ 0 for a complete sample of massive galaxies in the CANDELS fields using two-component Sérsic models. Discs and star-forming galaxies follow similar mass-size relations. The mass-size relation of bulges is less steep than the one of quiescent galaxies (best-fit…