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SCUBA-2 overdensities associated with candidate protoclusters selected from Planck data
Andreani, P.; Valtchanov, I.; Clements, D. L. +21 more
We measure the 850-µm source densities of 46 candidate protoclusters selected from the Planck high-z catalogue (PHz) and the Planck Catalogue of Compact Sources (PCCS) that were followed up with Herschel-SPIRE and SCUBA-2. This paper aims to search for overdensities of 850-µm sources in order to select the fields that are most likely t…
Spectroscopic Observations of High-speed Downflows in a C1.7 Solar Flare
Ding, M. D.; Li, Y.; Hong, Jie +2 more
In this paper, we analyze the high-resolution UV spectra for a C1.7 solar flare (SOL2017-09-09T06:51) observed by the Interface Region Imaging Spectrograph (IRIS). We focus on the spectroscopic observations at the locations where the cool lines of Si IV 1402.8 Å (∼104.8 K) and C II 1334.5/1335.7 Å (∼104.4 K) reveal significan…
Search for the sub-stellar lithium depletion boundary in the open star cluster Coma Berenices
Béjar, V. J. S.; Martín, E. L.; Lodieu, N.
Aims: We mainly aim to search for the lithium depletion boundary (LDB) among the sub-stellar population of the open star cluster Coma Berenices.
Methods: Since the number of brown dwarf candidates in Coma Ber available in the literature is scarce, we carried out a search for additional candidates photometrically using colour-magnitude di…
Evolutionary Status of the Ap Stars HD 110066 and HD 153882
Romanovskaya, A. M.; Ryabchikova, T. A.; Shulyak, D. V.
We present the results of our determination of the fundamental atmospheric parameters for the magnetic chemically peculiar Ap stars HD 110066 (AX CVn) and HD 153882 (V451 Her). The determination of the atmospheric parameters ($T_{\textrm{eff}}$, $\textrm{log}{g}$, $R/R_{\odot}$, and $L/L_{\odot}$) is based on a self-consistent analysis of high-res…
Resolving the Nuclear Radio Emission from M32 with the Very Large Array
Li, Zhiyuan; Yuan, Feng; Sjouwerman, Loránt O. +3 more
The Local Group dwarf elliptical galaxy M32 hosts one of the nearest and most under-luminous supermassive black holes (SMBHs) ever known, offering a rare opportunity to study the physics of accreting SMBHs at the most quiescent state. Recent Very Large Array (VLA) observations detected a radio source at the nucleus of M32, which was suggested to b…
HST/COS Observations of Quasar Outflows in the 500-1050 ŠRest Frame. VII. Distances and Energetics for 11 Outflows in Five Quasars
Xu, Xinfeng; Kriss, Gerard A.; Arav, Nahum +2 more
From Hubble Space Telescope/Cosmic Origins Spectrograph spectra of five quasars, 16 outflows are detected. For 11 outflows, we are able to constrain their distances to the central source (R) and their energetics. In instances of multiple electron number density determinations (used in the calculation of R) for the same outflow, the values are cons…
Exploiting morphological data from Pulsar Wind Nebulae via a spatiotemporal leptonic transport code
Venter, C.; Seyffert, A. S.; van Rensburg, C. +1 more
The next era of ground-based Cherenkov telescope development will see a great increase in both quantity and quality of γ-ray morphological data. This initiated the development of a spatiotemporal leptonic transport code to model pulsar wind nebulae. We present results from this code that predicts the evolution of the leptonic particle spectrum and…
Spatially Resolved Study of Recombining Plasma in W49B Using XMM-Newton
Auchettl, Katie; Holland-Ashford, Tyler; Lopez, Laura A.
W49B is the youngest supernova remnant (SNR) to date that exhibits recombining plasma. The two prevailing theories of this overionization are rapid cooling via adiabatic expansion or through thermal conduction with an adjacent cooler medium. To constrain the origin of the recombining plasma in W49B, we perform a spatially resolved spectroscopic st…
Resilient habitability of nearby exoplanet systems
Mustill, Alexander J.; Davies, Melvyn B.; Kokaia, Giorgi
We investigate the possibility of finding Earth-like planets in the habitable zone of 34 nearby FGK-dwarfs, each known to host one giant planet exterior to their habitable zone detected by RV. First we simulate the dynamics of the planetary systems in their present day configurations and determine the fraction of stable planetary orbits within the…
TESS photometry of extreme helium stars PV Tel and V821 Cen
Barentsen, Geert; Handler, Gerald; Jeffery, C. Simon
PV Tel variables are extreme helium (EHe) stars known to be intrinsic light and velocity variable on characteristic time-scales of 0.1-25 d. With two exceptions, they are best described as irregular. Light curves have invariably been obtained from single-site terrestrial observatories. We present Transiting Exoplanet Survey Satellite observations …