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DeGaS-MC: Dense Gas Survey in the Magellanic Clouds. I. An APEX survey of HCO+ and HCN(2-1) toward the LMC and SMC
Immer, K.; Lebouteiller, V.; Madden, S. C. +9 more
Context. Understanding the star-forming processes is key to understanding the evolution of galaxies. Investigating star formation requires precise knowledge of the properties of the dense molecular gas complexes where stars form and a quantification of how they are affected by the physical conditions to which they are exposed. The proximity, low m…
Newly Improved Ionization Corrections for the Neutral Interstellar Medium: Enabling Accurate Abundance Determinations in Star-forming Galaxies throughout the Universe
Hernandez, Svea; Aloisi, Alessandra; James, Bethan L. +4 more
Studies measuring the chemical abundances of the neutral gas in star-forming galaxies (SFGs) require ionization correction factors (ICFs) to accurately measure their metal contents. In the work presented here, we calculate newly improved ICFs for a sample of SFGs. These new corrections include both the contaminating ionized gas along the line of s…
On the Motion of Stars in the Pleiades According to Gaia DR2 Data
Danilov, V. M.; Seleznev, A. F.
—Several parameters of the Pleiades cluster were estimated. We used Gaia DR2 data on the coordinates, proper motions, and radial velocities of stars in regions with radius d° =2.5° and size 60° × 60° around the cluster center. Based on data on stars with magnitudes mG ≤ 18m, we constructed a map and profile of the density, lu…
The High Helium Abundance and Charge States of the Interplanetary CME and Its Material Source on the Sun
Harrison, R. A.; Davies, J. A.; Barnes, D. +5 more
Identifying the source of the material within coronal mass ejections (CMEs) and understanding CME onset mechanisms are fundamental issues in solar and space physics. Parameters relating to plasma composition, such as charge states and He abundance (AHe), may be different for plasmas originating from differing processes or regions on the…
Hot Subdwarf All Southern Sky Fast Transit Survey with the Evryscope
Law, Nicholas M.; Németh, Péter; Glazier, Amy +6 more
We have conducted a survey of candidate hot subdwarf (HSD) stars in the southern sky searching for fast transits, eclipses, and sinusoidal-like variability in the Evryscope light curves. The survey aims to detect transit signals from Neptune-size planets to gas giants, and eclipses from M-dwarfs and brown dwarfs. The other variability signals are …
The discovery of lambda Bootis stars - the Southern Survey II
Bedding, Timothy R.; Murphy, Simon J.; Gray, Richard O. +3 more
The λ Boo stars are chemically peculiar A-type stars whose abundance anomalies are associated with the accretion of metal-poor material. We searched for λ Boo stars in the Southern hemisphere in a targeted spectroscopic survey of metal-weak and emission-line stars. Obtaining spectra for 308 stars and classifying them on the MK system, we found or …
Comparison of simulated backgrounds with in-orbit observations for HE, ME, and LE onboard Insight-HXMT
Li, Gang; Li, Xiaobo; Tuo, Youli +10 more
Insight-HXMT, the first X-ray astronomical satellite in China, aims to reveal new sources in the Galaxy and to study fundamental physics of X-ray binaries from 1 to 250 keV. It has three collimated telescopes, the High Energy X-ray telescope (HE), the Medium Energy X-ray telescope (ME), and the Low Energy X-ray telescope (LE). Before the launch, i…
Searching for the near-infrared counterpart of Proxima c using multi-epoch high-contrast SPHERE data at VLT
Ménard, F.; Henning, T.; Brandner, W. +43 more
Context. Proxima Centauri is the closest star to the Sun and it is known to host an Earth-like planet in its habitable zone; very recently a second candidate planet was proposed based on radial velocities. At quadrature, the expected projected separation of this new candidate is larger than 1 arcsec, making it a potentially interesting target for …
Jupiter's X-ray Emission During the 2007 Solar Minimum
Jackman, C. M.; Paranicas, C.; Ness, J. -U. +22 more
The 2007-2009 solar minimum was the longest of the space age. We present the first of two companion papers on Chandra and XMM-Newton X-ray campaigns of Jupiter through February-March 2007. We find that low solar X-ray flux during solar minimum causes Jupiter's equatorial regions to be exceptionally X-ray dim (0.21 GW at minimum; 0.76 GW at maximum…
Chandra and XMM-Newton observations of A2256: cold fronts, merger shocks, and constraint on the IC emission
Rudnick, Lawrence; Finoguenov, Alexis; Clarke, Tracy E. +13 more
We present the results of deep Chandra and XMM-Newton observations of a complex merging galaxy cluster Abell 2256 (A2256) that hosts a spectacular radio relic (RR). The temperature and metallicity maps show clear evidence of a merger between the western subcluster (SC) and the primary cluster (PC). We detect five X-ray surface brightness edges. Th…