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Analysis of Local Slopes at the InSight Landing Site on Mars
Kirk, R. L.; Golombek, M. P.; Fergason, R. L. +6 more
To evaluate the topography of the surface within the InSight candidate landing ellipses, we generated Digital Terrain Models (DTMs) at lander scales and those appropriate for entry, descent, and landing simulations, along with orthoimages of both images in each stereopair, and adirectional slope images. These products were used to assess the distr…
Discovery of carbon-rich Miras in the Galactic bulge
Matsunaga, Noriyuki; Whitelock, Patricia A.; Aydi, Elias +4 more
Only one carbon-rich (C-rich, hereinafter) Mira variable has so far been suggested as a member of the Galactic bulge and this is in a symbiotic system. Here we describe a method for selecting C-rich candidates from an infrared colour-colour diagram, (J - Ks) versus ([9] - [18]). Follow-up low-resolution spectroscopy resulted in the dete…
The AT-LESS CO(1-0) survey of submillimetre galaxies in the Extended Chandra Deep Field South: First results on cold molecular gas in galaxies at z ∼ 2
Thomson, A. P.; Ivison, R. J.; Smail, Ian +13 more
We present the first results from our ongoing Australia Telescope Compact Array survey of 12CO(1-0) in Atacama Large Millimeter Array (ALMA)-identified submillimetre galaxies (SMGs) in the Extended Chandra Deep Field South. Strong detections of 12CO(1-0) emission from two SMGs, ALESS 122.1 (z = 2.0232) and ALESS 67.1 (z = 2.1…
The Close AGN Reference Survey (CARS). Mrk 1018 halts dimming and experiences strong short-term variability
Combes, F.; Scharwächter, J.; Eckart, A. +12 more
After changing optical AGN type from 1.9 to 1 in 1984, the AGN Mrk 1018 recently reverted back to its type 1.9 state. Our ongoing monitoring now reveals that the AGN has halted its dramatic dimming, reaching a minimum around October 2016. The minimum was followed by an outburst rising with 0.25 U-band mag/month. The rebrightening lasted at least u…
Stellar laboratories . IX. New Se v, Sr iv-vii, Te vi, and I vi oscillator strengths and the Se, Sr, Te, and I abundances in the hot white dwarfs G191-B2B and RE 0503-289
Hoyer, D.; Rauch, T.; Werner, K. +4 more
Context. To analyze spectra of hot stars, advanced non-local thermodynamic equilibrium (NLTE) model-atmosphere techniques are mandatory. Reliable atomic data is crucial for the calculation of such model atmospheres.
Aims: We aim to calculate new Sr iv-vii oscillator strengths to identify for the first time Sr spectral lines in hot white dwarf…
Near-Infrared Knots and Dense Fe Ejecta in the Cassiopeia A Supernova Remnant
Koo, Bon-Chul; Lee, Jae-Joon; Moon, Dae-Sik +2 more
We report the results of broadband (0.95-2.46 µm) near-infrared spectroscopic observations of the Cassiopeia A supernova remnant. Using a clump-finding algorithm in two-dimensional dispersed images, we identify 63 “knots” from eight slit positions and derive their spectroscopic properties. All of the knots emit [Fe II] lines together with ot…
Absolute Magnitudes of Seismic Red Clumps in the Kepler Field and SAGA: The Age Dependency of the Distance Scale
Zhao, G.; Casagrande, L.; Bovy, J. +4 more
Red clump stars are fundamental distance indicators in astrophysics, although theoretical stellar models predict a dependence of absolute magnitudes with age. This effect is particularly strong below ∼2 Gyr, but even above this limit a mild age dependence is still expected. We use seismically identified red clump stars in the Kepler field for whic…
The Unusual Apparition of Comet 252P/2000 G1 (LINEAR) and Comparison with Comet P/2016 BA14 (PanSTARRS)
Samarasinha, Nalin H.; Tholen, David J.; Li, Jian-Yang +7 more
We imaged Comet 252P/2000 G1 (LINEAR; hereafter 252P) with the Hubble Space Telescope and both 252P and P/2016 BA14 (PanSTARRS; hereafter BA14) with the Discovery Channel Telescope in 2016 March and April, surrounding its close encounter to Earth. The r‧-band Afρ of 252P in a 0.″2-radius aperture were 16.8 ± 0.3 and 57 ± 1 cm…
High-latitude Conic Current Sheets in the Solar Wind
Tokumaru, Munetoshi; Fujiki, Ken'ichi; Malova, Helmi V. +7 more
We provide observational evidence for the existence of large-scale cylindrical (or conic-like) current sheets (CCSs) at high heliolatitudes. Long-lived CCSs were detected by Ulysses during its passages over the South Solar Pole in 1994 and 2007. The characteristic scale of these tornado-like structures is several times less than a typical width of…
INTEGRAL IBIS, SPI, and JEM-X observations of LVT151012
Sunyaev, R.; Hanlon, L.; Mereghetti, S. +18 more
During the first observing run of LIGO, two gravitational wave events and one lower-significance trigger (LVT151012) were reported by the LIGO/Virgo collaboration. At the time of LVT151012, the INTErnational Gamma-Ray Astrophysics Laboratory (INTEGRAL) was pointing at a region of the sky coincident with the high localization probability area of th…