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Resolved Neutral Carbon Emission in Nearby Galaxies: [C I] Lines as Total Molecular Gas Tracers
Tan, Qinghua; Salak, Dragan; Gao, Yu +6 more
We present maps of atomic carbon [C I]({}3{{{P}}}1\to {{}3{{P}}}0) and [C I]({}3{{{P}}}2\to {{}3{{P}}}1) emission (hereafter [C I] (1-0) and [C I] (2-1), respectively) at a linear resolution ∼1 kpc scale for a sample of one H II, six LINER, three Seyfert, and f…
Transition Probabilities of Sc I and Sc II and Scandium Abundances in the Sun, Arcturus, and HD 84937
Sneden, C.; Wood, M. P.; Lawler, J. E. +3 more
New branching fraction (BF) measurements for lines of Sc I and Sc II from 24 Fourier transform spectra calibrated using standard lamps and the Ar branching ratio method are reported. The BFs for 259 lines are converted to absolute atomic transition probabilities using published radiative lifetimes from laser-induced fluorescence measurements. Deta…
Crossing the Line: Active Galactic Nuclei in the Star-forming Region of the BPT Diagram
Salim, Samir; Agostino, Christopher J.
In this work, we investigate the reliability of the BPT diagram for excluding galaxies that host an active galactic nucleus (AGN). We determine the prevalence of X-ray AGNs in the star-forming region of the BPT diagram and discuss the reasons behind this apparent misclassification, focusing primarily on relatively massive ({log}({M}* )≳…
Dramatic spectral transition of X-ray pulsar GX 304-1 in low luminous state
Doroshenko, Victor; Tsygankov, Sergey S.; Mushtukov, Alexander A. +5 more
We report on the discovery of a dramatic change in the energy spectrum of the X-ray pulsar GX 304-1 appearing at low luminosity. Particularly, we found that the cut-off power-law spectrum typical for accreting pulsars, including GX 304-1 at higher luminosities of LX ∼ 1036-1037 erg s-1, transformed at lo…
Type Ibn Supernovae May not all Come from Massive Stars
Zabludoff, Ann I.; French, K. Decker; Berger, Edo +5 more
Because core-collapse supernovae are the explosions of massive stars, which have relatively short lifetimes, they occur almost exclusively in galaxies with active star formation. On the other hand, the Type Ibn supernova PS1-12sk exploded in an environment that is much more typical of thermonuclear (Type Ia) supernovae: on the outskirts of the bri…
More than two hundred and fifty thousand spectroscopic binary or variable star candidates discovered by LAMOST
Li, Lin-Jia; Qian, Sheng-Bang; Zhu, Li-Ying +7 more
About 786.4 thousand stars were observed by LAMOST twice or more during the first stage of its spectroscopic survey. The radial velocity differences for about 256 thousand targets are larger than 10 km s-1 and they are possible spectroscopic binary or variable candidates (SBVCs). It is shown that most SBVCs are slightly metal poorer tha…
Contrast sensitivities in the Gaia Data Release 2
Cataldi, Gianni; Brandeker, Alexis
The source detection sensitivity of Gaia is reduced near sources. To characterise this contrast sensitivity is important for understanding the completeness of the Gaia data products, in particular when evaluating source confusion in lower resolution surveys such as photometric monitoring for transits. Here, we statistically evaluate the catalogue …
Interstellar Neutral Gas Species and Their Pickup Ions inside the Heliospheric Termination Shock. Ionization Rates for H, O, Ne, and He
Tokumaru, Munetoshi; Bzowski, Maciej; Sokół, Justyna M.
Solar ionizing factors are responsible for modulation of interstellar neutral gas and its derivative populations inside the heliosphere. We provide an overview of the current state of knowledge about them for heliospheric particles inside the termination shock. We discuss charge exchange with solar wind particles, photoionization, and electron imp…
Torus model properties of an ultra-hard X-ray selected sample of Seyfert galaxies
Hernán-Caballero, A.; Carrera, F. J.; Acosta-Pulido, J. A. +15 more
We characterize for the first time the torus properties of an ultra-hard X-ray (14-195 keV) volume-limited (DL < 40 Mpc) sample of 24 Seyfert (Sy) galaxies (BCS40 sample). The sample was selected from the Swift/BAT nine-month catalogue. We use high angular resolution nuclear infrared (IR) photometry and N-band spectroscopy…
Binospec Software System
Chilingarian, Igor; Paegert, Martin; Fabricant, Daniel +6 more
Binospec is a high-throughput, 370 to 1000 nm, imaging spectrograph that addresses two adjacent 8‧ by 15‧ fields of view. Binospec was commissioned in late 2017 at the f/5 focus of the 6.5 m MMT and is now available to all MMT observers. Here we describe the Binospec software used for observation planning, instrument control, and data reduction. T…