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Dual AGN Candidates with Double-peaked [O III] Lines Matching that of Confirmed Dual AGNs
Kim, D. -C.; Momjian, E.; Kim, Minjin +3 more
We have performed a spectral decomposition to search for dual active galactic nuclei (DAGNs) in the Sloan Digital Sky Survey (SDSS) quasars with z < 0.25. Potential DAGN candidates are searched by referencing velocity offsets and spectral shapes of double-peaked [O III] lines of known DAGNs. Out of 1271 SDSS quasars, we have identified 77 DAGN …
Solar Electrons and Protons in the Events of September 4-10, 2017 and Related Phenomena
Logachev, Yu. I.; Struminskii, A. B.; Grigor'eva, I. Yu. +1 more
The solar proton events on September 4-10, 2017 motivated us to reconsider the hypothesis of the presence of two phases of acceleration of charged particles in solar flares in which nonrelativistic electrons are accelerated in the first phase, while relativistic electrons and protons are accelerated during the second phase. According to the data o…
The interior of Comet 67P/C-G; revisiting CONSERT results with the exact position of the Philae lander
Kofman, Wlodek; Herique, Alain; Rogez, Yves +3 more
CONSERT, a bistatic radar onboard the Rosetta spacecraft and its Philae lander, was designed to probe the nucleus of comet 67P/Churyumov-Gerasimenko with radio waves at 90 MHz frequency. In 2016 September, the exact position of Philae was retrieved, within the region previously identified by CONSERT. This allowed us to revisit the measurements and…
Radial Star Formation Histories in 32 Nearby Galaxies
Kobulnicky, Henry A.; Dale, Daniel A.; Cox, Isaiah S. +10 more
The spatially resolved star formation histories are studied for 32 normal star-forming galaxies drawn from the Spitzer Extended Disk Galaxy Exploration Science survey. At surface brightness sensitivities fainter than 28 mag arcsec-2, the new optical photometry is deep enough to complement archival ultraviolet and infrared imaging and to…
Detections of Dust in the Outskirts of M31 and M33
Ruoyi, Zhang; Haibo, Yuan
M31 and M33 serve as ideal places to study distributions of dust in the outskirts of spiral galaxies. In this Letter, using about 0.2 million stars selected from the LAMOST data and combining precise photometry and parallaxes from the Gaia DR2, we have constructed a two-dimensional foreground dust reddening map toward the M31 and M33 region (111°2…
Using Gaia DR2 to solve differential colour refraction and charge transfer efficiency issues
Lin, F. R.; Peng, Q. Y.; Zheng, Z. J.
The Gaia DR2 catalogue released in 2018 gives information about more than one billion stars, including their extremely precise positions that are not affected by the atmosphere, as well as the magnitudes in the G, RP, and BP passbands. This information provides great potential for the improvement of the ground-based astrometry. Based on Gaia DR2, …
2MASS J15491331-3539118: a new low-mass wide companion of the GQ Lup system
Alcalá, J. M.; Manara, C. F.; D'Orazi, V. +14 more
Substellar companions at wide separation around stars hosting planets or brown dwarfs (BDs) yet close enough for their formation in the circumstellar disc are of special interest. In this Letter we report the discovery of a wide (projected separation ∼16.0", or 2400 AU, and position angle 114.61°) companion of the GQ Lup A-B system, most likely gr…
The Swift Bulge Survey: optical and near-IR follow-up featuring a likely symbiotic X-ray binary and a focused wind CV
Maccarone, T. J.; Degenaar, N.; Wijnands, R. +13 more
The nature of very faint X-ray transients (VFXTs) - transient X-ray sources that peak at luminosities L_X≲ 10^{36} { erg s^{-1}} - is poorly understood. The faint and often short-lived outbursts make characterizing VFXTs and their multiwavelength counterparts difficult. In 2017 April we initiated the Swift Bulge Survey, a shallow X-ray survey of ∼…
Detection of Small Flares from the Crab Nebula with Fermi-LAT
Uchiyama, Yasunobu; Hayashida, Masaaki; Khangulyan, Dmitry +1 more
Gamma radiation from the Crab pulsar wind nebula (PWN) shows significant variability at ∼100 MeV energies, recently revealed with spaceborne gamma-ray telescopes. Here we report the results of a systematic search for gamma-ray flares using a 7.4 yr data set acquired with the Fermi Large Area Telescope. Analyzing the off-pulse phases of the Crab pu…
Atmosphere Models of Brown Dwarfs Irradiated by White Dwarfs: Analogs for Hot and Ultrahot Jupiters
Lothringer, Joshua D.; Casewell, Sarah L.
Irradiated brown dwarfs (BDs) provide natural laboratories to test our understanding of substellar and irradiated atmospheres. A handful of short-period BDs around white dwarfs (WDs) have been observed, but the uniquely intense UV-dominated irradiation presents a modeling challenge. Here, we present the first fully self-consistent 1D atmosphere mo…