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Morphology and temporal variation of the polar oval of Venus revealed by VMC/Venus express visible and UV images
Imamura, Takeshi; Muto, Keishiro
The morphology of the dark polar oval seen at the Venus cloud top in visible and ultraviolet wavelengths has been unclear because the portion of the oval on the nightside is invisible. We analyzed in detail the variability of the whole shape of the oval by connecting VMC/Venus Express visible images taken on different days after shifting the image…
Surface roughness of Saturn's rings and ring particles inferred from thermal phase curves
Spilker, Linda; Morishima, Ryuji; Turner, Neal
We analyze thermal phase curves of all the main rings of Saturn (the A, B, C rings, and the Cassini division) measured by both the far-IR and mid-IR detectors of the Cassini Composite InfraRed Spectrometer (CIRS). All the rings show temperature increases toward zero phase angle, known as an opposition effect or thermal beaming. For the C ring and …
Absolute Nuv magnitudes of Gaia DR1 astrometric stars and a search for hot companions in nearby systems
Makarov, V. V.
Accurate parallaxes from Gaia DR1 (TGAS) are combined with GALEX visual Nuv magnitudes to produce absolute Mnuv magnitudes and an ultraviolet HR diagram for a large sample of astrometric stars. A functional fit is derived of the lower envelope main sequence of the nearest 1403 stars (distance <40 pc), which should be reddening-free. Using this …
Dawn-Dusk Asymmetries in the Near-Earth Plasma Sheet
Daly, P. W.; Haaland, S. E.; Grigorenko, E. E. +4 more
The Nature of Hard X-Ray (3-24 keV) Detected Luminous Infrared Galaxies in the COSMOS Field
Ueda, Yoshihiro; Matsuoka, Kenta
We investigate the nature of far-infrared (70 µm) and hard X-ray (3-24 keV) selected galaxies in the COSMOS field detected with both Spitzer and the Nuclear Spectroscopic Telescope Array (NuSTAR). By matching the Spitzer-COSMOS catalog with the NuSTAR-COSMOS catalog, we obtain a sample consisting of a hyperluminous infrared galaxy with {log}…
ALMA Maps of Dust and Warm Dense Gas Emission in the Starburst Galaxy IC 5179
van der Werf, Paul; Gao, Yu; Zhang, Zhi-Yu +6 more
We present our high-resolution (0.″15 × 0.″13, ∼34 pc) observations of the CO (6-5) line emission, which probes the warm and dense molecular gas, and the 434 µm dust continuum emission in the nuclear region of the starburst galaxy IC 5179, conducted with the Atacama Large Millimeter Array (ALMA). The CO (6-5) emission is spatially distribute…
Spectral and photometric behavior of SU UMa during quiescence and outburst states
Sanad, M. R.; Saad, S. M.; Zead, I. +2 more
We report the results of spectral and photometric observations of SU UMa. Available spectra from International Ultraviolet Explorer (IUE) and CCD photometry of five nights were used. Some profiles revealing the variations of some spectral lines at different times are presented. There is variation with time for photometric observations and the brig…
Sizes of the stellar subsystems of galaxies and intracluster stars in the Virgo cluster.
Tikhonov, N. A.
Stellar photometry for three fields in the Virgo cluster of galaxies has been performed on the basis of archival Hubble Space Telescope ACS/WFC images. The densely populated red giant branches belonging to cluster galaxies are seen on the constructed Hertzsprung-Russell diagrams. The distances to eight galaxies in the Virgo cluster have been deter…
A preliminary comparison of photometric (MWSC) and trigonometric (TGAS) distances of open cluster stars
Scholz, Ralf-Dieter; Kovaleva, Dana; Piskunov, Anatoly +1 more
The goal of this researchwas to compare the open cluster photometric distance scale of the global survey of star clusters in the MilkyWay (MWSC) with the distances derived fromtrigonometric parallaxes fromthe Gaia DR1/TGAS catalogue and to investigate towhich degree and extent both scales agree.We compared the parallax-based and photometrybased di…
The AGN Population in the Akari NEP Deep Field
Pearson, Chris; Serjeant, Stephen; Matsuhara, Hideo +6 more
The AKARI North Ecliptic Pole Deep Field is a natural location to accomplish deep extragalactic surveys. It is supported by comprehensive ancillary data extending from radio to X-ray wavelengths, which have been used to classify radio sources as radio-loud and radio-quiet objects and to create a catalogue of Active Galactic Nuclei (AGN). This has …