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Cassini UVIS observations of Titan ultraviolet airglow intensity dependence with solar zenith angle
West, R. A.; Esposito, L. W.; Royer, E. M. +3 more
The Cassini Ultraviolet Imaging Spectrometer (UVIS) observed the airglow (dayglow and nightglow) of Titan over a range of solar zenith angles (SZA) from 14 to 150° on five separate observations obtained between 2008 and 2012. The modeling of the solar cycle normalized UVIS observations indicates that a Chapman layer function provides a satisfactor…
Evolution of an equatorial coronal hole structure and the released coronal hole wind stream: Carrington rotations 2039 to 2050
Wimmer-Schweingruber, Robert F.; Berger, Lars; Heidrich-Meisner, Verena +2 more
Context. The Sun is a highly dynamic environment that exhibits dynamic behavior on many different timescales. Variability is observed both in closed and in open field line regions in the solar corona. In particular, coronal holes exhibit temporal and spatial variability. Signatures of these coronal dynamics are inherited by the coronal hole wind s…
X-ray study of extended emission around M 86 observed with Suzaku
Fujimoto, Ryuichi; Tanaka, Keigo; Hishi, Ukyo +4 more
We analyzed the Suzaku data of M 86 and its adjacent regions to study the extended emission around it. The M 86 core, the plume, and the tail extending toward the northwest were clearly detected, as well as the extended halo around them. From the position angle ∼ 45° to ∼ 275°, the surface brightness distribution of the core and the extended halo …
Nep-Akari Evolution with Redshift of Dust Attenuation in 8 ㎛ Selected Galaxies
Buat, V.; Burgarella, D.; Serjeant, S. +8 more
We built a 8um selected sample of galaxies in the NEP-AKARI field by defining 4 redshift bins with the four AKARI bands at 11, 15, 18 and 24 microns (0.15<z<0.49, 0.75<z<1.34, 1.34<z<1.7 and 1.7<z<2.05) . Our sample contains 4079 sources, 599 are securely detected with Herschel/PACS. Also adding ultraviolet (UV) data from G…
Three-dimensional model of the irradiance of cometary nuclei: Using the nucleus of comet 67P/Churyumov–Gerasimenko as an example
Dorofeeva, V. A.; Marov, M. Ya.; Rusol, A. V.
The goal of this paper is to construct a 3D model of the surface of a cometary nucleus that allows the irradiance nonuniformity and temperature distribution to be investigated. This is very important, because in zones with a maximum surface temperature chemical and physical transformations of material are possible in subsurface layers. We propose …
Spectral behavior of the symbiotic nova AG Pegasi observed with IUE and HST
Sanad, M. R.; Bobrowsky, M.
Ultraviolet spectra from the International Ultraviolet Explorer (IUE) and from the Hubble Space Telescope (HST) of the symbiotic novae AG Peg during the period 1978-1996 are analyzed. Some spectra showing the modulations of spectral lines at different times are presented. We determined the reddening from the 2200 Å feature, finding that E(B-V) = 0…
Spectral Properties and Variability of BIS objects
Nesci, R.; Rossi, C.; Gaudenzi, S. +3 more
Through the analysis and interpretation of newly obtained and of literature data we have clarified the nature of poorly investigated IRAS point sources classified as late type stars, belonging to the Byurakan IRAS Stars catalog. From medium resolution spectroscopy of 95 stars we have strongly revised 47 spectral types and newly classified 31 sourc…
Catalog of 3<z<5.5 quasar candidates selected among XMM-Newton sources and its spectroscopic verification
Khorunzhev, Georgii; Sazonov, Sergey; Burenin, Rodion +1 more
We have compiled a catalog of 903 quasar candidates (including known quasars) at 3<z<5.5 selected among X-ray sources from the XMM-Newton serendipitous survey (3XMM-DR4 catalog). We used photometric SDSS, 2MASS and WISE data to select the objects. The surface number density of objects in our sample exceeds that in the SDSS spectroscopic quas…
A submillimeter study of the IR dust bubble S 21 and its environs
Rubio, M.; Borissova, J.; Firpo, V. +4 more
Based on the molecular emission in the 12CO(2-1) and 13CO(2-1) lines, and on the continuum emission in the MIR and FIR towards the S 21 IR dust bubble, we analyze the physical characteristics of the gas and dust linked to the nebula and the presence of young stellar objects (YSOs) in its environs. The line emission reveals a …
An All-Sky Portable (ASP) Optical Catalogue
Flesch, Eric Wim
This optical catalogue combines the all-sky USNO-B1.0/A1.0 and most-sky APM catalogues, plus overlays of SDSS optical data, into a single all-sky map presented in a sparse binary format that is easily downloaded at 9 Gb zipped. Total count is 1 163 237 190 sources and each has J2000 astrometry, red and blue magnitudes with PSFs and variability ind…