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Titan's middle-atmospheric temperatures and dynamics observed by the Cassini Composite Infrared Spectrometer
Nixon, Conor A.; Achterberg, Richard K.; Flasar, F. Michael +2 more
The Composite Infrared Radiometer-Spectrometer (CIRS) instrument, on the NASA Cassini Saturn orbiter, has been acquiring thermal emission spectra from the atmosphere of Titan since orbit insertion in 2004. Observation sequences for measuring stratospheric temperatures have been obtained using both a nadir mapping mode and a limb viewing mode. The …
Spectral and geological study of the sulfate-rich region of West Candor Chasma, Mars
Gendrin, Aline; Mangold, Nicolas; Bibring, Jean-Pierre +7 more
Sulfates have been discovered by the OMEGA spectrometer in different locations of the planet Mars. They are strongly correlated to light toned layered deposits in the equatorial regions. West Candor Chasma is the canyon with the thickest stack of layers and one with the largest area covered by sulfates. A detailed study coupling mineralogy derived…
Multi-wavelength observations of Galactic hard X-ray sources discovered by INTEGRAL. I. The nature of the companion star
Chaty, S.; Rahoui, F.; Foellmi, C. +3 more
Context: The INTEGRAL hard X-ray observatory has revealed an emerging population of highly obscured X-ray binary systems through multi-wavelength observations. Previous studies have shown that many of these sources are high-mass X-ray binaries hosting neutron stars orbiting around luminous and evolved companion stars.
Aims: To better understan…
Modeling Nonpotential Magnetic Fields in Solar Active Regions
van Ballegooijen, A. A.; DeLuca, E. E.; Bobra, M. G.
Electric currents are present in the coronae above solar active regions, producing nonpotential magnetic fields that can be approximated as nonlinear force-free fields (NLFFFs). In this paper NLFFF models for two active regions observed in 2002 June are presented. The models are based on magnetograms from SOHO MDI and are constrained by nonpotenti…
The type IIb SN 2008ax: the nature of the progenitor
Gal-Yam, A.; Smartt, S. J.; Maund, J. R. +9 more
A source coincident with the position of the type IIb supernova (SN) 2008ax is identified in pre-explosion Hubble Space Telescope (HST) Wide Field Planetary Camera 2 observations in three optical filters. We identify and constrain two possible progenitor systems: (i) a single massive star that lost most of its hydrogen envelope through radiatively…
Halo Gas Cross Sections and Covering Fractions of Mg II Absorption Selected Galaxies
Kacprzak, Glenn G.; Steidel, Charles C.; Churchill, Christopher W. +1 more
We examine halo gas cross sections and covering fractions, fc , of intermediate-redshift Mg II absorption selected galaxies. We computed statistical absorber halo radii, Rx, using current values of dN/dz and Schechter luminosity function parameters, and have compared these values to the distribution of impact parameters and l…
The multiwavelength variability of 3C 273
Lähteenmäki, A.; Paltani, S.; Walter, R. +11 more
Aims: We present an update of the 3C 273's database hosted by the ISDC, completed with data from radio to gamma-ray observations over the last 10 years. We use this large data set to study the multiwavelength properties of this quasar, especially focussing on its variability behaviour.
Methods: We study the amplitude of the variations and the …
Constraining dark matter properties with SPI
Boyarsky, Alexey; Ruchayskiy, Oleg; Malyshev, Denys +1 more
Using the high-resolution spectrometer SPI on board the International Gamma-Ray Astrophysics Laboratory (INTEGRAL), we search for a spectral line produced by a dark matter (DM) particle with a mass in the range 40keV < MDM < 14MeV, decaying in the DM halo of the Milky Way. To distinguish the DM decay line from numerous instrumenta…
Fluvial channels on Titan: Initial Cassini RADAR observations
Cassini RADAR Team; Kirk, Randolph L.; Lorenz, Ralph D. +13 more
Cassini radar images show a variety of fluvial channels on Titan's surface, often several hundreds of kilometers in length. Some (predominantly at low- and mid-latitude) are radar-bright and braided, resembling desert washes where fines have been removed by energetic surface liquid flow, presumably from methane rainstorms. Others (predominantly at…
Submillimeter Array Imaging of the CO(3-2) Line and 860 µm Continuum of Arp 220: Tracing the Spatial Distribution of Luminosity
Wilner, David J.; Zhang, Qizhou; Wang, Junzhi +6 more
We used the Submillimeter Array (SMA) to image 860 µm continuum and CO(3-2) line emission in the ultraluminous merging galaxy Arp 220, achieving a resolution of 0.23'' (80 pc) for the continuum and 0.33'' (120 pc) for the line. The CO emission peaks around the two merger nuclei with a velocity signature of gas rotation …