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Improved orbits and parallaxes for eight visual binaries with unrealistic previous masses using the Hipparcos parallax
Docobo, J. A.; Malkov, O. Yu.; Tamazian, V. S. +2 more
Improved orbits are presented for the visual binaries WDS 02366+1227, WDS 02434-6643, WDS 03244-1539, WDS 08507+1800, WDS 09128-6055, WDS 11532-1540, WDS 17375+2419, and WDS 22408-0333. The latest orbits for these binaries were demonstrating a great inconsistency between the systemic mass obtained through Kepler's Third Law and that calculated as …
Observation of Neon at mid and high latitudes in the sunlit lunar exosphere: Results from CHACE aboard MIP/Chandrayaan-1
Bhardwaj, Anil; Sridharan, R.; Thampi, Smitha V. +2 more
The distribution of neutral Neon at the mid and high latitudes in the sunlit lunar exosphere observed by CHandra's Altitudinal Composition Explorer (CHACE) aboard the Moon Impact Probe (MIP) of the Chandrayaan-1 is reported. The CHACE observation was made when Moon was in the Earth's magnetotail. The upper limits of the surface number density are …
The warm absorber in the radio-loud quasar 4C +74.26
Costantini, E.; Di Gesu, L.
Outflows of photoionized gas are commonly detected in the X-ray spectra of Seyfert 1 galaxies. However, the evidence for this phenomenon in broad line radio galaxies, which are analogous to Seyfert 1 galaxies in the radio-loud regime, has so far been scarce. Here, we present the analysis of the X-ray absorption in the radio-loud quasar 4C +74.26. …
A far-ultraviolet variable with an 18-minute period in the globular cluster NGC 1851
Maccarone, T. J.; Knigge, C.; Sarajedini, A. +5 more
We present the detection of a variable star with an 18.05 min period in far-ultraviolet (FUV) images of the globular cluster NGC 1851 taken with the Hubble Space Telescope (HST). A candidate optical counterpart lies on the red horizontal branch or the asymptotic giant branch star of the cluster, but it is statistically possible that this is a chan…
Disk galaxy scaling relations at intermediate redshifts. I. The Tully-Fisher and velocity-size relations
Böhm, Asmus; Ziegler, Bodo L.
Aims: Galaxy scaling relations such as the Tully-Fisher relation (between the maximum rotation velocity Vmax and luminosity) and the velocity-size relation (between Vmax and the disk scale length) are powerful tools to quantify the evolution of disk galaxies with cosmic time.
Methods: We took spatially resolved slit…
Analysis of crater valleys, Noachis Terra, Mars: Evidence of fluvial and glacial processes
Hobbs, S. W.; Paull, D. J.; Clarke, J. D. A.
The precise mechanism for the formation and evolution of crater valley networks in the Martian southern highlands remains under debate, with precipitation, groundwater flow, and melting induced by impact being suggested. We studied valley networks within four craters of the Noachis Terra highlands that were representative of similar features in No…
Study of the polarimetric performance of a Si/CdTe semiconductor Compton camera for the Hitomi satellite
Fukazawa, Yasushi; Ohno, Masanori; Tajima, Hiroyasu +18 more
Gamma-ray polarization offers a unique probe into the geometry of the γ-ray emission process in celestial objects. The Soft Gamma-ray Detector (SGD) onboard the X-ray observatory Hitomi is a Si/CdTe Compton camera and is expected to be an excellent polarimeter, as well as a highly sensitive spectrometer due to its good angular coverage and resolut…
Suzaku observations of the 2013 outburst of KS 1947+300
Hemphill, Paul B.; Rothschild, Richard E.; Fürst, Felix +9 more
We report on the timing and spectral analysis of two Suzaku observations with different flux levels of the high-mass X-ray binary KS 1947+300 during its 2013 outburst. In agreement with simultaneous NuSTAR observations, the continuum is well described by an absorbed power law with a cutoff and an additional blackbody component. In addition, we fin…
Thermal Characteristics and the Differential Emission Measure Distribution During a B8.3 Flare on 2009 July 4
Awasthi, Arun Kumar; Jain, Rajmal; Sylwester, Barbara +1 more
We investigate the evolution of the differential emission measure distribution (DEM[T]) in various phases of a B8.3 flare which occurred on 2009 July 04. We analyze the soft X-ray (SXR) emission in the 1.6-8.0 keV range, recorded collectively by the Solar Photometer in X-rays (SphinX; Polish) and the Solar X-ray Spectrometer (Indian) instruments. …
IR heterodyne spectrometer MILAHI for continuous monitoring observatory of Martian and Venusian atmospheres at Mt. Haleakalā, Hawaii
Aoki, Shohei; Kasaba, Yasumasa; Taguchi, Makoto +11 more
A new Mid-Infrared Laser Heterodyne Instrument (MILAHI) with >106 resolving power at 7-12 µm was developed for continuous monitoring of planetary atmospheres by using dedicated ground-based telescopes for planetary science at Mt. Haleakalā, Hawaii. Room-temperature-type quantum cascade lasers (QCLs) that cover wavelength ranges…