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Constraining the Dust Opacity Law in Three Small and Isolated Molecular Clouds
Di Francesco, J.; Sadavoy, S.; Kainulainen, J. +6 more
Density profiles of isolated cores derived from thermal dust continuum emission rely on models of dust properties, such as mass opacity, that are poorly constrained. With complementary measures from near-infrared extinction maps, we can assess the reliability of commonly used dust models. In this work, we compare Herschel-derived maps of the optic…
Emission-line stars in M31 from the SPLASH and PHAT surveys
Williams, Benjamin F.; Seth, Anil C.; Dalcanton, Julianne J. +7 more
We present a sample of 224 stars that emit Hα (Hα stars) in the Andromeda galaxy (M31). The stars were selected from ∼5000 spectra, collected as part of the Spectroscopic and Photometric Landscape of Andromeda's Stellar Halo survey using Keck II/DEIMOS. We used six-filter Hubble Space Telescope photometry from the Panchromatic Hubble Andromeda Tre…
B stars seen at high resolution by XMM-Newton
Nazé, Yaël; Cazorla, Constantin
We report on the properties of 11 early B stars observed with gratings on board XMM-Newton and Chandra, thereby doubling the number of B stars analysed at high resolution. The spectra typically appear soft, with temperatures of 0.2-0.6 keV, and moderately bright (log [LX/LBOL] -7) with lower values for later type stars. In li…
Foreground of Gamma-Ray Bursts (grbs) from Akari Fis Data
Doi, Yasuo; Zahorecz, Sarolta; Toth, L. Viktor +4 more
A significant number of the parameters of a gamma-ray burst (GRB) and its host galaxy are calculated from the afterglow. There are various methods obtaining extinction values for the necessary correction for galactic foreground. These are: galaxy counts, from HI 21 cm surveys, from spectroscopic measurements and colors of nearby Galactic stars, or…
Cometary science after Rosetta
Knight, Matthew M.; Jones, Geraint H.; Fitzsimmons, Alan +1 more
The European Space Agency's Rosetta mission ended operations on 30 September 2016 having spent over 2 years in close proximity to its target comet, 67P/Churyumov-Gerasimenko. Shortly before this, in summer 2016, a discussion meeting was held to examine how the results of the mission could be framed in terms of cometary and solar system science in …
Suzaku observations of spectral variations of the ultra-luminous X-ray source Holmberg IX X-1
Makishima, Kazuo; Nakazawa, Kazuhiro; Kobayashi, Shogo B.
Observations of the ultra-luminous X-ray source (ULX) Holmberg IX X-1 were carried out with Suzaku twice, once on 2012 April 13 and then on 2012 October 24, with exposures of 180 ks and 217 ks, respectively. The source showed a hard power-law shaped spectrum with a mild cutoff at ∼8 keV, which is typical of ULXs when they are relatively dim. On bo…
Turbulent processes in Earth's magnetosheath by Cluster mission measurements
Lui, A. T. Y.; Kronberg, E. A.; Kozak, L. V. +1 more
Methods and approaches which can be used for the analysis of hydrodynamic and magnetohydrodynamic turbulent flows are chosen for this study. It is defined that the best methods for determination of turbulent process types are the methods of statistical physics. Within the statistical approach the fractal analysis (height of the maximum of probabil…
Multiwavelength observations of the Be/X-ray binary IGR J01217-7257 (=SXP 2.16) during outburst
Udalski, A.; Coe, M. J.; Bird, A. J. +6 more
We present simultaneous, multiwavelength observations of the Small Magellanic Cloud Be/XRB IGR J01217-7257 (=SXP 2.16) during outbursts in 2014, 2015 and 2016. We also present the results of the RXTE observations of the Small Magellanic Cloud during which the source was initially discovered with a periodicity of 2.1652 ± 0.0001 s that we associate…
Ionospheric Electron Densities at Mars: Comparison of Mars Express Ionospheric Sounding and MAVEN Local Measurements
Gurnett, D. A.; Němec, F.; Morgan, D. D. +5 more
We present the first direct comparison of Martian ionospheric electron densities measured by the Mars Advanced Radar for Subsurface and Ionospheric Sounding (MARSIS) topside radar sounder on board the Mars Express spacecraft and by the Langmuir Probe and Waves (LPW) instrument on board the Mars Atmosphere and Volatile Evolution Mission (MAVEN) spa…
A Jupiter-mass planet around the K0 giant HD 208897
Yılmaz, M.; Sato, B.; Bikmaev, I. +9 more
For over 10 years, we have carried out a precise radial velocity (RV) survey to find substellar companions around evolved G, K-type stars to extend our knowledge of planet formation and evolution. We performed high precision RV measurements for the giant star