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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…
Dayside temperatures in the Venus upper atmosphere from Venus Express/VIRTIS nadir measurements at 4.3 µm
López-Valverde, M. A.; Gilli, G.; Peralta, J. +1 more
In this work, we analysed nadir observations of atmospheric infrared emissions carried out by VIRTIS, a high-resolution spectrometer on board the European spacecraft Venus Express. We focused on the ro-vibrational band of CO2 at 4.3 µm on the dayside, whose fluorescence originates in the Venus upper mesosphere and above. This is t…
Near-infrared photometry of WISE J085510.74-071442.5
Minniti, D.; Bayo, A.; Béjar, V. J. S. +7 more
Aims: We aim at obtaining near-infrared photometry and deriving the mass, age, temperature, and surface gravity of WISE J085510.74-071442.5 (J0855-0714), which is the coolest object beyond the solar system currently known.
Methods: We used publicly available data from the archives of the Hubble Space Telescope (HST) and the Very Large Te…
Multiwavelength study of the fast rotating supergiant high-mass X-ray binary IGR J16465-4507
Goldoni, P.; Chaty, S.; Simón-Díaz, S. +6 more
Context. Since its launch, the X-ray and γ-ray observatory INTEGRAL satellite has revealed a new class of high-mass X-ray binaries (HMXB) displaying fast flares and hosting supergiant companion stars. Optical and infrared (OIR) observations in a multi-wavelength context are essential to understand the nature and evolution of these newly discovered…
Joint signal extraction from galaxy clusters in X-ray and SZ surveys: A matched-filter approach
Arnaud, M.; Pratt, G. W.; Melin, J. -B. +1 more
The hot ionized gas of the intra-cluster medium emits thermal radiation in the X-ray band and also distorts the cosmic microwave radiation through the Sunyaev-Zel'dovich (SZ) effect. Combining these two complementary sources of information through innovative techniques can therefore potentially improve the cluster detection rate when compared to u…
Dependence of the broad Fe Kα line on the physical parameters of AGN
Lu, Youjun; Liu, Zhu; Yuan, Weimin +3 more
In this paper, the dependence of the broad Fe Kα line on the physical parameters of AGN, such as the black hole mass MBH, accretion rate (equivalently represented by Eddington ratio λEdd) and optical classification is investigated by applying the X-ray spectra stacking method to a large sample of AGN which have well measured …
Astronomical surveys and big data
Mickaelian, Areg M.
Recent all-sky and large-area astronomical surveys and their catalogued data over the whole range of electromagnetic spectrum, from γ -rays to radio waves, are reviewed, including such as Fermi-GLAST and INTEGRAL in γ -ray, ROSAT, XMM and Chandra in X-ray, GALEX in UV, SDSS and several POSS I and POSS II-based catalogues (APM, MAPS, USNO, GSC) in …