Search Publications
Energetic Fermi/LAT GRB 100414A: Energetic and Correlations
Yamaoka, Kazutaka; Tashiro, Makoto S.; Urata, Yuji +2 more
This study presents multi-wavelength observational results for energetic GRB 100414A with GeV photons. The prompt spectral fitting using Suzaku/WAM data yielded spectral peak energies of E src peak of 1458.7+132.6 - 106.6 keV and E iso of 34.5+2.0 - 1.8 × 1052 …
Measuring the black hole masses in accreting X-ray binaries by detecting the Doppler orbital motion of their accretion disc wind absorption lines
Yao, Yangsen; Zhang, Shuang-Nan; Liao, Jinyuan
So far essentially all black hole masses in X-ray binaries have been obtained by observing the companion star's velocity and light curves as functions of the orbital phase. However, a major uncertainty is the estimate of the orbital inclination angle of an X-ray binary. Here we suggest to measure the black hole mass in an X-ray binary by measuring…
Statistical ring current of Saturn
Carbary, J. F.; Arridge, C. S.; Achilleos, N.
The statistical ring current of Saturn has been determined from the curl of the median magnetic field derived from over 5 years of observations of the Cassini magnetometer. The main issue addressed here is the calculation of the statistical ring current of Saturn by directly computing, for the first time, the symmetrical part of the ring current J…
XMM-Newton and Swift observations of the Type IIb supernova 2011dh in Messier 51
Campana, Sergio; Immler, Stefan
The Type IIb supernova (SN) 2011dh exploded in the nearby galaxy M51 (the Whirlpool galaxy) and provides us with one of the best laboratories to study early high-energy emission from SNe. We give here a comprehensive view of the X-ray properties of SN 2011dh from the analyses of two pointed XMM-Newton early observations as well as the full Swift X…
New observation strategies for the solar UV spectral irradiance
Dudok de Wit, Thierry; Kretzschmar, Matthieu; Lilensten, Jean +2 more
Many applications in space weather and in space situational awareness require continuous solar spectral irradiance measurements in the UV, and to a lesser degree in the visible band. Most space-borne solar radiometers are made out of two different parts: (i) a front filter that selects the passband and (ii) a detector that is usually based on sili…
Anchoring the Distance Scale via X-Ray/Infrared Data for Cepheid Clusters: SU Cas
Bonatto, C.; Gallo, L.; Berdnikov, L. +5 more
New X-ray (XMM-Newton) and JHKs (Observatoire du Mont-Mégantic) observations for members of the star cluster Alessi 95, which Turner et al. discovered hosts the classical Cepheid SU Cas, were used in tandem with UCAC3 (proper motion) and Two Micron All Sky Survey observations to determine precise cluster parameters: E(J - H) = 0.08 ± 0.…
Newly identified star clusters in M33 - III. Structural parameters
Holtzman, J. A.; Sarajedini, A.; Garnett, D. R. +1 more
We present the morphological properties of 161 star clusters in M33 using the Advanced Camera for Surveys Wide Field Channel on-board the Hubble Space Telescope using observations with the F606W and F814W filters. We obtain, for the first time, ellipticities, position angles and surface brightness profiles for a significant number of clusters. On …
Lifetime test and heritage on orbit of coolers for space use
Nakagawa, Takao; Mitsuda, Kazuhisa; Murakami, Masahide +11 more
This report describes the results and operating status of ground lifetime testing and achievements on orbit of coolers for space use. Ground lifetime tests of coolers of three types were conducted to demonstrate their long life and reliability. Three single-stage Stirling coolers were tested for 89,016, 71,871 and 68,273 h from 1998, a two-stage S…
Ionized Reflection Spectra from Accretion Disks Illuminated by X-Ray Pulsars
Ballantyne, D. R.; Hickox, R. C.; Purvis, J. D. +1 more
X-ray reflection signatures are observed around multiple classes of accreting compact objects. Modeling these features yields important constraints on the physics of accretion disks, motivating the development of X-ray reflection models appropriate for a variety of systems and illumination conditions. Here, constant density ionized X-ray reflectio…
Cluster-cluster lensing and the case of Abell 383
Zitrin, Adi; Umetsu, Keiichi; Medezinski, Elinor +8 more
Extensive surveys of galaxy clusters motivate us to assess the likelihood of cluster-cluster lensing (CCL), namely, gravitational lensing of a background cluster by a foreground cluster. We briefly describe the characteristics of CCLs in optical, X-ray and Sunyaev-Zel'dovich effect measurements, and calculate their predicted numbers for Λ cold dar…