Search Publications
Maser Observations of Westerlund 1 and Comprehensive Considerations on Maser Properties of Red Supergiants Associated with Massive Clusters
Hsia, Chih-Hao; Yung, Bosco H. K.; Nakashima, Jun-ichi +2 more
We report the results of Australia Telescope Compact Array observations of the Westerlund 1 (Wd1) region in the SiO v = 1, J = 1-0, and H2O 616-523 maser lines, and we also report the analysis of maser properties of red supergiants (RSGs) associated with six massive clusters including Wd1. The primary purpose of th…
Abrupt Changes of the Photospheric Magnetic Field in Active Regions and the Impulsive Phase of Solar Flares
Petrie, G. J. D.; Ling, A. G.; Cliver, E. W.
We compared time profiles of changes of the unsigned photospheric magnetic flux in active regions with those of their associated soft X-ray (SXR) bursts for a sample of 75 >= M5 flares well observed by Global Oscillation Network Group longitudinal magnetographs. Sixty-six of these events had stepwise changes in the spatially integrated unsigned…
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 …
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.…
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…
Non-standard Energy Spectra of Shock-accelerated Solar Particles
Vainio, Rami; Valtonen, Eino; Kocharov, Leon +3 more
We consider a numerical model for the shock acceleration of energetic ions in the magnetic environment of the solar corona. The model is motivated by observations of the deka-to-hecto-MeV proton energy spectra, ion and electron timing, and abundances in the beginning of major solar energetic particle (SEP) events, prior to the event's main phase a…
The Infrared Properties of Sources Matched in the WISE All-sky and Herschel ATLAS Surveys
Gardner, Jonathan P.; Tsai, Chao-Wei; Cava, Antonio +34 more
We describe the infrared properties of sources detected over ~36 deg2 of sky in the GAMA 15 hr equatorial field, using data from both the Herschel Astrophysical Terahertz Large-Area Survey (H-ATLAS) and Wide-field Infrared Survey (WISE). With 5σ point-source depths of 34 and 0.048 mJy at 250 µm and 3.4 µm, respectively, we a…
INTEGRAL and Swift Observations of the Be X-Ray Binary 4U 1036-56 (RX J1037.5-5647) and its Possible Relation with γ-Ray Transients
Torres, Diego F.; Li, Jian; Chen, Yupeng +3 more
We present timing, spectral, and long-term temporal analysis of the high-mass X-ray binary 4U 1036-56 using INTEGRAL and Swift observations. We show that it is a weak hard X-ray source spending a major fraction of the time in quiescence and only occasionally characterized by X-ray outbursts. The outburst activity we report here lasts several days,…
Observational Limits on the Gas Mass of a z = 4.9 Galaxy
Smail, Ian; Swinbank, A. M.; Bower, R. G. +6 more
We present the results of a search for molecular gas emission from a star-forming galaxy at z = 4.9. The galaxy benefits from magnification of 22 ± 5 × due to strong gravitational lensing by the foreground cluster MS1358+62. We target the CO(5-4) emission at a known position and redshift from existing Hubble Space Telescope/Advanced Camera for Sur…
Detection of New Point Sources in WMAP 7 Year Data Using Internal Templates and Needlets
Scodeller, Sandro; Hansen, Frode K.; Marinucci, Domenico
We have developed a new needlet-based method to detect point sources in cosmic microwave background (CMB) maps and have applied it to the Wilkinson Microwave Anisotropy Probe (WMAP) 7 year data. We use both the individual frequency channels as well as internal templates, the latter being the difference between pairs of frequency channels and hence…