Search Publications
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…
Waves as the Source of Apparent Twisting Motions in Sunspot Penumbrae
Solanki, S. K.; Bharti, L.; Hirzberger, J. +2 more
The motion of dark striations across bright filaments in a sunspot penumbra has become an important new diagnostic of convective gas flows in penumbral filaments. The nature of these striations has, however, remained unclear. Here, we present an analysis of small-scale motions in penumbral filaments in both simulations and observations. The simula…
Observations of Outflowing Ultraviolet Absorbers in NGC 4051 with the Cosmic Origins Spectrograph
Turner, T. J.; Kraemer, S. B.; Crenshaw, D. M. +6 more
We present new Hubble Space Telescope (HST)/Cosmic Origins Spectrograph (COS) observations of the narrow-line Seyfert 1 galaxy NGC 4051. These data were obtained as part of a coordinated observing program including X-ray observations with the Chandra/High Energy Transmission Grating (HETG) spectrometer and Suzaku. We detected nine kinematic compon…
Magnetic Topology of a Naked Sunspot: Is It Really Naked?
Sainz Dalda, A.; Tarbell, T. D.; Vargas Domínguez, S.
The high spatial, temporal, and spectral resolution achieved by Hinode instruments gives much better understanding of the behavior of some elusive solar features, such as pores and naked sunspots. Their fast evolution and, in some cases, their small sizes have made their study difficult. The moving magnetic features (MMFs) have been studied during…
A Multi-wavelength Study of the Jet, Lobes, and Core of the Quasar PKS 2101-490
Birkinshaw, M.; Worrall, D. M.; Schwartz, D. A. +9 more
We present a detailed study of the x-ray, optical, and radio emission from the jet, lobes, and core of the quasar PKS 2101-490 as revealed by new Chandra, Hubble Space Telescope (HST), and ATCA images. We extract the radio to x-ray spectral energy distributions from seven regions of the 13'' jet, and model the jet x-ray emission in terms of Dopple…
Spitzer Observations of Shock-excited Hydrogen Deuteride in IC 443C, HH 7, and HH 54: Probing the Gas-phase Deuterium Abundance in the Dense Interstellar Medium
Watson, Dan M.; Yuan, Yuan; Neufeld, David A. +2 more
We present and analyze observations—carried out using the Infrared Spectrograph (IRS) on the Spitzer Space Telescope—of the R(3) and R(4) pure rotational lines of hydrogen deuteride (HD) detected from shock-heated material associated with the supernova remnant IC 443C and with the Herbig-Haro objects HH 7 and HH 54. Assuming a continuous temperatu…