Search Publications
Identifying the Radio Bubble Nature of the Microwave Haze
Dobler, Gregory
Using seven-year data from the Wilkinson Microwave Anisotropy Probe, I identify a sharp "edge" in the microwave haze at high southern Galactic latitude (-55° < b < -35°) that is spatially coincident with the southern edge of the "Fermi haze/bubbles." This finding proves conclusively that the edge in the gamma rays is real (and not a processi…
Nonlinear Force-free Modeling of a Three-dimensional Sigmoid Observed on the Sun
Choe, G. S.; Inoue, S.; Magara, T. +1 more
In this work, we analyze the characteristics of the three-dimensional magnetic structure of a sigmoid observed over an active region (AR 10930) and followed by X-class flares. This is accomplished by combining a nonlinear force-free field (NLFFF) model of a coronal magnetic field and the high-resolution vector-field measurement of a photospheric m…
Analysis of GRB 080319B and GRB 050904 within the Fireshell Model: Evidence for a Broader Spectral Energy Distribution
Izzo, L.; Bernardini, M. G.; Patricelli, B. +5 more
The observation of GRB 080319B, with an isotropic energy E iso = 1.32 × 1054 erg, and GRB 050904, with E iso = 1.04 × 1054 erg, offers the possibility of studying the spectral properties of the prompt radiation of two of the most energetic gamma-ray bursts (GRBs). This allows us to probe the validity of …
12 Years of X-Ray Variability in M31 Globular Clusters, Including 8 Black Hole Candidates, as Seen by Chandra
Murray, S. S.; Barnard, R.; Garcia, M.
We examined 134 Chandra observations of the population of X-ray sources associated with globular clusters (GCs) in the central region of M31. These are expected to be X-ray binary systems (XBs), consisting of a neutron star or black hole accreting material from a close companion. We created long-term light curves for these sources, correcting for …
Suzaku X-Ray Follow-up Observations of Seven Unassociated Fermi-LAT Gamma-Ray Sources at High Galactic Latitudes
Cheung, C. C.; Guillemot, L.; Kataoka, J. +8 more
We report on our second-year campaign of X-ray follow-up observations of unidentified Fermi Large Area Telescope (LAT) γ-ray sources at high Galactic latitudes (|b| > 10°) using the X-ray Imaging Spectrometer on board the Suzaku X-ray Observatory. In this second year of the project, seven new targets were selected from the First Fermi-LAT Catal…
Discovery of a Compact Companion to the Hot Subdwarf Star BD +37° 442
Mereghetti, Sandro; Esposito, Paolo; Tiengo, Andrea +1 more
We report the results of the first X-ray observation of the luminous and helium-rich O-type subdwarf BD +37° 442 carried out with the XMM-Newton satellite in 2011 August. X-ray emission is detected with a flux of about 3× 10-14 erg cm-2 s-1 (0.2-1 keV) and a very soft spectrum, well fit by the sum of a blackbody wi…
Multi-wavelength Spectroscopic Observation of Extreme-ultraviolet Jet in AR 10960
Kitagawa, N.; Yokoyama, T.; Imada, S. +1 more
We have studied the relationship between the velocity and temperature of a solar EUV jet. The highly accelerated jet occurred in the active region NOAA 10960 on 2007 June 5. Multi-wavelength spectral observations with EIS/Hinode allow us to investigate Doppler velocities at a wide temperature range. We analyzed the three-dimensional angle of the j…
The Relationship between Hard X-Ray Pulse Timings and the Locations of Footpoint Sources during Solar Flares
Dennis, B. R.; Inglis, A. R.
The cause of quasi-periodic pulsations in solar flares remains the subject of debate. Recently, Nakariakov & Zimovets proposed a new model suggesting that, in two-ribbon flares, such pulsations could be explained by propagating slow waves. These waves may travel obliquely to the magnetic field, reflect in the chromosphere, and constructively i…
A Comparison of Broad Iron Emission Lines in Archival Data of Neutron Star Low-mass X-Ray Binaries
Reis, Rubens C.; Fabian, Andrew C.; Miller, Jon M. +2 more
Relativistic X-ray disklines have been found in multiple neutron star low-mass X-ray binaries, in close analogy with black holes across the mass scale. These lines have tremendous diagnostic power and have been used to constrain stellar radii and magnetic fields, often finding values that are consistent with independent timing techniques. Here, we…
HerMES: A Statistical Measurement of the Redshift Distribution of Herschel-SPIRE Sources Using the Cross-correlation Technique
Scott, D.; Béthermin, M.; Wang, L. +19 more
The wide-area imaging surveys with the Herschel Space Observatory at submillimeter (sub-mm) wavelengths have now resulted in catalogs of the order of one-hundred-thousand dusty, starburst galaxies. These galaxies capture an important phase of galaxy formation and evolution, but, unfortunately, the redshift distribution of these galaxies, N(z), is …