Search Publications
The Resolved Outflow from 3C 48
Shih, Hsin-Yi; Stockton, Alan
We investigate the properties of the high-velocity outflow driven by the young radio jet of 3C 48, a compact-steep-spectrum source. We use the Space Telescope Imaging Spectrograph on board the Hubble Space Telecope to obtain (1) low-resolution UV and optical spectra and (2) multi-slit medium-resolution spectra of the ionized outflow. With supporti…
Subaru Spectroscopy and Spectral Modeling of Cygnus A
Imanishi, Masatoshi; Perlman, Eric S.; Nikutta, Robert +6 more
We present high angular resolution (~0.''5) MIR spectra of the powerful radio galaxy, Cygnus A (Cyg A), obtained with the Subaru telescope. The overall shape of the spectra agree with previous high angular resolution MIR observations, as well as previous Spitzer spectra. Our spectra, both on and off nucleus, show a deep silicate absorption feature…
The Extraordinary Far-infrared Variation of a Protostar: Herschel/PACS Observations of LRLL54361
Henning, Thomas; Bally, John; Marton, Gabor +11 more
We report Herschel/Photodetector Array Camera and Spectrometer (PACS) photometric observations at 70 µm and 160 µm of LRLL54361—a suspected binary protostar that exhibits periodic (P = 25.34 days) flux variations at shorter wavelengths (3.6 µm and 4.5 µm) thought to be due to pulsed accretion caused by binary motion. The PA…
An XMM-Newton View of the Radio Galaxy 3C 411
Reynolds, Christopher S.; Tombesi, Francesco; Bostrom, Allison
We present the first high signal-to-noise XMM-Newton observations of the broad-line radio galaxy 3C 411. After fitting various spectral models, an absorbed double power-law (PL) continuum and a blurred relativistic disk reflection model (kdblur) are found to be equally plausible descriptions of the data. While the softer PL component (Γ = 2.11) of…
XMM-Newton Observations of Three Interacting Luminous Infrared Galaxies
Maiolino, Roberto; Komossa, S.; Nicastro, Fabrizio +8 more
We investigate the X-ray properties of three interacting luminous infrared galaxy systems. In one of these systems, IRAS 18329+5950, we resolve two separate sources. A second and third source, IRAS 19354+4559 and IRAS 20550+1656, have only a single X-ray source detected. We compare the observed emission to point-spread function (PSF) profiles and …
Temperature Anisotropy in the Presence of Ultra Low Frequency Waves in the Terrestrial Foreshock
Eastwood, J. P.; Burgess, D.; Nakariakov, V. M. +3 more
We report the first study of the correlation between elevated solar wind core plasma temperatures and temperature anisotropy in the terrestrial foreshock. Plasma temperature is enhanced near the fire hose marginal stability threshold in the presence of ultra low frequency (ULF) large amplitude magnetic perturbations, which are intrinsically right-…
Discovery of a New Black Hole Transient within 100'' (400 pc) of M31*
Murray, S. S.; Garcia, M. R.; Barnard, R. +1 more
We identified a new X-ray transient CXOM31 004252.457+411631.17 (T13) in M31 during a 2013 June Chandra observation. This system is particularly exciting because it is located within 100'' of M31*; it is thought that this region of the bulge is sufficiently dense to form X-ray binaries dynamically, but only systems with black hole accretors and/or…
Multiwavelength Study of the Northeastern Outskirts of the Extended TeV Source HESS J1809-193
Pavlov, George G.; Kargaltsev, Oleg; Hare, Jeremy +3 more
HESS J1809-193 is an extended TeV γ-ray source in the Galactic plane. Multiwavelength observations of the HESS J1809-193 field reveal a complex picture. We present results from three Chandra X-Ray Observatory and two Suzaku observations of a region in the northeastern outskirts of HESS J1809-193, where enhanced TeV emission has been reported. Our …
X-Ray Detection of the Cluster Containing the Cepheid S Mus
Schaefer, Gail H.; Bond, Howard E.; Evans, Nancy Remage +7 more
The galactic Cepheid S Muscae has recently been added to the important list of Cepheids linked to open clusters, in this case the sparse young cluster ASCC 69. Low-mass members of a young cluster are expected to have rapid rotation and X-ray activity, making X-ray emission an excellent way to discriminate them from old field stars. We have made an…
A Fourier-transformed Bremsstrahlung Flash Model for the Production of X-Ray Time Lags in Accreting Black Hole Sources
Becker, Peter A.; Kroon, John J.
Accreting black hole sources show a wide variety of rapid time variability, including the manifestation of time lags during X-ray transients, in which a delay (phase shift) is observed between the Fourier components of the hard and soft spectra. Despite a large body of observational evidence for time lags, no fundamental physical explanation for t…