Search Publications
Spitzer Space Telescope Observations of Kepler's Supernova Remnant: A Detailed Look at the Circumstellar Dust Component
Blair, William P.; Reynolds, Stephen P.; Ghavamian, Parviz +4 more
We present 3.6-160 µm infrared images of Kepler's supernova remnant (SN 1604) obtained with the IRAC and MIPS instruments on the Spitzer Space Telescope. We also present MIPS SED low-resolution spectra in the 55-95 µm region. The observed emission in the MIPS 24 µm band shows the entire shell. Emission in the MIPS 70 µm and…
Near-infrared spectral mapping of Titan's mountains and channels
Sotin, Christophe; Barnes, Jason W.; Rodriguez, Sebastien +17 more
We investigate the spectral reflectance properties of channels and mountain ranges on Titan using data from Cassini's Visual and Infrared Mapping Spectrometer (VIMS) obtained during the T9 encounter (26 December 2005). We identify the location of channels and mountains using synthetic aperture radar maps obtained from Cassini's RADAR instrument du…
Observations of Sunspot Oscillations in G Band and CaII H Line with Solar Optical Telescope on Hinode
Tsuneta, Saku; Shimizu, Toshifumi; Kosovichev, Alexander G. +11 more
Exploiting high-resolution observations made by the Solar Optical Telescope on board Hinode, we investigate the spatial distribution of the power spectral density of the oscillatory signal in and around the active region NOAA 10935. The G-band data show that in the umbra the oscillatory power is suppressed in all frequency ranges. On the other han…
Dependence of Galaxy Structure on Rest-Frame Wavelength and Galaxy Type
Conselice, Christopher J.; Windhorst, Rogier A.; Jansen, Rolf A. +1 more
We present a quantitative analysis of the morphologies for 199 nearby galaxies as parameterized with measurements of the concentration, asymmetry, and clumpiness (CAS) parameters at wavelengths from 0.15 to 0.85 µm. We find that these CAS parameters depend on both galaxy type and the wavelength of observation. As such, we use them to obtain …
IGR J18483-0311: an accreting X-ray pulsar observed by INTEGRAL
Hill, A. B.; Masetti, N.; Bird, A. J. +8 more
Context: IGR J18483-0311 is a poorly known transient hard X-ray source discovered by INTEGRAL during observations of the Galactic Center region performed between 23-28 April 2003.
Aims: To detect new outbursts from IGR J18483-0311 using INTEGRAL and archival Swift XRT observations and finally to characterize the nature of this source using the…
Modelling mid-Z element atmospheres for strongly magnetized neutron stars
Mori, Kaya; Ho, Wynn C. G.
We construct models for strongly magnetized neutron star atmospheres composed of mid-Z elements (carbon, oxygen and neon) with magnetic fields B = 1012-1013 G and effective temperatures Teff = (1 - 5) × 106 K; this is done by first addressing the physics relevant to strongly magnetized plasmas and calcul…
Magnetic Field Strength in the Solar Corona from Type II Band Splitting
Cho, K. -S.; Moon, Y. -J.; Gary, D. E. +2 more
The phenomenon of band splitting in type II bursts can be a unique diagnostic for the magnetic field in the corona, which is, however, inevitably sensitive to the ambient density. We apply this diagnostic to the CME-flare event on 2004 August 18, for which we are able to locate the propagation of the type II burst and determine the ambient coronal…
Relativistic Iron K Emission and Absorption in the Seyfert 1.9 Galaxy MCG -5-23-16
Ptak, A.; Nandra, K.; Turner, T. J. +9 more
We present the results of the simultaneous deep XMM-Newton and Chandra observations of the bright Seyfert 1.9 galaxy MCG -5-23-16, which is thought to have one of the best known examples of a relativistically broadened iron Kα line. The time-averaged spectral analysis shows that the iron K-shell complex is best modeled with an unresolved narrow em…
Determination of the Coronal Magnetic Field from Hot-Loop Oscillations Observed by SUMER and SXT
Qiu, Jiong; Innes, Davina E.; Wang, Tongjiang
We apply a new method to determine the magnetic field in coronal loops, using observations of coronal loop oscillations. We analyze seven Doppler-shift oscillation events detected by SUMER in the hot flare line Fe XIX to obtain the oscillation periods of these events. The geometry, temperature, and electron density of the oscillating loops are mea…
The DEEP2 Galaxy Redshift Survey: AEGIS Observations of a Dual AGN at z = 0.7
Barmby, P.; Ivison, R. J.; Weiner, Benjamin J. +15 more
We present evidence of a dual active galactic nucleus (AGN) within an early-type galaxy at z=0.709 in the extended Groth strip. The galaxy lies on the red sequence, with absolute magnitude MB=-21.0 (AB, with h=0.7) and rest-frame color U-B=1.38. Its optical spectrum shows strong, double-peaked [O III] emission lines and weak Hβ emission…