Search Publications
Magnetosheath cavities: case studies using Cluster observations
Dandouras, I.; Kaymaz, Z.; Sibeck, D. G. +1 more
This paper presents examples of magnetosheath cavities in Cluster spacecraft observations. The cavities are accompanied by high energy particles in the magnetosheath and characterized by depressed magnetic fields and densities. Flow speeds decrease and temperatures increase within the cavities. All magnetosheath parameters show increased variabili…
Galaxy Clusters in the IRAC Dark Field. II. Mid-Infrared Sources
Surace, J. A.; Yan, L.; Krick, J. E. +4 more
We present infrared (IR) luminosities, star formation rates (SFR), colors, morphologies, locations, and active galactic nuclei (AGNs) properties of 24 µm detected sources in photometrically detected high-redshift clusters in order to understand the impact of environment on star formation (SF) and AGN evolution in cluster galaxies. We use thr…
The Spectral Energy Distributions of Red Two Micron All Sky Survey Active Galactic Nuclei
Wilkes, Belinda J.; McDowell, Jonathan C.; Schmidt, Gary +7 more
We present infrared (IR) to X-ray spectral energy distributions (SEDs) for 44 red active galactic nuclei (AGNs) selected from the Two Micron All Sky Survey (2MASS) survey on the basis of their red J - KS color (>2 mag) and later observed by Chandra. In comparison with optically-, radio-, and X-ray-selected AGNs, their median SEDs are…
Using HINODE/Extreme-Ultraviolet Imaging Spectrometer to Confirm a Seismologically Inferred Coronal Temperature
Marsh, M. S.; Walsh, R. W.
The Extreme-Ultraviolet Imaging Spectrometer on board the HINODE satellite is used to examine the loop system described in Marsh et al. by applying spectroscopic diagnostic methods. A simple isothermal mapping algorithm is applied to determine where the assumption of isothermal plasma may be valid, and the emission measure locii technique is used …
Gauging the Dark Matter Fraction in an L * S0 Galaxy at z = 0.47 Through Gravitational Lensing from Deep Hubble Space Telescope/Advanced Camera for Surveys Imaging
Kneib, J. -P.; Paolillo, M.; Jullo, E. +9 more
We analyze a new gravitational lens OAC-GL J1223-1239, serendipitously found in a deep I 814-band image of the Hubble Space Telescope (HST) Advanced Camera for Surveys (ACS). The lens is an L*, edge-on S0 galaxy at z l = 0.4656. The gravitational arc has a radius of 0farcs42 sime 1.74 h -1 kpc. We have determined t…
Spatial aliasing and distortion of energy distribution in the wave vector domain under multi-spacecraft measurements
Glassmeier, K. -H.; Narita, Y.
Aliasing is a general problem in the analysis of any measurements that make sampling at discrete points. Sampling in the spatial domain results in a periodic pattern of spectra in the wave vector domain. This effect is called spatial aliasing, and it is of particular importance for multi-spacecraft measurements in space. We first present the theor…
Groups of galaxies in AEGIS: the 200-ks Chandra extended X-ray source catalogue
Nandra, Kirpal; Davis, Marc; Willmer, Christopher N. A. +6 more
We present the discovery of seven X-ray emitting groups of galaxies selected as extended X-ray sources in the 200-ks Chandra coverage of the All-wavelength Extended Groth Strip International Survey (AEGIS). In addition, we report on active galactic nucleus (AGN) activity associated with these systems. For the six extended sources which lie within …
A multilayer model for thermal infrared emission of Saturn's rings: Basic formulation and implications for Earth-based observations
Ohtsuki, Keiji; Salo, Heikki; Morishima, Ryuji
We present our new model for the thermal infrared emission of Saturn's rings based on a multilayer approximation. In our model, (1) the equation of classical radiative transfer is solved directly for both visible and infrared light, (2) the vertical heterogeneity of spin frequencies of ring particles is taken into account, and (3) the heat transpo…
Swift GRB GRB071010B: Outlier of the E src peak - E γ and E iso - E src peak - t src jet Correlations
Yamaoka, Kazutaka; Ohno, Masanori; Sugita, Satoshi +12 more
We present multi-band results for GRB071010B based on Swift, Suzaku, and ground-based optical observations. This burst is an ideal target to evaluate the robustness of the E src peak - E iso and E src peak - E γ relations, whose studies have been in stagnation due to the lack of the…
Detection of the Central Star of the Planetary Nebula NGC 6302
Tsamis, Y. G.; Walsh, J. R.; Zijlstra, Albert A. +1 more
NGC 6302 is one of the highest ionization planetary nebulae (PNe) known and shows emission from species with ionization potential > 300 eV. The temperature of the central star must be > 200,000 K to photoionize the nebula, and has been suggested to be up to ~400,000 K. On account of the dense dust and molecular disk, the central star has not…