Search Publications
Galaxy Clusters at the Edge: Temperature, Entropy, and Gas Dynamics Near the Virial Radius
O'Shea, Brian W.; Burns, Jack O.; Skillman, Samuel W.
Recently, Suzaku has produced temperature and entropy profiles, along with profiles of gas density, gas fraction, and mass, for multiple galaxy clusters out to approximately the virial radius. In this paper, we compare these novel X-ray observations with results from N-body + hydrodynamic adaptive mesh refinement cosmological simulations using the…
Toward a Realistic Thermodynamic Magnetohydrodynamic Model of the Global Solar Corona
Lugaz, Noé; Downs, Cooper; Roussev, Ilia I. +3 more
In this work, we describe our implementation of a thermodynamic energy equation into the global corona model of the Space Weather Modeling Framework and its development into the new lower corona (LC) model. This work includes the integration of the additional energy transport terms of coronal heating, electron heat conduction, and optically thin r…
Evolution of Titan's rocky core constrained by Cassini observations
Lunine, Jonathan I.; Castillo-Rogez, Julie C.
We model the thermal evolution of Titan's core and search for solutions that are consistent with the mean moment of inertia yielded by the Cassini-Huygens Mission. Like previous studies we assume that Titan's core is enriched in hydrated silicates. However, our modeling accounts for the possible dehydration of these minerals. The resulting models …
Magnetospheric period oscillations at Saturn: Comparison of equatorial and high-latitude magnetic field periods with north and south Saturn kilometric radiation periods
Coates, A. J.; Dougherty, M. K.; Lamy, L. +4 more
It has recently been shown using Cassini radio data that Saturn kilometric radiation (SKR) emissions from the Northern and Southern hemispheres of Saturn are modulated at distinctly different periods, ∼10.6 h in the north and ∼10.8 h in the south, during the southern summer conditions that prevailed during the interval from 2004 to near-equinox in…
Carbon dioxide on the satellites of Saturn: Results from the Cassini VIMS investigation and revisions to the VIMS wavelength scale
Nicholson, Philip D.; Baines, Kevin H.; Buratti, Bonnie J. +15 more
Several of the icy satellites of Saturn show the spectroscopic signature of the asymmetric stretching mode of C-O in carbon dioxide (CO 2) at or near the nominal solid-phase laboratory wavelength of 4.2675 µm (2343.3 cm -1), discovered with the Visible-Infrared Mapping Spectrometer (VIMS) on the Cassini spacecraft. We r…
z ~ 7 Galaxy Candidates from NICMOS Observations Over the HDF-South and the CDF-South and HDF-North Goods Fields
Conselice, Christopher J.; Franx, Marijn; Illingworth, Garth D. +9 more
We use ~88 arcmin2 of deep (gsim26.5 mag at 5σ) NICMOS data over the two GOODS fields and the HDF-South to conduct a search for bright z >~ 7 galaxy candidates. This search takes advantage of an efficient preselection over 58 arcmin2 of NICMOS H 160-band data where only plausible z >~ 7 candidates are followe…
Cavities and Shocks in the Galaxy Group HCG 62 as Revealed by Chandra, XMM-Newton, and Giant Metrewave Radio Telescope Data
Raychaudhury, Somak; Giacintucci, Simona; David, Laurence P. +4 more
We report on the results of an analysis of Chandra, XMM-Newton, and new Giant Metrewave Radio Telescope (GMRT) data of the X-ray bright compact group of galaxies HCG 62, which is one of the few groups known to possess clear, small X-ray cavities in the inner regions. This is part of an ongoing X-ray/low-frequency radio study of 18 groups, initiall…
Galaxy-Scale Strong-Lensing Tests of Gravity and Geometric Cosmology: Constraints and Systematic Limitations
Rappaport, Saul A.; Bolton, Adam S.; Schwab, Josiah
Galaxy-scale strong gravitational lenses with measured stellar velocity dispersions allow a test of the weak-field metric on kiloparsec scales and a geometric measurement of the cosmological distance-redshift relation, provided that the mass-dynamical structure of the lensing galaxies can be independently constrained to a sufficient degree. We com…
The Palermo Swift-BAT hard X-ray catalogue. II. Results after 39 months of sky survey
Campana, S.; Tagliaferri, G.; Cusumano, G. +12 more
Aims: We present the Palermo Swift-BAT hard X-ray catalogue obtained from the analysis of data acquired during the first 39 months of the Swift mission.
Methods: We developed a dedicated software to perform the data reduction, mosaicking, and source detection of the BAT survey data. We analyzed the BAT dataset in three energy bands (14-1…
Probing the molecular interstellar medium of M82 with Herschel-SPIRE spectroscopy
Elbaz, D.; Pérez-Fournon, I.; Bock, J. J. +60 more
We present the observations of the starburst galaxy M82 taken with the Herschel SPIRE Fourier-transform spectrometer. The spectrum (194-671 µm) shows a prominent CO rotational ladder from J = 4-3 to 13-12 emitted by the central region of M82. The fundamental properties of the gas are well constrained by the high J lines observed for the firs…