Search Publications
Warm Gas in the Inner Disks around Young Intermediate-Mass Stars
Simon, Theodore; Najita, Joan R.; Rettig, Terrence W. +1 more
The characterization of gas in the inner disks around young stars is of particular interest because of its connection to planet formation. In order to study the gas in inner disks, we have obtained high-resolution K- and M-band spectroscopy of 14 intermediate-mass young stars. In sources that have optically thick inner disks, i.e., E(K-L)>1, ou…
Multi-point observations of the Hall electromagnetic field and secondary island formation during magnetic reconnection
Balogh, A.; Dandouras, I.; Eastwood, J. P. +7 more
A key feature of collisionless magnetic reconnection is the formation of Hall magnetic and electric field structure in the vicinity of the diffusion region. Here we present multi-point Cluster observations of a reconnection event in the near-Earth magnetotail where the diffusion region was nested by the Cluster spacecraft; we compare observations …
Candidate tidal disruption events from the XMM-Newton slew survey
Altieri, B.; Sanchez-Portal, M.; Read, A. M. +4 more
Context: In recent years, giant amplitude X-ray flares have been observed from a handful of non-active galaxies. The most plausible scenario of these unusual phenomena is tidal disruption of a star by a quiescent supermassive black hole at the centre of the galaxy.
Aims: Only a small number of these type of events have been observed and confir…
The properties and evolution of a K-band selected sample of massive galaxies at z ~ 0.4-2 in the Palomar/DEEP2 survey
Papovich, C.; Georgakakis, A.; Nandra, K. +11 more
We present the results of a study on the properties and evolution of massive (M* > 1011Msolar) galaxies at z ~ 0.4-2 utilizing Keck spectroscopy, near-infrared Palomar imaging, and Hubble, Chandra and Spitzer data covering fields targeted by the DEEP2 galaxy spectroscopic survey. Our sample is K-band selected an…
Mountains on Titan observed by Cassini RADAR
Cassini RADAR Team; Kirk, Randolph L.; Lorenz, Ralph D. +5 more
The Cassini Titan Radar mapper has observed elevated blocks and ridge-forming block chains on Saturn's moon Titan demonstrating high topography we term "mountains." Summit flanks measured from the T3 (February 2005) and T8 (October 2005) flybys have a mean maximum slope of 37° and total elevations up to 1930 m as derived from a shape-from-shading …
The Prelude to and Aftermath of the Giant Flare of 2004 December 27: Persistent and Pulsed X-Ray Properties of SGR 1806-20 from 1993 to 2005
Hurley, Kevin; Kouveliotou, Chryssa; Göǧüş, Ersin +5 more
We report on the evolution of key spectral and temporal parameters of SGR 1806-20 prior to and following the highly energetic giant flare of 2004 December 27. Using RXTE, we track the pulse frequency of the SGR and find that the spin-down rate varied erratically in the months before and after the flare. Contrary to the giant flare in SGR 1900+14, …
TeV light curve of PSR B1259-63/SS2883
Aharonian, F.; Khangulyan, D.; Hnatic, S. +1 more
The inverse Compton (IC) scattering of ultrarelativistic electrons accelerated at the pulsar wind termination shock is generally believed to be responsible for TeV gamma-ray signal recently reported from the binary system PSR B1259-63/SS2883. While this process can explain the energy spectrum of the observed TeV emission, the gamma-ray fluxes dete…
Near-Infrared and Mid-Infrared Spectroscopy with the Infrared Camera (IRC) for AKARI
Pearson, C. P.; Ohyama, Y.; Takagi, T. +22 more
The Infrared Camera (IRC) is one of the two instruments on board the AKARI satellite. In addition to deep imaging from 1.8 to 26.5 ×
Evolution of the Luminosity Function, Star Formation Rate, Morphology, and Size of Star-forming Galaxies Selected at Rest-Frame 1500 and 2800 Å
Dickinson, Mark; Ferguson, Henry C.; Giavalisco, Mauro +4 more
Using the multiwavelength photometric and spectroscopic data covering the Chandra Deep Field South obtained within the Great Observatories Origins Deep Survey, we investigate the rest-frame UV properties of galaxies to z~2.2, including the evolution of the luminosity function, the luminosity density, star formation rate (SFR), and galaxy morpholog…
Solar Magnetic Tracking. I. Software Comparison and Recommended Practices
Lamb, D. A.; DeForest, C. E.; Hagenaar, H. J. +2 more
Feature tracking and recognition are increasingly common tools for data analysis, but are typically implemented on an ad hoc basis by individual research groups, limiting the usefulness of derived results when selection effects and algorithmic differences are not controlled. Specific results that are affected include the solar magnetic turnover ti…