Search Publications
Case studies of the dynamics of ionospheric ions in the Earth's magnetotail
Lundin, R.; Sauvaud, J. -A.; Balogh, A. +19 more
This paper presents case studies of the dynamics of the terrestrial ions in the midplasma sheet and inside the lobes (∼17-19 RE). The high time resolution measurements of H+, He+, and O+ ions made on board Cluster show that these ions are massively injected into the tail during substorms/storms from the …
M31's Undisturbed Thin Disk of Globular Clusters
Harding, Paul; Morrison, Heather L.; Perrett, Kathy +1 more
We show that there is a subsystem of the M31 globular clusters with thin-disk kinematics. These clusters span the entire metallicity range of the M31 globular cluster system, in contrast to the (thick) disk globular clusters in the Milky Way, which are predominantly metal-rich. Disk globular clusters are found across the entire disk of M31 and for…
Fragmentation Hierarchy of Bright Sungrazing Comets and the Birth and Orbital Evolution of the Kreutz System. I. Two-Superfragment Model
Sekanina, Zdenek; Chodas, Paul W.
A back-and-forth orbit integration technique, developed for our previous investigation of the splitting of the parent of the sungrazers C/1882 R1 and C/1965 S1, is now applied in an effort to understand the history and orbital evolution of the Kreutz sungrazer system, starting with the birth of two subgroups, which show prominently among the brigh…
Transient Relativistically Shifted Lines as a Probe of Black Hole Systems
Turner, T. J.; Kraemer, S. B.; Reeves, J. N.
X-ray spectra of Seyfert galaxies have revealed a new type of X-ray spectral feature, one that appears to offer important new insight into the black hole system. XMM revealed several narrow emission lines redward of Fe Kα in NGC 3516. Since that discovery the phenomenon has been observed in other Seyfert galaxies, e.g., NGC 7314 and ESO 198-G24. W…
The X-Ray Jet of 3C 120: Evidence for a Nonstandard Synchrotron Spectrum
Harris, D. E.; Walker, R. C.; Mossman, A. E.
We report on archival data from the Chandra X-Ray Observatory for the radio jet of 3C 120. We consider the emission process responsible for the X-rays from four knots using spectra constructed from radio, optical, and X-ray intensities. While a simple synchrotron model is adequate for three of the knots, the fourth (``k25''), which was previously …
Jet emission in NGC 1052 at radio, optical, and X-ray frequencies
Pogge, R. W.; Kadler, M.; Kerp, J. +3 more
We present a combined radio, optical, and X-ray study of the nearby LINER galaxy NGC 1052. Data from a short (2.3 ks) CHANDRA observation of NGC 1052 reveal the presence of various jet-related X-ray emitting regions, a bright compact core and unresolved knots in the jet structure as well as an extended emitting region inside the galaxy well aligne…
Balmer and Metal Absorption Feature Gradients in M32
Worthey, Guy
New data sources are used to assess Lick/IDS feature strength gradients inside the half-light radius Re of the compact Local Group elliptical galaxy M32. A Hubble Space Telescope (HST) STIS spectrum seemed to indicate ionized gas and a very young central stellar population. In fact, this conclusion is entirely spurious because of incomp…
Line profile characteristics of solar explosive event bursts
Solanki, S. K.; Innes, D. E.; Ning, Z.
The spatial structure and temporal evolution of explosive events are explored using spectral observations of the Si IV 1393 Å line obtained with the Solar Ultraviolet Measurements of Emitted Radiation spectrograph (SUMER). Three areas of quiet Sun near disk center, 8 arcsec×120 arcsec each, were rastered with a cadence of less than 1 min for a per…
Molecular Gas around the Double Nucleus in M83
Iono, Daisuke; Matsushita, Satoki; Peck, Alison B. +2 more
The center of M83, a barred starburst galaxy with a double nucleus, has been observed in the CO (J=2-1) and CO (J=3-2) lines with the Submillimeter Array. The molecular gas shows a distribution and kinematics typical for barred galaxies at ~1 kpc radii but reveals unusual kinematics around the double nucleus in the central ~300 pc. Our CO velocity…
On the altitude dependence of transversely heated O distributions in the cusp/cleft
Klecker, B.; Rème, H.; Kistler, L. +5 more
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