Search Publications
Dynamics of Saturn's Magnetosphere from MIMI During Cassini's Orbital Insertion
Livi, S.; Hsieh, K. C.; Krupp, N. +29 more
The Magnetospheric Imaging Instrument (MIMI) onboard the Cassini spacecraft observed the saturnian magnetosphere from January 2004 until Saturn orbit insertion (SOI) on 1 July 2004. The MIMI sensors observed frequent energetic particle activity in interplanetary space for several months before SOI. When the imaging sensor was switched to its energ…
Evolution of the Near-Infrared Tully-Fisher Relation: Constraints on the Relationship between the Stellar and Total Masses of Disk Galaxies since z~1
Conselice, Christopher J.; Ellis, Richard S.; Bundy, Kevin +3 more
Using a combination of Keck spectroscopy and near-infrared imaging, we investigate the K-band and stellar-mass Tully-Fisher relation for 101 disk galaxies at 0.2<z<1.2, with the goal of placing the first observational constraints on the assembly history of halo and stellar mass. Our main result is a lack of evolution in either the K-band or …
From Radio to X-Ray: Flares on the dMe Flare Star EV Lacertae
Hawley, Suzanne L.; Johns-Krull, Christopher M.; Osten, Rachel A. +2 more
We present the results of a campaign to observe flares on the M dwarf flare star EV Lacertae over the course of two days in 2001 September, utilizing a combination of radio continuum, optical photometric and spectroscopic, ultraviolet spectroscopic, and X-ray spectroscopic observations to characterize the multiwavelength nature of flares from this…
The CME-flare relationship: Are there really two types of CMEs?
Vršnak, B.; Sudar, D.; Ruždjak, D.
We present a statistical analysis of 545 flare-associated CMEs and 104 non-flare CMEs observed in the heliocentric distance range 2-30 solar radii. We found that both data sets show quite similar characteristics, contradicting the concept of two distinct (flare/non-flare) types of CMEs. In both samples there is a significant fraction of CMEs showi…
The Low End of the Supermassive Black Hole Mass Function: Constraining the Mass of a Nuclear Black Hole in NGC 205 via Stellar Kinematics
Joseph, Charles L.; Ferrarese, Laura; Merritt, David +1 more
Hubble Space Telescope (HST) images and spectra of the nucleated dwarf elliptical galaxy NGC 205 are combined with three-integral axisymmetric dynamical models to constrain the mass MBH of a putative nuclear black hole. This is only the second attempt, after M33, to use resolved stellar kinematics to search for a nuclear black hole with…
An Overdensity of Galaxies at z = 5.9 +/- 0.2 in the Hubble Ultra Deep Field Confirmed Using the ACS Grism
Daddi, E.; Panagia, N.; Ferguson, H. C. +17 more
We present grism spectra taken with the Advanced Camera for Surveys (ACS) to identify 29 red sources with (i775-z850)>=0.9 in the Hubble Ultra Deep Field (HUDF). Of these, 23 are found to be galaxies at redshifts between z=5.4 and 6.7, identified by the break at 1216 Å due to intergalactic medium (IGM) absorption; two are …
Dimensional analysis of observed structures using multipoint magnetic field measurements: Application to Cluster
Balogh, A.; Zhang, H.; Zong, Q. -G. +6 more
A new method is described to analyze the dimensional character of observed structures using multipoint magnetic field measurements of four or more spacecraft. The technique can provide three directions along which the magnetic field has the minimum, intermediate, and maximum derivatives if the magnetic gradient tensor G = $\nabla$$\vec{B at every …
INTEGRAL insight into the inner parts of the Galaxy. High mass X-ray binaries
Sunyaev, R.; Revnivtsev, M.; Lutovinov, A. +3 more
Since its launch INTEGRAL has devoted a significant fraction of its observing time to the Galactic plane region. We present the results of INTEGRAL observations of the inner spiral arms of the Galaxy (Norma, Scutum and Sagittarius) with attention to high mass X-ray binaries. The increased sensitivity of the survey and possibility to detect absorbe…
Hierarchical star formation in M 51: star/cluster complexes
Bastian, N.; Gieles, M.; Lamers, H. J. G. L. M. +1 more
We report on a study of young star cluster complexes in the spiral galaxy M 51. Recent studies have confirmed that star clusters do not form in isolation, but instead tend to form in larger groupings or complexes. We use HST broad and narrow band images (from both WFPC2 and ACS), along with BIMA-CO observations to study the properties and investig…
The lithium content of the Galactic Halo stars
Primas, F.; Charbonnel, C.
Thanks to the accurate determination of the baryon density of the universe by the recent cosmic microwave background experiments, updated predictions of the standard model of Big Bang nucleosynthesis now yield the initial abundance of the primordial light elements with unprecedented precision. In the case of ^7Li, the CMB+SBBN value is significant…