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Direction of the interstellar H atom inflow in the heliosphere: Role of the interstellar magnetic field
Izmodenov, V.; Alexashov, D.; Myasnikov, A.
Recently Lallement et al. (2005, Science, 307, 1447) reported that the direction of the flow of interstellar neutral hydrogen in the heliosphere is deflected by ~4° from the direction of the pristine local interstellar gas flow. The most probable physical phenomenon responsible for such a deviation is the interstellar magnetic field inclined to th…
Visibility of coronal mass ejections as a function of flare location and intensity
Howard, R. A.; Gopalswamy, N.; Michalek, G. +2 more
We report the visibility (detection efficiency) of coronal mass ejections (CMEs) of the Large Angle Spectrometric Coronagraph (LASCO) on board the Solar and Heliospheric Observatory (SOHO). We collected 1301 X-ray flare events (above C3 level) detected by the GOES satellite and examined their CME associations using data from LASCO coronagraphs. Th…
Compositional maps of Saturn's moon Phoebe from imaging spectroscopy
Sotin, C.; Baines, K. H.; Nicholson, P. D. +23 more
The origin of Phoebe, which is the outermost large satellite of Saturn, is of particular interest because its inclined, retrograde orbit suggests that it was gravitationally captured by Saturn, having accreted outside the region of the solar nebula in which Saturn formed. By contrast, Saturn's regular satellites (with prograde, low-inclination, ci…
The Evolution and Structure of Early-Type Field Galaxies: A Combined Statistical Analysis of Gravitational Lenses
Kochanek, C. S.; Rusin, D.
We introduce a framework for simultaneously investigating the structure and luminosity evolution of early-type gravitational lens galaxies. The method is based on the fundamental plane, which we interpret using the aperture mass-radius relations derived from lensed image geometries. We apply this method to our previous sample of 22 lens galaxies w…
Abundance trends in kinematical groups of the Milky Way's disk
Soubiran, C.; Girard, P.
We have compiled a large catalogue of metallicities and abundance ratios from the literature in order to investigate abundance trends of several alpha and iron peak elements in the thin disk and the thick disk of the Galaxy. The catalogue includes 743 stars with abundances of Fe, O, Mg, Ca, Ti, Si, Na, Ni and Al in the metallicity range -1.30 <…
Mapping the Kinematics of the Narrow-Line Region in the Seyfert Galaxy NGC 4151
Gull, T. R.; Kraemer, S. B.; Crenshaw, D. M. +6 more
Using the Hubble Space Telescope (HST) Space Telescope Imaging Spectrograph (STIS), observations of the [O III] emission from the narrow-line region (NLR) of NGC 4151 were obtained and radial velocities determined. Five orbits of HST time were used to obtain spectra at five parallel slit configurations at a position angle of 58°, with spatial reso…
Discovery of 10 µm silicate emission in quasars. Evidence of the AGN unification scheme
Siebenmorgen, R.; Schulz, B.; Haas, M. +1 more
According to the unified scheme, AGN are surrounded by a dust-torus, and the observed diversity of AGN properties results from the different orientations relative to our line of sight. The strong resonance of silicate dust at 10 µm is therefore, as expected, seen in absorption towards many type-2 AGN. In type-1 AGN, it should be seen in emis…
Spitzer imaging of i'-drop galaxies: old stars at z~ 6
Bunker, Andrew J.; Ellis, Richard S.; Stanway, Elizabeth R. +3 more
We present new evidence for mature stellar populations with ages >100Myr in massive galaxies (Mstellar > 1010Msolar) seen at a time when the Universe was less than 1Gyr old. We analyse the prominent detections of two z~ 6 star-forming galaxies (SBM03#1 and #3) made at wavelengths corresponding to the rest-fra…
Evidence from the Mars Express High Resolution Stereo Camera for a frozen sea close to Mars' equator
HRSC Co-Investigator Team; Head, James W.; van Gasselt, Stephan +10 more
It is thought that the Cerberus Fossae fissures on Mars were the source of both lava and water floods two to ten million years ago. Evidence for the resulting lava plains has been identified in eastern Elysium, but seas and lakes from these fissures and previous water flooding events were presumed to have evaporated and sublimed away. Here we pres…
Can the Steep Mass Profile of A1689 Be Explained by a Triaxial Dark Halo?
Broadhurst, Tom; Oguri, Masamune; Umetsu, Keiichi +1 more
The steep mass profile of A1689 derived from recent detailed lensing observations is not readily reconciled with the low-concentration halos predicted by the standard cold dark matter (CDM) model. However, halo triaxiality may act to bias the profile constraints derived assuming a spherically symmetric mass distribution, since lensing relates only…