Science Archives Publication System

Evidence of Enceladus and Tethys microsignatures

DOI: 10.1029/2005GL024072 Bibcode: 2005GeoRL..3220101P

Livi, S.; Krupp, N.; Woch, J. +7 more

We present evidence of two icy satellite microsignatures in the Cassini LEMMS data. Just upstream of Enceladus, a deep and narrow decrease in the flux of several MeV electrons is consistent with a recent absorption by that moon. This microsignature is collocated with a deep depletion in the MeV proton flux. The proton feature is much wider than th…

2005 • Geophysical Research Letters

Cassini 25

Planetary science: Huygens rediscovers Titan

DOI: 10.1038/438756a Bibcode: 2005Natur.438..756O

Owen, Tobias

The first analyses of data sent by the Huygens probe from Saturn's largest moon Titan are flooding in. They paint a picture of a `Peter Pan' world - potentially like Earth, but with its development frozen at an early stage.

2005 • Nature

Huygens 25

Effect of a Converging Flow at the Streamer Cusp on the Genesis of the Slow Solar Wind

DOI: 10.1086/429262 Bibcode: 2005ApJ...624.1049L

Lapenta, Giovanni; Knoll, D. A.

The observation by the Large Angle and Spectrometric Coronagraph (LASCO) instrument on the Solar and Heliospheric Observatory of blobs of plasma generated near the cusp region of the streamer belt has sparked the hope of gaining new insight into the genesis of the slow solar wind. The observations suggest that open and closed field lines reconnect…

2005 • The Astrophysical Journal

SOHO 25

Cassini CIRS Observations of a Roll-Off in Saturn Ring Spectra at Submillimeter Wavelengths

DOI: 10.1007/s11038-005-9060-8 Bibcode: 2005EM&P...96..149S

Edgington, S. G.; Spilker, L. J.; Pilorz, S. H. +4 more

The Cassini Composite Infrared Spectrometer (CIRS) spatially resolved Saturn's main rings in the far-infrared, measuring the spectrum from 20 to 400 wavenumbers (cm^‑1) (tens of microns to submillimeter wavelengths). We find a spectral roll-off below 50 cm^‑1 (200 µm) for each of the A, B and C rings. From these data we d…

2005 • Earth Moon and Planets

Cassini 25

Mesoscale flows in large aspect ratio simulations of turbulent compressible convection

DOI: 10.1051/0004-6361:200400130 Bibcode: 2005A&A...430L..57R

Rieutord, M.; Rincon, F.; Lignières, F.

We present the results of a very large aspect ratio (A=42.6) numerical simulation of fully compressible turbulent convection in a polytropic atmosphere, and focus on the properties of large-scale flows. Mesoscale patterns dominate the turbulent energy spectrum. We show that these structures, which had already been observed in Boussinesq simulation…

2005 • Astronomy and Astrophysics

SOHO 25

A Statistical Study of the Correlation between Magnetic Helicity Injection and Soft X-Ray Activity in Solar Active Regions

DOI: 10.1086/426806 Bibcode: 2005ApJ...620.1069M

Kusano, K.; Sakurai, T.; Yokoyama, T. +1 more

The correlation between magnetic helicity injection across the photosphere and soft X-ray activity in the solar corona is statistically investigated for seven active regions appearing in the years 1997-2000. The magnetic helicity flux into the solar corona is analyzed by the induction equation method, using magnetograms observed by the Michelson D…

2005 • The Astrophysical Journal

SOHO 25

The Discovery of a High-Redshift X-Ray-Emitting QSO Very Close to the Nucleus of NGC 7319

DOI: 10.1086/426886 Bibcode: 2005ApJ...620...88G

Zibetti, Stefano; Burbidge, E. M.; Galianni, Pasquale +3 more

A strong X-ray source only 8" from the nucleus of the Seyfert 2 galaxy NGC 7319 in Stephan's Quintet has been discovered by Chandra. We have identified the optical counterpart and show that it is a QSO with z_e=2.114. It is also an ultraluminous X-ray source with L_X=1.5×10⁴⁰ ergs s^-1. From the optical spe…

2005 • The Astrophysical Journal

eHST 25

The XMM-Newton view of three X-ray weak quasars: Iron emission and strong ionized absorption

DOI: 10.1051/0004-6361:20041802 Bibcode: 2005A&A...433..455S

Clavel, J.; Guainazzi, M.; Schartel, N. +4 more

We present the analysis of XMM-Newton observations of three X-ray weak quasars: PG 1001+054, PG 1535+547 and PG 2112+059. All objects are absorbed by ionized material showing high column densities, N_H = 2.9 × 10²²~cm^-2 to N_H = 1.9 × 10²³~cm^-2, and ionization parameters, ξ = 147 ~erg…

2005 • Astronomy and Astrophysics

IUE XMM-Newton 25

Predicted and Empirical Radii of RR Lyrae Stars

DOI: 10.1086/430273 Bibcode: 2005ApJ...623L.133M

Marconi, M.; Bono, G.; Caputo, F. +2 more

We present new theoretical period-radius-metallicity relations for RR Lyrae stars. Current predictions are based on a large set of nonlinear, convective models that cover a broad range of chemical abundances and input parameters. We also provide new and homogeneous estimates of angular diameters for a sample of field RR Lyrae stars using a recent …

2005 • The Astrophysical Journal

eHST 25

To Be or Not to Be: Very Young Globular Clusters in M31

DOI: 10.1086/498649 Bibcode: 2005ApJ...634L..45C

Matthews, Keith; Cohen, Judith G.; Cameron, P. Brian

We present observations made with the newly commissioned Keck laser guide star adaptive optics (LGSAO) system of six objects in M31 that are alleged in multiple recent studies to be young globular clusters (GCs); all are supposed to have ages <=5 Gyr. The resulting FWHM of the PSF core in our images is ~70 mas. The four youngest of these object…

2005 • The Astrophysical Journal

eHST 25