Science Archives Publication System

Young Super Star Clusters in the Starburst of M82: The Catalog

DOI: 10.1086/426421 Bibcode: 2005ApJ...619..270M

Tenorio-Tagle, G.; Melo, V. P.; Muñoz-Tuñón, C. +1 more

Recent results from the Hubble Space Telescope (HST) have resolved starbursts as collections of compact young stellar clusters. Here we present a photometric catalog of the young stellar clusters in the nuclear starburst of M82, observed with the HST WFPC2 in Hα (F656N) and in four optical broadband filters. We identify 197 young super stellar clu…

2005 • The Astrophysical Journal

eHST 78

The Ne/O abundance ratio in the quiet Sun

DOI: 10.1051/0004-6361:200500206 Bibcode: 2005A&A...444L..45Y

Young, P. R.

Context: .
Aims: .To determine the neon-to-oxygen abundance in the quiet Sun, a proxy for the photospheric abundance ratio.
Methods: .An emission measure method applied to extreme ultraviolet emission lines of Ne iv-vi and O iii-v ions observed by the Coronal Diagnostic Spectrometer on the SOHO satellite.
Results: .The average Ne/O abu…

2005 • Astronomy and Astrophysics

SOHO 78

Rapid Penumbral Decay Associated with an X2.3 Flare in NOAA Active Region 9026

DOI: 10.1086/428821 Bibcode: 2005ApJ...623.1195D

Liu, Chang; Yang, Guo; Denker, Carsten +2 more

We present observations of rapid penumbral decay associated with a major flare in solar NOAA Active Region 9026 on 2000 June 6. Within 1.5 hr, an X2.3 flare accompanied by an 11° long filament eruption and a full-halo coronal mass ejection (CME) originated near the neutral line of a large δ-spot region, which was associated with significant change…

2005 • The Astrophysical Journal

SOHO 78

INTEGRAL spectroscopy of the accreting millisecond pulsar XTE J1807-294 in outburst

DOI: 10.1051/0004-6361:20042575 Bibcode: 2005A&A...436..647F

Goldoni, P.; Bonnet-Bidaud, J. M.; Kuiper, L. +6 more

The transient X-ray accreting millisecond pulsar XTE J1807-294 was observed during its February/March 2003 outburst by INTEGRAL, partly simultaneously with the XMM-Newton and RXTE satellites. We present here the first study of the 0.5-200 keV broad-band spectra of the source. On February 28, the source spectrum was consistent with thermal Comptoni…

2005 • Astronomy and Astrophysics

INTEGRAL XMM-Newton 78

Characterizing a new class of variability in GRS 1915+105 with simultaneous INTEGRAL/RXTE observations

DOI: 10.1051/0004-6361:20042250 Bibcode: 2005A&A...435..995H

Belloni, T.; Rodriguez, J.; Mirabel, I. F. +14 more

We report on the analysis of 100 ks INTEGRAL observations of the Galactic microquasar GRS 1915+105. We focus on INTEGRAL Revolution number 48 when the source was found to exhibit a new type of variability as preliminarily reported in Hannikainen (2003, A&A, 411, L415). The variability pattern, which we name ξ, is characteriz…

2005 • Astronomy and Astrophysics

INTEGRAL 77

Ice Age Epochs and the Sun's Path through the Galaxy

DOI: 10.1086/430250 Bibcode: 2005ApJ...626..844G

Gies, D. R.; Helsel, J. W.

We present a calculation of the Sun's motion through the Milky Way over the last 500 million yr. The integration is based on estimates of the Sun's current position and speed from measurements with Hipparcos and on a realistic model for the Galactic gravitational potential. We estimate the times of the Sun's past spiral arm crossings for a range o…

2005 • The Astrophysical Journal

Hipparcos 77

Saturn's cloud structure and temporal evolution from ten years of Hubble Space Telescope images (1994 2003)

DOI: 10.1016/j.icarus.2005.01.014 Bibcode: 2005Icar..176..155P

Sánchez-Lavega, A.; Rojas, J. F.; Pérez-Hoyos, S. +1 more

We present a study of the vertical structure of clouds and hazes in the upper atmosphere of Saturn's Southern Hemisphere during 1994-2003, about one third of a Saturn year, based on Hubble Space Telescope images. The photometrically calibrated WFPC2 images cover the spectral region between the near-UV (218-255 nm) and the near-IR (953-1042 nm), in…

2005 • Icarus

eHST 77

Initiation of hot coronal loop oscillations: Spectral features

DOI: 10.1051/0004-6361:20052680 Bibcode: 2005A&A...435..753W

Solanki, S. K.; Curdt, W.; Innes, D. E. +1 more

We explore the excitation of hot loop oscillations observed with the SUMER spectrograph on SOHO by analysing Fe XIX and Fe XXI spectral line profiles in the initial phase of the events. We investigate all 54 Doppler shift oscillations in 27 flare-like events, whose physical parameters have been measured so far. In nearly 50% of the cases, the spec…

2005 • Astronomy and Astrophysics

SOHO 77

Kinetic vs. multi-fluid models of H atoms in the heliospheric interface: a comparison

DOI: 10.1051/0004-6361:20052821 Bibcode: 2005A&A...439.1171A

Izmodenov, V.; Alexashov, D.

The goal of this paper is to illuminate similarities and differences in the kinetic and multi-fluid models of the heliospheric interface, the region of solar wind interaction with the Local Interstellar Cloud (LIC), and then to explore physical reasons for these differences. We present a detailed comparison of two types of models. The first type i…

2005 • Astronomy and Astrophysics

SOHO 77

Global cooling and densification of the plasma sheet during an extended period of purely northward IMF on October 22-24, 2003

DOI: 10.1029/2004GL021523 Bibcode: 2005GeoRL..3212S07O

Wing, S.; Balogh, A.; Fujimoto, M. +6 more

The October 22-24, 2003 interplanetary magnetic cloud was characterized by an exceptionally long interval (~32 hours) of nearly purely northward interplanetary magnetic field (IMF). Following the northward IMF turning Cluster observed a gradual transition to a cold (<1 keV) and dense (~1-2 cm^-3) plasma sheet (CDPS). Cluster observed …

2005 • Geophysical Research Letters

Cluster 77