Science Archives Publication System

The Small Magellanic Cloud in the far infrared. II. Global properties

DOI: 10.1051/0004-6361:20034113 Bibcode: 2004A&A...414...69W

Lemke, D.; Klaas, U.; Haas, M. +3 more

We present global IR properties of the Small Magellanic Cloud using an ISOPHOT 170 µm map and re-visited IRAS data. The integrated 170 µm flux is 14 950 ± 2300 Jy, and the integrated IR flux is F_1-1000 = 7.48 × 10^-10 W m^-2. Discrete sources contribute 28%, 29%, and 36% to the integrated flux at 60 &micr…

2004 • Astronomy and Astrophysics

ISO 56

Discovery of optically faint obscured quasars with Virtual Observatory tools

DOI: 10.1051/0004-6361:20041153 Bibcode: 2004A&A...424..545P

Rosati, P.; Walton, N. A.; Padovani, P. +1 more

We use Virtual Observatory (VO) tools to identify optically faint, obscured (i.e., type 2) active galactic nuclei (AGN) in the two Great Observatories Origins Deep Survey (GOODS) fields. By employing publicly available X-ray and optical data and catalogues we discover 68 type 2 AGN candidates. The X-ray powers of these sources are estimated by usi…

2004 • Astronomy and Astrophysics

eHST 56

Motions of Flare Ribbons and Loops in Various Magnetic Configurations

DOI: 10.1023/B:SOLA.0000036875.14102.39 Bibcode: 2004SoPh..222..115L

Lin, Jun

Kopp-Pneuman-type magnetic configurations, which include a vertical current sheet, with various background fields are investigated. Dissipation of the current sheet as a result of magnetic reconnection produces bright flare ribbons on the solar disk and a growing flare loop system in the corona. In principle, the growth of flare loop system is gov…

2004 • Solar Physics

SOHO 56

Diffraction-limited bispectrum speckle interferometry of the nuclear region of the Seyfert galaxy NGC 1068 in the H and K' bands

DOI: 10.1051/0004-6361:20040362 Bibcode: 2004A&A...425...77W

Duschl, W. J.; Weigelt, G.; Hofmann, K. -H. +5 more

We present near-infrared bispectrum speckle interferometry studies of the nuclear region of the Seyfert 2 galaxy NGC 1068. A diffraction-limited K'-band image with 74 mas resolution and the first H-band image with 57 mas resolution were reconstructed from speckle interferograms obtained with the SAO 6 m telescope. The resolved s…

2004 • Astronomy and Astrophysics

eHST 56

X-Raying A2125: A Large-Scale Hierarchical Complex of Galaxies and Hot Gas

DOI: 10.1086/422332 Bibcode: 2004ApJ...611..821W

Wang, Q. Daniel; Owen, Frazer; Ledlow, Michael

We present an 82 ks Chandra ACIS-I observation of a large-scale hierarchical complex, which consists of various clusters/groups of galaxies and low surface brightness X-ray emission at z=0.247. This high-resolution Chandra observation allows us for the first time to separate unambiguously the X-ray contributions from discrete sources and large-sca…

2004 • The Astrophysical Journal

eHST 56

Molecular gas in NUclei of GAlaxies (NUGA). II. The ringed LINER NGC 7217

DOI: 10.1051/0004-6361:20031664 Bibcode: 2004A&A...414..857C

Tacconi, L. J.; Hunt, L. K.; Schinnerer, E. +8 more

We present CO(1-0) and CO(2-1) maps of the LINER galaxy NGC 7217, obtained with the IRAM interferometer, at 2.4 arcsec×1.9 arcsec and 1.2 arcsec×0.8 arcsec resolution respectively. The nuclear ring (at r=12 arcsec=0.8 kpc) dominates the CO maps, and has a remarkable sharp surface density gradient at its inner edge. The latter is the site of the st…

2004 • Astronomy and Astrophysics

eHST 56

A thorough study of the intriguing X-ray emission from the Cartwheel ring

DOI: 10.1051/0004-6361:20047110 Bibcode: 2004A&A...426..787W

Wolter, A.; Trinchieri, G.

We present the results from the high resolution Chandra observation of the Cartwheel galaxy. Many individual sources are resolved in the image, mostly associated with the outer ring. All detected sources have a very high X-ray luminosity (≥ 10³⁹ erg s^-1) that classifies them as Ultra Luminous X-ray sources …

2004 • Astronomy and Astrophysics

eHST 55

Thin electron-scale layers at the magnetopause

DOI: 10.1029/2003GL018137 Bibcode: 2004GeoRL..31.3803A

Fazakerley, A. N.; André, M.; Vaivads, A. +2 more

We use data from the four Cluster satellites to examine the microphysics of a thin electron-scale layer discovered on the magnetospheric side of the magnetopause. Here the ion and electron motions are decoupled in a layer about 20 km (a few electron scales) wide, including currents and strong electric fields. In this layer the electrons are E × B …

2004 • Geophysical Research Letters

Cluster 55

Coronal versus photospheric abundances of stars with different activity levels

DOI: 10.1051/0004-6361:20034466 Bibcode: 2004A&A...416..281S

Sanz-Forcada, J.; Micela, G.; Favata, F.

We report a detailed analysis of the coronal abundance of 4 stars with varying levels of activity and with accurately known photospheric abundances. The coronal abundance is determined here using a line flux analysis and a full determination of the differential emission measure. Photospheric abundance values are taken from the literature. Previous…

2004 • Astronomy and Astrophysics

XMM-Newton 55

C II Radiative Cooling of the Diffuse Gas in the Milky Way

DOI: 10.1086/424730 Bibcode: 2004ApJ...615..767L

Savage, B. D.; Wakker, B. P.; Lehner, N.

The heating and cooling of the interstellar medium (ISM) allow the gas in the ISM to coexist at very different temperatures in thermal pressure equilibrium. The rate at which the gas cools or heats is therefore a fundamental ingredient for any theory of the ISM. The heating cannot be directly determined, but the cooling can be inferred from observ…

2004 • The Astrophysical Journal

eHST 55