Science Archives Publication System

Gas-grain chemical models of star-forming molecular clouds as constrained by ISO and SWAS observations

DOI: 10.1051/0004-6361:20011193 Bibcode: 2001A&A...378.1024C

Ehrenfreund, P.; Charnley, S. B.; Rodgers, S. D.

We have investigated the gaseous and solid state molecular composition of dense interstellar material that periodically experiences processing in the shock waves associated with ongoing star formation. Our motivation is to confront these models with the stringent abundance constraints on CO₂, H₂O and O₂, in both ga…

2001 • Astronomy and Astrophysics

ISO 104

The New Solar Corona

DOI: 10.1146/annurev.astro.39.1.175 Bibcode: 2001ARA&A..39..175A

Aschwanden, Markus J.; Rabin, Douglas M.; Poland, Arthur I.

We focus on new observational capabilities (Yohkoh, SoHO, TRACE), observations, modeling approaches, and insights into physical processes of the solar corona. The most impressive new results and problems discussed in this article can be appreciated from the movies available on the Annual Reviews website and at http://www.lmsal.com/pub/araa/araa.ht…

2001 • Annual Review of Astronomy and Astrophysics

SOHO 104

The Proper Motion, Parallax, and Origin of the Isolated Neutron Star RX J185635-3754

DOI: 10.1086/319058 Bibcode: 2001ApJ...549..433W

Walter, Frederick M.

The isolated neutron star RX J185635-3754 is the closest known neutron star to the Sun. Based on Hubble Space Telescope Wide Field Planetary Camera 2 observations over a 3 yr baseline, I report its proper motion (332+/-1 mas yr^-1 at a position angle of 100.3d+/-0.1d) and parallax (16.5+/-2.3 mas, 61 pc). This proper motion brings the ne…

2001 • The Astrophysical Journal

eHST 103

On-the-Disk Development of the Halo Coronal Mass Ejection on 1998 May 2

DOI: 10.1086/321577 Bibcode: 2001ApJ...556..421P

Thompson, B. J.; Pick, M.; Maia, D. +7 more

A halo coronal mass ejection (CME) was observed at 15:03 UT on 1998 May 2 by the Solar and Heliospheric Observatory Large-Angle Spectrometric Coronagraph. The observation of the CME was preceded by a major soft X-ray flare in NOAA Active Region 8210, characterized by a delta spot magnetic configuration and some activity in region 8214. A large tra…

2001 • The Astrophysical Journal

SOHO 103

The NGC 4839 group falling into the Coma cluster observed by XMM-Newton

DOI: 10.1051/0004-6361:20000182 Bibcode: 2001A&A...365L..74N

Aghanim, N.; Arnaud, M.; Molendi, S. +7 more

We present here the first analysis of the XMM-Newton EPIC-MOS data of the galaxy group around NGC 4839, which lies at a projected distance to the Coma cluster center of 1.6h₅₀^-1 Mpc. In our analysis, which includes imaging, spectro-imaging and spectroscopy we find compelling evidence for …

2001 • Astronomy and Astrophysics

XMM-Newton 103

Cepheid Calibration of the Peak Brightness of Type Ia Supernovae. XI. SN 1998aq in NGC 3982

DOI: 10.1086/323529 Bibcode: 2001ApJ...562..314S

Panagia, N.; Saha, A.; Macchetto, F. D. +4 more

Repeated imaging observations have been made of NGC 3982 with the Hubble Space Telescope between 2000 March and May, over an interval of 53 days. Images were obtained on 12 epochs in the F555W band and on five epochs in the F814W band. The galaxy hosted the Type Ia supernova (SN Ia) SN 1998aq. A total of 26 Cepheid candidates were identified, with…

2001 • The Astrophysical Journal

eHST 103

The M 31 double nucleus probed with OASIS. A natural vec m = 1 mode?

DOI: 10.1051/0004-6361:20010317 Bibcode: 2001A&A...371..409B

Combes, F.; Copin, Y.; Emsellem, E. +3 more

We present observations with the adaptive optics assisted integral field spectrograph OASIS of the M 31 double nucleus in the spectral domain around the Calcium triplet at a spatial resolution better than 0farcs5 FWHM. These data are used to derive the two-dimensional stellar kinematics within the central 2 arcsec. Archival WFPC2/HST images in the…

2001 • Astronomy and Astrophysics

eHST 103

The ISO-SWS spectrum of planetary nebula NGC 7027

DOI: 10.1051/0004-6361:20000435 Bibcode: 2001A&A...367..949B

Pottasch, S. R.; Beintema, D. A.; Bernard Salas, J. +1 more

We present the infrared spectrum of the planetary nebula NGC 7027 observed with the Short Wavelength Spectrometer (SWS), on board the Infrared Space Observatory (ISO). These data allow us to derive the electron density and, together with the IUE and optical spectra, the electron temperature for several ions. The nebular composit…

2001 • Astronomy and Astrophysics

ISO IUE 103

Chandra Detection of a Hot Gaseous Corona around the Edge-on Galaxy NGC 4631

DOI: 10.1086/323179 Bibcode: 2001ApJ...555L..99W

Lauroesch, James T.; Walterbos, Rene; Wang, Q. Daniel +2 more

We present a Chandra X-ray observation that shows, unambiguously for the first time, the presence of a giant diffuse X-ray-emitting corona around the edge-on disk galaxy NGC 4631. This corona, with a characteristic thermal temperature of (2-7)×10⁶ K, extends as far as 8 kpc away from the galactic plane. The X-ray morphology resembles th…

2001 • The Astrophysical Journal

eHST 103

High-Resolution Mid-Infrared Imaging of Infrared-Luminous Starburst Galaxies

DOI: 10.1086/322119 Bibcode: 2001AJ....122.1213S

Egami, E.; Scoville, N. Z.; Matthews, K. +7 more

Observations for seven infrared-luminous starburst galaxies are reported in the mid-infrared from 8 to 18 µm using the Keck telescopes with spatial resolution approaching the diffraction limit. All of the galaxies observed show evidence of strong interactions based on optical morphologies. For these galaxies, a substantial fraction, usually …

2001 • The Astronomical Journal

eHST 102