Science Archives Publication System

Dynamic Modelling of the Hipparcos Attitude

DOI: 10.1023/A:1026228018073 Bibcode: 2003SSRv..108..537V

van Leeuwen, Floor; Fantino, Elena

We present a new method for a high-accuracy reconstruction of the attitude for a slowly spinning satellite. This method, referred to as the fully-dynamic approach, explores the possibility to describe the satellite's attitude as that of a rigid body subject to continuous external torques. The method is tried out on the Hipparcos data and is shown …

2003 • Space Science Reviews

Hipparcos 12

H ₂O- and OH-bearing minerals in the martian regolith: . analysis of 1997 observations from HST/NICMOS

DOI: 10.1016/S0019-1035(03)00208-2 Bibcode: 2003Icar..166....1N

Gordon, K. D.; Wolff, M. J.; Noe Dobrea, E. Z. +1 more

We have analyzed observations of the Acidalia hemisphere of Mars taken by the Hubble Space Telescope's Near-Infrared Camera Multi-Object Spectrograph (HST/NICMOS) during July of 1997 ( L_s=152°, northern martian summer). The data consist of images at ∼60 km/pixel resolution, using both narrow- and medium-band filters specifically selecte…

2003 • Icarus

eHST 12

Deconstructing HD 28867

DOI: 10.1086/368245 Bibcode: 2003AJ....125.2123W

Walter, Frederick M.; Wolk, Scott J.; Morse, Jon A. +1 more

The 3" pair of B9 stars HD 28867 is one of the brightest X-ray sources in the Taurus-Auriga star-forming region. In this multiwavelength study, we attempt to deduce the source of the X-ray emission. We show that the east component is the X-ray source. The east component has a near-IR excess and displays narrow absorption lines in the optical, both…

2003 • The Astronomical Journal

IUE 12

Modeling far-infrared line emission from the HII region S125

DOI: 10.1051/0004-6361:20030727 Bibcode: 2003A&A...406..155A

Emery, R. J.; Aannestad, P. A.

We present ISO-LWS spectral line observations of the [OI] 63 and 146 mu m lines, the [CII] 158 mu m line, and the [NII] 122 mu m line at 17 positions in the HII region S125. We model this emission by a two-dimensional geometrical blister model, utilizing the parameters derived from our previous modeling of the HII, HI and FIR dust emission in this…

2003 • Astronomy and Astrophysics

ISO 12

Measurement of the Sunyaev-Zel'dovich increment in massive galaxy clusters

DOI: 10.1111/j.1365-2966.2003.07163.x Bibcode: 2003MNRAS.346.1179Z

Halpern, Mark; Pierpaoli, Elena; Chapman, Scott +4 more

We have detected the Sunyaev-Zel'dovich (SZ) increment at 850 µm in two galaxy clusters (Cl 0016+16 and MS 1054.4-0321) using the Submillimetre Common User Bolometer Array (SCUBA) on the James Clerk Maxwell Telescope. Fits to the isothermal β model yield a central Compton y parameter of (2.2 +/- 0.7) × 10^-4 and a central 850-&micr…

2003 • Monthly Notices of the Royal Astronomical Society

ISO 12

Sunspot plume observations in the EUV. The gas pressure differential between the umbra and surrounding region

DOI: 10.1051/0004-6361:20031057 Bibcode: 2003A&A...407L..29D

Doyle, J. G.; Madjarska, M. S.

The electron density over a bright sunspot plume region was evaluated using lines within the O V 760 Å multiplet. The plume showed an intensity enhancement factor of ~9 in the O V lines compared to regions outside the sunspot umbra. Internal agreement between the various ratios is excellent which would suggest that the O V lines do not suffer from…

2003 • Astronomy and Astrophysics

SOHO 12

Hot Dust in Radio-loud Active Galactic Nuclei

DOI: 10.1086/381079 Bibcode: 2003ApJ...599L..13F

Haas, Martin; Siebenmorgen, Ralf; Freudling, Wolfram

We have measured mid-infrared (MIR) fluxes of 3C sources on images taken with ISOCAM on board the Infrared Space Observatory (ISO). The photometric data were combined with existing photometry at other wavelengths to assemble the spectral energy distribution (SED) for each galaxy from infrared to radio wavelengths. In addition, we used ISOPHOT spec…

2003 • The Astrophysical Journal

ISO 11

ISO observations of the giant planets and Titan: what have we learnt?

DOI: 10.1016/S0032-0633(02)00145-9 Bibcode: 2003P&SS...51...89E

Encrenaz, Thérèse

Infrared spectroscopic observations of the giant planets and Titan with the Infrared Space Observatory (ISO) have brought a significant contribution to our knowledge of these objects. The main discoveries achieved by ISO are: (1) the first detection of an external oxygen source for all giant planets and Titan; (2) the first detection of new strato…

2003 • Planetary and Space Science

ISO 11

The quest for hot gas in the halo of NGC 1511

DOI: 10.1051/0004-6361:20030381 Bibcode: 2003A&A...403..547D

Ehle, M.; Jansen, F.; Heckman, T. M. +3 more

XMM-Newton observations of the starburst galaxy NGC 1511 reveal the presence of a previously unknown extended hot gaseous phase of its ISM, which partly extends out of the disk plane. The emission distribution is asymmetric, being brightest in the eastern half of the galaxy, where also radio continuum observations suggest the highest level of star…

2003 • Astronomy and Astrophysics

XMM-Newton 11

Photospheric and chromospheric oscillations in the base of coronal holes

DOI: 10.1023/A:1027301101788 Bibcode: 2003SoPh..217...53K

Kobanov, N. I.; Makarchik, D. V.; Sklyar, A. A.

In this paper we carry out an analysis of the spatial-temporal line-of-sight velocity variations measured in the chromospheric (Hα, Hβ) and photospheric (Fei 6569 Å, Fei 4864 Å, Nii 4857 Å) lines at the base of 17 coronal holes. Time series of a duration from 43 to 120 min were recorded with the CCD line-array and the CCD matrix. Rather frequently…

2003 • Solar Physics

SOHO 11