Science Archives Publication System

A Photometric and Kinematic Study of the Stars and Interstellar Medium in the Central 2 Kiloparsecs of NGC 3379

DOI: 10.1086/308286 Bibcode: 2000ApJ...529..866P

Winge, Cláudia; Ferrari, Fabricio; Macchetto, F. Duccio +2 more

Hubble Space Telescope images of NGC 3379 show that the V and I luminosity profiles in the inner 13" of this E1 galaxy are represented by two different components: a stellar bulge following a Sérsic law with exponent n=2.36 and a central core (r<0.7") with a characteristic ``cuspy'' profile. Subtraction of the underlying stellar component repre…

2000 • The Astrophysical Journal

eHST 10

Wavelengths of Forbidden Transitions Arising from Levels Within the Fe⁺¹⁹ 2S²2P³ Ground Configuration

DOI: 10.1086/309109 Bibcode: 2000ApJ...538..424K

Curdt, W.; Feldman, U.; Kucera, T. A. +1 more

In this paper we report the identification of all remaining unidentified forbidden lines arising from transitions within levels of the Fe⁺¹⁹ ground configuration. These lines were identified using data from the SOHO/SUMER spectrograph and Skylab. Adjusted wavelength values are also given for some previously observed lines. Forbidden lin…

2000 • The Astrophysical Journal

SOHO 10

Interstellar CO towards X Persei (HD 24534) - II. Two-component model

DOI: 10.1046/j.1365-8711.2000.03602.x Bibcode: 2000MNRAS.316..875K

Kaczmarczyk, Grzegorz

The observations made by the Goddard High Resolution Spectrograph (GHRS) aboard the Hubble Space Telescope (HST) of molecular CO in absorbing gas towards X Persei are reported. The two-component statistical equilibrium model incorporating radiative excitation of CO by line emission at the same velocity that originates in nearby molecular clouds ha…

2000 • Monthly Notices of the Royal Astronomical Society

IUE eHST 10

Morphological number counts and redshift distributions to I=25 from the Hubble Deep Fields: constraints on cosmological models from early-type galaxies

DOI: 10.1046/j.1365-8711.2000.03872.x Bibcode: 2000MNRAS.319..807P

Couch, Warrick J.; Phillipps, S.; Driver, S. P. +5 more

We combine magnitude and photometric redshift data on galaxies in the Hubble Deep Fields with morphological classifications in order to separate out the distributions for early-type galaxies. The updated morphological galaxy number counts down to I=25 and the corresponding redshift distributions are used as joint constraints on cosmological models…

2000 • Monthly Notices of the Royal Astronomical Society

eHST 10

Fluctuations of the heliospheric magnetic field and the anisotropy of pickup ions

DOI: 10.1029/2000GL000068 Bibcode: 2000GeoRL..27.2793N

Balogh, A.; Erdős, G.; Németh, Z.

Pitch angle distribution of interstellar pickup ions at high heliographic latitude is studied. Based on high time resolution magnetic field observations by Ulysses during the south polar pass in 1994, we have determined the angular distribution of particles at the moment of ionization. Due to large deviations of the field from Parker's spiral, it …

2000 • Geophysical Research Letters

Ulysses 10

Discovery of a comet by its Lyman-α emission

DOI: 10.1038/35012526 Bibcode: 2000Natur.405..321M

Bertaux, Jean-Loup; Laakso, Harri; Lallement, Rosine +6 more

Several searches for near-Earth objects have recently been initiated, as a result of increased awareness of the hazard of impacts on the Earth. These programs mainly search for asteroids, so amateur astronomers can still contribute to the discovery of comets, especially out of the orbital plane of the Solar System. An ideal way to search for comet…

2000 • Nature

SOHO 10

Markarian 421'S Unusual Satellite Galaxy

DOI: 10.1086/301289 Bibcode: 2000AJ....119.1677G

van Zee, Liese; Gorham, Peter W.; Unwin, Stephen C. +1 more

We present Hubble Space Telescope (HST) imagery and photometry of the active galaxy Markarian 421 and its companion galaxy 14" to the east-northeast. The HST images indicate that the companion is a morphological spiral rather than elliptical, as previous ground-based imaging has concluded. The companion has a bright, compact nucleus, appearing unr…

2000 • The Astronomical Journal

eHST 10

Hubble Space Telescope Observations of the Associated Absorption-Line Systems in Q0122+0338

DOI: 10.1086/308478 Bibcode: 2000ApJ...531..654P

Papovich, Casey; Koekemoer, Anton M.; Bowen, David V. +4 more

We have studied a spectrum of Q0122+0338 (z_e~1.202) obtained by the Faint Object Spectrograph (FOS) on board the Hubble Space Telescope (HST). We present the analysis of three associated (z_a~z_e) absorption systems at z=1.207, 1.199, and 1.166. The most complex of these, at z_a~1.207, shows strong absorpti…

2000 • The Astrophysical Journal

eHST 10

Fabrication, test and performance of very large X-ray CCDs designed for astrophysical applications

DOI: 10.1016/S0168-9002(99)00938-9 Bibcode: 2000NIMPA.439..547S

Haberl, F.; Trümper, J.; Kendziorra, E. +26 more

A 6×6cm² large X-ray CCD has been developed and fabricated at the Semiconductor Laboratory of the Max-Planck-Institut für Extraterrestrische Physik. The CCD has been designed for the focal plane cameras of two satellite missions. The concept is a fully depleted pn-CCD which is sensitive over the whole wafer thickness of about 300µ…

2000 • Nuclear Instruments and Methods in Physics Research A

XMM-Newton 10

Random-Lag Singular Cross-Spectrum Analysis

DOI: 10.1086/312419 Bibcode: 2000ApJ...528L..53V

Henney, C. J.; Ulrich, R. K.; Bertello, L. +1 more

In a previous paper (Varadi et al.), random-lag singular spectrum analysis was introduced for finding oscillations in very noisy and long time series. This work presents a generalization of the technique to search for common oscillations in two or more time series.

2000 • The Astrophysical Journal

SOHO 10