Search Publications
CaII K Emission-Line Asymmetry among Red Giants Detected by the ROSAT Satellite
Smith, Graeme H.; Shetrone, Matthew D.
Spectra of the Ca II H and K lines are reported for a number of field giants from which soft X-ray emission was detected by the ROSAT satellite. Several of these stars are RS CVn systems and exhibit very strong Ca II emission. The majority of the noninteracting giants in the sample have MV>-2.0, as determined from Hipparcos parallaxe…
Kinematics and morphology of the narrow-line region in the Seyfert galaxy NGC 1386
Dietrich, M.; Wagner, S. J.; Rossa, J.
We present a high spatial and spectral resolution 2-D echelle spectrogram of the Narrow-Line Region in the Seyfert 2 galaxy
A Photometric and Kinematic Study of the Stars and Interstellar Medium in the Central 2 Kiloparsecs of NGC 3379
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…
Wavelengths of Forbidden Transitions Arising from Levels Within the Fe+19 2S22P3 Ground Configuration
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…
Interstellar CO towards X Persei (HD 24534) - II. Two-component model
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…
Morphological number counts and redshift distributions to I=25 from the Hubble Deep Fields: constraints on cosmological models from early-type galaxies
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…
Fluctuations of the heliospheric magnetic field and the anisotropy of pickup ions
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 …
Discovery of a comet by its Lyman-α emission
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…
Markarian 421'S Unusual Satellite Galaxy
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…
Hubble Space Telescope Observations of the Associated Absorption-Line Systems in Q0122+0338
Papovich, Casey; Koekemoer, Anton M.; Bowen, David V. +4 more
We have studied a spectrum of Q0122+0338 (ze~1.202) obtained by the Faint Object Spectrograph (FOS) on board the Hubble Space Telescope (HST). We present the analysis of three associated (za~ze) absorption systems at z=1.207, 1.199, and 1.166. The most complex of these, at za~1.207, shows strong absorpti…