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Coronal Holes Versus Normal Quiet Sun Observed with SUMER
Solanki, S. K.; Wilhelm, K.; Brković, A. +5 more
We present a preliminary analysis of spectral lines obtained with the SUMER instrument (Solar Ultraviolet Measurements of Emitted Radiation) onboard the Solar and Heliospheric Observatory (SOHO), as observed during three observing campaigns. From the 70 observed spectral lines, we selected 12, representing 9 ions or atoms, in order to analyse line…
Sequences of Nearby Open Clusters with Hipparcos
Arenou, F.; Lebreton, Y.; Robichon, N.
Ultra-Luminous IR Galaxies at Low and High Redshift
Scoville, Nick
In the luminous infrared galaxies, nuclear starbursts and active nuclei are fueled by extraordinarily large masses of gas and dust concentrated at radii of a few hundred pc by galactic merging and viscous accretion. The nearby ULIRGS are probably excellent analogs of galaxies seen at high redshift during the epoch of galaxy formation and growth. W…
Hubble Space Telescope WFPC2 Color-Magnitude Diagram of NGC 6287
Stetson, P. B.; Kellar Fullton, L.; Carney, B. W.
An Estimation of the Galactic Escape Velocity From High-Velocity Metal-Poor Stars
Meillon, L.
A large number of high-velocity stars was included in the Hipparcos Input Catalogue for the purpose of determining the galactic escape velocity in the solar vicinity. However, the `fastest' stars known, listed by Carney et al. (1994, CLLA) were not included because they are too faint. In the intersection between the CLLA list and the Hipparcos Cat…
ISO Far-Infrared Deep Survey of the Lockman Hole
Kawara, K.; Taniguchi, Y.; Matsuhara, H.
Galaxies at High Redshift
Illingworth, Garth
Within just the last few years, we have advanced from knowing only a few galaxies at z>2 to having redshifts for nearly 1000 z ∼ 2–5objects. The majority of this sample has been detected through the photometric `drop-out' technique used so successfully by Steidel and his collaborators. In addition, a handful of objects have already been detecte…
The Origin of QSO Mg II λ 2796 Lines
Danks, A. C.
We have started a systematic spectroscopic survey of stars in the η Carina nebula using the echelle mode of the Space Telescope Imaging Spectrograph (STIS). The Mg II λ2796/λ2803 lines seen in our R ∼ 100000, spectra of the star CPD–59° 2603 show a remarkable similarity with the intervening Mg II system seen in QSO absorption spectra. S…
NICMOS observations of luminous & ultraluminous infrared galaxies
Evans, Aaron S.
HST NICMOS observations of a sample of 24 luminous (LIGs: LIR[8-1000 µm] = 1011.0-11.99 L⊙) and ultraluminous (ULIGs:LIR ≳ 1012.0 L⊙) infrared galaxies are presented.The observations provide, for the first time, high resolution HST imagingof the imbedded 1.1 - 2.2 µm nuc…
HST Observations of Abell 2125: Radio Emission and the Butcher-Oemler Effect
Owen, F. N.; Keel, W. C.; Ledlow, M. J. +1 more