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Deep ISOCAM view of the core of the lensing cluster A2390
Elbaz, D.; Pierre, M.; Vigroux, L. +4 more
We have imaged the inner square arcminute of the well known lensing and cooling flow cluster A2390 (z = 0.23) down to a sensitivity of 65 and 130 mu Jy at 6.75 and 15 mu m, respectively. We report the first evidence of an active star-forming region in a cooling flow (at those wavelengths) and strong emission in the mid-IR from lensed galaxies loca…
Integrated Ultraviolet Spectra and Line Indices of M31 Globular Clusters and the Cores of Elliptical Galaxies
Rieke, Marcia J.; Frogel, Jay A.; O'Connell, Robert W. +6 more
We present observations of the integrated light of four M31 globular clusters (MIV, MII, K280, and K58) and of the cores of six elliptical galaxies (NGC 3605, 3608, 5018, 5831, 6127, and 7619) made with the Faint Object Spectrograph on the Hubble Space Telescope. The spectra cover the range 2200-4800 Å at a resolution of 8 Å with signal-to-noise r…
Characterization and Subtraction of Well-Exposed HST/NICMOS Camera 2 Point-Spread Functions for a Survey of Very Low Mass Companions to Nearby Stars
Krist, John E.; Golimowski, David A.; Schroeder, Daniel J. +1 more
We are conducting a search for very low mass (M<0.2 M_solar) companions of stars within 10 pc of the Sun using the NICMOS infrared camera on the Hubble Space Telescope. The highly exposed images of each target star are subtracted from the NICMOS Camera 2 (NIC2) field using previously observed stars so that faint companions may be detected. We h…
Infrared Emission-Line Galaxies Associated with Dampened Ly alpha and Strong Metal Absorber Redshifts
Thompson, D.; Mannucci, F.; Williger, G. M. +1 more
Eighteen candidates for emission-line galaxies were discovered in a narrowband infrared survey that targeted the redshifts of damped Lyα or metal lines in the spectra of quasars. The presence of emission lines is inferred from the photometric magnitudes in narrowband and broadband interference filters, corresponding to Hα at redshifts of 0.89 (six…
Constraints on the Hubble constant from observations of the brightest red-giant stars in a Virgo-cluster galaxy
Harris, William E.; Durrell, Patrick R.; Pierce, Michael J. +1 more
The nearest large groups of elliptical galaxies, in the Virgo and Fornax clusters, play a central role in determinations of the Hubble constant, H0, and hence the cosmological rate of expansion. Because the relative distances between these two clusters and more remote clusters are well known, absolute distance determinations to Virgo an…
Discovery of Associated Absorption LInes in an X-Ray Warm Absorber: Hubble Space Telescope Observations of PG 1114+445
Elvis, Martin; Wilkes, Belinda; Mathur, Smitha
The unified picture of X-ray/UV absorbers offers a unique opportunity to probe the nuclear environment of active galactic nuclei. To test the unified absorber scenario and to understand the physical properties of the absorber, we obtained the first UV spectrum of PG 1114+445 using the Hubble Space Telescope (HST) Faint Object Spectrograph. PG 1114…
HST WFPC2/Hα Imagery of the Nebula M1-67: A Clumpy LBV Wind Imprinting Itself on the Nebular Structure?
Moffat, Anthony F. J.; Joncas, Gilles; Grosdidier, Yves +1 more
With the Hubble Space Telescope's Wide Field Planetary Camera 2 we have obtained a deep, Hα image of the relatively young ejection-type nebula M1-67 around the runaway Population I Wolf-Rayet star WR 124 (WN 8). This image shows a wealth of complex detail, some of which have never been seen before in such a nebula. In particular, large arcs of neb…
The Coma Berenices star cluster and its moving group
Soubiran, C.; Odenkirchen, M.; Colin, J.
We report on the analysis of astrometric and photometric data from Hipparcos, Tycho and the ACT catalogue in a 1200 sq. degree field around the nearby open star cluster in Coma Berenices and infer the characteristic features of this cluster. From a sample of 51 kinematic members we derive the cluster's distance, size and spatial structure as well …
High Minor Ion Outflow Speeds in the Inner Corona and Observed Ion Charge States in Interplanetary Space
Esser, Ruth; Brickhouse, Nancy S.; Edgar, Richard J.
Flow speeds recently derived from chromospheric/transition region and coronal observations indicate that the solar wind acceleration process takes place at heights in the solar atmosphere much lower than previously imagined. Doppler-dimming observations of the O VI λ1032 and λ1037 spectral lines show that this is not only true for the background e…
HIPPARCOS photometry of 24 variable massive stars (alpha Cygni variables)
van Leeuwen, F.; van Genderen, A. M.; Zegelaar, I.
The photometric variability of 24 alpha Cyg variables, i.e. variable super-and hypergiants, observed by the Hipparcos satellite is described. Three of the selected stars are situated in the SMC, 12 in the LMC and the remaining 9 in the Galactic plane. Four of them are hot S Dor-type variables, or LBVs (luminous blue variables) and two are possible…