Search Publications
The Environment of FS Tauri Observed with Hubble Space Telescope Wide Field Planetary Camera 2 in Narrowband Emission Line Filters
Eislöffel, Jochen; Mundt, Reinhard; Ray, Thomas P. +1 more
We present the results of Hubble Space Telescope Wide Field Planetary Camera (WFPC2) observations of FS Tau and its environment obtained in the narrowband emission line filters Hα and [S II] λλ6716,6731 Å. Based on these data the morphology of line emission within this region can be studied on a size scale of 0.1" for the first time. Despite the f…
Hubble Space Telescope NICMOS Images of the HH 7/11 Outflow in NGC 1333
Noriega-Crespo, A.; Young, E.; Chen, H. +1 more
We present near-infrared images in H2 at 2.12 µm of the HH 7/11 outflow and its driving source SVS 13 taken with the Hubble Space Telescope NICMOS2 camera, as well as archival Hα and [S II] optical images obtained with the Wide Field Planetary Camera 2 (WFPC2). The Near-Infrared Camera and Multi-Object Spectrometer high angular re…
A comparison of mean density and microscale density fluctuations in a CME at 10 Rsolar
Lynch, B. J.; Sheeley, N. R.; Coles, W. A.
We have observed intensity scintillation (IPS) of the radio source 0854 + 201 at 8 GHz on August 2, 2000 during the passage of a coronal mass ejection (CME) across the line of sight. The source was at a distance of 10 Rsolar over the north solar pole. Simultaneous observations with the LASCO C3 instrument allow us to model the mean dens…
Interpreting the M22 Spike Events
Gaudi, B. Scott
Recently Sahu et al., using the Hubble Space Telescope to monitor stars in the direction of the old (~12 Gyr) globular cluster M22, detected six events in which otherwise constant stars brightened by ~50% during a time of <~1 day. They tentatively interpret these unresolved events as being caused by microlensing of background bulge stars by fre…
Boron in the Small Magellanic Cloud: A Novel Test of Light-Element Production
Lambert, D. L.; Cunha, K.; Venn, K. A. +3 more
Hubble Space Telescope Space Telescope Imaging Spectrograph (STIS) observations of the B III resonance line at λ2066 have been obtained and analyzed for two Small Magellanic Cloud (SMC) B-type stars. While boron is not detected in either star, upper limits to the boron abundance are set, with 12+log(B/H)<=1.6 for both AV 304 and NGC 346-637. Th…
A Preliminary Radial-Velocity Curve for the Star θ1 Ori D
Vitrichenko, É. A.
The origin of the anomalous intensity ratio between very bright UV FeII lines and their satellites in gaseous condensations close to the star eta Carinae
Johansson, S.; Letokhov, V. S.; Klimov, V.
We present a model that explains the anomalous intensity ratios between each of two very bright UV lines of Fe II at 2507 Å and 2509 Å and its corresponding satellite line, observed in HST spectra of a compact gaseous condensation (blob B) in the vicinity of the star protect eta Car.The model is based on the assumption that the FeII transitions ha…
An unusual iron Lo-BAL quasar detected by ISOCAM
Elbaz, D.; Cesarsky, C.; Duc, P. -A. +10 more
We report the discovery of an unusual low-ionization broad absorption line quasar at z=1.776 which exhibits absorption lines from many excited states of Fe II. This member of the rare class of ``FeLoBAL'' quasars was serendipitously found in a mid-infrared (MIR) survey of distant clusters carried out with the ISOCAM camera. ISO J005645.1-273816 ha…
Is Thermal Expansion Driving the Initial Gas Ejection in NGC 6251?
Melia, Fulvio; Liu, Siming; Fatuzzo, Marco
The relativistic jets in active galactic nuclei (AGNs) are probably driven by the action of supermassive, spinning black holes. There is very little direct evidence for this, however, since the nuclei of active galaxies are difficult to study. This is now changing with new, high-resolution multiwavelength observations of nearby sources such as Sgr…
Star formation in the warped outer pseudoring of the spiral galaxy NGC 3642
Bosma, A.; Athanassoula, E.; Verdes-Montenegro, L.
NGC 3642 was classified as a spiral galaxy with three rings and no bar. We have performed an HI and optical study of this nearly face-on galaxy. We find that the nuclear ring might in fact be part of an inner one-armed spiral, that could be driving nuclear accretion and feeding the central activity in the inner kpc. The inner ring is faint, and th…