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Dust Temperatures in the Infrared Space Observatory Atlas of Bright Spiral Galaxies
Bendo, George J.; Leech, Kieron; Metcalfe, Leo +11 more
We examine far-infrared and submillimeter spectral energy distributions for galaxies in the Infrared Space Observatory Atlas of Bright Spiral Galaxies. For the 71 galaxies where we had complete 60-180 µm data, we fitted blackbodies with λ-1 emissivities and average temperatures of 31 K or λ-2 emissivities and average te…
An IUE Atlas of Pre-Main-Sequence Stars. III. Co-added Final Archive Spectra from the Long-Wavelength Cameras
Valenti, Jeff A.; Johns-Krull, Christopher M.; Fallon, Adam A.
We identified 137 T Tauri stars (TTS) and 97 Herbig Ae/Be (HAEBE) stars observed by IUE in the wavelength interval 1900-3200 Å. Each low-resolution (R~6 Å) spectrum was visually inspected for source contamination and data quality, and then all usable spectra were combined to form a single time averaged spectrum for each star. For sources with mult…
A statistical study of CMEs associated with metric type II bursts
Gopalswamy, N.; Yashiro, S.; Lara, A. +2 more
We present a statistical study of the characteristics of CMEs which show temporal association with type II bursts in the metric domain but not in the decameter/hectometric (DH) domain. This study is based on a set of 80 metric (m) type II bursts associated with surface events in the solar western hemisphere. It was found that in general, the distr…
Hubble Space Telescope WFPC2 Morphologies of K-selected Extremely Red Galaxies
Yan, Lin; Thompson, David
We selected 115 extremely red objects (EROs) from deep Hubble Space Telescope (HST) WFPC2 archive data combined with ground-based K-band images, with (F814W-Ks) >= 4, K-band signal-to-noise ratio >=5, and a median limiting Ks magnitude of ~18.7, over a corresponding area of 228 arcmin2, for a morphological st…
A wavelet packets equalization technique to reveal the multiple spatial-scale nature of coronal structures
Stenborg, G.; Cobelli, P. J.
Precise determination of onset times of dynamical events as observed by coronagraphs requires a high-degree-of-accuracy tracking of the structures involved. In particular, early steps in the evolution turn to be of utmost importance. However, corresponding features often lack the sharpness needed to obtain unambiguous results. To overcome this con…
A radio continuum and infrared study of Galactic H II regions
Tielens, A. G. G. M.; van der Hulst, J. M.; Martín-Hernández, N. L.
We present observations of the 4.8 and 8.6 GHz continuum emission towards 11 southern H Ii regions made with the Australian Telescope Compact Array. The observed objects were selected from the Infrared Space Observatory (ISO) spectral catalogue of compact H Ii regions \citep{peeters:catalogue}. The morphologies observed for practically all the sou…
Chemical Abundances in Broad Emission Line Regions: The ``Nitrogen-loud'' Quasi-Stellar Object Q0353-383
Dietrich, M.; Korista, K. T.; Ferland, G. J. +3 more
The intensity of the strong N V λ1240 line relative to C IV λ1549 or to He II λ1640 has been proposed as an indicator of the metallicity of quasi-stellar object (QSO) broad emission line regions, allowing abundance measurements in a large number of QSOs out to the highest redshifts. Previously, it had been shown that the (normally) much weaker lin…
Physical Parameters of the 2000 February 11 Coronal Mass Ejection: Ultraviolet Spectra versus White-Light Images
Raymond, J. C.; Chen, J.; Ciaravella, A. +5 more
We present spectra of a three-part coronal mass ejection (CME) observed by the Ultraviolet Coronagraph Spectrometer aboard SOHO on 2000 February 11. Images of the CME in different spectral lines show how the morphology depends on the temperature, density, and outflow speed of the ejected plasma. The H I Lyα is the line that best resembles the whit…
Advanced Camera for Surveys Observations of Young Star Clusters in the Interacting Galaxy UGC 10214
Ford, H. C.; Infante, L.; Feldman, P. D. +31 more
We present the first Advanced Camera for Surveys (ACS) observations of young star clusters in the colliding/merging galaxy UGC 10214. The observations were made as part of the Early Release Observation (ERO) program for the newly installed ACS during service mission SM3B for the Hubble Space Telescope (HST). Many young star clusters can be identif…
Highly Ionized Gas in the Galactic Halo: A FUSE Survey of O VI Absorption toward 22 Halo Stars
Savage, B. D.; Sembach, K. R.; Howk, J. C. +1 more
Far Ultraviolet Spectroscopic Explorer (FUSE) spectra of 22 Galactic halo stars are studied to determine the amount of O VI in the Galactic halo between ~0.3 and ~10 kpc from the Galactic midplane. Strong O VI λ1031.93 absorption was detected toward 21 stars, and a reliable 3 σ upper limit was obtained toward HD 97991. The weaker member of the O V…