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Slow wind and magnetic topology in the solar minimum corona in 1996-1997
Abbo, L.; Antonucci, E.; Dodero, M. A.
This study examines the physical conditions of the outer solar corona in order to identify the regions where the slow solar wind is accelerated and to investigate the latitudinal transition from slow to fast wind during the minimum of the solar cycle. The analysis is based on observations of six streamers obtained during the years of solar minimum…
Infall, the Butcher-Oemler Effect, and the Descendants of Blue Cluster Galaxies at z~0.6
Franx, Marijn; Illingworth, Garth D.; Tran, Kim-Vy H. +3 more
Using wide-field Hubble Space Telescope WFPC2 imaging and extensive Keck LRIS spectroscopy, we present a detailed study of the galaxy populations in MS 2053-04, a massive, X-ray-luminous cluster at z=0.5866+/-0.0011. Analysis of 149 confirmed cluster members shows that MS 2053 is composed of two structures that are gravitationally bound to each ot…
High-Resolution, Long-Slit Spectroscopy of VY Canis Majoris: The Evidence for Localized High Mass Loss Events
Humphreys, Roberta M.; Davidson, Kris; Wallerstein, George +1 more
High spatial and spectral resolution spectroscopy of the OH/IR supergiant VY CMa and its circumstellar ejecta reveals evidence for high mass loss events from localized regions on the star occurring over the past 1000 yr. The reflected absorption lines and the extremely strong K I emission lines show a complex pattern of velocities in the ejecta. W…
The mass loss of C-rich giants
Bergeat, J.; Chevallier, L.
The mass loss rates, expansion velocities and dust-to-gas density ratios from millimetric observations of 119 carbon-rich giants are compared, as functions of stellar parameters, to the predictions of recent hydrodynamical models. Distances and luminosities previously estimated from HIPPARCOS data, masses from pulsations and C/O abundance ratios f…
XMM-Newton EPIC Background Modeling for Extended Sources
Markevitch, M.; Lumb, D.; Nevalainen, J.
We use XMM-Newton blank-sky and closed-cover background data to explore background subtraction methods for large extended sources filling the EPIC field of view, such as nearby galaxy clusters, for which local background estimation is difficult. In particular, we investigate the uncertainties of the background modeling in the 0.8-7.0 keV band that…
Warm gas in the cold diffuse interstellar medium: Spectral signatures in the H2 pure rotational lines
Falgarone, E.; Hily-Blant, P.; Pineau Des Forêts, G. +1 more
We present ISO-SWS observations of five pure rotational lines of H2 along a line of sight through the Galaxy which avoids regions of massive star formation. It samples 30 mag of gas, half of it (i.e. 15 mag) being diffuse gas running from the solar neighbourhood to the molecular ring, up to the far side of the Galaxy. The intensities of…
The radio-ultraviolet spectral energy distribution of the jet in 3C 273
Meisenheimer, K.; Jester, S.; Röser, H. -J. +1 more
We present deep VLA and HST observations of the large-scale jet in 3C 273 matched to 0.3 arcsec resolution. The observed spectra show a significant flattening in the infrared-ultraviolet wavelength range. The jet's emission cannot therefore be assumed to arise from a single electron population and requires the presence of an additional emission co…
Stars in the Hubble Ultra Deep Field
Panagia, N.; Walsh, J. R.; Koekemoer, A. M. +11 more
We identified 46 unresolved source candidates in the Hubble Ultra Deep Field (HUDF) down to i775=29.5. Unresolved objects were identified using a parameter S, which measures the deviation from the curve of growth of a point source. Extensive testing of this parameter was carried out, including the effects of decreasing signal-to-noise r…
VLT narrow-band photometry in the Lyman continuum of two galaxies at z ∼3. Limits to the escape of ionizing flux
Buat, V.; Burgarella, D.; Inoue, A. K. +2 more
We have performed narrow-band imaging observations with the Very Large Telescope, aimed at detecting the Lyman continuum (LC) flux escaping from galaxies at z∼3. We do not find any significant LC flux from our sample of two galaxies in the Hubble Deep Field South, at z=3.170 and 3.275. The corresponding lower limits on the F1400/F9…
Resolving the Inner Cavity of the HD 100546 Disk: A Candidate Young Planetary System?
Heap, S. R.; Grady, C. A.; Woodgate, B. +4 more
The inner 100 AU of HD 100546 is studied via far-ultraviolet long-slit spectroscopy with the Hubble Space Telescope Space Telescope Imaging Spectrograph (STIS). The star is surrounded by reflection nebulosity, which can be traced 100 AU in the continuum, and by emission from H I Lyα, N I, Si II, and fluorescent H2 transitions. The Lyα e…