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Stellar populations and Lyα emission in two lensed z>~ 6 galaxies
Schaerer, Daniel; Pelló, Roser
We present an analysis of two strongly lensed galaxies at z= 6.56 and z~ 7 for which multi-band photometric and spectroscopic observations are available. For one source, the data include recent Hubble Space Telescope (HST) and Spitzer observations. Using a spectral energy distribution (SED) fitting technique considering a number of parameters (var…
Spectra of High-Redshift Type Ia Supernovae and a Comparison with Their Low-Redshift Counterparts
Wang, L.; Lidman, C.; Nugent, P. E. +33 more
We present spectra for 14 high-redshift (0.17<z<0.83) supernovae, which were discovered by the Supernova Cosmology Project as part of a campaign to measure cosmological parameters. The spectra are used to determine the redshift and classify the supernova type, essential information if the supernovae are to be used for cosmological studies. R…
Molecular Hydrogen
Maiolino, Roberto; Habart, Emilie; Walmsley, Malcolm +5 more
Observations of H2 line emission in galactic and extragalactic environments obtained with the Infrared Space Observatory (ISO) are reviewed. The diagnostic capability of H2 observations is illustrated. We discuss what one has learned about such diverse astrophysical sources as photon-dominated regions, shocks, young stellar o…
Discovery of Extremely Embedded X-Ray Sources in the R Coronae Australis Star-forming Core
Hamaguchi, Kenji; Corcoran, Michael F.; Petre, Rob +5 more
With the XMM-Newton and Chandra observatories, we detected two extremely embedded X-ray sources in the R Corona Australis (R CrA) star-forming core, near IRS 7. These sources, designated as XE and XW, have X-ray absorption columns of ~3×1023 cm-2 equivalent to AV~180 mag. They are associated w…
Chandra X-Ray Imaging of the Interacting Starburst Galaxy System NGC 7714/7715: Tidal Ultraluminous X-Ray Sources, Emergent Wind, and Resolved H II Regions
Struck, Curtis; Smith, Beverly J.; Nowak, Michael A.
We present high spatial resolution X-ray imaging data for the interacting galaxy pair NGC 7714/7715 (Arp 284) from the Chandra X-ray telescope. In addition to the unresolved starburst nucleus, a variable point source with LX~1040 ergs s-1 was detected 1.5" (270 pc) to the northwest of the nucleus, coincident with a…
Distribution of the Magnetic Flux in Elements of the Magnetic Field in Active Regions
Abramenko, V. I.; Longcope, D. W.
The unsigned magnetic flux content in the flux concentrations of two active regions is calculated by using a set of 248 high-resolution Solar and Heliospheric Observatory Michelson Doppler Imager magnetograms for each active region. Data for flaring active region NOAA 9077 (2000 July 14) and nonflaring active region NOAA 0061 (2002 August 9) were …
Diamagnetic and Expansion Effects on the Observable Properties of the Slow Solar Wind in a Coronal Streamer
Velli, M.; Dahlburg, R. B.; Einaudi, G. +1 more
The plasma density enhancements recently observed by the Large-Angle Spectrometric Coronagraph (LASCO) instrument on board the Solar and Heliospheric Observatory (SOHO) spacecraft have sparked considerable interest. In our previous theoretical study of the formation and initial motion of these density enhancements it is found that beyond the helme…
Dust in spiral galaxies: global properties
Stevens, J. A.; Gear, W. K.; Amure, M.
We present and analyse high-quality Submillimetre Common-User Bolometer Array (SCUBA) 850- and 450-µm images of 14 local spiral galaxies, including the detection of dust well out into the extended disc in many cases. We use these data in conjunction with published far-infrared flux densities from IRAS and ISO, and millimetre-wave measurement…
A spectroscopic search for the non-nuclear Wolf-Rayet population of the metal-rich spiral galaxy M 83
Schmutz, W.; Crowther, P. A.; Schild, H. +1 more
We present a catalogue of non-nuclear regions containing Wolf-Rayet stars in the metal-rich spiral galaxy M 83 (NGC 5236). From a total of 283 candidate regions identified using He ii λ4686 imaging with VLT-FORS2, Multi Object Spectroscopy of 198 regions was carried out, confirming 132 WR sources. From this sub-sample, an exceptional content of ~1…
A far UV study of interstellar gas towards HD 34078: High excitation H2 and small scale structure
Le Petit, F.; Roueff, E.; Andersson, B. -G. +5 more
To investigate the presence of small scale structure in the spatial distribution of H2 molecules we have undertaken repeated FUSE UV observations of the runaway O9.5V star, HD 34078. In this paper we present five spectra obtained between January 2000 and October 2002. These observations reveal an unexpectedly large amount of highly exci…