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Plasma Waves Near Reconnection Sites
André, M.; Vaivads, A.; Treumann, R. A. +1 more
High-Ionization Forbidden Lines in the UV Spectrum of AG Draconis
Young, P. R.; Dupree, A. K.; Espey, B. R. +1 more
High-ionization forbidden lines from Ca VII, Fe VII, Mg V, Mg VI, Mg VII, and Si VII are found in recent Hubble Space Telescope STIS ultraviolet spectra of the symbiotic star AG Draconis. These species have ionization potentials between 99 and 205 eV, which are unexpected due to the high density (~1010 cm-3) of the AG Dra neb…
Large Silicon Abundance in Photodissociation Regions
Nakagawa, Takao; Onaka, Takashi; Tomono, Daigo +3 more
We have made one-dimensional raster scan observations of the ρ Oph and σ Sco star-forming regions with two spectrometers (SWS and LWS) on board the ISO. In the ρ Oph region, [Si II] 35 µm, [O I] 63 µm, 146 µm, [C II] 158 µm, and the H2 pure rotational transition lines S(0) to S(3) are detected, and the photodisso…
Radio and X-ray observations of an exceptional radio flare in the extreme z = 4.72 blazar GBB1428+4217
Fabian, A. C.; Worsley, M. A.; Pooley, G. G. +1 more
We report on the extreme behaviour of the high-redshift blazar GBB1428+4217 at z = 4.72. A continued programme of radio measurements has revealed an exceptional flare in the light curve, with the 15.2-GHz flux density rising by a factor of ~3 from ~140 to ~430 mJy in a rest-frame time-scale of only ~4 months - much larger than any previous flares …
Astrochemistry: Complex organic matter in Titan's aerosols?
Biemann, K.
Spectral shape of the UV ionizing background and O VI absorbers at z ∼ 1.5 towards HS 0747+4259
Reimers, D.; Hagen, H. -J.; Lopez, S. +5 more
Aims.We report on high resolution spectra of the bright QSO
The Recent Star Formation in NGC 6822 from Hubble Space Telescope Imaging
Bianchi, Luciana; Efremova, Boryana V.
We present Hubble Space Telescope WFPC2 and STIS imaging of the low-metallicity galaxy NGC 6822, performed as part of a study of the young stellar populations in the galaxies of the Local Group. Eleven WFPC2 pointings, with some overlap, cover two regions extending over 19 and 13 arcmin2, respectively, off the galaxy center. The filters…
Non-self-similar scaling of plasma sheet and solar wind probability distribution functions of magnetic field fluctuations
Balogh, A.; Khurana, K. K.; Kistler, L. M. +5 more
Solar wind magnetometer and plasma data and magnetometer data acquired by Cluster in the magnetospheric plasma sheet are employed to construct probability distribution functions (PDFs) of magnetic field fluctuations over various temporal and spatial scales. This technique, often used in analysis of laboratory plasmas, is used to look for intermitt…
Adaptive-Optics-Assisted Near-Infrared Spectroscopy of SVS 13 and Its Jet
Smith, M. D.; Ray, T. P.; Nisini, B. +5 more
We present long-slit H- and K-band spectroscopy of the low-mass outflow source SVS 13, obtained with the adaptive-optics-assisted imager-spectrometer NACO on the VLT. With a spatial resolution of <0.25" and a pixel scale of 0.027", we precisely establish the relative offsets of H2, [Fe II], CO, H I, and Na I components from the sourc…
The Brave New World of Binary Star Studies
Guinan, Edward F.; Engle, Scott G.
In this paper we discuss some of the new and exciting developments in the study of binary stars. Recent technological advances (such as CCDs) now make it possible (even easy) to study faint, astrophysically important binaries that in the past could only be done with large 4 + meter class telescopes. Also, the panoramic nature of CCDs (and the use …