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A study of the unification of quiet-Sun transient-event phenomena
Harrison, R. A.; Brković, A.; Harra, L. K. +1 more
A number of small-scale, globally distributed solar transient event-types have been reported in the literature. Their potential role in fundamental processes in the solar atmosphere, such as coronal heating and wind acceleration, is under active investigation. However, the event-types, such as those known as blinkers, explosive events, EUV (extrem…
The complex FeK line of the Narrow-Line Seyfert 1 galaxy IRAS 13349+2438
Nandra, K.; Cappi, M.; Dadina, M. +2 more
The observation of the Narrow-Line Seyfert 1 galaxy IRAS 13349+2438 performed by XMM-Newton European Photon Imaging Camera between 0.3-10 keV, is presented here. The broadband spectrum of the source is dominated at low energies (E <=2 keV) by a strong excess of emission and by complex emission/absorption features between ~ 5.5-8.0 keV. The soft…
The Small Magellanic Cloud in the far infrared. I. ISO's 170 mu m map and revisit of the IRAS 12-100 mu m data
Lemke, D.; Klaas, U.; Haas, M. +3 more
The ISOPHOT experiment onboard the ISO satellite generated a complete view of the Small Magellanic Cloud (SMC) at 170 mu m with 1.5 arcmin resolution. The map is analysed using an automated photometry program enabling accurate photometric characterization of the far infrared (FIR) emitting regions. An integrated FIR luminosity of 8.5x 107
XMM-Newton study of the star forming region NGC 1333
Preibisch, T.
We analyze the data of a deep XMM-Newton X-ray imaging observation of the NGC 1333 star forming region. The observation covered a period of about 14 hours and has a total MOS-equivalent exposure time of 235 ksec. In addition to 46 bright X-ray sources revealed by source detection routines, we find weak X-ray emission at the positions of 40 X-ray s…
Sensitivity kernels for time-distance inversion based on the Rytov approximation
Pijpers, F. P.; Jensen, J. M.
The study of the solar convection zone has been given a new impetus with what promises to be a very powerful new tool in time-distance helioseismology (Duvall et al. \cite{DJHP93}). Using data obtained with this technique, it has become possible to do a tomographic reconstruction of structures in the convection zone. Most of the work done on inver…
The high-velocity outflow in the proto-planetary nebula Hen 3-1475
García-Lario, P.; Riera, A.; Manchado, A. +2 more
The proto-planetary nebula Hen 3-1475 shows a remarkable highly collimated optical jet with an S-shaped string of three pairs of knots and extremely high velocities. We present here a detailed analysis of the overall morphology, kinematic structure and the excitation conditions of these knots based on deep ground-based high dispersion spectroscopy…
STIS Spectral Imagery of the OB Stars in NGC 604. II. The Most Luminous Stars
Bruhweiler, Fred C.; Miskey, Cherie L.; Smith Neubig, Margaret
We present results using two-dimensional spectral imagery and photometry obtained with the Hubble Space Telescope (HST) for the starburst H II region NGC 604, in the nearby galaxy M33. The spectral imagery was acquired with the Space Telescope Imaging Spectrograph (STIS) using the MAMA-G140L configuration, which provided wavelength coverage spanni…
Properties of the solar velocity field indicated by motions of coronal bright points
Vršnak, B.; Wöhl, H.; Clette, F. +3 more
Full-disc solar images obtained with the Extreme Ultraviolet Imaging Telescope (EIT) on board the Solar and Heliospheric Observatory (SOHO) are used to analyse properties of the solar velocity field by tracing coronal bright points from June 4, 1998 to May 22, 1999. Rotation velocity residuals, meridional motions and their relationship are investi…
The temperature and distribution of gas in CL 0016+16 measured with XMM-Newton
Birkinshaw, M.; Worrall, D. M.
We present the results of a 37-ks observation of CL 0016+16 with the XMM-Newton EPIC instrument. Within 1.5 arcmin of the cluster centre we measured a gas temperature of kT= 9.13+0.24-0.22 keV and an abundance of 0.22+0.04-0.03 times the solar value (1σ uncertainties). This significant improvement over p…
XMM-Newton study of the Serpens star-forming region
Preibisch, T.
We analyze a XMM-Newton X-ray observation of the Serpens dark cloud with a total MOS-equivalent exposure time of 57 ksec. We find 45 individual X-ray sources. None of the class 0 protostars, only one of the class I protostars, and two of the flat-spectrum objects in the region are detected in X-rays. The optically invisible flat-spectrum source EC…