56 research outputs found
Editorial. Zum aktuellen Stand der Diskussion um die "personalisierte" Psychiatrie und Psychotherapie
Zusammenfassung. Im Zentrum der Debatte steht der Begriff «personalisierte» Psychiatrie und Psychotherapie und dessen unscharfe und heterogene Verwendung. Der dem Konzept inhärente Anspruch, die diagnostischen, therapeutischen und prognostischen Parameter zu verfeinern, stellt eine wesentliche Herausforderung einer zukünftigen «personzentrierten» Psychiatrie dar. </jats:p
Multi-band study of NGC 7424 and its two newly-discovered ULXs
We have studied the face-on, barred spiral NGC 7424 (site of the rare Type
IIb SN 2001ig) with Chandra, Gemini and the Australia Telescope Compact Array.
After giving revised X-ray colours and luminosity of the supernova, here we
focus on some other interesting sources in the galaxy: in particular, our
serendipitous discovery of two ultraluminous X-ray sources (ULXs). The brighter
one (~ 10^{40} erg/s) has a power-law-like spectrum with photon index Gamma ~
1.8. The other ULX shows a spectral state transition or outburst between the
two Chandra observations, 20 days apart. Optical data show that this ULX is
located in a young (age ~ 7-10 Myr), bright complex rich with OB stars and
clusters. An exceptionally bright, unresolved radio source (0.14 mJy at 4.79
GHz, implying a radio luminosity twice as high as Cas A) is found slightly
offset from the ULX (~ 80 pc). Its radio spectral index alpha ~ -0.7 suggests
optically-thin synchrotron emission, either from a young supernova remnant or
from a radio lobe powered by a ULX jet. An even brighter, unresolved radio
source (0.22 mJy at 4.79 GHz) is found in another young, massive stellar
complex, not associated with any X-ray sources: based on its flatter radio
spectral index (alpha ~ -0.3), we suggest that it is a young pulsar wind
nebula, a factor of 10 more radio luminous than the Crab.Comment: 12 pages, 11 figures. Accepted by MNRAS. High-resolution colour
images of NGC 7424 from the Gemini observations are available at
http://www.gemini.edu/2001igp
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