5,011 research outputs found
Extended Emission from Cygnus X-3 Detected with Chandra
We have discovered extended X-ray emission from the microquasar Cyg X-3 in
archival Chandra X-ray Observatory observations. A 5" wide structure lies
approximately 16" to the NE from the core point source and may be extended in
that direction. This angular scale corresponds to a physical extent of roughly
0.8 lyr, at a distance of 2.5 lyr from Cyg X-3 (assuming a 10 kpc distance).
The flux varied by a factor of 2.5 during the four months separating two of the
observations, indicating significant substructure. The peak 2-10 keV luminosity
was about 5e34 ergs/s. There may also be weaker, extended emission of similar
scale oppositely directed from the core, suggesting a bipolar outflow. This
structure is not part of the dust scattering halo, nor is it caused by the
Chandra point spread function. In this Letter we describe the observations and
discuss possible origins of the extension.Comment: Submitted to ApJ Letters. 5 pages, 2 figures (1 color). Uses
emulateap
RXTE Observations of LMC X-1 and LMC X-3
Of all known persistent stellar-mass black hole candidates, only LMC X-1 and
LMC X-3 consistently show spectra that are dominated by a soft, thermal
component. We present results from long (170ksec) Rossi X-ray Timing Explorer
(RXTE) observations of LMC X-1 and LMC X-3 made in 1996 December. The spectra
can be described by a multicolor disk blackbody plus an additional high-energy
power-law. Even though the spectra are very soft (Gamma is about 2.5), RXTE
detected a significant signal from LMC X-3 up to energies of 50keV, the hardest
energy at which the object was ever detected.
Focusing on LMC X-3, we present results from the first year of an ongoing
monitoring campaign with RXTE which started in 1997 January. We show that the
appearance of the object changes considerably over its ~200d long cycle. This
variability can either be explained by periodic changes in the mass transfer
rate or by a precessing accretion disk analogous to Her X-1.Comment: 4 pages, 5 figures, also available at
http://aitzu3.ait.physik.uni-tuebingen.de/publications/preprints1998.html to
be published in "Highlights of X-Ray Astronomy, a symposium in honour of
Joachim Truemper" (B. Aschenbach et al., eds.), MPE Repor
Monitoring the Short-Term Variability of Cyg X-1: Spectra and Timing
We present first results from the spectral and temporal analysis of an RXTE
monitoring campaign of the black hole candidate Cygnus X-1 in 1999. The timing
properties of this hard state black hole show considerable variability, even
though the state does not change. This has previously been noted for the power
spectral density, but is probably even more pronounced for the time lags. From
an analysis of four monitoring observations of Cyg X-1, separated by 2 weeks
from each other, we find that a shortening of the time lags is associated with
a hardening of the X-ray spectrum, as well as with a longer characteristic
``shot time scale''. We briefly discuss possible physical/geometrical reasons
for this variability of the hard state properties.Comment: 5 pages, 2 figures, Proc. of the 5th Compton Symposium, AIP, in pres
"Det var jag som var den dÀr vuxna och han var ett barn" : En kvalitativ studie om hur det Àr att vara ett vuxet barn till en alkoholist
Syftet med vÄrt lÀrdomsprov Àr att undersöka hur uppvÀxten i en alkoholistfamilj har pÄverkat det vuxna barnet. Vi undersöker Àven vilka konsekvenser det vuxna barnet fÄtt av uppvÀxten, vilket förhÄllningssÀtt det vuxna barnet har till alkohol och hur relationen mellan det vuxna barnet och den missbrukande förÀldern ser ut.
I teoridelen definieras alkoholismen; vad Ă€r alkoholism, vem kan bli alkoholist och vad Ă€r skillnaden mellan en alkoholist och en storkonsument. Vidare faststĂ€lls missbrukets effekt pĂ„ familjen, samt barnens roller i en alkoholistfamilj. Ăven typiska karaktĂ€rsdrag och konsekvenser i vuxenlivet tas upp.
I undersökningen har vi anvÀnt oss av kvalitativ undersökning. Vi har intervjuat fyra personer som har en pappa som Àr alkoholist. I resultatet framkommer bÄde likheter och olikheter mellan vuxna barn till alkoholister, men den gemensamma nÀmnaren Àr konsekvenser i vuxenlivet för alla barn som levt med en alkoholiserad förÀlder.The aim of our thesis is to investigate how growing up with an alcoholic parent has affected the adult child. We also examine the impact on the adult child as a result of growing up in a family where one parent is or was an alcoholic, what kind of attitude the adult child has to alcohol and how the relationship between the adult child and the alcoholic parent has been affected.
In our theoretical part, we define alcoholism; what is alcoholism, who can become an alcoholic and what is the difference between an alcoholic and a big consumer. Further down we establish the impact on the family and the children's roles in the family. We also cover the typical characteristics and consequences in adult life.
In the survey, we used a qualitative research. We have interviewed four people who have a father who is an alcoholic. The result shows both similarities and differences between adult children of alcoholics, but the common denominator is that all children of alcoholics are affected in adulthood
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