7,853 research outputs found
Time Evolution and the Nature of the Near-Infrared Jets in GRS1915+105
We observed the galactic microquasar GRS1915+105 in the K (m) band
on October 16 and 17, 1995 UTC using the COB infrared (IR) imager on the Kitt
Peak National Observatory 2.1-m telescope with a 0.2-arcsec/pixel plate scale
and under good (-arcsec) seeing conditions. Using a neighboring star
in the image frames to determine the point spread function (PSF), we
PSF-subtract the images of GRS1915+105. We find no evidence of extended
emission such as the apparent near-IR jets seen by Sams et al. (1996) in July,
1995. Simple modelling of the star + jet structure allows us to place an upper
limit on any similar emission at that position of at the 95%
confidence level, as compared to as seen by Sams et al. (1996). This
lack of extended IR flux during continued hard X-ray flaring activity confirms
the hypothesis that the extended IR emission arises from the superluminal
radio-emitting jets rather than reprocessing of the X-ray emission on other
structures around the compact central object. Given the large apparent velocity
of the radio-emitting jets, by the time of our observations the Sams et al.
feature would have moved arcsec from GRS1915+105, and we can place a limit
of (95% confidence level) on any infrared emission in this region. We
can thus place an upper limit on the radiative timescale of the feature of
days, which is consistent with synchrotron jet emission.Comment: 10 pages, 3 figures; submitted to ApJ Letter
Recalibrating valence weighting biases to promote changes in rejection sensitivity and risk-taking
Past research has found that modifying individuals' valence weighting tendencies by recalibrating them to weight positive and negative valence in a more balanced manner influenced a variety of judgments. The current research examines the utility of the recalibration procedure as a targeted intervention. In Experiment 1, we recruited participants high in rejection sensitivity (who are known to exhibit a negative weighting bias) and in Experiment 2, we recruited participants with high risk tendencies (who are known to exhibit a positive weighting bias). In both experiments, participants first played BeanFest, in which they were presented with beans varying in shape and speckles and learned which increased or decreased points. They later classified the game beans, as well as novel ones varying in their resemblance to the known positives or known negatives, as good or bad. In the recalibration condition, participants were told if they classified each bean correctly, thus receiving feedback regarding the appropriate weighting of resemblance to a known positive versus a negative. The controls, who received no feedback, were less accurate at classifying the novel the beans than the recalibration participants. Furthermore, in Experiment 1, the recalibration condition subsequently exhibited lower sensitivity to rejection than the control condition, with this reduction being stronger for individuals initially higher in rejection sensitivity. This effect was still present a week later. In Experiment 2, the recalibration condition reported diminished risk-tendencies, again with this effect being stronger for individuals with initially higher riskiness, and persisting for a week. Even more importantly, recalibration participants also engaged in less risky behavior on a laboratory task
Puzzles in charm spectroscopy
We briefly analyze aspects of open and hidden charm resonances, discussing in
particular the mesons and X(3872).Comment: 8 pages, 4 figures. Invited talk given at the YKIS Seminar on New
Frontiers in QCD: Exotic Hadrons and Hadronic Matter, Kyoto, Japan, 20 Nov. -
8 Dec. 200
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