The broad-lined Type Ic supernova 2003jd Valenti, S.; Benetti, S.; Cappellaro, E. ...
Monthly notices of the Royal Astronomical Society,
02/2008, Letnik:
383, Številka:
4
Journal Article
Results of the 1999 H8 beam tests of ATLAS-SCT prototypes Bernabeu, J.; Challis, R.; Costa, M.J. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
07/2001, Letnik:
466, Številka:
2
Journal Article
Recenzirano
During the August–September 1999 test beam in H8 at CERN three half-modules, equipped with different types of fast binary Front End electronics, have been tested. The results indicate that all three ...SCT electronics candidates satisfy ATLAS efficiency and noise occupancy requirements. In addition, a study on the effect of detector bias voltage on efficiency (ballistic deficit) is reported.
We report the successful identification of the type of the supernova responsible for the supernova remnant SNR 0509-675 in the Large Magellanic Cloud (LMC) using Gemini spectra of surrounding light ...echoes. The ability to classify outbursts associated with centuries-old remnants provides a new window into several aspects of supernova research and is likely to be successful in providing new constraints on additional LMC supernovae as well as their historical counterparts in the Milky Way Galaxy (MWG). The combined spectrum of echo light from SNR 0509-675 shows broad emission and absorption lines consistent with a supernova (SN) spectrum. We create a spectral library consisting of 26 SNe Ia and 6 SN Ib/c that are time-integrated, dust-scattered by LMC dust, and reddened by the LMC and MWG. We fit these SN templates to the observed light echo spectrum using {chi}{sup 2} minimization as well as correlation techniques, and we find that overluminous 91T-like SNe Ia with {Delta}m{sub 15} < 0.9 match the observed spectrum best.
We present multicolorHubble Space Telescope(HST) WFPC2 broadband observations of the Type Ic SN 1994I obtained∼280 d
∼
280
d
after maximum light. We measure the brightness of the SN and, relying ...on the detailed spectroscopic database of SN 1994I, we transform the ground-based photometry obtained at early times to theHSTphotometric system, deriving light curves for the WFPC2 F439W, F555W, F675W, and F814W passbands that extend from 7 days before to 280 days after maximum. We use the multicolor photometry to build a quasi-bolometric light curve of SN 1994I, and compare it with similarly constructed light curves of other supernovae. In doing so, we propose and test a scaling in energy and time that allows for a more meaningful comparison of the exponential tails of different events. Through comparison with models, we find that the late-time light curve of SN 1994I is consistent with that of spherically symmetric ejecta in homologous expansion, for which the ability to trap theγ
γ
-rays produced by the radioactive decay of
56Co
Co
56
diminishes roughly as the inverse of time squared. We also find that by the time of theHSTphotometry, the light curve was significantly energized by the annihilation of positrons.
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