The origin of the unification model for active galactic nuclei (AGN) was the detection of broad hydrogen recombination lines in the optical polarized spectrum of the Seyfert 2 galaxy (Sy2) NGC 1068. Since then, a search for the hidden broad-line region (HBLR) of nearby Sy2s started, but polarized broad lines have only been detected in ˜30-40 per
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Upholding the unified model for active galactic nuclei: VLT/FORS2 spectropolarimetry of Seyfert 2 galaxiesRamos Almeida, C. et al.92016
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Upper limits on gravitational wave bursts in LIGO's second science run
We perform a search for gravitational wave bursts using data from the second science run of the LIGO detectors, using a method based on a wavelet time-frequency decomposition. This search is sensitive to bursts of duration much less than a second and with frequency content in the 100-1100 Hz range. It features significant improvements in the
Abbott, B. et al.Fecha de publicación:
92005 -
Using population synthesis of massive stars to study the interstellar medium near OB associations
Aims: We study the massive stars in OB associations and their surrounding interstellar medium environment, using a population synthesis code. Methods: We developed a new population synthesis code for groups of massive stars, where we model the emission of different forms of energy and matter from the stars of the association. In particular, the
Voss, R. et al.Fecha de publicación:
92009 -
UV and optical variability of the low luminosity quasar PG 1351+64
PG 1351+64 is a bright radio quiet quasar (z = 0.088, mV ≅ 14). IUE observations obtained within few months in 1982 - 1983 showed variations in the 1200 - 2000 Å band up to a factor of 2. Since then the object has been monitored regularly. The observations of 1984 - 1986, including also archival data, have more than doubled the number of available
Tanzi, E. G. et al.Fecha de publicación:
91986 -
UV view of High Mass X-Ray Binary systems (what we know and perspectives for WSO-UV)
High Mass X-Ray Binary systems (HMXRB) are composed by a compact object orbiting around a OB massive star. The mass transfer which takes place from the massive star onto its compact companion is the responsible of the emission of high energy photons (X-rays) observed in these systems (to which they owe the name of their class). The presence of a
Blay, P.Fecha de publicación:
92011 -
uvby photometry of BH Vir (Clement+ 1997)
This paper presents new complete uvby light curves of the late-type detached eclipsing binary BH Vir (G0V + G5V, P=0.81687099d). This binary system has been observed during four campaigns at the Calar Alto Observatory (Almeria, Spain) and at the European Southern Observatory (La Silla, Chile). This observations are part of a 6 year uvby and H{beta}
Clement, R. et al.Fecha de publicación:
91996