Detalles de publicación

PP 06033

Recurrence of the Blue Wing Enhancements in the High-Ionization Lines of SDSS 1004+4112A

P. Gómez-Álvarez , E. Mediavilla , J. A. Muñoz , S. Arribas ,S. F. Sánchez , A. Oscoz , F. Prada , and M. Serra-Ricart
Instituto de Astrofísica de Canarias, Departamento de Astronomía y Astrofísica, Universidad de Valencia,Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, Space Telescope Division of the EuropeanInstituto de Astrofísica de Andalucia, CSIC, Space Agency, ESTEC,Consejo Superior de Investigaciones Científicas (CSIC),Astrophysikalisches Institut Postdam,Calar Alto Observatory, Centro Astronómico Hispano Aleman.
We present integral field spectroscopic observations of the quadruple-lensed QSO SDSS 1004+4112 taken with the fiber system INTEGRAL at the William Herschel Telescope on 2004 January 19. In 2003 May, a blueward enhancement in the high-ionization lines of SDSS 1004+4112A was detected, and then it faded. Our observations are the first to note a second event of similar characteristics less than 1 year after. Although initially attributed to microlensing, the resemblance among the spectra of both events and the absence of microlensing-induced changes in the continuum of component A are puzzling. The lack of a convincing explanation under the microlensing or intrinsic variability hypotheses makes the observed enhancements particularly relevant, calling for close monitoring of this object.

 
Aceptado para publicación en ApJL | Enviado el 2006-07-21 | Proyecto 6/88