Recurrence of the blue wing enhancements in the high ionization lines of SDSS 1004+4112 A

Details Recurrence of the blue wing enhancements in the high ionization lines of SDSS 1004+4112 A Recurrence of the blue wing enhancements in the high ionization lines of SDSS 1004+4112 A

2006-05-20

arxiv.org/abs/astro-ph/0605522v1

Astrophys.J. 645 (2006) L5-L8

Astronomy and Astrophysics

Astrophysics

4 pages, 5 figures

Scientific paper

10.1086/506147

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 May 2003 a blueward enhancement in the high ionization lines of SDSS 1004+4112A was detected and then faded. Our observations are the first to note a second event of similar characteristics less than one 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.

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