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- W3103078882 abstract "We observed a small sample of 5 radio-quiet QSOs with integral field spectroscopy to search for possible extended emission in the Ly$alpha$ line. We subtracted the QSO point sources using a simple PSF self-calibration technique that takes advantage of the simultaneous availability of spatial and spectral information. In 4 of the 5 objects we find no significant traces of extended Ly$alpha$ emission beyond the contribution of the QSO nuclei itself, while in UM 247 there is evidence for a weak and spatially quite compact excess in the Ly$alpha$ line at several kpc outside the nucleus. For all objects in our sample we estimated detection limits for extended, smoothly distributed Ly$alpha$ emission by adding fake nebulosities into the datacubes and trying to recover them after PSF subtraction. Our observations are consistent with other studies showing that giant Ly$alpha$ nebulae such as those found recently around some quasars are very rare. Ly$alpha$ fuzz around typical radio-quiet QSOs is fainter, less extended and is therefore much harder to detect. The faintness of these structures is consistent with the idea that radio-quiet QSOs typically reside in dark matter haloes of modest masses." @default.
- W3103078882 created "2020-11-23" @default.
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- W3103078882 date "2015-04-01" @default.
- W3103078882 modified "2023-09-24" @default.
- W3103078882 title "Where is the fuzz? Undetected Lymanαnebulae around quasars atz~ 2.3" @default.
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- W3103078882 doi "https://doi.org/10.1051/0004-6361/201425580" @default.
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