FUSE observations of the HeII Lyman alpha forest towards HS1700+6416

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dc.creatorReimers, D.
dc.creatorFechner, C.
dc.creatorKriss, G.
dc.creatorShull, M.
dc.creatorBaade, R.
dc.creatorMoos, W.
dc.creatorSongaila, A.
dc.creatorSimcoe, R.
dc.date2004-10-25
dc.date.accessioned2026-07-07T02:15:28Z
dc.date.available2026-07-07T02:15:28Z
dc.descriptionWe present FUSE observations of the HeII Lyman alpha forest in the redshift range 2.3 < z < 2.7 towards HS1700+6416. Between October 2002 and February 2003, the brightness of the QSO increased by a factor 2. Therefore, with an exposure time of 203 ks during orbital night, the quality of the resulting spectrum is comparable to the HE2347-4342 data. This second line of sight with a resolved HeII Lyman alpha forest reveals a similar variation of several orders of magnitude of the column density ratio eta = N(HeII)/N(HI) and confirms the results of previous studies. The well-known metal line spectrum of HS1700+6416 permits to examine the influence of metal line absorption on the HeII column densities.
dc.description3 pages, 3 figures, to appear in Astrophysics in the Far Ultraviolet: Five Years of Discovery with FUSE, ASP Conf. series, eds. G. Sonneborn, W. Moos & B-G Andersson
dc.identifierhttps://arxiv.org/abs/astro-ph/0410588
dc.identifierhttp://arxiv.org/abs/astro-ph/0410588
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/8421
dc.subjectAstrophysics
dc.titleFUSE observations of the HeII Lyman alpha forest towards HS1700+6416
dc.typetext

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