The Deepest Spectrum in the Universe? Line Emission from Lyman-alpha Clouds at z 3

Details The Deepest Spectrum in the Universe? Line Emission from Lyman-alpha Clouds at z 3 The Deepest Spectrum in the Universe? Line Emission from Lyman-alpha Clouds at z 3

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.5404b&link_type=abstract

American Astronomical Society, AAS Meeting #211, #54.04; Bulletin of the American Astronomical Society, Vol. 39, p.824

Astronomy and Astrophysics

Astronomy

Scientific paper

We present the results of an extremely deep long-slit optical spectroscopic search for low-luminosity Lyman-alpha emitters. Over several years we have accumulated 150-hours integration on a single field with 8-10m telescopes (VLT/FORS2, Gemini/GMOS and Keck/LRIS) at a spectral resolution of 300km/s. This is the deepest spectrum ever obtained - our 1 sigma sensitivity to line emission in a 1 arcsec2 aperture is 1019erg/cm2/s.
We have significant detections of 30 emission line objects, which are most likely Lyman-alpha emitters at 2.7In many cases these have large equivalent widths (i.e. weak or undetected continuum) which suggests this line emission may be powered by star formation in conditions of low metallicity and low dust, or alternatively may arise from cooling radiation or perhaps external photoionzation by the metagalactic Lyman continuum background. Many of the line emitters are significantly spatially extended (with median size 4arcsec, 30kpc) and could plausibly be the host population of the high column density Lyman-alpha absorption clouds seen in QSO spectra (the Damped Lyman-alpha Systems and the Lyman-Limit Systems).

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