Astronomy and Astrophysics – Astronomy
Scientific paper
May 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aas...186.2502k&link_type=abstract
American Astronomical Society, 186th AAS Meeting, #25.02; Bulletin of the American Astronomical Society, Vol. 27, p.848
Astronomy and Astrophysics
Astronomy
2
Scientific paper
We have obtained a very high SNR spectrum of QSO HS 1946+7658 (z = 3.051, V = 15.9) at a resolution of 7.8 km {displaystyle s(-1}) . We have full wavelength coverage over the Lyman Alpha forest region of the spectrum, with a signal-to-noise-ratio per pixel of 0.03 Angstroms \space from 10 at 3960 Angstroms \space to 100 at 4925 Angstroms. There are approximately 900 Lyman Alpha lines in this spectrum, which we have empirically categorized into six distinct types of lines. We have discovered two types of lines which have not been seen before; wave-like regions 500-1500 km {displaystyle s(-1}) long caused by groups of relatively low column density lines (N(H I) =~ 10(12.8) ), and local depressions in the continuum caused by single lines with extremely high temperatures (T =~ 10(6) K). We have fit the data with Voigt profiles, and from this analysis we present characteristic column densities, velocity dispersions, associated temperatures, and occurence frequency of different types of lines in the data.
Kirkman David
Tytler David
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