Absorption of the light of quasars due to inter-galactic neutral Hydrogen, introducing a correction factor

Details Absorption of the light of quasars due to inter-galactic neutral Hydrogen, introducing a correction factor Absorption of the light of quasars due to inter-galactic neutral Hydrogen, introducing a correction factor

Jul 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sf2a.conf..284a&link_type=abstract

SF2A-2007: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics held in Grenoble, France, July

Astronomy and Astrophysics

Astrophysics

Scientific paper

The numerous absorption lines seen in the spectra of distant quasars (QSOs), the so-called Lyα forest, reveal the inter-galactic medium (IGM) up to redshifts larger than 6. The main goal in studying the Lyα forest in QSO spectra is to determine the underlying matter distribution in the IGM. One of the key parameters is the total amount of absorption by neutral Hydrogen. In order to measure this absorption we must first determine the QSO continuum in the Lyα forest. This is not obvious specially at low spectral resolution and high redshift where there is little unabsorbed continuum remaining in the Lyα forest. Therefore we have observed 22 high redshift highly luminous QSOs at intermediate spectral resolution, to apply the different methods of determining the QSO continuum to our QSO sample. We measured the amount of absorption, known as the flux decrement, DA, in the Lyα forest for these different methods and compared the results. This quantifies the systematic uncertainties related to the choice of the method employed to derive the continuum. By comparing measured DA from high and intermediate spectral resolution spectra, we can introduce a correction factor to be applied to the results of any automatic procedure.

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