Lyman Edges in Quasar Spectra
نویسندگان
چکیده
منابع مشابه
Probing Reionization with Quasar Spectra: the Impact of the Intrinsic Lyman-α Emission Line Shape Uncertainty
Arguably the best hope of understanding the tail end of the reionization of the intergalactic medium (IGM) at redshift z > 6 is through the detection and characterization of the Gunn-Peterson (GP) damping wing absorption of the IGM in bright quasar spectra. However, the use of quasar spectra to measure the IGM damping wing requires a model of the quasar’s intrinsic Lyman-α emission line. Here w...
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We have obtained follow-up observations of the quasar pair LBQS 0107−025A,B and new observations of the nearby quasar LBQS 0107−0232 with the Hubble Space Telescope Faint Object Spectrograph. Extended wavelength coverage of LBQS 0107−025A and B using the G270H grating was also obtained. This triple system is unique in providing sensitivity to coherent Lyα absorption on transverse scales of appr...
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We present optical spectra of the most luminous known QSO HS 1946+7658 (zem = 3.051). Our spectra have both full wavelength coverage, 3240 – 10570 Å , and in selected regions, either high signal to noise ratio, SNR ≃ 40 – 100, or unusually high ∼ 10 km s resolution, and in parts of the Lyα forest and to the red of Lyα emission they are among the best published. We find 113 Lyα systems and six m...
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A new determination of the optical K(z) relation for QSOs is presented, derived from multiwavelength photometry of 25 low-redshift QSOs. The relation deviates strongly from the simple picture of single power law spectra as an overall description, but also from previous empirical determinations based on composite spectra. The deviations are particularly significant at low redshifts where K(z) dr...
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Observations of redshifted Lyman α (Lyα) forest absorption in the spectra of quasistellar objects (QSOs) provide a highly sensitive probe of the distribution of gaseous matter in the universe. Over the past two decades, optical spectroscopy with large ground-based telescopes, and more recently ultraviolet (UV) spectroscopy from space, have yielded a wealth of information on what appears to be a...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1989
ISSN: 0074-1809
DOI: 10.1017/s0074180900141981