Damped lyman alpha system
Webz = 2.19 with a Damped Lyman Alpha System as a Natural Coronagraph Jiani Ding1, Zheng Cai2, J. Xavier Prochaska2,3, H. Finley4,5, Xiaohui Fan6, Zheng Zheng7, H. Fathivavsari8, and P. Petitjean8 1 Department of Astronomy and Astrophysics, UCO/Lick Observatory, University of California, 1156 High Street, Santa Cruz, CA 95064, USA WebWe present VLT/FORS2 spectroscopy and Gamma-ray Optical/Near-Infrared Detector optical/near-IR photometry of the afterglow of the bright Fermi/LAT GRB 090926A. The spectrum shows prominent Lyman-α absorption with N_H I = 10^{21.73± 0.07} cm -2 and a multitude of metal lines at a common redshift of z = 2.1062 ± 0.0004, which we associate …
Damped lyman alpha system
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WebAs a starting point, we use the BOSS DR9 Quasar Catalog (DR9Q). We make the following cuts on the catalog to select the objects suitable for Lyman-alpha forest analysis: S/N > 0.5 per pixel in 1268-1340 Å and S/N > 0.2 per pixel in 1041-1185 Å (restframe wavelengths) No more than 20% of pixels flagged by pipeline maskbit system. WebThe Ly$\alpha$ Forest can be used to trace the Dark Matter large scale structure of the Universe and its evolution. Damped Lyman $\alpha$ Absorber systems can be used as a tracer of galaxy formation history complementary to observations in emission, because DLAs are selected by size rather than luminosity.
WebMar 1, 2003 · By comparing the widths of absorption lines from OI, SiII and FeII in the redshift z=2.076 single-component damped Lyman alpha absorption system in the spectrum of Q2206-199 we establish that ... WebDamped Lyman-alpha systems. Utilizing the high-resolution, large-scale LAOZI cosmological simulations we investigate the nature of the metal-poor ( [Z/H]<-2) damped …
Web“Damped Lyman Alpha Systems” by Wolfe, Arthur M., Gawiser, E. and Prochaska, Jason X. Jean P. Walker Rutgers University Galaxy Formaon Seminar WebWe present the first detection of carbon monoxide (CO) in a damped Lyman-alpha system (DLA) at z_abs = 2.41837 toward SDSS J143912.04+111740.5. We also detected H2 and HD molecules.
WebWe present a catalogue of the 322 damped Lyman alpha absorbers taken from the literature. All damped Lyman alpha absorbers are included, with no selection on redshift or quasar magnitude. Of these, 123 are candidates and await confirmation using high resolution spectroscopy. For all 322 objects we catalogue the radio properties of the …
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