HST/STIS Spectroscopy of 3C 273
Astrophysics
2007-05-23 v1
Abstract
We present preliminary results on the low-redshift Lyman alpha forest as based on STIS spectra of 3C 273. A total of 121 intergalactic Lyman alpha-absorbing systems were detected, of which 60 are above the 3.5 sigma completness limit, log N(HI)~12.3. The median Doppler parameter, b=27 km/s, is similar to that seen at high redshift. However the distribution of HI column densities (dN/dN(HI) propto N(HI)^-beta) has a steeper slope, beta = 2.02 +- 0.21, than is seen at high redshift. Overall, the observed N(HI)-b distribution is consistent with that derived from a Lambda CDM hydrodynamic simulation.
Cite
@article{arxiv.astro-ph/0109100,
title = {HST/STIS Spectroscopy of 3C 273},
author = {S. R. Heap and G. M. Williger and R. Dave and R. J. Weymann and E. B. Jenkins and T. M. Tripp},
journal= {arXiv preprint arXiv:astro-ph/0109100},
year = {2007}
}
Comments
in "Extragalactic Gas at Low Redshfit", ASP Conf. Series, J. Mulchaey & J. Stocke, eds.; includes newpasp.sty