HST/STIS Spectroscopy of 3C 273

2001/09/06 by S. R. Heap, Heap, S. R., G. M. Williger +9
Physics and Astronomy · #Astrophysics (astro-ph) #FOS: Physical sciences #astro-ph

paper · pdf · doi:10.48550/arxiv.astro-ph/0109100

in "Extragalactic Gas at Low Redshfit", ASP Conf. Series, J. Mulchaey & J. Stocke, eds.; includes newpasp.sty

arxiv created 2001/09/06 · arxiv updated 2009/12/01

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.

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