%0 Generic %1 danforth2014hstcos %A Danforth, Charles W. %A Tilton, Evan M. %A Shull, J. Michael %A Keeney, Brian A. %A Stevans, Matthew %A Pieri, Matthew M. %A Stocke, John T. %A Savage, Blair D. %A France, Kevin %A Syphers, David %A Smith, Britton D. %A Green, James C. %A Froning, Cynthia %A Penton, Steven V. %A Osterman, Steven N. %D 2014 %K cos igm low-z lya metallicity ovi %T An HST/COS Survey of the Low-Redshift IGM. I. Survey, Methodology, & Overall Results %U http://arxiv.org/abs/1402.2655 %X We use high-quality, medium-resolution HST/COS observations of 75 UV-bright AGN at redshifts $z_AGN< 0.85$ to construct the largest survey of the low-redshift IGM to date. The catalog is comprised of 4369 individual extragalactic absorption lines of HI and 20 different metal ions grouped together into 2508 distinct redshift systems at $z_abs<0.75$ and represents a significant improvement in total redshift pathlength and weak line sensitivity over previous studies. The column-density distribution of HI systems is seen to evolve both in amplitude and slope at $z< 0.47$. We observe 985 metal lines in 354 systems, and find that the fraction of absorbers detected in metals is strongly dependent on HI column density. OVI absorbers appear to evolve in the same sense as the Ly$\alpha$ forest. A velocity-space two-point correlation function shows substantial clustering of HI absorbers on scales of $\Delta v=50-300\rm~km~s^-1$ with no significant clustering at larger $\Delta v$. Most of the clustering signal comes from the stronger ($N_HI>10^13.5~cm^-2$) absorbers particularly those with metal absorption. The full catalog of absorption lines and fully-reduced spectra is available via MAST as a high-level science product at http://archive.stsci.edu/prepds/igm/.

@misc{danforth2014hstcos, abstract = {We use high-quality, medium-resolution HST/COS observations of 75 UV-bright AGN at redshifts $z_{\rm AGN}< 0.85$ to construct the largest survey of the low-redshift IGM to date. The catalog is comprised of 4369 individual extragalactic absorption lines of HI and 20 different metal ions grouped together into 2508 distinct redshift systems at $z_{\rm abs}<0.75$ and represents a significant improvement in total redshift pathlength and weak line sensitivity over previous studies. The column-density distribution of HI systems is seen to evolve both in amplitude and slope at $z< 0.47$. We observe 985 metal lines in 354 systems, and find that the fraction of absorbers detected in metals is strongly dependent on HI column density. OVI absorbers appear to evolve in the same sense as the Ly$\alpha$ forest. A velocity-space two-point correlation function shows substantial clustering of HI absorbers on scales of $\Delta v=50-300\rm~km~s^{-1}$ with no significant clustering at larger $\Delta v$. Most of the clustering signal comes from the stronger ($N_{\rm HI}>10^{13.5}~\rm cm^{-2}$) absorbers particularly those with metal absorption. The full catalog of absorption lines and fully-reduced spectra is available via MAST as a high-level science product at http://archive.stsci.edu/prepds/igm/.}, added-at = {2014-02-13T10:20:25.000+0100}, author = {Danforth, Charles W. and Tilton, Evan M. and Shull, J. Michael and Keeney, Brian A. and Stevans, Matthew and Pieri, Matthew M. and Stocke, John T. and Savage, Blair D. and France, Kevin and Syphers, David and Smith, Britton D. and Green, James C. and Froning, Cynthia and Penton, Steven V. and Osterman, Steven N.}, biburl = {https://www.bibsonomy.org/bibtex/221d58368c47486e8eac07d50c14dd21f/miki}, description = {[1402.2655] An HST/COS Survey of the Low-Redshift IGM. I. Survey, Methodology, & Overall Results}, interhash = {06c163294323f5320181c5dcdd0014e8}, intrahash = {21d58368c47486e8eac07d50c14dd21f}, keywords = {cos igm low-z lya metallicity ovi}, note = {cite arxiv:1402.2655Comment: Submitted to ApJ. 22 pages in ApJ format, 13 figures, and 7 tables in one heck of a paper. Associated MAST high-level science product at http://archive.stsci.edu/prepds/igm/}, timestamp = {2014-02-13T10:20:25.000+0100}, title = {An HST/COS Survey of the Low-Redshift IGM. I. Survey, Methodology, & Overall Results}, url = {http://arxiv.org/abs/1402.2655}, year = 2014 }