%0 Generic %1 keeney2017characterizing %A Keeney, Brian A. %A Stocke, John T. %A Danforth, Charles W. %A Shull, J. Michael %A Pratt, Cameron T. %A Froning, Cynthia S. %A Green, James C. %A Penton, Steven V. %A Savage, Blair D. %D 2017 %K CGM COS galaxies local %T Characterizing the Circumgalactic Medium of Nearby Galaxies with HST/COS and HST/STIS Absorption-Line Spectroscopy: II. Methods and Models %U http://arxiv.org/abs/1704.00235 %X We present basic data and modeling for a survey of the cool, photo-ionized Circum-Galactic Medium (CGM) of low-redshift galaxies using far-UV QSO absorption line probes. This survey consists of "targeted" and "serendipitous" CGM subsamples, originally described in Stocke et al. (2013, Paper 1). The targeted subsample probes low-luminosity, late-type galaxies at $z<0.02$ with small impact parameters ($łangle\rho= 71$ kpc), and the serendipitous subsample probes higher luminosity galaxies at $złesssim0.2$ with larger impact parameters ($łangle\rho= 222$ kpc). HST and FUSE UV spectroscopy of the absorbers and basic data for the associated galaxies, derived from ground-based imaging and spectroscopy, are presented. We find broad agreement with the COS-Halos results, but our sample shows no evidence for changing ionization parameter or hydrogen density with distance from the CGM host galaxy, probably because the COS-Halos survey probes the CGM at smaller impact parameters. We find at least two passive galaxies with H I and metal-line absorption, confirming the intriguing COS-Halos result that galaxies sometimes have cool gas halos despite no on-going star formation. Using a new methodology for fitting H I absorption complexes, we confirm the CGM cool gas mass of Paper 1, but this value is significantly smaller than found by the COS-Halos survey. We trace much of this difference to the specific values of the low-$z$ meta-galactic ionization rate assumed. After accounting for this difference, a best-value for the CGM cool gas mass is found by combining the results of both surveys to obtain $(M/M_ødot)=10.5\pm0.3$, or ~30% of the total baryon reservoir of an $L L^*$, star-forming galaxy.

@misc{keeney2017characterizing, abstract = {We present basic data and modeling for a survey of the cool, photo-ionized Circum-Galactic Medium (CGM) of low-redshift galaxies using far-UV QSO absorption line probes. This survey consists of "targeted" and "serendipitous" CGM subsamples, originally described in Stocke et al. (2013, Paper 1). The targeted subsample probes low-luminosity, late-type galaxies at $z<0.02$ with small impact parameters ($\langle\rho\rangle = 71$ kpc), and the serendipitous subsample probes higher luminosity galaxies at $z\lesssim0.2$ with larger impact parameters ($\langle\rho\rangle = 222$ kpc). HST and FUSE UV spectroscopy of the absorbers and basic data for the associated galaxies, derived from ground-based imaging and spectroscopy, are presented. We find broad agreement with the COS-Halos results, but our sample shows no evidence for changing ionization parameter or hydrogen density with distance from the CGM host galaxy, probably because the COS-Halos survey probes the CGM at smaller impact parameters. We find at least two passive galaxies with H I and metal-line absorption, confirming the intriguing COS-Halos result that galaxies sometimes have cool gas halos despite no on-going star formation. Using a new methodology for fitting H I absorption complexes, we confirm the CGM cool gas mass of Paper 1, but this value is significantly smaller than found by the COS-Halos survey. We trace much of this difference to the specific values of the low-$z$ meta-galactic ionization rate assumed. After accounting for this difference, a best-value for the CGM cool gas mass is found by combining the results of both surveys to obtain $\log{(M/M_{\odot})}=10.5\pm0.3$, or ~30% of the total baryon reservoir of an $L \geq L^*$, star-forming galaxy.}, added-at = {2017-04-04T09:58:48.000+0200}, author = {Keeney, Brian A. and Stocke, John T. and Danforth, Charles W. and Shull, J. Michael and Pratt, Cameron T. and Froning, Cynthia S. and Green, James C. and Penton, Steven V. and Savage, Blair D.}, biburl = {https://www.bibsonomy.org/bibtex/2f0c6493a8b120044783c8823e890d899/miki}, description = {[1704.00235] Characterizing the Circumgalactic Medium of Nearby Galaxies with HST/COS and HST/STIS Absorption-Line Spectroscopy: II. Methods and Models}, interhash = {cea66be38e2a6bb73f447186c62835a2}, intrahash = {f0c6493a8b120044783c8823e890d899}, keywords = {CGM COS galaxies local}, note = {cite arxiv:1704.00235Comment: 51 pages, 20 figures, 11 tables, accepted for publication in the Astrophysical Journal Supplement Series}, timestamp = {2017-04-04T09:58:48.000+0200}, title = {Characterizing the Circumgalactic Medium of Nearby Galaxies with HST/COS and HST/STIS Absorption-Line Spectroscopy: II. Methods and Models}, url = {http://arxiv.org/abs/1704.00235}, year = 2017 }