%0 Generic %1 johnson2013probing %A Johnson, Sean D. %A Chen, Hsiao-Wen %A Mulchaey, John S. %D 2013 %K cgm dwarf igm ovi %R 10.1093/mnras/stt1137 %T Probing the IGM-galaxy connection at z<0.5 II. New insights into the galaxy environments of OVI absorbers in PKS 0405-123 %U http://arxiv.org/abs/1308.2681 %X We present new absorption-line analysis and new galaxy survey data obtained for the field around PKS0405-123 at z=0.57. Combining previously known OVI absorbers with new identifications in the higher S/N UV spectra obtained with COS, we have established a sample of 7 OVI absorbers and 12 individual components at z=0.0918-0.495 along the sightline toward PKS0405-123. We complement the available UV absorption spectra with galaxy survey data that reach 100% completeness at projected distances rho<200 kpc of the quasar sightline for galaxies as faint as 0.1L* (0.2L*) out to redshifts of z=0.35 (z=0.5). The high level of completeness achieved at faint magnitudes by our survey reveals that OVI absorbers are closely associated with gas-rich environments containing at least one low-mass, emission-line galaxy. An intriguing exception is a strong OVI system at z=0.183 that does not have a galaxy found at rho<4 Mpc, and our survey rules out the presence of any galaxies of L>0.04L* at rho<250 kpc and any galaxies of L>0.3L* at rho<1 Mpc. We further examine the galactic environments of OVI absorbers and those "Lya-only" absorbers with HI column density log N(HI)>13.6 and no detectable OVI absorption features. The Lya-only absorbers serve as a control sample in seeking the discriminating galactic features that result in the observed OVI absorbing gas at large galactic radii. We find a clear distinction in the radial profiles of mean galaxy surface brightness around different absorbers. Specifically, OVI absorbers are found to reside in regions of higher mean surface brightness at rho<500 kpc (+5 mag Mpc^-2 relative to the background), while only a mild increase in galaxy surface brightness is seen at small rho around Lya-only absorbers (+2 mag Mpc^-2). The additional insights gained from our deep galaxy survey demonstrates the need to probe to low luminosities to better understand absorbing systems.

@misc{johnson2013probing, abstract = {We present new absorption-line analysis and new galaxy survey data obtained for the field around PKS0405-123 at z=0.57. Combining previously known OVI absorbers with new identifications in the higher S/N UV spectra obtained with COS, we have established a sample of 7 OVI absorbers and 12 individual components at z=0.0918-0.495 along the sightline toward PKS0405-123. We complement the available UV absorption spectra with galaxy survey data that reach 100% completeness at projected distances rho<200 kpc of the quasar sightline for galaxies as faint as 0.1L* (0.2L*) out to redshifts of z=0.35 (z=0.5). The high level of completeness achieved at faint magnitudes by our survey reveals that OVI absorbers are closely associated with gas-rich environments containing at least one low-mass, emission-line galaxy. An intriguing exception is a strong OVI system at z=0.183 that does not have a galaxy found at rho<4 Mpc, and our survey rules out the presence of any galaxies of L>0.04L* at rho<250 kpc and any galaxies of L>0.3L* at rho<1 Mpc. We further examine the galactic environments of OVI absorbers and those "Lya-only" absorbers with HI column density log N(HI)>13.6 and no detectable OVI absorption features. The Lya-only absorbers serve as a control sample in seeking the discriminating galactic features that result in the observed OVI absorbing gas at large galactic radii. We find a clear distinction in the radial profiles of mean galaxy surface brightness around different absorbers. Specifically, OVI absorbers are found to reside in regions of higher mean surface brightness at rho<500 kpc (+5 mag Mpc^-2 relative to the background), while only a mild increase in galaxy surface brightness is seen at small rho around Lya-only absorbers (+2 mag Mpc^-2). The additional insights gained from our deep galaxy survey demonstrates the need to probe to low luminosities to better understand absorbing systems.}, added-at = {2013-08-14T07:10:55.000+0200}, author = {Johnson, Sean D. and Chen, Hsiao-Wen and Mulchaey, John S.}, biburl = {https://www.bibsonomy.org/bibtex/2561671f02502b5f542bde75e0c702307/miki}, description = {[1308.2681] Probing the IGM-galaxy connection at z&lt;0.5 II. New insights into the galaxy environments of OVI absorbers in PKS 0405-123}, doi = {10.1093/mnras/stt1137}, interhash = {2c009489715c785d87608c56b9448182}, intrahash = {561671f02502b5f542bde75e0c702307}, keywords = {cgm dwarf igm ovi}, note = {cite arxiv:1308.2681Comment: 16 pages, 7 figures; accepted to Monthly Notices of the Royal Astronomical Society}, timestamp = {2013-08-14T07:10:56.000+0200}, title = {Probing the IGM-galaxy connection at z<0.5 II. New insights into the galaxy environments of OVI absorbers in PKS 0405-123}, url = {http://arxiv.org/abs/1308.2681}, year = 2013 }