%0 Generic %1 du2016kinematics %A Du, Xinnan %A Shapley, Alice E. %A Martin, Crystal L. %A Coil, Alison L. %D 2016 %K absorption civ composite galaxy %T The Kinematics of CIV in Star-Forming Galaxies at z~1.2 %U http://arxiv.org/abs/1604.03945 %X We present the first statistical sample of rest-frame far-UV spectra of star-forming galaxies at z~1. These spectra are unique in that they cover the high-ionization CIVłambdałambda1548, 1550 doublet. We also detect low-ionization features such as SiIIłambda1527, FeIIłambda1608, AlIIłambda1670, NiIIłambdałambda1741, 1751 and SiIIłambda1808, and intermediate-ionization features from AlIIIłambdałambda1854, 1862. Comparing the properties of absorption lines of lower- and higher- ionization states provides a window into the multi-phase nature of circumgalactic gas. Our sample is drawn from the DEEP2 survey and spans the redshift range 1.01 < z < 1.35 (<z> = 1.25). By isolating the interstellar CIV absorption from the stellar P-Cygni wind profile we find that 69% of the CIV profiles are blueshifted with respect to the systemic velocity. Furthermore, CIV shows a small but significant blueshift relative to FeII (offset of the best-fit linear regression -76 $\pm$ 26 km/s). At the same time, the CIV blueshift is on average comparable to that of MgIIłambdałambda2796, 2803. At this point, in explaining the larger blueshift of CIV absorption at the ~ 3-sigma level, we cannot distinguish between the faster motion of highly-ionized gas relative to gas traced by FeII, and filling in on the red side from resonant CIV emission. We investigate how far-UV interstellar absorption kinematics correlate with other galaxy properties using stacked spectra. These stacking results show a direct link between CIV absorption and the current SFR, though we only observe small velocity differences among different ionization states tracing the outflowing ISM.

@misc{du2016kinematics, abstract = {We present the first statistical sample of rest-frame far-UV spectra of star-forming galaxies at z~1. These spectra are unique in that they cover the high-ionization CIV{\lambda}{\lambda}1548, 1550 doublet. We also detect low-ionization features such as SiII{\lambda}1527, FeII{\lambda}1608, AlII{\lambda}1670, NiII{\lambda}{\lambda}1741, 1751 and SiII{\lambda}1808, and intermediate-ionization features from AlIII{\lambda}{\lambda}1854, 1862. Comparing the properties of absorption lines of lower- and higher- ionization states provides a window into the multi-phase nature of circumgalactic gas. Our sample is drawn from the DEEP2 survey and spans the redshift range 1.01 < z < 1.35 (<z> = 1.25). By isolating the interstellar CIV absorption from the stellar P-Cygni wind profile we find that 69% of the CIV profiles are blueshifted with respect to the systemic velocity. Furthermore, CIV shows a small but significant blueshift relative to FeII (offset of the best-fit linear regression -76 $\pm$ 26 km/s). At the same time, the CIV blueshift is on average comparable to that of MgII{\lambda}{\lambda}2796, 2803. At this point, in explaining the larger blueshift of CIV absorption at the ~ 3-sigma level, we cannot distinguish between the faster motion of highly-ionized gas relative to gas traced by FeII, and filling in on the red side from resonant CIV emission. We investigate how far-UV interstellar absorption kinematics correlate with other galaxy properties using stacked spectra. These stacking results show a direct link between CIV absorption and the current SFR, though we only observe small velocity differences among different ionization states tracing the outflowing ISM.}, added-at = {2016-04-15T10:39:25.000+0200}, author = {Du, Xinnan and Shapley, Alice E. and Martin, Crystal L. and Coil, Alison L.}, biburl = {https://www.bibsonomy.org/bibtex/2723331a83756d9f161f5616ef184971a/miki}, description = {[1604.03945] The Kinematics of CIV in Star-Forming Galaxies at z~1.2}, interhash = {9a5fab86e1cda1628fd7e410d658dfd5}, intrahash = {723331a83756d9f161f5616ef184971a}, keywords = {absorption civ composite galaxy}, note = {cite arxiv:1604.03945Comment: 21 pages, 14 figures, submitted to ApJ}, timestamp = {2016-04-15T10:39:25.000+0200}, title = {The Kinematics of CIV in Star-Forming Galaxies at z~1.2}, url = {http://arxiv.org/abs/1604.03945}, year = 2016 }