%0 Generic %1 wood2015supernovadriven %A Wood, Corey M. %A Tremonti, Christy A. %A Calzetti, Daniela %A Leitherer, Claus %A Chisholm, John %A Gallagher III, John S. %D 2015 %K absorption emission outflows supernova %T Supernova-Driven Outflows in NGC 7552: A Comparison of H-alpha and UV Tracers %U http://arxiv.org/abs/1507.00346 %X We investigate the supernova-driven galactic wind of the barred spiral galaxy NGC 7552, using both ground-based optical nebular emission lines and far-ultraviolet absorption lines measured with the Hubble Space Telescope Cosmic Origins Spectrograph. We detect broad (~300 km/s) blueshifted (-40 km/s) optical emission lines associated with the galaxy's kpc-scale star-forming ring. The broad line kinematics and diagnostic line ratios suggest that the H-alpha emission comes from clouds of high density gas entrained in a turbulent outflow. We compare the H-alpha emission line profile to the UV absorption line profile measured along a coincident sight line and find significant differences. The maximum blueshift of the H-alpha-emitting gas is ~290 km/s, whereas the UV line profile extends to blueshifts upwards of 1000 km/s. The mass outflow rate estimated from the UV is roughly nine times greater than that estimated from H-alpha. We argue that the H-alpha emission traces a cluster-scale outflow of dense, low velocity gas at the base of the large-scale wind. We suggest that UV absorption line measurements are therefore more reliable tracers of warm gas in starburst-driven outflows.

@misc{wood2015supernovadriven, abstract = {We investigate the supernova-driven galactic wind of the barred spiral galaxy NGC 7552, using both ground-based optical nebular emission lines and far-ultraviolet absorption lines measured with the Hubble Space Telescope Cosmic Origins Spectrograph. We detect broad (~300 km/s) blueshifted (-40 km/s) optical emission lines associated with the galaxy's kpc-scale star-forming ring. The broad line kinematics and diagnostic line ratios suggest that the H-alpha emission comes from clouds of high density gas entrained in a turbulent outflow. We compare the H-alpha emission line profile to the UV absorption line profile measured along a coincident sight line and find significant differences. The maximum blueshift of the H-alpha-emitting gas is ~290 km/s, whereas the UV line profile extends to blueshifts upwards of 1000 km/s. The mass outflow rate estimated from the UV is roughly nine times greater than that estimated from H-alpha. We argue that the H-alpha emission traces a cluster-scale outflow of dense, low velocity gas at the base of the large-scale wind. We suggest that UV absorption line measurements are therefore more reliable tracers of warm gas in starburst-driven outflows.}, added-at = {2015-07-03T09:52:37.000+0200}, author = {Wood, Corey M. and Tremonti, Christy A. and Calzetti, Daniela and Leitherer, Claus and Chisholm, John and Gallagher III, John S.}, biburl = {https://www.bibsonomy.org/bibtex/20e274c4fe96bfe4e584c21a24ab70154/miki}, description = {[1507.00346] Supernova-Driven Outflows in NGC 7552: A Comparison of H-alpha and UV Tracers}, interhash = {a9e51935a277fd85b88405428b66aa04}, intrahash = {0e274c4fe96bfe4e584c21a24ab70154}, keywords = {absorption emission outflows supernova}, note = {cite arxiv:1507.00346Comment: 19 pages, 13 figures. Accepted for publication in Monthly Notices of the Royal Astronomical Society}, timestamp = {2015-07-03T09:52:37.000+0200}, title = {Supernova-Driven Outflows in NGC 7552: A Comparison of H-alpha and UV Tracers}, url = {http://arxiv.org/abs/1507.00346}, year = 2015 }