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25 April 2024 |
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Supernova-Driven Outflows in NGC 7552: A Comparison of H-alpha and UV Tracers | | Corey M. Wood
; Christy A. Tremonti
; Daniela Calzetti
; Claus Leitherer
; John Chisholm
; John S. Gallagher III
; | | Date: |
1 Jul 2015 | | 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. | | Source: | arXiv, 1507.0346 | | Services: | Forum | Review | PDF | Favorites | |
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