%0 Generic %1 mcquinn2017galactic %A McQuinn, Kristen B. W. %A Skillman, Evan D. %A Heliman, Taryn N. %A Mitchell, Noah P. %A Kelley, Tyler %D 2017 %K galaxies low mass outflow timescale %T Galactic Outflows, Star Formation Histories, and Timescales in Starburst Dwarf Galaxies from STARBIRDS %U http://arxiv.org/abs/1705.04692 %X Winds are predicted to be ubiquitous in low-mass, actively star-forming galaxies. Observationally, winds have been detected in relatively few local dwarf galaxies, with even fewer constraints placed on their timescales. Here, we compare galactic outflows traced by diffuse, soft X-ray emission from Chandra Space Telescope archival observations to the star formation histories derived from Hubble Space Telescope imaging of the resolved stellar populations in six starburst dwarfs. We constrain the longevity of a wind to be of order 25 Myr based on galaxies whose starburst activity has already declined, although a larger sample is needed to confirm this result. Compared to estimates from spiral galaxies, we find a higher average efficiency for converting the mechanical energy of stellar feedback to thermal, soft X-ray emission. The outflows have likely been sustained for timescales comparable to the duration of the starbursts (i.e., 100's Myr), after taking into account the time for the development and cessation of the wind. The wind timescales imply that material is driven to larger distances in the circumgalactic medium than previously thought from assuming 5-10 Myr starburst durations, and that less material is recycled back to the host galaxy on short timescales. In the detected outflows, the expelled hot gas shows various morphologies which are not consistent with a simple biconical outflow structure. The sample and analysis are part of a larger program, the STARBurst IRregular Dwarf Survey (STARBIRDS), aimed at understanding the lifecycle and impact of starburst activity in low-mass systems.

@misc{mcquinn2017galactic, abstract = {Winds are predicted to be ubiquitous in low-mass, actively star-forming galaxies. Observationally, winds have been detected in relatively few local dwarf galaxies, with even fewer constraints placed on their timescales. Here, we compare galactic outflows traced by diffuse, soft X-ray emission from Chandra Space Telescope archival observations to the star formation histories derived from Hubble Space Telescope imaging of the resolved stellar populations in six starburst dwarfs. We constrain the longevity of a wind to be of order 25 Myr based on galaxies whose starburst activity has already declined, although a larger sample is needed to confirm this result. Compared to estimates from spiral galaxies, we find a higher average efficiency for converting the mechanical energy of stellar feedback to thermal, soft X-ray emission. The outflows have likely been sustained for timescales comparable to the duration of the starbursts (i.e., 100's Myr), after taking into account the time for the development and cessation of the wind. The wind timescales imply that material is driven to larger distances in the circumgalactic medium than previously thought from assuming 5-10 Myr starburst durations, and that less material is recycled back to the host galaxy on short timescales. In the detected outflows, the expelled hot gas shows various morphologies which are not consistent with a simple biconical outflow structure. The sample and analysis are part of a larger program, the STARBurst IRregular Dwarf Survey (STARBIRDS), aimed at understanding the lifecycle and impact of starburst activity in low-mass systems.}, added-at = {2017-05-16T10:32:39.000+0200}, author = {McQuinn, Kristen B. W. and Skillman, Evan D. and Heliman, Taryn N. and Mitchell, Noah P. and Kelley, Tyler}, biburl = {https://www.bibsonomy.org/bibtex/22e5ca1d17635ac0102b129fb3373616d/miki}, description = {[1705.04692] Galactic Outflows, Star Formation Histories, and Timescales in Starburst Dwarf Galaxies from STARBIRDS}, interhash = {28b119bba0f24b347af5b22a2affa872}, intrahash = {2e5ca1d17635ac0102b129fb3373616d}, keywords = {galaxies low mass outflow timescale}, note = {cite arxiv:1705.04692Comment: 14 pages, 7 figures, 5 tables}, timestamp = {2017-05-16T10:32:39.000+0200}, title = {Galactic Outflows, Star Formation Histories, and Timescales in Starburst Dwarf Galaxies from STARBIRDS}, url = {http://arxiv.org/abs/1705.04692}, year = 2017 }