%0 Generic %1 teich2016shield %A Teich, Yaron G. %A McNichols, Andrew T. %A Nims, Elise %A Cannon, John M. %A Adams, Elizabeth A. K. %A Bernstein-Cooper, Elijah Z. %A Giovanelli, Riccardo %A Haynes, Martha P. %A Józsa, Gyula I. G. %A McQuinn, Kristen B. W. %A Salzer, John J. %A Skillman, Evan D. %A Warren, Steven R. %A Dolphin, Andrew %A Elson, E. C. %A Haurberg, Nathalie %A Ott, Jürgen %A Saintonge, Amelie %A Cave, Ian %A Hagen, Cedric %A Huang, Shan %A Janowiecki, Steven %A Marshall, Melissa V. %A Thomann, Clara M. %A Van Sistine, Angela %D 2016 %K galaxies gas law low mass sfr %T SHIELD: Comparing Gas and Star Formation in Low Mass Galaxies %U http://arxiv.org/abs/1609.05375 %X We analyze the relationships between atomic, neutral hydrogen (HI) and star formation (SF) in the 12 low-mass SHIELD galaxies. We compare high spectral (~0.82 km/s/channel) and spatial resolution (physical resolutions of 170 pc - 700 pc) HI imaging from the VLA with Hand far-ultraviolet imaging. We quantify the degree of co-spatiality between star forming regions and regions of high HI column densities. We calculate the global star formation efficiencies (SFE, $\Sigma_SFR$ / $\Sigma_HI$), and examine the relationships among the SFE and HI mass, HI column density, and star formation rate (SFR). The systems are consuming their cold neutral gas on timescales of order a few Gyr. While we derive an index for the Kennicutt-Schmidt relation of N ~ 0.68 $\pm$ 0.04 for the SHIELD sample as a whole, the values of N vary considerably from system to system. By supplementing SHIELD results with those from other surveys, we find that HI mass and UV-based SFR are strongly correlated over five orders of magnitude. Identification of patterns within the SHIELD sample allows us to bin the galaxies into three general categories: 1) mainly co-spatial HI and SF regions, found in systems with highest peak HI column densities and highest total HI masses, 2) moderately correlated HI and SF regions, found in systems with moderate HI column densities, and 3) obvious offsets between HI and SF peaks, found in systems with the lowest total HI masses. SF in these galaxies is dominated by stochasticity and random fluctuations in their ISM.

@misc{teich2016shield, abstract = {We analyze the relationships between atomic, neutral hydrogen (HI) and star formation (SF) in the 12 low-mass SHIELD galaxies. We compare high spectral (~0.82 km/s/channel) and spatial resolution (physical resolutions of 170 pc - 700 pc) HI imaging from the VLA with H\alpha and far-ultraviolet imaging. We quantify the degree of co-spatiality between star forming regions and regions of high HI column densities. We calculate the global star formation efficiencies (SFE, $\Sigma_{\rm SFR}$ / $\Sigma_{\rm HI}$), and examine the relationships among the SFE and HI mass, HI column density, and star formation rate (SFR). The systems are consuming their cold neutral gas on timescales of order a few Gyr. While we derive an index for the Kennicutt-Schmidt relation of N ~ 0.68 $\pm$ 0.04 for the SHIELD sample as a whole, the values of N vary considerably from system to system. By supplementing SHIELD results with those from other surveys, we find that HI mass and UV-based SFR are strongly correlated over five orders of magnitude. Identification of patterns within the SHIELD sample allows us to bin the galaxies into three general categories: 1) mainly co-spatial HI and SF regions, found in systems with highest peak HI column densities and highest total HI masses, 2) moderately correlated HI and SF regions, found in systems with moderate HI column densities, and 3) obvious offsets between HI and SF peaks, found in systems with the lowest total HI masses. SF in these galaxies is dominated by stochasticity and random fluctuations in their ISM.}, added-at = {2016-09-20T09:40:03.000+0200}, author = {Teich, Yaron G. and McNichols, Andrew T. and Nims, Elise and Cannon, John M. and Adams, Elizabeth A. K. and Bernstein-Cooper, Elijah Z. and Giovanelli, Riccardo and Haynes, Martha P. and Józsa, Gyula I. G. and McQuinn, Kristen B. W. and Salzer, John J. and Skillman, Evan D. and Warren, Steven R. and Dolphin, Andrew and Elson, E. C. and Haurberg, Nathalie and Ott, Jürgen and Saintonge, Amelie and Cave, Ian and Hagen, Cedric and Huang, Shan and Janowiecki, Steven and Marshall, Melissa V. and Thomann, Clara M. and Van Sistine, Angela}, biburl = {https://www.bibsonomy.org/bibtex/297a85aef16d889a758b2d80d4bdf7e34/miki}, description = {[1609.05375] SHIELD: Comparing Gas and Star Formation in Low Mass Galaxies}, interhash = {1e953ebe5c4e4dfd8db5be4153b06086}, intrahash = {97a85aef16d889a758b2d80d4bdf7e34}, keywords = {galaxies gas law low mass sfr}, note = {cite arxiv:1609.05375Comment: Accepted for publication by the Astrophysical Journal, high-resolution version and survey data available at https://www.macalester.edu/~jcannon/shield/}, timestamp = {2016-09-20T09:40:03.000+0200}, title = {SHIELD: Comparing Gas and Star Formation in Low Mass Galaxies}, url = {http://arxiv.org/abs/1609.05375}, year = 2016 }