%0 Generic %1 Sánchez-Gallego2012 %A Sánchez-Gallego, J. R. %A Knapen, J. H. %A Wilson, C. D. %A Barmby, P. %A Azimlu, M. %A Courteau, S. %D 2012 %K Halpha galaxies nearby survey %T The JCMT Nearby Galaxies Legacy Survey VII: H\alpha imaging and massive star formation properties %U http://arxiv.org/abs/1203.0001 %X We present H\alpha fluxes, star formation rates (SFRs) and equivalent widths (EWs) for a sample of 156 nearby galaxies observed in the 12CO J=3-2 line as part of the James Clerk Maxwell Telescope Nearby Galaxies Legacy Survey. These are derived from images and values in the literature and from new H\alpha images for 72 galaxies which we publish here. We describe the sample, observations and procedures to extract the H\alpha fluxes and related quantities. We discuss the SFR properties of our sample and confirm the well-known correlation with galaxy luminosity, albeit with high dispersion. Our SFRs range from 0.1 to 11 Msun yr-1 with a median SFR value for the complete sample of 0.2 Msun yr-1. This median values is somewhat lower than similar published measurements, which we attribute, in part, to our sample being HI-selected and, thus, not biased towards high SFRs as has frequently been the case in previous studies. Additionally, we calculate internal absorptions for the H\alpha line, A(H\alpha), which are lower than many of those used in previous studies. Our derived EWs, which range from 1 to 880\AA with a median value of 27\AA, show little dependence with luminosity but rise by a factor of five from early- to late-type galaxies. This paper is the first in a series aimed at comparing SFRs obtained from H\alpha imaging of galaxies with information derived from other tracers of star formation and atomic and molecular gas.

@misc{Sánchez-Gallego2012, abstract = { We present H\alpha{} fluxes, star formation rates (SFRs) and equivalent widths (EWs) for a sample of 156 nearby galaxies observed in the 12CO J=3-2 line as part of the James Clerk Maxwell Telescope Nearby Galaxies Legacy Survey. These are derived from images and values in the literature and from new H\alpha{} images for 72 galaxies which we publish here. We describe the sample, observations and procedures to extract the H\alpha{} fluxes and related quantities. We discuss the SFR properties of our sample and confirm the well-known correlation with galaxy luminosity, albeit with high dispersion. Our SFRs range from 0.1 to 11 Msun yr-1 with a median SFR value for the complete sample of 0.2 Msun yr-1. This median values is somewhat lower than similar published measurements, which we attribute, in part, to our sample being HI-selected and, thus, not biased towards high SFRs as has frequently been the case in previous studies. Additionally, we calculate internal absorptions for the H\alpha{} line, A(H\alpha{}), which are lower than many of those used in previous studies. Our derived EWs, which range from 1 to 880\AA{} with a median value of 27\AA{}, show little dependence with luminosity but rise by a factor of five from early- to late-type galaxies. This paper is the first in a series aimed at comparing SFRs obtained from H\alpha{} imaging of galaxies with information derived from other tracers of star formation and atomic and molecular gas. }, added-at = {2012-03-02T18:14:04.000+0100}, author = {Sánchez-Gallego, J. R. and Knapen, J. H. and Wilson, C. D. and Barmby, P. and Azimlu, M. and Courteau, S.}, biburl = {https://www.bibsonomy.org/bibtex/23cef13446a104009ebd4e040da2e8fdc/miki}, description = {[1203.0001] The JCMT Nearby Galaxies Legacy Survey VII: H\alpha{} imaging and massive star formation properties}, interhash = {9be6a520f26440c3f4007ff02f6c9077}, intrahash = {3cef13446a104009ebd4e040da2e8fdc}, keywords = {Halpha galaxies nearby survey}, note = {cite arxiv:1203.0001 Comment: Accepted for publication in MNRAS. 47 pages, 18 figures}, timestamp = {2012-03-02T18:14:04.000+0100}, title = {The JCMT Nearby Galaxies Legacy Survey VII: H\alpha{} imaging and massive star formation properties}, url = {http://arxiv.org/abs/1203.0001}, year = 2012 }