%0 Generic %1 kapala2014survey %A Kapala, M. J. %A Sandstrom, K. %A Groves, B. %A Croxall, K. %A Kreckel, K. %A Dalcanton, J. %A Leroy, A. %A Schinnerer, E. %A Walter, F. %A Fouesneau, M. %D 2014 %K SFR [CII] correlation scale small %T The Survey of Lines in M31 (SLIM): Investigating the Origins of CII Emission %U http://arxiv.org/abs/1410.6158 %X The CII 158 micron line is one of the strongest emission lines observed in star-forming galaxies, and has been empirically measured to correlate with the star formation rate (SFR) globally and on ~kpc scales. However, due to the multi-phase origins of CII, one might expect this relation to break down at small scales. We investigate the origins of CII emission by examining high spatial resolution observations of CII in M31, with the Survey of Lines in M31 (SLIM). We present five ~700x700 pc (3"x3") Fields mapping the CII emission, Halpha emission, combined with ancillary infrared (IR) data. We spatially separate star-forming regions from diffuse gas and dust emission on ~50 pc scales. We find that the CII - SFR correlation holds even at these scales, although the relation typically has a flatter slope than found at larger (~kpc) scales. While the Halpha emission in M31 is concentrated in the SFR regions, we find that a significant amount (~20-90%) of the CII emission comes from outside star-forming regions, and that the total IR (TIR) emission has the highest diffuse fraction of all SFR tracers. We find a weak correlation of the CII/TIR to dust color in each Field, and find a large scale trend of increasing CII/TIR with galactocentric radius. The differences in the relative diffuse fractions of CII, Halpha and IR tracers are likely caused by a combination of energetic photon leakage from HII regions and heating by the diffuse radiation field arising from older (B-star) stellar populations. However, we find that by averaging our measurements over ~kpc scales, these effects are minimized, and the relation between CII and SFR found in other nearby galaxy studies is retrieved.

@misc{kapala2014survey, abstract = {The [CII] 158 micron line is one of the strongest emission lines observed in star-forming galaxies, and has been empirically measured to correlate with the star formation rate (SFR) globally and on ~kpc scales. However, due to the multi-phase origins of [CII], one might expect this relation to break down at small scales. We investigate the origins of [CII] emission by examining high spatial resolution observations of [CII] in M31, with the Survey of Lines in M31 (SLIM). We present five ~700x700 pc (3"x3") Fields mapping the [CII] emission, Halpha emission, combined with ancillary infrared (IR) data. We spatially separate star-forming regions from diffuse gas and dust emission on ~50 pc scales. We find that the [CII] - SFR correlation holds even at these scales, although the relation typically has a flatter slope than found at larger (~kpc) scales. While the Halpha emission in M31 is concentrated in the SFR regions, we find that a significant amount (~20-90%) of the [CII] emission comes from outside star-forming regions, and that the total IR (TIR) emission has the highest diffuse fraction of all SFR tracers. We find a weak correlation of the [CII]/TIR to dust color in each Field, and find a large scale trend of increasing [CII]/TIR with galactocentric radius. The differences in the relative diffuse fractions of [CII], Halpha and IR tracers are likely caused by a combination of energetic photon leakage from HII regions and heating by the diffuse radiation field arising from older (B-star) stellar populations. However, we find that by averaging our measurements over ~kpc scales, these effects are minimized, and the relation between [CII] and SFR found in other nearby galaxy studies is retrieved.}, added-at = {2014-10-24T09:52:28.000+0200}, author = {Kapala, M. J. and Sandstrom, K. and Groves, B. and Croxall, K. and Kreckel, K. and Dalcanton, J. and Leroy, A. and Schinnerer, E. and Walter, F. and Fouesneau, M.}, biburl = {https://www.bibsonomy.org/bibtex/26b7397ef7bf7062121803777a8797f6b/miki}, description = {[1410.6158] The Survey of Lines in M31 (SLIM): Investigating the Origins of [CII] Emission}, interhash = {9b4ec39ec45419941d3bf6fbb0dbbc53}, intrahash = {6b7397ef7bf7062121803777a8797f6b}, keywords = {SFR [CII] correlation scale small}, note = {cite arxiv:1410.6158Comment: 19 pages, 9 figures, 5 tables, accepted for publication in ApJ}, timestamp = {2014-10-24T09:52:28.000+0200}, title = {The Survey of Lines in M31 (SLIM): Investigating the Origins of [CII] Emission}, url = {http://arxiv.org/abs/1410.6158}, year = 2014 }