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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 730175.0, MPI für Astronomie / Publikationen_mpia
The survey of lines in M31 (SLIM): Investigating the origins of [C II] emission
Authors:Kapala, M. J.; Sandstrom, K.; Groves, B.; Croxall, K.; Kreckel, K.; Dalcanton, J.; Leroy, A.; Schinnerer, E.; Walter, F.; Fouesneau, M.
Date of Publication (YYYY-MM-DD):2015
Title of Journal:The Astrophysical Journal
Issue / Number:1
Start Page:id. 24 (18 pp)
Audience:Not Specified
Abstract / Description:The [C II] 158 μm 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 kiloparsec scales. However, because of the multiphase origins of [C II], one might expect this relation to break down at small scales. We investigate the origins of [C II] emission by examining high spatial resolution observations of [C II] in M31 with the Survey of Lines in M31. We present five ~700 × 700 pc (3' × 3') fields mapping the [C II] emission, Hα emission, and the ancillary infrared (IR) data. We spatially separate star-forming regions from diffuse gas and dust emission on ~50 pc scales. We find that the [C II]-SFR correlation holds even at these scales, although the relation typically has a flatter slope than found at larger (kiloparsec) scales. While the Hα emission in M31 is concentrated in the SFR regions, we find that a significant amount (~20%-90%) of the [C II] emission comes from outside star-forming regions and that the total IR emission (TIR) has the highest diffuse fraction of all SFR tracers. We find a weak correlation of the [C II]/TIR to dust color in each field and find a large-scale trend of increasing [C II]/TIR with galactocentric radius. The differences in the relative diffuse fractions of [C II], Hα, and
Free Keywords:galaxies: individual: M31; galaxies: ISM; galaxies: star formation; ISM: lines and bands; ISM: structure
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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