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Title: | Understanding the 8 μm versus Paα Relationship on Subarcsecond Scales in Luminous Infrared Galaxies |
Authors: | Díaz-Santos, T. ![]() ![]() ![]() |
Keywords: | Galaxies: Nuclei Galaxies: Star Clusters Galaxies: Starburst Infrared: Galaxies |
Issue Date: | 20-Sep-2008 |
Publisher: | American Astronomical Society Institute of Physics Publishing |
Citation: | The Astrophysical Journal (ApJ) 685(1): 211-224 (2008) |
Abstract: | This work explores in detail the relation between the 8 μm and the Paα emissions for 122 H II regions identified in a sample of 10 low-z LIRGs with nearly constant metallicity [12+log(O/H)~8.8]. We use Gemini T-ReCS high spatial resolution (<~0.4"~120 pc for the average distance of 60 Mpc of our sample) mid-infrared imaging (at 8.7 or 10.3 μm), together with HST NICMOS continuum and Paα images. The LIRG H II regions extend the L8μm vs. LPaα relation found for H II knots in the high-metallicity SINGS galaxies by about 2 orders of magnitude to higher luminosities. Since the metallicity of the LIRG sample is nearly constant, we can rule out this effect as a cause for the scatter seen in the relationship. In turn, it is attributed to two effects: age and PAH features. The L8μm/LPaα ratio, which varies by a factor of 10 for the LIRG H II regions, is reproduced by a model with instantaneous star formation and ages ranging from ~4 to 7.5 Myr. The remaining dispersion around the model predictions for a given age is probably due to differential contributions of the PAH features (the 8.6 μm, in our case) to the 8 μm emission from galaxy to galaxy. |
Description: | 14 pages, 9 figures, 4 tables.-- Based on observations obtained with T-ReCS instrument at the Gemini South Observatory, which is operated by the Association of Universities for Research in Astronomy (AURA), Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: NSF (United States), PPARC (UK), NRC (Canada), CONICYT (Chile) ARC (Australia), CNPq (Brazil), and CONICET (Argentina).-- Also based on observations with the NASA/ESA Hubble Space Telescope, obtained from the data archive at the Space Telescope Science Institute, which is operated by AURA, Inc., under NASA contract NAS 5-266555. |
Publisher version (URL): | http://dx.doi.org/10.1086/588276 |
URI: | http://hdl.handle.net/10261/10837 |
DOI: | http://dx.doi.org/10.1086/588276 |
ISSN: | 0004-637X |
Appears in Collections: | (CFMAC-IEM) Artículos |
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File | Description | Size | Format | |
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TReCSimaging_LIRGs_paper2.pdf | 2,31 MB | Adobe PDF | ![]() View/Open |
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