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| DOI | 10.1088/0004-637X/715/1/506 | ||||
| Año | 2010 | ||||
| Tipo | artículo de investigación |
Citas Totales
Autores Afiliación Chile
Instituciones Chile
% Participación
Internacional
Autores
Afiliación Extranjera
Instituciones
Extranjeras
Using infrared photometry from the Spitzer Space Telescope, we perform the first inventory of aromatic feature emission (also commonly referred to as polycyclic aromatic hydrocarbon emission) for a statistically complete sample of star-forming galaxies in the local volume. The photometric methodology involved is calibrated and demonstrated to recover the aromatic fraction of the Infrared Array Camera 8 mu m flux with a standard deviation of 6% for a training set of 40 SINGS galaxies (ranging from stellar to dust dominated) with both suitable mid-infrared Spitzer Infrared Spectrograph spectra and equivalent photometry. A potential factor of 2 improvement could be realized with suitable 5.5 mu m and 10 mu m photometry, such as what may be provided in the future by the James Webb Space Telescope. The resulting technique is then applied to mid-infrared photometry for the 258 galaxies from the Local Volume Legacy (LVL) survey, a large sample dominated in number by low-luminosity dwarf galaxies for which obtaining comparable mid-infrared spectroscopy is not feasible. We find the total LVL luminosity due to five strong aromatic features in the 8 mu m complex to be 2.47 x 10(10) L(circle dot) with a mean volume density of 8.8 x 10(6) L(circle dot) Mpc(-3). Twenty-four of the LVL galaxies, corresponding to a luminosity cut at M(B) = -18.22, account for 90% of the aromatic luminosity. Using oxygen abundances compiled from the literature for 129 of the 258 LVL galaxies, we find a correlation between metallicity and the aromatic-to-total infrared emission ratio but not the aromatic-to-total 8 mu m dust emission ratio. A possible explanation is that metallicity plays a role in the abundance of aromatic molecules relative to the total dust content, but other factors, such as star formation and/or the local radiation field, affect the excitation of those molecules.
| Ord. | Autor | Género | Institución - País |
|---|---|---|---|
| 1 | Marble, A. R. | - |
UNIV ARIZONA - Estados Unidos
The University of Arizona - Estados Unidos |
| 2 | Engelbracht, Charles | Hombre |
UNIV ARIZONA - Estados Unidos
The University of Arizona - Estados Unidos |
| 3 | van Zee, L. | Mujer |
Indiana Univ - Estados Unidos
Indiana University Bloomington - Estados Unidos |
| 4 | Dale, Daniel A. | Hombre |
UNIV WYOMING - Estados Unidos
University of Wyoming - Estados Unidos |
| 5 | Smith, J. T. | Hombre |
Univ Toledo - Estados Unidos
The University of Toledo - Estados Unidos |
| 6 | Gordon, K. | Hombre |
Space Telescope Sci Inst - Estados Unidos
STScI - Estados Unidos Space Telescope Science Institute - Estados Unidos |
| 7 | Wu, Y. | - |
CALTECH - Estados Unidos
California Institute of Technology - Estados Unidos |
| 8 | Lee, J. C. | Mujer |
Observatorio Las Campanas - Estados Unidos
Carnegie Observ - Estados Unidos Carnegie Observatories - Estados Unidos |
| 9 | Kennicutt, R. C. | Hombre |
UNIV CAMBRIDGE - Reino Unido
Institute of Astronomy - Reino Unido |
| 10 | Skillman, Evan D. | Hombre |
Univ Minnesota - Estados Unidos
University of Minnesota - Estados Unidos University of Minnesota Twin Cities - Estados Unidos |
| 11 | Johnson, L. Clifton | - |
UNIV WASHINGTON - Estados Unidos
University of Washington, Seattle - Estados Unidos University of Washington - Estados Unidos |
| 12 | Block, M. | - |
UNIV ARIZONA - Estados Unidos
The University of Arizona - Estados Unidos |
| 13 | Calzetti, Daniela | Mujer |
Univ Massachusetts - Estados Unidos
University of Massachusetts Amherst - Estados Unidos |
| 14 | Cohen, S. A. | - |
UNIV WYOMING - Estados Unidos
University of Wyoming - Estados Unidos |
| 15 | Lee, H. | - |
Observatorio Gemini - Chile
Gemini ObservatorySouthern Operations Center - Chile |
| 16 | Schuster, M. D. | - |
UNIV WYOMING - Estados Unidos
University of Wyoming - Estados Unidos |
| Fuente |
|---|
| National Science Foundation |
| National Aeronautics and Space Administration (NASA) |
| Science and Technology Facilities Council |
| Agradecimiento |
|---|
| This work is part of the Spitzer Space Telescope Legacy Science Program and was supported by National Aeronautics and Space Administration (NASA) through contract 1336000 issued by the Jet Propulsion Laboratory (JPL), California Institute of Technology (Caltech) under NASA contract 1407. Additionally, this publication makes use of data products from the Two Micron All Sky Survey, which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center (IPAC) at Caltech, funded by NASA and the National Science Foundation. This research has made use of the NASA/IPAC Extragalactic Database, which is operated by JPL/Caltech, under contract with NASA. Finally, we thank the referee for helpful comments and suggestions that resulted in an improved paper. |