Attenuation modified by DIG and dust as seen in M31
Author
dc.contributor.author
Tomicic, Neven
Author
dc.contributor.author
Kreckel, Kathryn
Author
dc.contributor.author
Groves, Brent
Author
dc.contributor.author
Schinnerer, Eva
Author
dc.contributor.author
Sandstrom, Karin
Author
dc.contributor.author
Kapala, Maria
Author
dc.contributor.author
Blanc Mendiberri, Guillermo
Author
dc.contributor.author
Leroy, Adam
Admission date
dc.date.accessioned
2018-06-19T20:58:45Z
Available date
dc.date.available
2018-06-19T20:58:45Z
Publication date
dc.date.issued
2017
Cita de ítem
dc.identifier.citation
The Astrophysical Journal, 844: 155 (17pp), 2017
es_ES
Identifier
dc.identifier.other
10.3847/1538-4357/aa7b30
Identifier
dc.identifier.uri
https://repositorio.uchile.cl/handle/2250/149019
Abstract
dc.description.abstract
The spatial distribution of dust in galaxies affects the global attenuation, and hence inferred properties, of galaxies. We trace the spatial distribution of dust in five approximately kiloparsec fields of M31 by comparing optical attenuation with the total dust mass distribution. We measure the attenuation from the Balmer decrement using Integral Field Spectroscopy and the dust mass from Herschel far-IR observations. Our results show that M31's dust attenuation closely follows a foreground screen model, contrary to what was previously found in other nearby galaxies. By smoothing the M31 data, we find that spatial resolution is not the cause for this difference. Based on the emission-line ratios and two simple models, we conclude that previous models of dust/gas geometry need to include a weakly or non-attenuated diffuse ionized gas (DIG) component. Due to the variation of dust and DIG scale heights with galactic radius, we conclude that different locations in galaxies will have different vertical distributions of gas and dust and therefore different measured attenuation. The difference between our result in M31 with that found in other nearby galaxies can be explained by our fields in M31 lying at larger galactic radii than the previous studies that focused on the centers of galaxies.
es_ES
Patrocinador
dc.description.sponsorship
DFG
SCHI 536/8-2
KR 4598/1-2
1573
Australian Research Council
FT140101202
ONICYT/FONDECYT, Programa de Iniciacion, Folio
11150220
BMVIT (Austria)
ESA-PRODEX (Belgium)
CEA/CNES (France)
DLR (Germany)
ASI/INAF (Italy)
CICYT/MCYT (Spain)
CSA (Canada)
NAOC (China)
CEA (France)
CNES (France)
CNRS (France)
ASI (Italy)
MCINN (Spain)
SNSB (Sweden)
STFC (UK)
NASA (USA)
National Science Foundation
1615105
1615109
1653300