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On the calibration of the COBE/IRAS dust emission reddening maps

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On the calibration of the COBE/IRAS dust emission reddening maps

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Título On the calibration of the COBE/IRAS dust emission reddening maps
Autor Dutra, Carlos Maximiliano
Ahumada, Andrea Veronica
Claria Olmedo, Juan Jose
Bica, Eduardo Luiz Damiani
Barbuy, Beatriz
Abstract In this work we study the spectral properties (3600–6800 Å) of the nuclear region of early-type galaxies at low (|b| < 25◦), intermediate (including surroundings of the Magellanic Clouds) and high (South Polar Cap) Galactic latitudes. We determine the E(B − V) reddening values of the galaxies by matching their continuum distribution with respect to those of reddening-free spectral galaxy templates with similar stellar populations. We also compare the spectroscopic reddening value of each galaxy with that derived from 100 μm dust emission (E(B−V)FIR) in its line of sight, and we find that there is agreement up to E(B − V) = 0.25. Beyond this limit E(B − V)FIR values are higher. Taking into account the data up to E(B − V) ≈ 0.7, we derive a calibration factor of 0.016 between the spectroscopic E(B − V) values and Schlegel et al.’s (1998) opacities. By combining this result with an AK extinction map built within ten degrees of the Galactic centre using Bulge giants as probes (Dutra et al. 2003), we extended the calibration of dust emission reddening maps to low Galactic latitudes down to |b| = 4◦ and E(B−V) = 1.6 (AV ≈ 5). According to this new calibration, a multiplicative factor of ≈0.75 must be applied to the COBE/IRAS dust emission reddening maps.
Contido em Astronomy and astrophysics. Berlin. Vol. 408, no. 1 (Sept. 2003), p. 287-295
Assunto Calibração
Centro galatico
Materia interestelar
Nuvens de magalhaes
Poeira cosmica
[en] Galaxies: ISM
[en] Galaxy: general
[en] ISM: dust, extinction
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/108025
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