Other
Scientific paper
Aug 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003basbr..23r.165s&link_type=abstract
Boletim da Sociedade Astronômica Brasileira (ISSN 0101-3440), vol.23, no.1, p. 165-166
Other
Scientific paper
Using spectra of normal galaxies from the Early Data Relase of the Sloan Digital Sky Survey (SDSS) we have investigated the relations between the opacity of galaxies as derived from Ha/Hb with other global properties of the galaxies. Our main findings are that: 1) The nebular and stellar extinction are strongly correlated; 2) The logarithmic extinction at Hb, C(Hb), is linked with the galaxy spectral type and colour, decreasing from early- to late-types; 3) C(Hb) increases with increasing metallicity; 4) C(Hb) is, probably, also affected by the age of the stellar population, being larger in the case of older stellar populations; 5) C(Hb) depends on galaxy masses probably more than just because of the mass-luminosity relation; 6) C(Hb) does not depend on parameters linked to the morphology such as the concentration index or the galaxy surface brightness. These findings contrast with the common belief that late-type galaxies are more opaque. We have also cross-correlated our sample of SDSS galaxies with the IRAS data base. Due to the lower redshift limit imposed to our sample and to the detection limit of IRAS, such a procedure selected only luminous infrared galaxies. We found that correlations that were found by other authors between optical and infrared properties of galaxies disappear when resricting to luminous infrared galaxies. We also found that, statistically, the subsample of luminous infrared galaxies is indistinguishable from the sample of galaxies not detected by IRAS in all the optical properties we have examined.
Mateus Jr. A.
Sodre Laerte Jr.
Stasinska Grazina
Szczerba Ryszard
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