L. G. Balázs, P. Mészáros, P. Ábrahám, A. Moór, and Cs. Kiss
FAR-INFRARED STUDY OF SNIA HOST GALAXIES (Poster)

FAR-INFRARED STUDY OF SNIA HOST GALAXIES

L. G. Balázs(1), P. Mészáros(2), P. Ábrahám(1), A. Moór(1), and Cs. Kiss(1)
(1)Konkoly Observatory, PO Box 67, H-1525 Budapest, Hungary
(2)Pensilvania State University, 525 Davey Laboratory, University Park,
PA 16802, USA

Recent observations of distant type Ia supernovae suggested the existance of a non-zero $\Lambda$ cosmological constant and lead to the concordance model of $\Omega_{\Lambda} \simeq 0.7$ and $\Omega_M \simeq 0.3$. However, spiral and irregular host galaxis may contain a significant amount of dust, and therefore the internal extinction in these galaxies may be systematically underestimated. This would mean that supernovae are apparently brighter and their Hubble-diagram did not show deviance from $\Lambda$=0 cosmological models.

We observed 50 high-z (0.1$\le$z$\le$1) SNIa host galaxies with the MIPS camera on board the Spitzer Space Telescope at the three protometric bands (24, 70 and 160 $\mu$m). The galaxies were selected to be detectable up to z$\approx$1. Their 24, 70 and 160$\mu$m Hubble-diagrams (redshift versus apparent brihtness) provide information about the dust content of the galaxies, and show whether the visible-light observations should be corrected for the unexpected dust content.