2012ApJ...748L..11R -
Astrophys. J., 748, L11 (2012/March-3)
Interstellar sodium and calcium absorption toward SN 2011dh in M51.
RITCHEY A.M. and WALLERSTEIN G.
Abstract (from CDS):
We present high-resolution echelle observations of SN 2011dh, which exploded in the nearby, nearly face-on spiral galaxy M51. Our data, acquired on three nights when the supernova was near maximum brightness, reveal multiple absorption components in Na I D and Ca II H and K, which we identify with gaseous material in the Galactic disk or low halo and in the disk and halo of M51. The M51 components span a velocity range of over 140 km/s, extending well beyond the range exhibited by H I 21 cm emission at the position of the supernova. Since none of the prominent Na I or Ca II components appear to coincide with the peak in H I emission, the supernova may lie just in front of the bulk of the H I disk. The Na I/Ca II ratios for the components with the most extreme positive and negative velocities relative to the disk are ∼1.0, similar to those for more quiescent components, suggesting that the absorption originates in relatively cool gas. Production scenarios involving a galactic fountain and/or tidal interactions between M51 and its companion would be consistent with these results. The overall weakness of Na I D absorption in the direction of SN 2011dh confirms a low foreground and host galaxy extinction for the supernova.
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Journal keyword(s):
galaxies: individual: NGC 5194 - galaxies: ISM - ISM: abundances - ISM: atoms - supernovae: individual: SN 2011dh
Simbad objects:
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