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Diffuse Interstellar Bands in NGC 1448
Stockholm University, Faculty of Science, Department of Astronomy.
Stockholm University, Faculty of Science, Department of Astronomy.
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2005 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 429, 559-567 p.Article in journal (Refereed) Published
Abstract [en]

We present spectroscopic VLT/UVES observations of two emerging supernovae, the Type Ia SN 2001el and the Type II SN 2003hn, in the spiral galaxy NGC 1448. Our high resolution and high signal-to-noise spectra display atomic lines of Ca II, Na I, Ti II and K I in the host galaxy. In the line of sight towards SN 2001el, we also detect over a dozen diffuse interstellar bands (DIBs) within NGC 1448. These DIBs have strengths comparable to low reddening galactic lines of sight, albeit with some variations. In particular, a good match is found with the line of sight towards the σ type diffuse cloud (HD 144217). The DIBs towards SN 2003hn are significantly weaker, and this line of sight has also lower sodium column density. The DIB central velocities show that the DIBs towards SN 2001el are closely related to the strongest interstellar Ca II and Na I components, indicating that the DIBs are preferentially produced in the same cloud. The ratio of the λ 5797 and λ 5780 DIB strengths (r ˜ 0.14) suggests a rather strong UV field in the DIB environment towards SN 2001el. We also note that the extinction estimates obtained from the sodium lines using multiple line fitting agree with reddening estimates based on the colors of the Type Ia SN 2001el. Based on observations collected at the European Southern Observatory, Paranal, Chile (ESO Programmes 67.D-0227 and 71.D-0033). Table \ref{tb:ISfit} and Figs. \ref{fig:IS_MW} and \ref{fig:6284} are only available in electronic form at

Place, publisher, year, edition, pages
2005. Vol. 429, 559-567 p.
Keyword [en]
supernovae: individual: SN 2001el, SN 2003hn, galaxies: individual: NGC 1448, ISM: lines and bands, supernovae: general
Research subject
URN: urn:nbn:se:su:diva-30949DOI: 10.1051/0004-6361:20041465OAI: diva2:274786
Available from: 2009-11-01 Created: 2009-11-01 Last updated: 2011-02-15Bibliographically approved

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Sollerman, J.Mattila, S.Lundqvist, P.
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