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Home List of Titles The distance to NGC 1316 (Fornax A) from observations of four Type Ia supernovae
Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/150795
- The distance to NGC 1316 (Fornax A) from observations of four Type Ia supernovae
- Stritzinger, Maximilian; Burns, Christopher R.; Phillips, Mark M.; Folatelli, Gaston; Krisciunas, Kevin; Kattner, ShiAnne; Persson, Sven E.; Boldt, Luis; Campillay, Abdo; Contreras, Carlos; Krzeminski, Wojtek; Morrell, Nidia; Salgado, Francisco; Freedman, Wendy L.; Hamuy, Mario; Madore, Barry F.; Roth, Miguel; Suntzeff, Nicholas B.
- The giant elliptical galaxy NGC 1316 (Fornax A) is a well-studied member of the Fornax Cluster and a prolific producer of Type Ia supernovae (SNe Ia), having hosted four observed events since 1980. Here, we present detailed optical- and near-infrared light curves of the spectroscopically normal SN 2006dd. These data are used, along with previously published photometry of the normal SN 1980N and SN 1981D, and the fast-declining, low-luminosity SN 2006mr, to compute independent estimates of the host reddening for each SN, and the distance to NGC 1316. From the three normal SNe, we find a distance of 17.8 ± 0.3 (random) ± 0.3 (systematic) Mpc for Ho = 72. Distance moduli derived from the 'EBV' and Tripp methods give the values that are mutually consistent with 4%-8%. Moreover, the weighted means of the distance moduli for these three SNe for three methods agree to within 3%. This consistency is encouraging and supports the premise that Type Ia SNe are reliable distance indicators at the 5% precision level or better. On the other hand, the two methods used to estimate the distance of the fast-declining SN 2006mr both yield a distance to NGC 1316 which is 25%-30% larger. This disparity casts doubt on the suitability of fast-declining events for estimating extragalactic distances. Modest-to-negligible host galaxy reddening values are derived for all four SNe. Nevertheless, two of them (SN 2006dd and SN 2006mr) show strong Na I D interstellar lines in the host galaxy system. The strength of this absorption is completely inconsistent with the small reddening values derived from the SN light curves if the gas in NGC 1316 is typical of that found in the interstellar medium of the Milky Way. In addition, the equivalent width of the Na lines in SN 2006dd appears to have weakened significantly some 100-150 days after explosion.
- Publication type
- Journal article
- Research centre
- Swinburne University of Technology. Faculty of Information and Communication Technologies. Centre for Astrophysics and Supercomputing
- Astronomical Journal, Vol. 140, no. 6 (Dec 2010), pp. 2036-2051
- Publication year
- FOR Code(s)
- 0201 Astronomical and Space Sciences
- Galaxies; General; Individual; NGC 1316; SN 1980N; SN 1981D; SN 2006dd; SN 2006mr; Supernovae
- Institute of Physics Publishing
- Publisher URL
- Copyright © 2010. The American Astronomical Society. All rights reserved. The American Astronomical Society does not allow institutions to archive either the accepted manuscript or the published version of the article. However, you can find an earlier version of the full text here: http://arxiv.org/abs/1009.4390.
- Peer reviewed