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Distance to the Active Galaxy NGC 6951 via the Type Ia Supernova 2000E

J. Vinko·B. Csak·Sz. Csizmadia·G. Furesz·L. L. Kiss·K. Sarneczky·Gy. Szabo·K. Sziladi·I. B. Biro
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Abstract

CCD-photometry and low-resolution spectroscopy of the bright supernova SN 2000E in NGC 6951 are presented. Both the light curve extending up to 150 days past maximum and the spectra obtained at 1 month past maximum confirm that SN 2000E is of Type Ia. The reddening of SN 2000E is determined as E(B-V)=0.36+/-0.15, its error is mainly due to uncertainties in the predicted SN (B-V) colour at late epochs. The V(RI)_C light curves are analyzed with the Multi-Colour Light Curve Shape (MLCS) method. The shape of the late light curve suggests that SN 2000E was overluminous by about 0.5 mag at maximum comparing with a fiducial SN Ia. This results in an updated distance of 33+/-8 Mpc of NGC 6951 (corrected for interstellar absorption). The SN-based distance modulus is larger by about +0.7 mag than the previous Tully-Fisher estimates. However, possible systematic errors due to ambiguities in the reddening determination and estimates of the maximum luminosity of SN 2000E may plague the present distance measurement.

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J. Vinko, B. Csak, Sz. Csizmadia, G. Furesz, L. L. Kiss, K. Sarneczky, Gy. Szabo, K. Sziladi, I. B. Biro. 2001-04-24. Distance to the Active Galaxy NGC 6951 via the Type Ia Supernova 2000E. https://doi.org/10.1051/0004-6361%3A20010573

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