SNe 1999dd and 1999de are AGN

Details SNe 1999dd and 1999de are AGN SNe 1999dd and 1999de are AGN

Aug 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005atel..586....1g&link_type=abstract

The Astronomer's Telegram, #586

Astronomy and Astrophysics

Astronomy

3

Optical, Agn, Novae, Supernovae

Scientific paper

I have obtained a spectrum of the host galaxy of SN 1999dd (Gal- Yam & Maoz 1999; IAUC #7227) with the LRIS spectrograph mounted on the Keck I 10m telescope at WMKO, Hawaii, on UT August 1, 2005. Full reduction reveals the galaxy is a type I AGN at z=1.064, derived from broad Mg II 2800 and confirmed by narrow OII 3727. I therefore conclude the optical variability originally attributed to a SN is more likely to have been an AGN flare, and that SN 1999dd is likely not a SN at all.

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