A peculiar supernova in the spiral galaxy NGC4618

Astronomy and Astrophysics – Astronomy

Scientific paper

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Astronomical Spectroscopy, Supernova Remnants, Supernovae, Emission Spectra, Oxygen, Quasars, Spiral Galaxies

Scientific paper

Optical spectra of a bright stellar object near the nucleus of the spiral galaxy NGC 4618 reveal strong, very broad emission lines similar to those in quasars but having the wrong relative wavelengths. Although lines of hydrogen and helium are absent, the most prominent features can be attributed to neutral atoms of oxygen, sodium, and magnesium at the redshift of NGC 4618. The object is almost certainly a supernova whose highly unusual spectrum may be indicative of a fundamentally new subclass.

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