Emission nebulae in NGC 4449

Astronomy and Astrophysics – Astronomy

Scientific paper

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Galactic Structure, Nebulae, Astronomical Coordinates, Astronomical Maps, H Ii Regions, Supernova Remnants, Tables (Data)

Scientific paper

Two hundred and fifty-two H II regions have been identified in NGC 4449 and positions in rectangular coordinates are given. The size-frequency relation is compared with that of M33, NGC 2403, NGC 628, NGC 3631, and NGC 6822. Very sharp and faint filaments radially arranged with respect to the main body of the galaxy have been identified. The characteristics of the discrete radio source recently detected by Seaquist and Bignell (1978) are discussed.

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