Discovery of a Second Companion of Dwingeloo 1

Details Discovery of a Second Companion of Dwingeloo 1 Discovery of a Second Companion of Dwingeloo 1

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aj....113..981m&link_type=abstract

Astronomical Journal v.113, p.981

Astronomy and Astrophysics

Astronomy

6

Scientific paper

Deep near-infrared CCD imaging of the field of the recently discovered nearby galaxies Dwingeloo 1 and 2 has revealed a third, previously unknown galaxy which is most likely a second physical companion of Dwingeloo 1. Only 9'.2 to the southwest of Dwingeloo 1 is a diffuse featureless oval with a diameter of 1'.9 in I. Isophotes are oriented nearly east-west and within 30° of the direction of Dwingeloo 1. Neutral hydrogen studies have failed to reveal a source at this position, and no Hα emission is evident. Thus, the object is probably a dwarf spheroidal companion of Dwingeloo 1, although there is a small possibility that it is a quiescent gas-rich dwarf with a velocity low enough that its signal is confused with emission from the Milky Way. The galaxy is almost certainly a member of the IC 342-Maffei 1 group, thereby placing it 3±1 Mpc away. Hα

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