The Discovery of a Molecular Complex in the Tidal Arms near NGC 3077

Дата и время публикации : 1999-04-30T15:06:46Z

Авторы публикации и институты :
Fabian Walter (Radioastronomisches Institut, Bonn, Germany)
Andreas Heithausen (Radioastronomisches Institut, Bonn, Germany)

Оригинал статьи :

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Коментарии к статье: 12 pages (including 3 figures), accepted for publication in the ApJ Letters
Первичная категория: astro-ph

Все категории : astro-ph

Краткий обзор статьи: We present the discovery of a giant molecular complex (r=350 pc, M_ vir=10^7 M_sun) in the tidal arms south-east of NGC 3077, a member of the M 81 triplet. The complex is clearly detected in the 12CO (J=1-0) transition at five independent positions. The position relative to NGC 3077, the systemic velocity (v_hel=14km/s) and the cloud averaged line width (15km/s) indicate that the object is not related to Galactic cirrus but is extragalactic. The tidal HI arm where the molecular complex is located has an total HI mass of M_HI=3×10^8 M_sun. This tidal material was presumably stripped off the outer parts of NGC 3077 during the closest encounter with M 81, about 3×10^8 years ago. After the complex detected along a torn-out spiral arm of M 81 by Brouillet et al., it is the second of its kind reported so far. Based on published optical observations, we have no evidence for on–going star formation in the newly detected molecular complex. Since the system has all the ingredients to form stars in the future, we speculate that it might eventually resemble the young dwarf galaxies in the M 81 group.

Category: Physics