منابع مشابه
Observations of Individual Giant Molecular Clouds in M 81
Received ; accepted – 2 – ABSTRACT We present 12 CO J=1-0 observations from the Caltech Millimeter Array of a field in the nearby spiral galaxy M81. We detect emission from three features that are the size of large giant molecular clouds (GMCs) in the Milky Way Galaxy and M31, but are larger than any known in M33 or the SMC. The M81 clouds have diameters ∼ 100 pc and molecular masses ∼ 3 × 10 5...
متن کاملFree–Floating HI Clouds in the M 81 Group
Recent VLA observations pointed at dwarf spheroidal (dSph) galaxies in the M81 group reveal a hitherto hidden population of extremely low mass ( ∼ 10 M⊙) HI clouds with no obvious optical counterparts. We have searched 10 fields in the M81 group totalling 2.2 square degree, both targeting known dwarf spheroidal galaxies and blank fields around the central triplet. Our observations show that the...
متن کاملOne - sided Jet in the Center of M 81
The nucleus of the nearby spiral galaxy M81 was observed at 8.3 GHz with a global VLBI array at 20 epochs over four and a half years, with a linear resolution at the source of about 2000 AU or 0.01 pc. Phase-referenced mapping with respect to the geometric center of supernova 1993J in the same galaxy enabled us to find, with a standard error of about 600 AU, a stationary point in the source sou...
متن کامل1 - 0 Observations of Individual Giant Molecular Clouds in M 81
We present CO J=1-0 observations from the Caltech Millimeter Array of a field in the nearby spiral galaxy M81. We detect emission from three features that are the size of large giant molecular clouds (GMCs) in the Milky Way Galaxy and M31, but are larger than any known in M33 or the SMC. The M81 clouds have diameters ∼ 100 pc and molecular masses ∼ 3 × 10 M . These are the first GMCs to be dete...
متن کاملIdentification of molecular complexes in M 81
We report about high spatial resolution observations made with the IRAM Plateau de Bure interferometer of the 12CO(J = 1 → 0) emission from a 1.1 × 1.1 kpc plane-of-sky field on a spiral arm of Messier 81. With a beam of 5′′ ≈ 90 pc, we identify 6 giant molecular cloud complexes with virial masses of ≈ 106 M , including one associated with a giant HII region. The deduced N (H2)/ICO ratios are a...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2007
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:20077883