Molecular Hydrogen as Baryonic Dark Matter | Zendy

A. Heithausen | Zendy

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Molecular Hydrogen as Baryonic Dark Matter

Author(s) -

A. Heithausen

Publication year - 2004

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/421111

Subject(s) - fractal , physics , angular resolution (graph drawing) , astrophysics , dark matter , resolution (logic) , hydrogen , interferometry , order (exchange) , optics , mathematical analysis , mathematics , combinatorics , quantum mechanics , artificial intelligence , computer science , finance , economics

High-angular resolution CO observations of small-area molecular structures(SAMS) are presented. The feature-less structures seen in the single-dishmeasurements break up into several smaller clumps in the interferometer map. Atan adopted distance of 100pc their sizes are of order a few hundred AU, some ofwhich are still unresolved at an angular resolution of about 3". The clumpshave a fractal structure with a fractal index between 1.7 and 2.0. Theirkinetic temperature is between 7K and 18K. Adopting standard conversion factorsmasses are about 1/10 Jupiter-masses for individual clumps and densities arehigher than 20000cm^{-3}. The clumps are highly overpressured and it is unknownwhat creates or maintains such structures.Comment: 8 pages, 1 figure, accepted by Astrophysical Journal Letter

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