The position-velocity diagrams of protostellar discs

Details The position-velocity diagrams of protostellar discs The position-velocity diagrams of protostellar discs

Aug 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.251..707r&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 251, Aug. 15, 1991, p. 707-718.

Computer Science

Performance

9

Accretion Disks, Protostars, Star Formation, Stellar Evolution, Gravitational Collapse, Interstellar Gas, Molecular Clouds, Position, Velocity

Scientific paper

The paper discusses the expected appearance of centrifugally supported astrophysical disks observed in optically thin line emission, with particular emphasis on the molecular line emission arising from protostellar disks. If spectra are taken along the (known) long axis of the projected disk, which is assumed to be unresolved perpendicular to this direction, then the resulting two-dimensional data set I(x, v), (the position-velocity, or l-v, diagram) describes the emission. Using a simple kinematic description of line formation in a rotating disk, theoretical l-v diagrams are presented, and these are with l-v diagrams recently reported in the literature which are claimed to represent rotating protostellar disks; the differences between the observed and predicted l-v diagrams are discussed. Methods of deriving the properties of disks (emissivity and mass as a function of radius) from the observed l-v diagrams are suggested; the emissivity distribution constrains the temperature structure in the disk, while the mass distribution (and hence also total disk mass) is a vital parameter in models of star formation. The performance of these inversion methods is investigated as a function of the signal-to-noise ratio and the beam-size of the observations.

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