On the observable signatures of a contracting protostellar fragment

Details On the observable signatures of a contracting protostellar fragment On the observable signatures of a contracting protostellar fragment

Dec 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...252..639a&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 252, no. 2, Dec. 1991, p. 639-644. Research supported by SEUI, Direccio Genera

Astronomy and Astrophysics

Astrophysics

Angular Resolution, Carbon Monoxide, Protostars, Spectral Signatures, Star Formation, Brightness Temperature, Interferometry, Signal To Noise Ratios, Spectral Emission

Scientific paper

The influence is examined of the angular resolution of an instrument on the emission signature of the CO line from a contracting envelope, and predicted emission maps are given. The asymmetric line-wing profile noted by Anglada et al. (1987) is described in terms of its power-law dependence, radial velocity, and strong blue wing. Current mm interferometric observations are considered since they can be only partially resolved and since the resolution can affect the observed line profile. The intensity of the blueshifted emission can be biased and sharply increasing toward the center of the map when the observations are made with angular resolutions of less than about 1 arcsec. The intensity of the redshifted emission, however, generally appears constant over the emitting region. Other characteristics of the contracting protostellar fragments are confirmed for CO interferometric observations of about 5 arcsec.

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