OVRO Millimeter Array Observations of the Circumstellar Disk of HH 30

Details OVRO Millimeter Array Observations of the Circumstellar Disk of HH 30 OVRO Millimeter Array Observations of the Circumstellar Disk of HH 30

Oct 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999alma.confe..61s&link_type=abstract

Science with the Atacama Large Millimeter Array (ALMA), Associated Universities, Inc., held October 6-8, 1999 at Carnegie Instit

Computer Science

Millimeter, Observation, Interferometer, Young Stellar Object, Accretion Disk, Taurus L1551, Hh 30

Scientific paper

We present the first millimeter interferometer observations of HH 30, an edge-on young stellar object accretion disk system located in the Taurus L1551 molecular cloud. Maps were made in the 12CO(2-1), 13CO(2-1), and 13CO(1-0) lines, and in the adjacent continuum. The dust continuum fluxes are weak, and imply a relatively small circumstellar disk mass (__10-3 MSun) consistent with estimates from Hubble Space Telescope images. Detailed comparison of the line maps and the HST images shows that the 12CO(2-1) traces both the disk and the optical jet; since the outflow lies nearly in the plane of the sky, it is difficult to disentangle the two components. However, the 13CO(2-1) emission appears confined to the disk plane and shows a velocity gradient indicative of orbital motion. The gas disk has a diameter comparable to that of the dust absorption lane seen in the optical images. Future ALMA observations with the spatial resolution of HST will provide huge gains in our understand of HH 30, one of the faintest YSO disks mapped to date at millimeter wavelengths.

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