Sign on

SAO/NASA ADS Astronomy Abstract Service

· Find Similar Abstracts (with default settings below)
· Full Refereed Journal Article (PDF/Postscript)
· Full Refereed Scanned Article (GIF)
· References in the article
· Citations to the Article (125) (Citation History)
· Refereed Citations to the Article
· SIMBAD Objects (4)
· Also-Read Articles (Reads History)
· Translate This Page
Protostellar accretion disks resolved with the JCMT-CSO interferometer
Lay, O. P.; Carlstrom, J. E.; Hills, R. E.; Phillips, T. G.
AA(Mullard Radio Astronomy Observatory, Cambridge, UK), AB(Mullard Radio Astronomy Observatory, Cambridge, UK), AC(Mullard Radio Astronomy Observatory, Cambridge, UK), AD(Mullard Radio Astronomy Observatory, Cambridge, UK)
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 434, no. 2, p. L75-L78 (ApJL Homepage)
Publication Date:
NASA/STI Keywords:
Accretion Disks, Astronomical Interferometry, Protostars, Star Formation, Submillimeter Waves, Brightness Distribution, Brightness Temperature, Brown Dwarf Stars, Infrared Astronomy, Stellar Models
Bibliographic Code:


The James Clark Maxwell Telescope-Caltech Submillimeter Observatory (JCMT-CSO) submillimeter interferometer was used to measure the size and orientation of the compact dust continuum emission at 870 micrometers from the protostellar sources HL Tau and L1551 IRS 5. Assuming an elliptical Gaussian for the brightness distribution and distances of 140 pc, the data are well fitted by semi-major radii to half-maximum brightness and position angles of 60 AU at 126 deg for HL Tau and 80 AU at 162 deg for L1551. An upper limit of 50 AU (0.4 sec) is set for the radii along the minor axes, leading to minimum brightness temperatures of 36 K and 28 K, respectively. The elongation in the continuum emission is perpendicular to the outflow axes, as expected for accretion disks. The high brightness indicates substantial column density and mass, further strengthening the accretion disk interpretation. Our observations do not strongly constrain the disk mass; applying an accretion disk model to our data gives a lower limit of approximately 0.02 solar mass for both sources.

Printing Options

Print whole paper
Print Page(s) through

Return 600 dpi PDF to Acrobat/Browser. Different resolutions (200 or 600 dpi), formats (Postscript, PDF, etc), page sizes (US Letter, European A4, etc), and compression (gzip,compress,none) can be set through the Printing Preferences

More Article Retrieval Options

HELP for Article Retrieval

Bibtex entry for this abstract   Preferred format for this abstract (see Preferences)


Find Similar Abstracts:

Use: Authors
Keywords (in text query field)
Abstract Text
Return: Query Results Return    items starting with number
Query Form
Database: Astronomy
arXiv e-prints