Other
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21922007b&link_type=abstract
American Astronomical Society, AAS Meeting #219, #220.07
Other
Scientific paper
We present high spatial (<300 AU) and spectral (0.07 km s-1) resolution Submillimeter Array observations of the dense starless cluster core Oph A N6, in the 1 mm dust continuum and the 3-2 lines of N2H+ and N2D+. The dust continuum observations reveal a compact source not seen in single-dish observations, of size 1000 AU and mass 0.005-0.01 Msun. The line observations, combined with single-dish observations, reveal a core of size 3000 x 1400 AU elongated in a NW-SE direction, with almost no variation in either line width or line center velocity across the map, and very small non-thermal motions. The deuterium fraction has a peak value of 0.15 and is >0.05 over much of the core. The N2H+ column density profile across the major axis of Oph A-N6 is well represented by an isothermal cylinder, with temperature 20 K, peak density 7.0 x 106 cm-3, and N2H+ abundance 2.7 x 10-10. The mass of Oph A-N6 is estimated to be 0.35 Msun, compared to a value of 0.18 Msun from the isothermal cylinder analysis, and 0.65 Msun for the critical mass for fragmentation of an isothermal cylinder. Compared to isolated low-mass cores, Oph A-N6 shows similar narrow line widths and small velocity variation, with a deuterium fraction similar to "evolved” dense cores. It is significantly smaller than isolated cores, with larger peak column and volume density. The available evidence suggests that Oph A-N6 has formed through the fragmentation of the Oph A filament and is the precursor to a low-mass star. The dust continuum emission suggests that it may already have begun to form a star.
Belloche Arnaud
Bourke Tyler L.
Caselli Paola
di Francesco James
Myers Philip
No associations
LandOfFree
Initial Conditions For Star Formation In Clusters: Physical And Kinematical Structure Of The Starless Core Opha-n6 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Initial Conditions For Star Formation In Clusters: Physical And Kinematical Structure Of The Starless Core Opha-n6, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Initial Conditions For Star Formation In Clusters: Physical And Kinematical Structure Of The Starless Core Opha-n6 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1577862