Astronomy and Astrophysics, volume 440, 151-161 (2005/9-2)
Star formation in Perseus. Clusters, filaments and the conditions for star formation.
HATCHELL J., RICHER J.S., FULLER G.A., QUALTROUGH C.J., LADD E.F. and CHANDLER C.J.
Abstract (from CDS):
We present a complete survey of current star formation in the Perseus molecular cloud, made at 850 and 450µm with SCUBA at the JCMT. Covering 3 deg2
, this submillimetre continuum survey for protostellar activity is second in size only to that of ρ Ophiuchus (Johnstone et al., 2004ApJ...611L..45J
). Complete above 0.4M☉
(5σ detection in a 14'' beam), we detect a total of 91 protostars and prestellar cores. Of these, 80% lie in clusters, representative of star formation across the Galaxy. Two of the groups of cores are associated with the young stellar clusters IC348 and NGC 1333, and are consistent with a steady or reduced star formation rate in the last 0.5Myr, but not an increasing one. In Perseus, 40-60% of cores are in small clusters (<50M☉
) and isolated objects, much more than the 10% suggested from infrared studies. Complementing the dust continuum, we present a C18
O map of the whole cloud at 1' resolution. The gas and dust show filamentary structure of the dense gas on large and small scales, with the high column density filaments breaking up into clusters of cores. The filament mass per unit length is 5-11M☉
per 0.1pc. Given these filament masses, there is no requirement for substantial large scale flows along or onto the filaments in order to gather sufficient material for star formation. We find that the probability of finding a submillimetre core is a strongly increasing function of column density, as measured by C18
O integrated intensity, P(core)∝I3.0
. This power law relation holds down to low column density, suggesting that there is no Av
threshold for star formation in Perseus, unless all the low-Av
submm cores can be demonstrated to be older protostars which have begun to lose their natal molecular cloud.
stars: formation - submillimeter - dust, extinction - ISM: molecules - ISM: clouds - ISM: structure
VizieR on-line data:
<Available at CDS (J/A+A/440/151): tablea1.dat refs.dat>
Table A1: [HRF2005] NN (Nos 1-91).
Paragraph 5.1 IRAS 03422+3256 is a probable misprint for IRAS 03422+3156.
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