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A census of dense cores in the Taurus L1495 cloud from the Herschel Gould Belt Survey
- Source :
- Monthly Notices of the Royal Astronomical Society, Monthly Notices of the Royal Astronomical Society, 2016, 459 (1), pp.342--356. ⟨10.1093/mnras/stw301⟩, Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P-Oxford Open Option A, 2016, 459 (1), pp.342--356. ⟨10.1093/mnras/stw301⟩
- Publication Year :
- 2016
-
Abstract
- We present a catalogue of dense cores in a $\sim 4^\circ\times2^\circ$ field of the Taurus star-forming region, inclusive of the L1495 cloud, derived from Herschel SPIRE and PACS observations in the 70 $\mu$m, 160 $\mu$m, 250 $\mu$m, 350 $\mu$m, and 500 $\mu$m continuum bands. Estimates of mean dust temperature and total mass are derived using modified blackbody fits to the spectral energy distributions. We detect 525 starless cores of which $\sim10$-20% are gravitationally bound and therefore presumably prestellar. Our census of unbound objects is $\sim85$% complete for $M>0.015\,M_\odot$ in low density regions ($A_V\stackrel{0.1\,M_\odot$ overall. The prestellar core mass function (CMF) is consistent with lognormal form, resembling the stellar system initial mass function, as has been reported previously. All of the inferred prestellar cores lie on filamentary structures whose column densities exceed the expected threshold for filamentary collapse, in agreement with previous reports. Unlike the prestellar CMF, the unbound starless CMF is not lognormal, but instead is consistent with a power-law form below $0.3\,M_\odot$ and shows no evidence for a low-mass turnover. It resembles previously reported mass distributions for CO clumps at low masses ($M\stackrel{<br />Comment: 17 pages, 12 figures. Accepted for publication in MNRAS
- Subjects :
- Initial mass function
FOS: Physical sciences
F500
Astrophysics
01 natural sciences
Volume density
Stars formation
submillimetre
L1495
0103 physical sciences
ISM individual objects
Black-body radiation
010303 astronomy & astrophysics
QC
Solar and Stellar Astrophysics (astro-ph.SR)
QB
Physics
[SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph]
local interstellar matter
010308 nuclear & particles physics
Turbulence
Luminosity function
Astronomy
Astronomy and Astrophysics
Astrophysics - Astrophysics of Galaxies
ISM clouds
Astrophysics - Solar and Stellar Astrophysics
13. Climate action
Space and Planetary Science
Mass function
Astrophysics of Galaxies (astro-ph.GA)
Log-normal distribution
[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Subjects
Details
- Language :
- English
- ISSN :
- 00358711 and 13652966
- Database :
- OpenAIRE
- Journal :
- Monthly Notices of the Royal Astronomical Society, Monthly Notices of the Royal Astronomical Society, 2016, 459 (1), pp.342--356. ⟨10.1093/mnras/stw301⟩, Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P-Oxford Open Option A, 2016, 459 (1), pp.342--356. ⟨10.1093/mnras/stw301⟩
- Accession number :
- edsair.doi.dedup.....2b4df591dcc10d020c51279ef5ed8d6a