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Title:
A census of dense cores in the Taurus L1495 cloud from the Herschel
Authors:
Marsh, K. A.; Kirk, J. M.; André, Ph.; Griffin, M. J.; Könyves, V.; Palmeirim, P.; Men'shchikov, A.; Ward-Thompson, D.; Benedettini, M.; Bresnahan, D. W.; di Francesco, J.; Elia, D.; Motte, F.; Peretto, N.; Pezzuto, S.; Roy, A.; Sadavoy, S.; Schneider, N.; Spinoglio, L.; White, G. J.
Affiliation:
AA(School of Physics and Astronomy, Cardiff University, Cardiff CF24 3AA, UK; ), AB(Jeremiah Horrocks Institute for Astrophysics and Supercomputing, University of Central Lancashire, Preston PR1 2HE, UK), AC(Laboratoire AIM, CEA/DSM-CNRS-Université Paris Diderot, IRFU / Service d'Astrophysique, C.E. Saclay, Orme des Merisiers, F-91191 Gif-sur-Yvette, France), AD(School of Physics and Astronomy, Cardiff University, Cardiff CF24 3AA, UK), AE(Laboratoire AIM, CEA/DSM-CNRS-Université Paris Diderot, IRFU / Service d'Astrophysique, C.E. Saclay, Orme des Merisiers, F-91191 Gif-sur-Yvette, France), AF(Laboratoire AIM, CEA/DSM-CNRS-Université Paris Diderot, IRFU / Service d'Astrophysique, C.E. Saclay, Orme des Merisiers, F-91191 Gif-sur-Yvette, France; Laboratoire d'Astrophysique de Marseille, CNRS/INSU-Université de Provence, F-13388 Marseille cedex 13, France), AG(Laboratoire AIM, CEA/DSM-CNRS-Université Paris Diderot, IRFU / Service d'Astrophysique, C.E. Saclay, Orme des Merisiers, F-91191 Gif-sur-Yvette, France), AH(Jeremiah Horrocks Institute for Astrophysics and Supercomputing, University of Central Lancashire, Preston PR1 2HE, UK), AI(Istituto di Astrofisica e Planetologia Spaziali - INAF, Via Fosso del Cavaliere 100, I-00133 Roma Italy), AJ(Jeremiah Horrocks Institute for Astrophysics and Supercomputing, University of Central Lancashire, Preston PR1 2HE, UK), AK(National Research Council of Canada, Hertzberg Institute of Astrophysics, 5071 West Saanich Rd., Victoria, BC, V9E 2E7, Canada), AL(Istituto di Astrofisica e Planetologia Spaziali - INAF, Via Fosso del Cavaliere 100, I-00133 Roma Italy), AM(Laboratoire AIM, CEA/DSM-CNRS-Université Paris Diderot, IRFU / Service d'Astrophysique, C.E. Saclay, Orme des Merisiers, F-91191 Gif-sur-Yvette, France), AN(School of Physics and Astronomy, Cardiff University, Cardiff CF24 3AA, UK), AO(Istituto di Astrofisica e Planetologia Spaziali - INAF, Via Fosso del Cavaliere 100, I-00133 Roma Italy), AP(Laboratoire AIM, CEA/DSM-CNRS-Université Paris Diderot, IRFU / Service d'Astrophysique, C.E. Saclay, Orme des Merisiers, F-91191 Gif-sur-Yvette, France), AQ(Max-Planck-Institut für Astronomie (MPIA), Königstuhl 17, D-69117 Heidelberg, Germany), AR(Université Bordeaux, LAB, UMR 5804, F-33270 Floirac, France; CNRS, LAB, UMR 5804, F-33270 Floirac, France), AS(Istituto di Astrofisica e Planetologia Spaziali - INAF, Via Fosso del Cavaliere 100, I-00133 Roma Italy), AT(Department of Physics and Astronomy, The Open University, Milton Keynes MK7 6AA, UK; Space Science and Technology Department, CCLRC Rutherford Appleton Laboratory, Oxfordshire OX11 0QX, UK)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 459, Issue 1, p.342-356 (MNRAS Homepage)
Publication Date:
06/2016
Origin:
OUP
Astronomy Keywords:
stars: formation, stars: luminosity function, mass function, ISM: clouds, ISM: individual objects: L1495, local interstellar matter, submillimetre: ISM
Abstract Copyright:
2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society
DOI:
10.1093/mnras/stw301
Bibliographic Code:
2016MNRAS.459..342M

Abstract

We present a catalogue of dense cores in a ˜4° × 2° field of the Taurus star-forming region, inclusive of the L1495 cloud, derived from Herschel SPIRE and PACS observations in the 70 mum, 160 mum, 250 mum, 350 mum, and 500 mum 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 ˜10-20 per cent are gravitationally bound and therefore presumably prestellar. Our census of unbound objects is ˜85 per cent complete for M > 0.015 M&sun; in low-density regions (AV ≲ 5 mag), while the bound (prestellar) subset is ˜85 per cent complete for M > 0.1 M&sun; 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&sun; and shows no evidence for a low-mass turnover. It resembles previously reported mass distributions for CO clumps at low masses (M ≲ 0.3 M&sun;). The volume density PDF, however, is accurately lognormal except at high densities. It is consistent with the effects of self-gravity on magnetized supersonic turbulence. The only significant deviation from lognormality is a high-density tail which can be attributed unambiguously to prestellar cores.

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