Far-infrared/submillimetre properties of pre-stellar cores L1521E, L1521F and L1689B as revealed by the Herschel SPIRE instrument - I. Central positions

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dc.contributor.authorMakiwa, G.
dc.contributor.authorNaylor, David A.
dc.contributor.authorvan der Wiel, M. H. D.
dc.contributor.authorWard-Thompson, D.
dc.contributor.authorKirk, J. M.
dc.contributor.authorEyres, S.
dc.contributor.authorAbergel, A.
dc.contributor.authorKöhler, M.
dc.date.accessioned2019-12-13T04:42:31Z
dc.date.available2019-12-13T04:42:31Z
dc.date.issued2016
dc.descriptionSherpa Romeo green journal. Permission to archive final published versionen_US
dc.description.abstractDust grains play a key role in the physics of star-forming regions, even though they constitute only ∼1 per cent of the mass of the interstellar medium. The derivation of accurate dust parameters such as temperature (Td), emissivity spectral index (β) and column density requires broad-band continuum observations at far-infrared wavelengths. We present Herschel-Spectral and Photometric Imaging Receiver Array (SPIRE) Fourier Transform Spectrometer (FTS) measurements of three starless cores: L1521E, L1521F and L1689B, covering wavelengths between 194 and 671 µm. This paper is the first to use our recently updated SPIRE-FTS intensity calibration, yielding a direct match with SPIRE photometer measurements of extended sources. In addition, we carefully assess the validity of calibration schemes depending on-source extent and on the strength of background emission. The broad-band far-infrared spectra for all three sources peak near 250 µm. Our observations therefore provide much tighter constraints on the spectral energy distribution (SED) shape than measurements that do not probe the SED peak. The spectra are fitted using modified blackbody functions, allowing both Td and β to vary as free parameters.This yields Td of9.8±0.2,15.6±0.5and10.9±0.2K and corresponding β of 2.6∓0.9, 0.8∓0.1 and 2.4∓0.8 for L1521E, L1521F and L1689B, respectively.Thederivedcoremassesare1.0±0.1,0.10±0.01and0.49±0.05M ,respectively. The core mass/Jeans mass ratios for L1521E and L1689B exceed unity indicating that they are unstable to gravitational collapse, and thus pre-stellar cores. By comparison, the elevated temperature and gravitational stability of L1521F support previous arguments that this source is more evolved and likely a protostar.en_US
dc.description.peer-reviewYesen_US
dc.identifier.citationMakiwa, G., Naylor, D. A., van der Wiel, M. H. D., Ward-Thompson, D., Kirk, J. M., Eyres, S., ... Köhler, M. (2016). Far-infrared/submillimetre properties of pre-stellar cores L1521E, L1521F and L1689B as revealed by the Herschel SPIRE instrument - I. Central positions. Monthly Notices of the Royal Astronomical Society, 458)2), 2150-2160. doi:10.1093/mnras/stw428en_US
dc.identifier.urihttps://hdl.handle.net/10133/5630
dc.language.isoen_USen_US
dc.publisherOxford University Pressen_US
dc.publisher.departmentDepartment of Physics and Astronomyen_US
dc.publisher.facultyArts and Scienceen_US
dc.publisher.institutionUniversity of Lethbridgeen_US
dc.publisher.institutionUniversity of Copenhagenen_US
dc.publisher.institutionUniversity of Central Lancashireen_US
dc.publisher.institutionUniversité Paris Suden_US
dc.publisher.institutionCNRSen_US
dc.publisher.institutionQueen Mary University of Londonen_US
dc.publisher.urlhttps://doi.org/10.1093/mnras/stw428en_US
dc.subjectStar formationen_US
dc.subjectStar dusten_US
dc.subjectStar extinctionen_US
dc.subjectInfrared ISMen_US
dc.subjectSubmillimetre ISMen_US
dc.subjectStellar formation
dc.subjectSPIRE
dc.subjectHerschel
dc.subjectFar-infrared
dc.subject.lcshCircumstellar matter
dc.subject.lcshStars--Formation
dc.subject.lcshSpectrum analysis
dc.titleFar-infrared/submillimetre properties of pre-stellar cores L1521E, L1521F and L1689B as revealed by the Herschel SPIRE instrument - I. Central positionsen_US
dc.typeArticleen_US
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