Very cold cores in the Taurus Molecular Ring as seen by ISO
| Autor: | Toshikazu Onishi, M. Haas, Kalevi Mattila, L. V. Tóth, Dietrich Lemke |
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| Rok vydání: | 2004 |
| Předmět: |
Physics
Cyanopolyyne 010308 nuclear & particles physics Star formation Molecular cloud Extinction (astronomy) Astronomy and Astrophysics Astrophysics Kinetic energy 01 natural sciences chemistry.chemical_compound chemistry 13. Climate action Space and Planetary Science 0103 physical sciences Surface brightness Low Mass 010303 astronomy & astrophysics Line (formation) |
| Zdroj: | Astronomy & Astrophysics. 420:533-546 |
| ISSN: | 1432-0746 0004-6361 |
| Popis: | Three prominent cold objects of the Taurus Molecular Ring (TMR) were revealed by our ISOPHOT 200 µ mm ap of the south-eastern part of the Heiles Cloud 2 (HCL 2) cloud complex. One corresponds to the cyanopolyyne peak region of the TMC-1 ridge, (TMC-1 CP), one is the HCL2-E cloud, and one which we call HCL2-ES lies south of TMC-1. The 200/100 µm colour temperatures and column densities of the three ISOPHOT cold clouds are ≈12 K, and 1.2 ± 0.7 × 10 22 cm −2 respectively, as calculated from ISO/IRAS surface brightnesses. As Nagoya-4 m C 18 O (1-0) spectra show, these are dense molecular clouds with N(H) > 10 21 cm −2 column density peaks. The ISOPHOT 200 µm surface brightness is well correlated with the C 18 O line intensity (corr. coef . ≈ 70%). The large dust particle emissivity is found to be increased in the prototypical very dense core TMC-1 CP. As the low linewidths (∆v = 0.8 ± 0. 2k m s −1 ) indicate, the level of turbulent energy density is 50% lower in these three clouds than in other clouds of HCL2. Dense cores were identified inside the C 18 O clouds by NH3 measurements with the Effelsberg-100 m telescope and Nobeyama-45 m H 13 CO + data. The density of the dense cores is n ≥ 1.1 × 10 5 cm −3 ,a nd their kinetic temperatures are |
| Databáze: | OpenAIRE |
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