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Time dependent chemistry in Planck clouds?

Published online by Cambridge University Press:  27 October 2016

Peter Berczik ,
Peter Bertsyk ,
Orsolya Fehér ,
Jorma Harju ,
Toshykazu Onishi  and
László Viktor Tóth
Peter Berczik
Affiliation:
National Astronomical Observatories of China, Chinese Academy of Sciences, Beijing, China. National Academy of Sciences of Ukraine, Main Astronomical Observatory, Kyiv, Ukraine.
Peter Bertsyk
Affiliation:
Department of Astronomy, Lorand Eotvos University, Budapest, Hungary. Department of Physical Chemistry, Lorand Eotvos University, Budapest, Hungary
Orsolya Fehér
Affiliation:
Department of Astronomy, Lorand Eotvos University, Budapest, Hungary.
Jorma Harju
Affiliation:
Department of Physics, University of Helsinki.
Toshykazu Onishi
Affiliation:
Dept. of Physical Science, Osaka Prefecture University, Osaka, Japan.
László Viktor Tóth
Affiliation:
Department of Astronomy, Lorand Eotvos University, Budapest, Hungary.
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Abstract

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We present a set of time dependent chemical evolution models (based on the UMIST† astrochemistry 2012 code, McElroy et al. (2013) for a range of initial physical cloud parameters: 10 K < T < 20 K; 103 cm−3 < n(H2) < 5 ⋅ 104 cm−3; 1 < AV < 10 and with estimated values of scaled interstellar ultraviolet radiation field. We compare our chemical model results with the relative abundances of: CO, CH, OH, HCO+, HCN, HNC, NH3, N2H+ and H2CO molecules. We find significant time dependent variations of the chemical ratios of: X(NH3/H2); X(HCO+/H2) and X(HCO+/NH3). The input physical conditions were taken from Fehér O. et al. (2015) at 16 positions along the TMC-1 dark cloud. The NH3 and HCO+ relative densities based on the observations of Fehér O. et al. (2015) help to find the “chemical age” of the given position in the evolution curves.

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References

Fehér, O., Ward-Thompson, D., Tóth, L. V., Kirk, J., Pelkonen, V. M., Zahorecz, S. & Pintér, S. 2015, A&A, submittedGoogle Scholar
McElroy, D., Walsh, C., Markwick, A. J., Cordiner, M. A., Smith, K., & Millar, T. J. 2013, A&A, 550, A36 Google Scholar