A survey of deuterated ammonia in the Cepheus star-forming region L1251

Galloway-Sprietsma, Maria; Shirley, Yancy L.; Di Francesco, James; Keown, Jared; Scibelli, Samantha; Sipilä, Olli; Smullen, Rachel

doi:10.1093/mnras/stac2084

Title: A survey of deuterated ammonia in the Cepheus star-forming region L1251

Journal Article · 27 July 2022 · Monthly Notices of the Royal Astronomical Society

DOI: https://doi.org/10.1093/mnras/stac2084 · OSTI ID:1882231

; Shirley, Yancy L.; Di Francesco, James; Keown, Jared;

;

ABSTRACT Understanding the chemical processes during starless core and prestellar core evolution is an important step in understanding the initial stages of star and disc formation. This project is a study of deuterated ammonia, o-NH2D, in the L1251 star-forming region towards Cepheus. Twenty-two dense cores (20 of which are starless or prestellar, and two of which have a protostar), previously identified by p-NH3 (1,1) observations, were targeted with the 12m Arizona Radio Observatory telescope on Kitt Peak. o-NH2D J$$_{\rm {K_a} \rm {K_c}}^{\pm } =$$$$1_{11}^{+} \rightarrow 1_{01}^{-}$$ was detected in 13 (59 per cent) of the NH3-detected cores with a median sensitivity of $$\sigma _{T_{mb}} = 17$$ mK. All cores detected in o-NH2D at this sensitivity have p-NH3 column densities >1014 cm−2. The o-NH2D column densities were calculated using the constant excitation temperature (CTEX) approximation while correcting for the filling fraction of the NH3 source size. The median deuterium fraction was found to be 0.11 (including 3σ upper limits). However, there are no strong, discernible trends in plots of deuterium fraction with any physical or evolutionary variables. If the cores in L1251 have similar initial chemical conditions, then this result is evidence of the cores physically evolving at different rates.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: Event Horizon Telescope Experiment; Max Planck Society; National Aeronautics and Space Administration (NASA); National Science Foundation (NSF); USDOE National Nuclear Security Administration (NNSA); USDOE National Nuclear Security Administration (NNSA), Office of Defense Programs (DP)

Grant/Contract Number:: 89233218CNA000001

OSTI ID:: 1882231

Report Number(s):: LA-UR-21-31400

Journal Information:: Monthly Notices of the Royal Astronomical Society, Journal Name: Monthly Notices of the Royal Astronomical Society Journal Issue: 4 Vol. 515; ISSN 0035-8711

Publisher:: Oxford University PressCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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