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Oxygen in the protostellar clump OMC-2 FIR4
Jorma Harju, Paola Caselli, Rolf Güsten +6
Atomic oxygen (OI), OH, H2O, and CO are the main carriers of oxygen in dense interstellar gas and important coolants of shocks associated with protostellar outflows. We determine t…
Statistical nuclear spin ratios of deuterated ammonia in the pre-stellar core L1544
Jorma Harju, Paola Caselli, Olli Sipilae +6
We determined the ortho/para (o/p) ratios of NH2D and NHD2 in the archetypical pre-stellar core L1544. The core was observed in the two lowest rotational lines of ortho- and para-N…
Nuclear spin ratios of deuterated ammonia in prestellar cores. LAsMA observations of H-MM1 and Oph D
Jorma Harju, Jaime E. Pineda, Olli Sipilä +6
We determine the ortho/para ratios of NH2D and NHD2 in two dense, starless cores, where their formation is supposed to be dominated by gas-phase reactions, which, in turn, is predi…
Initial conditions of star formation at 2000 au: physical structure and NH depletion of three early-stage cores
Yuxin Lin, Silvia Spezzano, Jaime E. Pineda +5
Pre-stellar cores represent a critical evolutionary phase in low-mass star formation. We aim to unveil the detailed thermal structure and density distribution of three early-stage…
An Interferometric View of H-MM1. I. Direct Observation of NH3 Depletion
Jaime E. Pineda, Jorma Harju, Paola Caselli +14
Spectral lines of ammonia, NH, are useful probes of the physical conditions in dense molecular cloud cores. In addition to advantages in spectroscopy, ammonia has also been sug…
Methanol Mapping in Cold Cores: Testing Model Predictions
Anna Punanova, Anton Vasyunin, Paola Caselli +5
Chemical models predict that in cold cores gas-phase methanol is expected to be abundant at the outer edge of the CO depletion zone, where CO is actively adsorbed. CO adsorption co…