A Molecular Line Study of the Recently Discovered Class 0 Source Barnard 1-c
Bibliographic record
Abstract
We present a BIMA molecular line study of the class 0 source Barnard 1-c in the Perseus molecular cloud. As followup to the detection of an atypical polarization pattern in this young stellar object by Matthews & Wilson (2002), we have obtained high resolution data in CO, C¹⁸O, ¹³CO, HCO⁺, and N₂H⁺ from BIMA, plus N₂H⁺ data from FCRAO. N₂H⁺ is destroyed in the core centre and along the jet axis due to the high abundance of CO. The N₂H⁺ data demonstrate that this core is rotating (see Figure 1) with its rotation axis aligned with the observed molecular outflow. We have used high spectral resolution data of N₂H⁺ to measure the velocity and linewidths across the core. In addition, we present models of the SED (using BIMA, JCMT, IRAS and Spitzer data) generated with DUSTY in order to estimate the size scale of the evaporated region. We compare the morphology and kinematics of the B1-c core and jet to those of NGC 1333 IRAS 2 and IRAM 04191+1522, another very young class 0 source.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".