The L1157 filament as traced in HNCO by the LMT
Abstract
Context. The L1157 outflow is a prototype of chemically active outflows where to look for molecular species linked to complex chemistry. Aims. With the aim of imaging the large (parsec) scale structure of key prebiotic molecules, we have mapped the whole blue-lobe of the L1157 outflow with the Large Millimeter Telescope (LMT), proving the potential of this facility to detect weak and extended molecular emission. Methods. Isocyanic acid, HNCO, an important precursor of complex chemistry, was chosen to be observed in its (4_0,4-3_0-3) transition at 87.925 GHz with the SEQUOIA focal-plane array, covering an area of 3x3 arcmin2 centered at the position of the main shock L1157-B1, which included a large portion of the vicinity of the protostellar region. Results. The HNCO emission was detected not only from the outflow but it also was found tracing a structure of about 0.3 pc in length, corresponding to the filament from which the protostellar system was born. Conclusions. The HNCO molecule was found to be a tracer of the densest part of filaments in molecular clouds, and given its importance in the formation of more complex molecules, its presence in the cold, quiescent filamentary gas indicates that the building blocks of complex chemistry are already well established in stages prior to protostellar warming or shocks. By allowing the detection of structures related with the filament, these observations proved the LMT potentialities to map weak and extended components in molecular clouds.
Versions
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BibTeX
@misc{gomezruiz2026l1157,
title = {{The L1157 filament as traced in HNCO by the LMT}},
author = {A. I. Gómez-Ruiz and C. Codella and O. S. Rojas-García and R. Bachiller and D. Sánchez-Arguelles and M. Chavez Dagostino and G. Narayanan and A. Batta and V. Gómez-Rivera and I. Rodríguez-Montoya and E. E. Martínez-García and R. Naranjo-Romero},
howpublished = {arXiv},
year = {2026},
month = nov,
doi = {10.48550/arxiv.2611.00336},
eprint = {2611.00336},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2611.00336},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - The L1157 filament as traced in HNCO by the LMT
AU - A. I. Gómez-Ruiz
AU - C. Codella
AU - O. S. Rojas-García
AU - R. Bachiller
AU - D. Sánchez-Arguelles
AU - M. Chavez Dagostino
AU - G. Narayanan
AU - A. Batta
AU - V. Gómez-Rivera
AU - I. Rodríguez-Montoya
AU - E. E. Martínez-García
AU - R. Naranjo-Romero
PY - 2026
DA - 2026/11/01
PB - arXiv
DO - 10.48550/arxiv.2611.00336
UR - https://arxiv.org/abs/2611.00336
AB - Context. The L1157 outflow is a prototype of chemically active outflows where to look for molecular species linked to complex chemistry. Aims. With the aim of imaging the large (parsec) scale structure of key prebiotic molecules, we have mapped the whole blue-lobe of the L1157 outflow with the Large Millimeter Telescope (LMT), proving the potential of this facility to detect weak and extended molecular emission. Methods. Isocyanic acid, HNCO, an important precursor of complex chemistry, was chosen to be observed in its (4_0,4-3_0-3) transition at 87.925 GHz with the SEQUOIA focal-plane array, covering an area of 3x3 arcmin2 centered at the position of the main shock L1157-B1, which included a large portion of the vicinity of the protostellar region. Results. The HNCO emission was detected not only from the outflow but it also was found tracing a structure of about 0.3 pc in length, corresponding to the filament from which the protostellar system was born. Conclusions. The HNCO molecule was found to be a tracer of the densest part of filaments in molecular clouds, and given its importance in the formation of more complex molecules, its presence in the cold, quiescent filamentary gas indicates that the building blocks of complex chemistry are already well established in stages prior to protostellar warming or shocks. By allowing the detection of structures related with the filament, these observations proved the LMT potentialities to map weak and extended components in molecular clouds.
ER -