The HIFI spectral survey of AFGL 2591 (CHESS). II. Summary of the survey

• Main Authors: Kazmierczak-Barthel, M, van der Tak, F. F. S, Helmich, F. P, Chavarria, L, Wang, K. -S, Ceccarelli, C
• Format: Journal Article
• Language: English
• Published: 19-05-2014
• Subjects: Physics - Astrophysics of Galaxies
• DOI: 10.48550/arxiv.1405.4761

A&A 567, A53 (2014) This paper presents the richness of submillimeter spectral features in the
high-mass star forming region AFGL 2591. As part of the CHESS (Chemical
Herschel Survey of Star Forming Regions) Key Programme, AFGL 2591 was observed
by the Herschel/HIFI instrument. The spectral survey covered a frequency range
from 480 up to 1240 GHz as well as single lines from 1267 to 1901 GHz (i.e. CO,
HCl, NH3, OH and [CII]). Rotational and population diagram methods were used to
calculate column densities, excitation temperatures and the emission extents of
the observed molecules associated with AFGL 2591. The analysis was supplemented
with several lines from ground-based JCMT spectra. From the HIFI spectral
survey analysis a total of 32 species were identified (including
isotopologues). In spite of the fact that lines are mostly quite week, 268
emission and 16 absorption lines were found (excluding blends). Molecular
column densities range from 6e11 to 1e19 cm-2 and excitation temperatures range
from 19 to 175 K. One can distinguish cold (e.g. HCN, H2S, NH3 with
temperatures below 70 K) and warm species (e.g. CH3OH, SO2) in the protostellar
envelope.