The ISO LWS high resolution spectral survey towards Sagittarius B2

Abstract

A full spectral survey was carried out towards the Giant Molecular Cloud complex, Sagittarius B2 (Sgr B2), using the ISO Long Wavelength Spectrometer Fabry-Perot mode. This provided complete wavelength coverage in the range 47-196 um (6.38-1.53 THz) with a spectral resolution of 30-40 km/s. This is an unique dataset covering wavelengths inaccessible from the ground. It is an extremely important region of the spectrum as it contains both the peak of the thermal emission from dust, and crucial spectral lines of key atomic (OI, CII, OIII, NII and NIII) and molecular species (NH3, NH2, NH, H2O, OH, H3O+, CH, CH2, C3, HF and H2D+). In total, 95 spectral lines have been identified and 11 features with absorption depth greater than 3 sigma remain unassigned. Most of the molecular lines are seen in absorption against the strong continuum, whereas the atomic and ionic lines appear in emission (except for absorption in the OI 63 um and CII 158 um lines). Sgr B2 is located close to the Galactic Centre and so many of the features also show a broad absorption profile due to material located along the line of sight. A full description of the survey dataset is given with an overview of each detected species and final line lists for both assigned and unassigned features.

Accepted for publication in MNRAS

References in corpus (5)

• APEX mapping of H3O+ in the Sgr B2 region
• Diagnostics for specific PAHs in the far-IR: searching neutral naphthalene and anthracene in the Red Rectangle
• A far-infrared molecular and atomic line survey of the Orion KL region
• The detection of the (J,K)=(18,18) line of NH3
• Far-Infrared detection of H2D+ toward Sgr B2

Cited by in corpus (10)

• Herschel observations of EXtraordinary Sources: Analysis of the full Herschel/HIFI molecular line survey of Sagittarius B2(N)
• Nitrogen hydrides in interstellar gas II. Analysis of Herschel/HIFI observations towards W49N and G10.6-0.4 (W31C)
• A proto-pseudobulge in ESO 320-G030 fed by a massive molecular inflow driven by a nuclear bar
• First detection of the carbon chain molecules 13CCC and C13CC towards SgrB2(M)
• Mid- and far-infrared fine-structure line sensitivities to hypothetical variability of the fine-structure constant
• Sulfur-bearing species in molecular clouds
• Herschel observations of extraordinary sources: Full Herschel/HIFI molecular line survey of Sagittarius B2(M)
• Physical parameters for Orion KL from modelling its ISO high resolution far-IR CO line spectrum
• Hunting for the elusive methylene radical
• Dissociative recombination measurements of NH${}^{+}$ using an ion storage ring