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.

arXiv commentAccepted for publication in MNRAS

References in corpus (22)

• Discovery of Interstellar Hydrogen Fluoride
• The far-IR spectrum of Sagittarius B2 region: Extended molecular absorption, photodissociation and photoionization
• The far-infrared spectrum of Arp 220
• APEX mapping of H3O+ in the Sgr B2 region
• Far-Infrared OH fluorescent emission in Sagittarius B2
• Observations of rotationally resolved C3 in translucent sight lines
• A Spectral Line Survey of Selected 3 mm Bands Toward Sagittarius B2(N-LMH) Using the NRAO 12 Meter Radio Telescope and the BIMA Array I. The Observational Data
• Diagnostics for specific PAHs in the far-IR: searching neutral naphthalene and anthracene in the Red Rectangle
• Water Vapor around Sgr B2
• SWAS and Arecibo observations of H2O and OH in a diffuse cloud along the line-of-sight to W51
• A far-infrared molecular and atomic line survey of the Orion KL region
• Far-Infrared detection of methylene
• ISO-LWS observations of C+ and O lines in absorption toward SgrB2
• Water Absorption From Line-of-Sight Clouds Toward W49A
• The detection of the (J,K)=(18,18) line of NH3
• Detection of HD in emission towards Sagittarius B2
• The line-of-sight distribution of water in the SgrB2 complex
• Oxygen isotopic ratios in galactic clouds along the line of sight towards Sagittarius B2
• Submillimeter Wave Astronomy Satellite mapping observations of water vapor around Sagittarius B2
• ISO observations of the Galactic center Interstellar Medium: ionized gas
• Far-infrared detection of 17OH towards Sagittarius B2
• Far-Infrared detection of H2D+ toward Sgr B2

Cited by in corpus (25)

• Herschel/PACS spectroscopy of NGC 4418 and Arp 220: H2O, H2^{18}O, OH, ^{18}OH, O I, HCN and NH3
• The chemistry of vibrationally excited H2 in the interstellar medium
• Excited OH+, H2O+, and H3O+ in NGC 4418 and Arp 220
• Herschel observations of EXtraordinary Sources: Analysis of the full Herschel/HIFI molecular line survey of Sagittarius B2(N)
• First interstellar detection of OH+
• Detection of interstellar oxidaniumyl: abundant H2O+ towards the star-forming regions DR21, Sgr B2, and NGC6334
• Nitrogen hydrides in interstellar gas: Herschel/HIFI observations towards G10.6-0.4 (W31C)
• Nitrogen hydrides in interstellar gas II. Analysis of Herschel/HIFI observations towards W49N and G10.6-0.4 (W31C)
• Herschel observations of the Sgr B2 cores: Hydrides, warm CO, and cold dust
• Herschel observations of extra-ordinary sources: Detecting spiral arm clouds by CH absorption lines
• Dissociative recombination measurements of HCl+ using an ion storage ring
• Ground-state ammonia and water in absorption towards Sgr B2
• A proto-pseudobulge in ESO 320-G030 fed by a massive molecular inflow driven by a nuclear bar
• Ortho-to-para ratio of NH2. Herschel-HIFI observations of ortho- and para-NH2 rotational transitions towards W31C, W49N, W51 and G34.3+0.1
• 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
• Herschel observations of extraordinary sources: Full Herschel/HIFI molecular line survey of Sagittarius B2(M)
• Sulfur-bearing species in molecular clouds
• The ISO Long Wavelength Spectrometer line spectrum of VY Canis Majoris and other oxygen-rich evolved stars
• Herschel observations of deuterated water towards Sgr 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
• Chemical and radiative transfer modeling of the ISO-LWS Fabry-Perot spectra of Orion-KL water lines
• The far-IR view of Sgr B2 and Orion KL