Physics
Scientific paper
Jan 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005esasp.577..211g&link_type=abstract
In: Proceedings of the dusty and molecular universe: a prelude to Herschel and ALMA, 27-29 October 2004, Paris, France. Ed. by A
Physics
Infrared: Ism: Lines And Bands, Ism: Molecules, Line: Identification, Galaxies: Ism
Scientific paper
The far-IR covers the spectral signature of several interesting phenomena that are difficult to observe from ground-based telescopes. The Infrared Space Observatory (ISO) has shown that the far-IR domain contributes to a better understanding of the physics and chemistry of the interstellar medium (ISM). In this contribution, we discuss the role of the far-IR spectrum of light hydrides such as OH as a diagnostic of the physical conditions prevailing in galactic and extragalactic sources such as Sgr B2, Orion, NGC 253, or NGC 1068. In addition, far-IR spectroscopy can also contribute to the detection of symmetrical molecules (without rotational spectrum) such as the pure carbon chains. We discuss our efforts to detect C3, C4, C5, and C6 in the interstellar and circumstellar media. Nevertheless, the sensitivity and the spatial/spectral resolution of ISO's spectrometers was rather poor. HIFI and PACS instruments, on board HERSCHEL, will allow more detailed studies on the molecular content and physical conditions of many IR sources and will help to answer many of the topics that remain open after the end of the ISO mission.
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