------------------------------------------------------------------------ sgrb2_survey.tex MNRAS, accepted Date: Thu, 1 Mar 2007 15:04:07 -0000 Message-ID: X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: submit sgrb2_survey.tex MNRAS, accepted Thread-Index: AcdcEUAqB/O2VX6ISDaIGd5hxFUvrgAAFsmQAABBbnA= From: "Polehampton, ET \(Edward\)" To: X-OriginalArrivalTime: 01 Mar 2007 15:04:05.0444 (UTC) FILETIME=[DADD2040:01C75C12] X-MailScanner-Information: Please contact the postmaster@aoc.nrao.edu for more information X-MailScanner: Found to be clean X-MailScanner-SpamCheck: not spam, SpamAssassin (not cached, score=1.919, required 5, autolearn=disabled, DNS_FROM_RFC_ABUSE 0.48, DNS_FROM_RFC_POST 1.44) X-MailScanner-SpamScore: s X-MailScanner-From: e.t.polehampton@rl.ac.uk X-Spam-Status: No Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by dropbox.aoc.nrao.edu id l21F4RaB004069 %astro-ph/0702725 \documentclass[usenatbib,usegraphicx]{mn2e} \title{The ISO LWS high resolution spectral survey towards Sagittarius B2} \author{Edward~T.~Polehampton,$^{1,2}$ Jean-Paul~Baluteau,$^3$ Bruce~M.~Swinyard,$^1$ Javier~R.~Goicoechea,$^4$ John~M.~Brown,$^5$ Glenn~J.~White,$^{1,6}$ Jos\'{e}~Cernicharo,$^7$ Timothy~W.~Grundy,$^1$} \affil{$^1$Space Science \& Technology Department, Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire, OX11 0QX, UK\\ $^2$Department of Physics, University of Lethbridge, 4401 University Drive, Lethbridge, Alberta, T1J 1B1, Canada \\ $^3$Laboratoire d'Astrophysique de Marseille, CNRS \& Universit\'e de Provence, BP 8, F-13376 Marseille Cedex 12, France\\ $^4$LERMA, UMR 811, CNRS, Observatoire de Paris et \'{E}cole Normale Sup\'{e}rieure, 24 rue Lhomond, 75231 Paris Cedex 05, France\\ $^5$Physical and Theoretical Chemistry Laboratory, South Parks Road, Oxford, OX1 3QZ, UK\\ $^6$Department of Physics and Astronomy, Open University, Venables Building, Milton Keynes, MK6 7AA, UK\\ $^7$Departmento de Astrof\'{i}sica Molecular e Infrarroja, IEM, CSIC, Serrano 121, 28006, Madrid, Spain} \begin{document} \maketitle \begin{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-P\'{e}rot mode. This provided complete wavelength coverage in the range 47--196~$\mu$m (6.38--1.53~THz) with a spectral resolution of 30--40~km~s$^{-1}$. 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 (NH$_3$, NH$_2$, NH, H$_2$O, OH, H$_3$O$^+$, CH, CH$_2$, C$_3$, HF and H$_2$D$^+$). 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~$\mu$m and CII~158~$\mu$m 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. \end{abstract}