Schuller, F., Csengeri, T., Urquhart, J. S., Duarte-Cabral, A., Barnes, P. J., Giannetti, A., Hernandez, A. K., Leurini, S., Mattern, M., Medina, S. -N. X., Agurto, C., Azagra, F., Anderson, L. D., Beltran, M. T., Beuther, H., Bontemps, S., Bronfman, L., Dobbs, C. L., Dumke, M., Finger, R., Ginsburg, A., Gonzalez, E., Henning, T., Kauffmann, J., Mac-Auliffe, F., Menten, K. M., Montenegro-Montes, F. M., Moore, T. J. T., Muller, E., Parra, R., Perez-Beaupuits, J. -P., Pettitt, A., Russeil, D., Sanchez-Monge, A., Schilke, P., Schisano, E., Suri, S., Testi, L., Torstensson, K., Venegas, P., Wang, K., Wienen, M., Wyrowski, F. and Zavagno, A. (2017). SEDIGISM: Structure, excitation, and dynamics of the inner Galactic interstellar medium. Astron. Astrophys., 601. LES ULIS CEDEX A: EDP SCIENCES S A. ISSN 1432-0746

Full text not available from this repository.

Abstract

Context. The origin and life-cycle of molecular clouds are still poorly constrained, despite their importance for understanding the evolution of the interstellar medium. Many large-scale surveys of the Galactic plane have been conducted recently, allowing for rapid progress in this field. Nevertheless, a sub-arcminute resolution global view of the large-scale distribution of molecular gas, from the diffuse medium to dense clouds and clumps, and of their relationship to the spiral structure, is still missing. Aims. We have carried out a systematic, homogeneous, spectroscopic survey of the inner Galactic plane, in order to complement the many continuum Galactic surveys available with crucial distance and gas-kinematic information. Our aim is to combine this data set with recent infrared to sub-millimetre surveys at similar angular resolutions. Methods. The SEDIGISM survey covers 78 deg(2) of the inner Galaxy (-60 degrees <= l <= 18 degrees, vertical bar b vertical bar <= 0.5 degrees) in the J = 2-1 rotational transition of (CO)-C-13. This isotopologue of CO is less abundant than (CO)-C-12 by factors up to 100. Therefore, its emission has low to moderate optical depths, and higher critical density, making it an ideal tracer of the cold, dense interstellar medium. The data have been observed with the SHFI single-pixel instrument at APEX. The observational setup covers the (CO)-C-13(2-1) and (CO)-O-18(2-1) lines, plus several transitions from other molecules. Results. The observations have been completed. Data reduction is in progress, and the final data products will be made available in the near future. Here we give a detailed description of the survey and the dedicated data reduction pipeline. To illustrate the scientific potential of this survey, preliminary results based on a science demonstration field covering -20 degrees <= l <= -18.5 degrees are presented. Analysis of the (CO)-C-13(2-1) data in this field reveals compact clumps, diffuse clouds, and filamentary structures at a range of heliocentric distances. By combining our data with data in the (1-0) transition of CO isotopologues from the ThrUMMS survey, we are able to compute a 3D realization of the excitation temperature and optical depth in the interstellar medium. Ultimately, this survey will provide a detailed, global view of the inner Galactic interstellar medium at an unprecedented angular resolution of similar to 30 ''.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Schuller, F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Csengeri, T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Urquhart, J. S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Duarte-Cabral, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Barnes, P. J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Giannetti, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hernandez, A. K.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Leurini, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Mattern, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Medina, S. -N. X.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Agurto, C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Azagra, F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Anderson, L. D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Beltran, M. T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Beuther, H.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bontemps, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bronfman, L.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Dobbs, C. L.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Dumke, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Finger, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ginsburg, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gonzalez, E.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Henning, T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kauffmann, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Mac-Auliffe, F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Menten, K. M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Montenegro-Montes, F. M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Moore, T. J. T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Muller, E.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Parra, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Perez-Beaupuits, J. -P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Pettitt, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Russeil, D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Sanchez-Monge, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Schilke, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Schisano, E.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Suri, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Testi, L.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Torstensson, K.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Venegas, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wang, K.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wienen, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wyrowski, F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Zavagno, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-231994
DOI: 10.1051/0004-6361/201628933
Journal or Publication Title: Astron. Astrophys.
Volume: 601
Date: 2017
Publisher: EDP SCIENCES S A
Place of Publication: LES ULIS CEDEX A
ISSN: 1432-0746
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
INFRARED DARK CLOUD; GIANT MOLECULAR CLOUDS; MASSIVE STAR-FORMATION; KINEMATIC DISTANCE AMBIGUITY; PRINCIPAL COMPONENT ANALYSIS; RECONSTRUCTING CO MAPS; SOUTHERN MILKY-WAY; SPECTRAL-LINE DATA; H II REGIONS; PLANE SURVEYMultiple languages
Astronomy & AstrophysicsMultiple languages
Refereed: Yes
URI: http://kups.ub.uni-koeln.de/id/eprint/23199

Downloads

Downloads per month over past year

Altmetric

Export

Actions (login required)

View Item View Item