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Star formation in the nuclear region of M83: The HST/NICMOS view
Stockholm University, Faculty of Science, Department of Astronomy.
Stockholm University, Faculty of Science, Department of Astronomy.
2004 (English)In: The Interplay among Black Holes, Stars and ISM in Galactic Nuclei: Proceedings of the 222th Symposium of the International Astronomical Union / [ed] T. Storchi-Bergmann, L. C. Ho & H. R. Schmitt, Cambridge: Cambridge University Press , 2004, 219-220 p.Conference paper, Published paper (Refereed)
Abstract [en]

The nuclear region of the barred spiral galaxy M83 has been imaged at near-infrared wavelengths with the HST NICMOS, showing a new region of star formation activity.

Place, publisher, year, edition, pages
Cambridge: Cambridge University Press , 2004. 219-220 p.
Series
Proceedings of the International Astronomical Union, ISSN 1743-9213 ; 222
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:su:diva-23100DOI: 10.1017/S1743921304002133ISBN: 0-521-84803-2 (print)OAI: oai:DiVA.org:su-23100DiVA: diva2:190141
Conference
International Astronomical Union, Symposium, March 1-5, 2004, Gramado, Rio Grande do Sul, Brazil
Available from: 2004-05-06 Created: 2004-05-06 Last updated: 2011-07-01Bibliographically approved
In thesis
1. Molecular gas in the galaxy M83: Its distribution, kinematics, and relation to star formation
Open this publication in new window or tab >>Molecular gas in the galaxy M83: Its distribution, kinematics, and relation to star formation
2004 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The barred spiral galaxy M83 (NGC5236) has been observed in the 12CO J=1–0 and J=2–1 millimetre lines with the Swedish-ESO Submillimetre Telescope (SEST). The sizes of the CO maps are 100×100, and they cover the entire optical disk. The CO emission is strongly peaked toward the nucleus. The molecular spiral arms are clearly resolved and can be traced for about 360º. The total molecular gas mass is comparable to the total Hi mass, but H2 dominates in the optical disk.

Iso-velocity maps show the signature of an inclined, rotating disk, but also the effects of streaming motions along the spiral arms. The dynamical mass is determined and compared to the gas mass. The pattern speed is determined from the residual velocity pattern, and the locations of various resonances are discussed. The molecular gas velocity dispersion is determined, and a trend of decreasing dispersion with increasing galactocentric radius is found.

A total gas (H2+Hi+He) mass surface density map is presented, and compared to the critical density for star formation of an isothermal gaseous disk. The star formation rate (SFR) in the disk is estimated using data from various star formation tracers. The different SFR estimates agree well when corrections for extinctions, based on the total gas mass map, are made. The radial SFR distribution shows features that can be associated with kinematic resonances. We also find an increased star formation efficiency in the spiral arms. Different Schmidt laws are fitted to the data. The star formation properties of the nuclear region, based on high angular resolution HST data, are also discussed.

Place, publisher, year, edition, pages
Stockholm: Institutionen för astronomi, 2004. 42 p.
Keyword
Molecular gas, Galaxies, Galaxies individual: M83, Star formation, Galactic dynamics
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
urn:nbn:se:su:diva-148 (URN)91-7265-864-9 (ISBN)
Public defence
2004-05-28, Sal FB52, AlbaNova universitetscentrum, Roslagstullsbacken 21, Stockholm, 13:00
Opponent
Supervisors
Available from: 2004-05-06 Created: 2004-05-06Bibliographically approved

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