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M 82: starburst Rosetta Stone

Published online by Cambridge University Press:  26 May 2016

Natascha M. Förster Schreiber ,
Reinhard Genzel ,
Dieter Lutz  and
Amiel Sternberg
Natascha M. Förster Schreiber
Affiliation:
Sterrewacht Leiden, Postbus 9513, NL-2300 RA Leiden, Nederland
Reinhard Genzel
Affiliation:
Max-Planck-Institut für extraterrestrische Physik, Postfach 1312, D-85741 Garching-bei-München, BRD
Dieter Lutz
Affiliation:
Max-Planck-Institut für extraterrestrische Physik, Postfach 1312, D-85741 Garching-bei-München, BRD
Amiel Sternberg
Affiliation:
School of Physics and Astronomy, Tel Aviv University, Ramat Aviv, Tel Aviv 69978, Israel

Abstract

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We present evolutionary synthesis modeling of the nuclear regions of the starburst galaxy M 82, based on near-infrared integral field spectroscopy and mid-infrared ISO spectroscopy. Our data indicate the occurrence of two distinct starburst episodes in the central 500 pc about 8 – 15 Myr and 5 Myr ago, each lasting a few million years only. The first burst was most intense within 50 pc of the nucleus while the second burst took place in a circumnuclear ring of radius ~ 85 pc and along the stellar bar at larger radii. These recent episodes succeeded earlier starburst activity ~ 1 kpc away from the nucleus and peaking 650 Myr ago, as traced by the luminous star clusters studied by de Grijs et al. (2001). The combined results of both studies reveal complex evolution of starburst activity in M 82 which is consistent with a tidally-induced bar-driven scenario.

Type
Part 3. Location and Distribution of Massive Stars
Information
Symposium - International Astronomical Union , Volume 212: A Massive Star Odyssey: From Main Sequence to Supernova , 2003 , pp. 523 - 530
Copyright
Copyright © Astronomical Society of the Pacific 2003 

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