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With Mark Westmoquette (UCL) Jay Gallagher (Wisconsin-Madison) Bob O’Connell (Virginia) Richard de Grijs (Sheffield) Linda J. Smith University College.

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Presentation on theme: "With Mark Westmoquette (UCL) Jay Gallagher (Wisconsin-Madison) Bob O’Connell (Virginia) Richard de Grijs (Sheffield) Linda J. Smith University College."— Presentation transcript:

1 with Mark Westmoquette (UCL) Jay Gallagher (Wisconsin-Madison) Bob O’Connell (Virginia) Richard de Grijs (Sheffield) Linda J. Smith University College London MODEST-6 Workshop August 2005 HST/STIS SPECTROSCOPY OF A YOUNG SSC IN THE STARBURST CORE OF M82

2 WFPC2 BVI+H  STScI-PRC b R. de Grijs STIS slit = 52” REGION A: 86 clusters!! In projection: Density of 1450 /kpc 2 Mean separation = 11 +/- 5 pc Mean radius = 5 +/- 2 pc (Melo et al. 2005) A

3 180 pc STIS slit position 52” x 0.1” 0”.1 = 1.8 pc M82-A1 WFPC2 V-band image

4 STIS G430L + G750M spectra of M82-A1 Age = 6.4 +/- 0.4 Myr E(B-V) = / mag V = /- 0.1 mag M V = /- 0.4 mag Mass = 7-13 x 10 5 M sun Half-light radius = 3.0 +/- 0.5 pc Mass density = 6-11 x 10 3 M sun pc -3

5 [NII]+H  [SII] Distance along slit -> Small HII region around M82-A1 Half-light radius = 4.5 +/- 0.5 pc Electron density = 1800 cm -3 Pressure P/k = 2 x 10 7 cm -3 K

6


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