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Linda J. Smith University College London

MODEST-6 Workshop 29-31 August 2005. with Mark Westmoquette (UCL) Jay Gallagher (Wisconsin-Madison) Bob O’Connell (Virginia) Richard de Grijs (Sheffield). HST/STIS SPECTROSCOPY OF A YOUNG SSC IN THE STARBURST CORE OF M82. Linda J. Smith University College London. WFPC2 BVI+H . A.

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Linda J. Smith University College London

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  1. MODEST-6 Workshop 29-31 August 2005 withMark Westmoquette (UCL)Jay Gallagher (Wisconsin-Madison)Bob O’Connell (Virginia)Richard de Grijs (Sheffield) HST/STIS SPECTROSCOPY OF A YOUNG SSC IN THE STARBURST CORE OF M82 Linda J. SmithUniversity College London

  2. WFPC2 BVI+H A STScI-PRC2001-08b R. de Grijs REGION A: 86 clusters!! In projection: Density of 1450 /kpc2 Mean separation = 11 +/- 5 pc Mean radius = 5 +/- 2 pc (Melo et al. 2005) STIS slit = 52”

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

  4. STIS G430L + G750M spectra of M82-A1 • Age = 6.4 +/- 0.4 Myr • E(B-V) = 1.35 +/- 0.15 mag • V = 17.23 +/- 0.1 mag • MV = -14.8 +/- 0.4 mag • Mass = 7-13 x 105 Msun • Half-light radius = 3.0 +/- 0.5 pc • Mass density = 6-11 x 103 Msun 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 107 cm-3 K

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