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Studies of the M81 Group: Tidal Star Formation and Spitzer

Studies of the M81 Group: Tidal Star Formation and Spitzer. John Feldmeier CWRU/NOAO. Collaborators : Robin Ciardullo (PSU), Pat Durrell (YSU), Megan De Cesar (PSU), George Jacoby (WIYN), Denise Hurley-Keller(CWRU), Chris Mihos (CWRU). Galaxies are Fat. Size of a Star = 7 x 10^8 m

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Studies of the M81 Group: Tidal Star Formation and Spitzer

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  1. Studies of the M81 Group: Tidal Star Formation and Spitzer John Feldmeier CWRU/NOAO Collaborators: Robin Ciardullo (PSU), Pat Durrell (YSU), Megan De Cesar (PSU), George Jacoby (WIYN), Denise Hurley-Keller(CWRU), Chris Mihos (CWRU)

  2. Galaxies are Fat • Size of a Star = 7 x 10^8 m • Distance between Stars = 3 x 10^16 m Ratio = 4 x 10^7 – Unlikely • Size of a large Galaxy = 9 x 10^20 m • Distance Between Galaxies = 3 x 10^22 m Ratio = 33 – 1,000,000 times more common!

  3. Movie Time!

  4. So, galaxy collisions can be common. What are their effects on galaxies and their environment? • Programs for galaxy crashes are available at http://burro.astr.cwru.edu/JavaLab/index.html

  5. The M81 Group D = 3.1 Mpc Interaction is believed to have occurred 220 – 290 Myr ago Yun, Ho, & Lo (1994)

  6. IPN observations from KPNO 4-m (PI: Feldmeier) IRG observations from CFHT (PI: Durrell)

  7. 1 +/- 0.4 RGB stars per sq arcmin - < 2% Loose Limit (4 PN): <5.3% Strict Limit (1 PN): <1.3%

  8. Blue objects are all sources with (V-I) colors bluer than 0.4 (at most 10% contamination). Objects are 34 and 37 kpc away from M81 (Durrell et al. 2004)

  9. Evidence for extra-tidal star formation in the M81 group – well after the collision

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