1 / 13

Age-dating a Starburst: Gemini/CIRPASS Observations of the Core of M83

Explore the age-dating and observations of compact star-forming regions in M83's core using CIRPASS and HST/WFPC2 data. Discover triggers for star formation, critical gas density, and age gradients indicative of sequential triggering. Ideal for NIR MOS analysis.

cbruno
Download Presentation

Age-dating a Starburst: Gemini/CIRPASS Observations of the Core of M83

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Age-dating a Starburst:Gemini/CIRPASS Observationsof the Core of M83 Stuart Ryder & Robert Sharp AAO Johan Knapen U. Hertfordshire Lisa Mazzuca GSFC Ian Parry U. Cambridge

  2. Circumnuclear Star Formation • Compact SF regions (“knots”) in ring/spiral < 1 kpc across. • CSF most common in barred spirals. • Bars “funnel” gas inwards, accumulates near Inner Lindblad Resonance (ILR): W = Wp - k/2 • What triggers CSF? • Critical gas density • Spiral density wave  Random age spread  Age gradient

  3. HST/WFPC2 F300W F547M F814W AAT/IRIS2 50 pc Dyn/Phot Center M83 (NGC 5236)

  4. young Harris et al. 2001, AJ, 122, 3046 Model: Starburst99 Z=0.04, a=2.35 Instantaneous Burst AV=1 old The HST View

  5. Starburst Clock No. 1 • H recombination line (Ha, Pab, Brg) equivalent widths. • Leitherer et al. “Starburst 99” models: Instantaneous Burst Continuous SF

  6. Starburst Clock No. 2 • CO band (2.29 mm, 1.62 mm) spectroscopic index. • Leitherer et al. “Starburst 99” models: Instantaneous Burst Continuous SF

  7. The CIRPASS View

  8. The CIRPASS View

  9. Knot-by-knot analysis

  10. Region Analysis

  11. Pab 1.28 mm [Fe II] 1.64mm Inside-out, or Outside-in?

  12. Sequential Triggering in M100

  13. Summary • Photometry gives an incomplete/ambiguous age picture. • NIR IFU spectroscopy less biased by extinction and selection effects. • Multiple spectral line diagnostics help constrain Star Formation History. • Clear azimuthal age gradients in M83 and M100 provide best evidence yet for sequential triggering via spiral density wave-induced shock. • Ideal project for NIR MOS: GNIRS IFU will have 3.3"  4.8" FOV at 0.15" sampling, R=1700, full K window includes Brg and CO (2,0) bands. “The cube is not enough”

More Related