Spitzer Survey of Virgo (SPITSOV) O. Ivy Wong 1 17th Virgo - - PowerPoint PPT Presentation

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Spitzer Survey of Virgo (SPITSOV) O. Ivy Wong 1 17th Virgo Mini-meeting @ Strasbourg Observatory (19 June 2010) Papers in progress I. SPITSOV atlas global properties of the IRAC & MIPS observations II.Dusty PAH outflows and upturns

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17th Virgo Mini-meeting @ Strasbourg Observatory (19 June 2010) 1

Spitzer Survey of Virgo (SPITSOV)

O. Ivy Wong

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Papers in progress

I. SPITSOV atlas
global properties of the IRAC & MIPS observations

II.Dusty PAH outflows and upturns

investigates the PAH outflows and upturns observed within the

SPITSOV survey

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THE SPITSOV SAMPLE

43 VIRGO GALAXIES

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GALAXIES WITH DISTINCTIVE SIGNATURES

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GALAXIES WITH TRUNCATED STAR FORMATION

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WHAT HAPPENED HERE ???

Bernd & Marion’s CO maps are v. relevant here

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MIPS DATA (I)

Spatial resolution: @ 24 µm ~ 6˝, @ 70 µm ~ 18˝, @ 160 µm ~ 38˝ E.g. A nice face-on galaxy, NGC 4548 : 24 µm contours @ 2%, 5%, 10%, 50% & 90% of peak intensity

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NGC 4548 -- CONTINUED ...

70 µm contours @ 5%, 10%, 50% & 90% of peak intensity

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NGC 4548 -- CONTINUED ...

160 µm contours @ 5%, 10%, 50% & 90% of peak intensity

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MIPS DATA (II)

Spatial resolution: @ 24 µm ~ 6˝, @ 70 µm ~ 18˝, @ 160 µm ~ 38˝ E.g. An edge-on galaxy, NGC 4522 : 24 µm contours @ 2%, 5%, 10%, 50% & 90% of peak intensity

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NGC 4522 -- CONTINUED ...

70 µm contours @ 5%, 10%, 50% & 90% of peak intensity

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NGC 4522 -- CONTINUED ...

160 µm contours @ 5%, 10%, 50% & 90% of peak intensity

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SOME IRAC RESULTS (I)

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SOME IRAC RESULTS (II)

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INCLINATION EFFECTS?

✗

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SOME MIPS RESULTS (I)

simple result: lower

SF ==> lower dust T

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SOME MIPS RESULTS (II)

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NORMALISED S24 & SPAH VS. FIR COLOUR

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24 μm SURFACE DENSITY VS COLOUR

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Anaemic galaxies have lower 24μm/3.6μm in the inner 30% relative to the

uter 70% due to a higher density of older stellar population in the middle

HI-rich galaxies have higher 24μm/3.6μm

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HI-RICH (HI DEF < -0.1)

❇ANAEMIC

NORMAL SF MESSY/IN A PAIR

★ TRUNCATED W ONGOING PRESSURE

TRUNCATED W/O ONGOING PRESSURE
TRUNCATED COMPACT

+ TRUNCATED ANAEMIC

24μm/3.6μm as a function of Concentration

also good to compare this to David’s sample

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Spitzer Dusty Outflows

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Aim: to present SPITSOV galaxies which show dusty upturns and nuclear dust

utflows

Right: Galaxies with PAH upturns away from the main disk

PAH outflows & upturns

16th Virgo Mini-meeting @ Yale Univ. (24 November 2009)

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Galaxies with nuclear PAH

utflows

Near-future work:

measure quantitatively the

significance of these outflows

investigate why PAH outflows

exist for these galaxies (.. especially NGC 4694)

16th Virgo Mini-meeting @ Yale Univ. (24 November 2009)

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Summary

Global IR colours of SPITSOV are similar to the IR colours of star- forming galaxies irrespective of environment or spatial distribution G with weaker 70 μm span a larger range of FIR colours -- smaller galaxies are more dependent on recent star formation history Mid- and far-infrared colours do not correlate with inclination Proxy for SSFR (S24/S3.6) shows some correlation to 70-160 μm colour (hotter global T --> more likely to be able to heat dust to T ≥ 100K) No strong correlations are found for PAHS because there are destroyed in strong radiation fields and are dependent on metallicity G with anaemic SF appear to have colder global dust T

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