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| Paper: |
Extended Infrared Emission from (U)LIRGs |
| Volume: |
446, Galaxy Evolution: Infrared to Millimeter Wavelength Perspective |
| Page: |
49 |
| Authors: |
Charmandaris, V. |
| Abstract: |
I discuss recent findings on the presence the extended emission of a
volume limited (d < 82 Mpc) sample of luminous infrared
galaxies(LIRGs) drawn from the Great Observatories All-sky LIRG
Survey (GOALS) galaxy sample. Using Spitzer/IRS spectra to determine
the fraction of emission arising from their extended component, we
find the majority of LIRGs, at least ∼20% (and up to
∼80%) of their emission stems from an extended component. The
IRS spectra also allow us to separate the different emission
components (dust continuum and PAH feature emission, ionized and
molecular gas) and calculate their corresponding spatial extent. We
find that in several galaxies the PAH feature emission is more
extended (up to 3 times) than that of the mid-infrared continuum.
These results suggest that mid-infrared emission of LIRGs is not as
compact as in their more luminous counterparts (ULIRGs) but instead
it is distributed across their disks. Ongoing analysis of the
extent of the different components will also enable us to ascertain
whether the high redshift, higher luminosity submillimeter galaxies
(SMGs), which also display fairly extended star formation, can be
considered the scaled-up luminosity examples of local LIRGs, rather
than ULIRGs. |
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