Blue Compact Dwarf Galaxies with Spitzer: The Infrared/Radio Properties

Abstract

We study the correlation between the radio, mid-infrared and far-infrared properties for a sample of 28 blue compact dwarf (BCD) and low metallicity star-forming galaxies observed by Spitzer. We find that these sources extend the same far-infrared to radio correlation typical of star forming late type alaxies to lower luminosities. In BCDs, the 24um (or 22um) mid-infrared to radio correlation is similar to starburst galaxies, though there is somewhat larger dispersion in their q_24 parameter compared to their q_FIR. No strong correlations between the q parameter and galaxy metallicity or effective dust temperature have been detected, though there is a hint of decreasing q_24 at low metallicities. The two lowest metallicity dwarfs in our sample, IZw18 and SBS0335-052E, despite their similar chemical abundance, deviate from the average q${}_{24}$ ratio in opposite manners, displaying an apparent radio excess and dust excess respectively.

8 pages, 4 figures, accepted by ApJ

References in corpus (6)

• Mid-Infrared Spectral Diagnostics of Nuclear and Extra-Nuclear Regions in Nearby Galaxies
• I Zw 18 revisited with HST/ACS and Cepheids: New Distance and Age
• The opaque nascent starburst in NGC 1377: Spitzer SINGS observations
• Extending the infrared radio correlation
• Dust Properties and Star-Formation Rates in Star-Forming Dwarf Galaxies
• Elemental Abundances of Blue Compact Dwarfs from mid-IR Spectroscopy with Spitzer

Cited by in corpus (9)

• LOFAR/H-ATLAS: The low-frequency radio luminosity - star-formation rate relation
• Spitzer Analysis of HII Region Complexes in the Magellanic Clouds: Determining a Suitable Monochromatic Obscured Star Formation Indicator
• Stars and gas in the most metal-poor galaxies I: COS and MUSE observations of SBS 0335-052E
• The far-infrared - radio correlation in dwarf galaxies
• The Mid-Infrared [SIV]/[NeII] versus [NeIII]/[NeII] Correlation
• Tests of star formation metrics in the low metallicity galaxy NGC 5253 using ALMA observations of H30$\alpha$ line emission
• The dependence of the IR-radio correlation on the metallicity
• A Complete 16 micron-Selected Galaxy Sample at $z\sim 1$: Mid-infrared Spectral Energy Distributions
• Characterizing the outer disk of eXtended-UV galaxies in the optical domain with deep surveys