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2014MNRAS.445..899C - Mon. Not. R. Astron. Soc., 445, 899-912 (2014/November-3)

Spitzer Local Volume Legacy (LVL) SEDs and physical properties.

COOK D.O., DALE D.A., JOHNSON B.D., VAN ZEE L., LEE J.C., KENNICUTT R.C., CALZETTI D., STAUDAHER S.M. and ENGELBRACHT C.W.

Abstract (from CDS):

We present the panchromatic spectral energy distributions (SEDs) of the Local Volume Legacy (LVL) survey which consists of 258 nearby galaxies (D < 11 Mpc). The wavelength coverage spans the ultraviolet to the infrared (1500Å-24 µm) which is utilized to derive global physical properties (i.e. star formation rate, stellar mass, internal extinction due to dust). With these data, we find colour-colour relationships and correlated trends between observed and physical properties (i.e. optical magnitudes and dust properties, optical colour and specific star formation rate, and ultraviolet-infrared colour and metallicity). The SEDs are binned by different galaxy properties to reveal how each property affects the observed shape of these SEDs. In addition, due to the volume-limited nature of LVL, we utilize the dwarf-dominated galaxy sample to test star formation relationships established with higher mass galaxy samples. We find good agreement with the star-forming main-sequence' relationship, but find a systematic deviation in the infrared main sequence' at low luminosities. This deviation is attributed to suppressed polycyclic aromatic hydrocarbon (PAH) formation in low-metallicity environments and/or the destruction of PAHs in more intense radiation fields occurring near a suggested threshold in star formation rates (sSFR) at a value of log(sSFR) ∼ -10.2.

Abstract Copyright: © 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2014)

Journal keyword(s): dust, extinction - galaxies: dwarf - galaxies: ISM - Local Group - galaxies: spiral - galaxies: star formation

VizieR on-line data: <Available at CDS (J/MNRAS/445/899): table1.dat>