Spitzer Local Volume Legacy (LVL) SEDs and Physical Properties

David O. Cook; Daniel A. Dale; Benjamin D. Johnson; Liese Van Zee; Janice C. Lee; Robert C. Kennicutt; Daniela Calzetti; Shawn M. Staudaher; Charles W. Engelbracht

doi:10.1093/mnras/stu1787

paper

Spitzer Local Volume Legacy (LVL) SEDs and Physical Properties

arXiv:1409.0847 · doi:10.1093/mnras/stu1787

Abstract

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 (1500 $A ˚$ to 24 $μ$ m) 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 color-color relationships and correlated trends between observed and physical properties (i.e., optical magnitudes and dust properties, optical color and specific star formation rate, and ultraviolet-infrared color 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 sSFR at a value of log( $s S F R$ ) $\sim$ $-$ 10.2.

Accepted for publication in MNRAS (15 pages, 14 figures, 1 table)

Spitzer Local Volume Legacy (LVL) SEDs and Physical Properties

Abstract

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