A New Calibration of Star Formation Rate in Galaxies Based on Polycyclic Aromatic Hydrocarbon Emission

TL;DR

This paper introduces a new calibration method linking PAH emission to star formation rates in galaxies, utilizing spectral decomposition of Spitzer data across diverse galaxy types to improve SFR estimates.

Contribution

It presents a novel relation between PAH luminosity and star formation rate based on mid-infrared spectral analysis, applicable across a wide range of galaxy masses and SFRs.

Findings

PAH emission correlates with star formation rate in most galaxies.

PAH emission is suppressed in low-mass, dwarf galaxies.

New calibrations for PAH features as SFR indicators are provided.

Abstract

Polycyclic aromatic hydrocarbon (PAH) emission has long been proposed to be a potential star formation rate indicator, as it arises from the photodissociation region bordering the Str\"omgren sphere of young, massive stars. We apply a recently developed technique of mid-infrared spectral decomposition to obtain a uniform set of PAH measurements from Spitzer low-resolution spectra of a large sample of star-forming galaxies spanning a wide range in stellar mass ($M_\star \approx 10^6-10^{11.4}\,M_{\odot}$) and star formation rate ($\sim 0.1- 2000\,M_{\odot}\rm\,yr^{-1}$). High-resolution spectra are also analyzed to measure [Ne II] 12.8 $\mu$m and [Ne III] 15.6 $\mu$m, which effectively trace the Lyman continuum. We present a new relation between PAH luminosity and star formation rate based on the [Ne II] and [Ne III] lines. Calibrations are given for the integrated $5-15$ $\mu$m PAH emission, the individual features at 6.2, 7.7, 8.6, and 11.3 $\mu$m, as well as several mid-infrared bandpasses sensitive to PAH. We confirm that PAH emission is suppressed in low-mass, dwarf galaxies, and we discuss the possible physical origin of this effect.