The LOFAR Two-metre Sky Survey: The nature of the faint source population and SFR-radio luminosity relation using Prospector
Monthly Notices of the Royal Astronomical Society(2024)
摘要
Spectral energy distribution (SED) fitting has been extensively used to
determine the nature of the faint radio source population. Recent efforts have
combined fits from multiple SED-fitting codes to account for the host galaxy
and any active nucleus that may be present. We show that it is possible to
produce similar-quality classifications using a single energy-balance SED
fitting code, Prospector, to model up to 26 bands of UV-far-infrared
aperture-matched photometry for ∼31,000 sources in the ELAIS-N1 field from
the LOFAR Two-Metre Sky Survey (LoTSS) Deep fields first data release. One of a
new generation of SED-fitting codes, Prospector accounts for potential
contributions from radiative active galactic nuclei (AGN) when estimating
galaxy properties, including star formation rates (SFRs) derived using
non-parametric star formation histories. Combining this information with radio
luminosities, we classify 92 per cent of the radio sources as a star-forming
galaxy, high/low-excitation radio galaxy, or radio-quiet AGN and study the
population demographics as a function of 150 MHz flux density, luminosity, SFR,
stellar mass, redshift and apparent r-band magnitude. Finally, we use
Prospector SED fits to investigate the SFR-150 MHz luminosity relation for a
sample of ∼133,000 3.6 μm-selected z<1 sources, finding that the
stellar mass dependence is significantly weaker than previously reported, and
may disappear altogether at log_10 (SFR/M_⊙ yr^-1)
> 0.5. This approach makes it significantly easier to classify radio sources
from LoTSS and elsewhere, and may have important implications for future
studies of star-forming galaxies at radio wavelengths.
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