Understand
Little red dots (LRDs), a population of active galactic nuclei (AGNs) recently identified by JWST, are characterized by their compact morphology and red optical continuum emission, which is often interpreted as evidence for significant dust extinction of $A_V \gtrsim 3$ mag.
- However, the dust-reddened AGN scenario is increasingly challenged by their faint near-to-far infrared emission and a potential "dust budget crisis" in cases when the host galaxy is either undetectably low-mass or absent.
- In this study, we re-evaluate the dust extinction level in LRDs by modeling the UV-to-infrared spectra for various extinction laws and a broad range of dusty distribution parameters.
- Comparing the predicted infrared fluxes with observational data from the JWST MIRI, Herschel, and ALMA, our analysis finds that the visual extinction is tightly and consistently constrained to $A_V \lesssim 1.0-1.5$ mag for A2744-45924, RUBIES-BLAGN-1, and stacked SEDs from a large sample of LRDs under the SMC extinction law, with slightly weaker constraints for those with gray extinction in the UV range.