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This research aims to link optical attenuation with dust and gas distributions in nearby galaxies.

February 5, 2026

Relating spatially resolved optical attenuation, dust, and gas in nearby galaxies

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This research aims to link optical attenuation with dust and gas distributions in nearby galaxies.
Investigated five nearby star-forming spiral galaxies
Utilized far-ultraviolet to sub-millimetre observations
Mapped dust mass surface density using the CIGALE SED-fitting code
Independently estimated optical attenuation using the Balmer decrement
Analyzed gas surface density maps alongside integral-field spectroscopic data
Both dust mass surface density and optical attenuation are better indicators of molecular gas mass than atomic gas.
High molecular fractions correlate with decreasing atomic gas densities across the studied galaxies.
Attenuation measurements for young stars align well with both optical and spectral methods, enhancing their applicability.
Estimated AV, BD ratios are slightly higher than prior findings, indicating potential deviations in dust behavior.

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Connects optical attenuation to dust distribution and gas density in nearby galaxies, suggesting new tracing methods.

Paspaliaris et al. (2025) studied this question.

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