Dr. Jhen-Yu Chen: "Self-consistent Color-Stellar Mass-to-light Ratio Relations for Low Surface Brightness Galaxies"

時間/地點: 2021-05-12 12:10 [S4-1013]



The color-stellar mass-to-light ratio relation (CMLR) is a widely accepted tool for estimating the stellar mass (M*) of a galaxy. However, an individual CMLR tends to give distinct M* for a same galaxy when it is applied in different bands. Examining five representative CMLRs from the literature, we find that the difference in M* predicted in different bands from optical to near-infrared by a CMLR is 0.1 ∼ 0.3 dex. Based on a sample of low surface brightness galaxies that covers a wide range of color and luminosity, we therefore recalibrated each original CMLR in r, i, z, J, H, and K bands to give internally self-consistent M* for a same galaxy. The g-r is the primary color indicator in the recalibrated relations, which show little dependence on red (r-z) or near-infrared (J-K) colors. Additionally, the external discrepancies in the originally predicted γ* by the five independent CMLRs have been greatly reduced after recalibration, especially in the near-infrared bands, implying that the near-infrared luminosities are more robust in predicting γ*. For each CMLR, the recalibrated relations provided in this work could produce internally self-consistent M* from divergent photometric bands, and are extensions of the recalibrations from the Johnson-Cousin filter system by the pioneering work of McGaugh & Schombert to the filter system of the Sloan Digital Sky Survey.

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