AlFoCS + F3D II: unexpectedly low gas-to-dust ratios in the Fornax galaxy cluster

Abstract

We combine observations from ALMA, ATCA, MUSE, andHerschel to study gas-to-dust ratios in 15 Fornax cluster galaxies detected in the FIR/sub-mm by Herschel and observed by ALMA as part of the ALMA Fornax Cluster Survey (AlFoCS). The sample spans a stellar mass range of 8.3 $\le$ log (M${}_{\ast }$ / M${}_{\odot }$) $\le$ 11.16, and a variety of morphological types. We use gas-phase metallicities derived from MUSE observations (from the Fornax3D survey) to study these ratios as a function of metallicity, and to study dust-to-metal ratios, in a sub-sample of nine galaxies. We find that gas-to-dust ratios in Fornax galaxies are systematically lower than those in field galaxies at fixed stellar mass/metallicity. This implies that a relatively large fraction of the metals in these Fornax systems is locked up in dust, which is possibly due to altered chemical evolution as a result of the dense environment. The low ratios are not only driven by HI deficiencies, but H${}_2$-to-dust ratios are also significantly decreased. This is different in the Virgo cluster, where low gas-to-dust ratios inside the virial radius are driven by low HI-to-dust ratios, while H${}_2$-to-dust ratios are increased. Resolved observations of NGC1436 show a radial increase in H${}_2$-to-dust ratio, and show that low ratios are present throughout the disc. We propose various explanations for the low H${}_2$-to-dust ratios in the Fornax cluster, including the more efficient stripping of H${}_2$ compared to dust, more efficient enrichment of dust in the star formation process, and altered ISM physics in the cluster environment.

arXiv commentAccepted for publication in MNRAS. 21 pages, 12 figures, and 3 tables

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