The Herschel Fornax Cluster Survey II: FIR properties of optically-selected Fornax cluster galaxies

Abstract

The $Herschel$ Fornax Cluster Survey (HeFoCS) is a deep, far-infrared (FIR) survey of the Fornax cluster. The survey is in 5 $Herschel$ bands (100 - 500 $\mu$m) and covers an area of 16 deg${}^2$ centred on NGC1399. This paper presents photometry, detection rates, dust masses and temperatures using an optically selected sample from the Fornax Cluster Catalogue (FCC). Our results are compared with those previously obtained using data from the $Herschel$ Virgo Cluster Survey (HeViCS). In Fornax, we detect 30 of the 237 (13%) optically selected galaxies in at least one $Herschel$ band. The global detection rates are significantly lower than Virgo, reflecting the morphological make up of each cluster - Fornax has a lower fraction of late-type galaxies. For galaxies detected in at least 3 bands we fit a modified blackbody with a $\beta =2$ emissivity. Detected early-type galaxies (E/S0) have a mean dust mass, temperature, and dust-to-stars ratio of ${\log }_{10}(<M_{dust}>/{\mathrm{M}}_{\odot })=5.82\pm 0.20$, $<T_{dust}>=20.82\pm 1.77$K, and ${\log }_{10}(M_{dust}/M_{stars})=-3.87\pm 0.28$, respectively. Late-type galaxies (Sa to Sd) have a mean dust mass, temperature, and dust-to-stars ratio of ${\log }_{10}(<M_{dust}>/{\mathrm{M}}_{\odot })=6.54\pm 0.19$, $<T_{dust}>=17.47\pm 0.97$K, and ${\log }_{10}(M_{dust}/M_{stars})=-2.93\pm 0.09$, respectively. The different cluster environments seem to have had little effect on the FIR properties of the galaxies and so we conclude that any environment dependent evolution, has taken place before the cluster was assembled.

21 pages and 14 figures

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Cited by in corpus (6)

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• The Fornax 3D project: dust mix and gas properties in the center of early-type galaxy FCC 167
• Far-infrared observations of an unbiased sample of gamma-ray burst host galaxies
• AlFoCS + F3D II: unexpectedly low gas-to-dust ratios in the Fornax galaxy cluster
• A surprising consistency between the far-infrared galaxy luminosity functions of the field and Coma
• Brought to Light III: Colors of Disk and Clump Substructures in Dwarf Early-Type Galaxies of the Fornax Cluster