Far-ultraviolet morphology of star-forming filaments in cool core brightest cluster galaxies

摘要: We present a multiwavelength morphological analysis of star-forming clouds and filaments in the central (≲50 kpc) regions 16 low-redshift (z < 0.3) cool core brightest cluster galaxies. New Hubble Space Telescope imaging far-ultraviolet continuum emission from young (≲10 Myr), massive (≳5 M⊙) stars reveals filamentary clumpy morphologies, which we quantify by means structural indices. The FUV data are compared with X-ray, Lyα, narrow-band Hα, broad-band optical/IR, radio maps, providing high spatial resolution atlas star formation locales relative to ambient hot (∼107–8 K) warm ionized (∼104 K) gas phases, as well old stellar population radio-bright active galactic nucleus (AGN) outflows. Nearly half sample possesses kpc-scale that, projection, extend towards around lobes and/or X-ray cavities. These may have been uplifted propagating jet or buoyant bubble, formed situ cloud collapse at interface lobe rapid cooling cavity's compressed shell. diversity nearly entire is reproduced recent hydrodynamical simulations AGN powers self-regulating rain thermally unstable that precipitate atmosphere. In this model, precipitation triggers where cooling-to-free-fall time ratio tcool/tff ∼ 10. This condition roughly met maximal projected radius for more than our sample, clustering about stronger sources higher rates.