Far Ultraviolet Morphology of Star Forming Filaments in Cool Core Brightest Cluster Galaxies

Grant R. Tremblay, Christopher P. O'Dea, Stefi A. Baum, Rupal Mittal, Michael McDonald, Françoise Combes, Yuan Li, Brian McNamara, Malcolm N. Bremer, Tracy E. Clarke, Megan Donahue, Alastair C. Edge, Andrew C. Fabian, Stephen L. Hamer, Michael T. Hogan, Raymond Oonk, Alice C. Quillen, Jeremy S. Sanders, Philippe Salomé, G. Mark Voit

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We present a multiwavelength morphological analysis of star forming clouds and filaments in the central ($<50$ kpc) regions of 16 low redshift ($z 5$ \Msol) stars reveals filamentary and clumpy morphologies, which we quantify by means of structural indices. The FUV data are compared with X-ray, Ly$\alpha$, narrowband H$\alpha$, broadband optical/IR, and radio maps, providing a high spatial resolution atlas of star formation locales relative to the ambient hot ($\sim10^{7-8}$ K) and warm ionised ($\sim 10^4$ K) gas phases, as well as the old stellar population and radio-bright AGN outflows. Nearly half of the sample possesses kpc-scale filaments that, in projection, extend toward and around radio lobes and/or X-ray cavities. These filaments may have been uplifted by the propagating jet or buoyant X-ray bubble, or may have formed {\it in situ} by cloud collapse at the interface of a radio lobe or rapid cooling in a cavity's compressed shell. The morphological diversity of nearly the entire FUV sample is reproduced by recent hydrodynamical simulations in which the AGN powers a self-regulating rain of thermally unstable star forming clouds that precipitate from the hot atmosphere. In this model, precipitation triggers where the cooling-to- freefall time ratio is $t_{\mathrm{cool}}/t_{\mathrm{ff}}\sim 10$. This condition is roughly met at the maxmial projected FUV radius for more than half of our sample, and clustering about this ratio is stronger for sources with higher star formation rates.
Original languageEnglish
Pages (from-to)3768-3800
Number of pages33
JournalMonthly Notices of the Royal Astronomical Society
Issue number4
Early online date28 Jun 2015
Publication statusPublished - 21 Aug 2015

Bibliographical note

36 pages, 30 figures, accepted for publication in MNRAS


  • astro-ph.GA


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