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dc.contributor.authorSanders, JSen
dc.contributor.authorFabian, Andrewen
dc.contributor.authorRussell, Helenen
dc.contributor.authorWalker, Stephenen
dc.contributor.authorBlundell, KMen
dc.date.accessioned2017-04-03T14:38:25Z
dc.date.available2017-04-03T14:38:25Z
dc.date.issued2016-08-01en
dc.identifier.issn0035-8711
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/263448
dc.description.abstractThe effects of many physical processes in the intracluster medium of galaxy clusters imprint themselves in X-ray surface brightness images. It is therefore important to choose optimal methods for extracting information from and enhancing the interpretability of such images. We describe in detail a gradient filtering edge detection method that we previously applied to images of the Centaurus cluster of galaxies. The Gaussian gradient filter measures the gradient in the surface brightness distribution on particular spatial scales. We apply this filter on different scales to Chandra X-ray observatory images of two clusters with active galactic nucleus feedback, the Perseus cluster and M 87, and a merging system, A 3667. By combining filtered images on different scales using radial filters spectacular images of the edges in a cluster are produced. We describe how to assess the significance of features in filtered images. We find the gradient filtering technique to have significant advantages for detecting many kinds of features compared to other analysis techniques, such as unsharp masking. Filtering cluster images in this way in a hard energy band allows shocks to be detected.
dc.description.sponsorshipACF, HRR and SAW acknowledge support from the ERC Advanced Grant FEEDBACK. The scientific results reported in this article are based on data obtained from the Chandra Data Archive.
dc.language.isoenen
dc.publisherOxford University Press
dc.subjecttechniques: image processingen
dc.subjectX-rays: galaxies: clustersen
dc.titleDetecting edges in the X-ray surface brightness of galaxy clustersen
dc.typeArticle
prism.endingPage1911
prism.issueIdentifier2en
prism.publicationDate2016en
prism.publicationNameMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETYen
prism.startingPage1898
prism.volume460en
dc.identifier.doi10.17863/CAM.8795
dcterms.dateAccepted2016-05-10en
rioxxterms.versionofrecord10.1093/mnras/stw1119en
rioxxterms.versionVoRen
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserveden
rioxxterms.licenseref.startdate2016-08-01en
dc.contributor.orcidFabian, Andrew [0000-0002-9378-4072]
dc.identifier.eissn1365-2966
rioxxterms.typeJournal Article/Reviewen
cam.issuedOnline2016-05-12en


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