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dc.contributor.authorBrassington, Nicola
dc.contributor.authorFabbiano, G.
dc.contributor.authorKim, D.-W.
dc.contributor.authorZezas, A.
dc.contributor.authorZepf, S.
dc.contributor.authorKundu, A.
dc.contributor.authorAngelini, L.
dc.contributor.authorDavies, R. L.
dc.contributor.authorGallagher, J.
dc.contributor.authorKalogera, V.
dc.contributor.authorFragos, T.
dc.contributor.authorKing, A.R.
dc.contributor.authorPellegrini, S.
dc.contributor.authorTrinchieri, G.
dc.date.accessioned2012-04-03T08:01:04Z
dc.date.available2012-04-03T08:01:04Z
dc.date.issued2009-04-01
dc.identifier.citationBrassington , N , Fabbiano , G , Kim , D-W , Zezas , A , Zepf , S , Kundu , A , Angelini , L , Davies , R L , Gallagher , J , Kalogera , V , Fragos , T , King , A R , Pellegrini , S & Trinchieri , G 2009 , ' Deep Chandra Monitoring Observations of NGC 4278 : Catalog of Source Properties ' , Astrophysical Journal, Supplement Series , vol. 181 , pp. 605-626 . https://doi.org/10.1088/0067-0049/181/2/605
dc.identifier.issn0067-0049
dc.identifier.otherPURE: 701828
dc.identifier.otherPURE UUID: 02470fde-3e09-4d9a-a8f0-a9f155e91a22
dc.identifier.otherBibtex: urn:067718b3844cbc1d6fa27d1112f756fe
dc.identifier.otherScopus: 70549097747
dc.identifier.urihttp://hdl.handle.net/2299/8154
dc.description.abstractWe present the properties of the discrete X-ray sources detected in our monitoring program of the globular cluster (GC) rich elliptical galaxy, NGC 4278, observed with Chandra ACIS-S in six separate pointings, resulting in a co-added exposure of 458 ks. From this deep observation, 236 sources have been detected within the region overlapped by all observations, 180 of which lie within the D 25 ellipse of the galaxy. These 236 sources range in L X from 3.5 × 1036 erg s-1 (with 3σ upper limit <=1 × 1037 erg s-1) to ~2 × 1040 erg s-1, including the central nuclear source which has been classified as a LINER. From optical data, 39 X-ray sources have been determined to be coincident with a GC, these sources tend to have high X-ray luminosity, with 10 of these sources exhibiting L X > 1 × 1038 erg s-1. From X-ray source photometry, it has been determined that the majority of the 236 point sources that have well-constrained colors have values that are consistent with typical low-mass X-ray binary spectra, with 29 of these sources expected to be background objects from the log N-log S relation. There are 103 sources in this population that exhibit long-term variability, indicating that they are accreting compact objects. Three of these sources have been identified as transient candidates, with a further three possible transients. Spectral variations have also been identified in the majority of the source population, where a diverse range of variability has been identified, indicating that there are many different source classes located within this galaxy.en
dc.format.extent22
dc.language.isoeng
dc.relation.ispartofAstrophysical Journal, Supplement Series
dc.rightsOpen
dc.subjectgalaxies: individual: NGC 4278, X-rays: binaries, X-rays: galaxies
dc.titleDeep Chandra Monitoring Observations of NGC 4278 : Catalog of Source Propertiesen
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.contributor.institutionScience & Technology Research Institute
dc.contributor.institutionCentre for Astrophysics Research
dc.description.statusPeer reviewed
dc.relation.schoolSchool of Physics, Astronomy and Mathematics
dc.description.versiontypeSubmitted Version
dcterms.dateAccepted2009-04-01
rioxxterms.versionSMUR
rioxxterms.versionofrecordhttps://doi.org/10.1088/0067-0049/181/2/605
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue
herts.rights.accesstypeOpen


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