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DEEP Chandra MONITORING OBSERVATIONS



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D RAFT VERSION F EBRUARY 10 2009 Preprint typeset using LATEX style emulateapj v 10 09 06 DEEP Chandra MONITORING OBSERVATIONS OF NGC 4278 CATALOG OF SOURCE PROPERTIES N J B RASSINGTON G FABBIANO D W K IM A Z EZAS Harvard Smithsonian Center for Astrophysics 60 Garden Street Cambridge MA 02138 S Z EPF A K UNDU arXiv 0902 1652v1 astro ph CO 10 Feb 2009 Department of Physics and Astronomy Michigan State University East Lansing MI 48824 2320 L A NGELINI Laboratory for X Ray Astrophysics NASA Goddard Space Flight Center Greenbelt MD 20771 R L DAVIES Sub Department of Astrophysics University of Oxford Oxford OX1 3RH UK J G ALLAGHER Department of Astronomy University of Wisconsin Madison WI 53706 1582 V K ALOGERA T F RAGOS Department of Physics and Astronomy Northwestern University Evanston IL 60208 A R K ING Theoretical Astrophysics Group University of Leicester Leicester LE1 7RH UK S P ELLEGRINI Dipartimento di Astronomia Universita di Bologna Via Ranzani 1 40127 Bologna Italy G T RINCHIERI INAF Osservatorio Astronomico di Brera Via Brera 28 20121 Milan Italy Draft version February 10 2009 ABSTRACT We 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 D25 ellipse of the galaxy These 236 sources range in LX from 3 5 1036 erg s 1 with 3 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 globular cluster these sources tend to have high X ray luminosity with ten of these sources exhibiting LX 1 1038 erg s 1 From X ray source photometry it has been determined that the majority of the 236 point sources that



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