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Authors: Brassington, N. J.
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.
First Published: 1-Apr-2009
Citation: Astrophysical Journal Supplement Series, 2009, 181 (2), pp. 605-626
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 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.
DOI Link: 10.1088/0067-0049/181/2/605
ISSN: 0067-0049
Type: Journal Article
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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