The Secret Identities of X-Ray Sources in the Small Magellanic Cloud: Optical and Infrared Observations of X-Ray Source Companions

Astronomy and Astrophysics – Astronomy

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Scientific paper

We present ground-based optical, archival 2MASS near-infrared and Spitzer Space Telescope mid-infrared observations of the counterparts and local environments of X-ray sources in the Small Magellanic Cloud. We have constructed broad-band spectral energy distributions spanning the optical to mid-infrared for known and candidate counterparts. Using the spectral energy distributions, we characterize the stellar component of the X-ray emitting systems. We also show multicolor mid-infrared images of the environments around the X-ray sources. With this sample, we hope to have the tools for a study of the SMC as a separate galaxy from the Milky Way. By comparing X-ray binaries between the two galaxies, we could infer, for example, how evolutionary history reflects host metallicity.

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