well as in the 24 $\mu$m channel of MIPS. Using `TOPCAT` and IDL routines we combined our near-IR and the CXLS DR1 catalogs into a single infrared photometry list with a total of 46983 sources.

![image](f2.pdf){width="6.0in"}

Chandra ACIS Observations {#obs:xray}
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The DR15 cluster was observed with the Imaging Array of the Chandra Advanced CCD Imaging Spectrometer (ACIS-I) on 2011 January 25 (ObsID 12390, P.I. Wright) with net exposure time of 39.875 ks.

We processed the archival raw data using the routines from version 4.5 of the Chandra Interactive Analysis of Observations `CIAO` data analysis system [@Fruscione:2006aa]. We used the `chandra\_repro` reprocessing script to recalibrate our event data in order to ensure that consistent calibration updates were applied to the dataset.

The X-ray image processing was performed as follows: first, we created a exposure-corrected image from our data in the broad band (0.5 to 7 keV with an effective energy of 2.3 keV) using `CIAO/fluximage` routine with a bin size of 1. Second, we applied the `wavedetect` tool to our broad band image in order to identify potential X-ray sources. We used wavelet scales from 1 to 16.5 pixels in s.pdf of $\sqrt{2}$ and a source significance threshold of $1\times10^{-6}$.

