Free Access
Volume 532, August 2011
Article Number L6
Number of page(s) 8
Section Letters
Published online 21 July 2011

Online material

Table 1

Main properties of XMMU J0338.8+0021.

Table 2

Properties of spectroscopic members of XMMU J0338.8+0021.

thumbnail Fig. 3

Composite rest-frame spectrum of the seven member galaxies. The main features are marked by dotted lines and the total noise spectrum is shown in blue. An LRG template based on z ~ 0.5 luminous red galaxies (Eisenstein et al. 2003) is overplotted in red to show the good match with the low-z template. The spectrum is smoothed with a 7-pixel boxcar filter.

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thumbnail Fig. 4

One-dimensional spectra of the seven confirmed members of XMMU J0338.8+0021, smoothed with a 7 pixel boxcar filter. For each spectrum, an identification label (ID) and the measured redshift is reported. For the brightest component of the BCG (ID:1-A), the same LRG spectrum template used in Fig. 3 is overlaid in blue for comparison. In red, the sky features in absorption (top) and emission (bottom) are shown. The position of the main spectral features, shifted according to the corresponding redshift values, are marked by the vertical dashed lines.

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thumbnail Fig. 5

Two-dimensional reduced spectra (top) and the one-dimensional extracted ones (bottom) for the two BCG components (ID: 1-A, 1-B). In the bottom panel, the ID number and the measured redshift for each spectrum is reported in the top left corner, and the corresponding best-fit LRG template is overlaid in blue. Because of the low signal-to-noise ratio of the data obtained for ID:1-B (whose spectrum is barely distinguishable in the top panel), its redshift value is only tentative. Both spectra have been smoothed with a 7 pixel boxcar filter.

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thumbnail Fig. 6

Close-up z-band image of the BCG of XMMU J0338.8+0021, smoothed with a 0.7 arcsec Gaussian filter. The contours indicate the linearly spaced isophotes of the image cutout and the blue circle refers to an area of 3″ radius. The presence of a double-core system is clearly visible, indicating that the brightest galaxy is experiencing an ongoing assembly process.

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© ESO, 2011

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