Free Access
Issue
A&A
Volume 532, August 2011
Article Number L6
Number of page(s) 8
Section Letters
DOI https://doi.org/10.1051/0004-6361/201117292
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.

Open with DEXTER

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.

Open with DEXTER

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.

Open with DEXTER

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.

Open with DEXTER


© ESO, 2011

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.