Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-08-08
Astrophys.J. 577 (2002) L89-L92
Astronomy and Astrophysics
Astrophysics
14 pages, 5 figures, to be appeared in ApJ Letters
Scientific paper
10.1086/344400
We have obtained a new high-resolution K'-band image of the central region of the rich X-ray cluster RX J0848.9+4452 at z=1.26. We found that the brightest cluster galaxy (BCG) in the cluster is clearly separated into two distinct objects. Whereas the optical to near-infrared colors of the objects are consistent with the predictions of passive evolution models for galaxies formed at high redshift, the luminosities of the two galaxies are both considerably fainter than predicted by passive evolution of BCG's in low and intermediate redshift clusters. We argue that this is evidence of an on-going merger of normal cluster ellipticals to form the dominant galaxy in the core of RX J0848.9+4452. The two galaxies appear to point towards the nearby cluster ClG J0848+4453 and are aligned with the outer X-ray contour of their parent cluster, supporting a model of BCG formation by collimated infall along the surrounding large-scale structure.
de Propris Roberto
Kajisawa Masaru
Kodama Tadayuki
Koyama Yusei
Nakata Fumiaki
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