An X-ray-selected galaxy cluster in the lockman hole at redshift 1.753

J. Patrick Henry, Mara Salvato, Alexis Finoguenov, Nicolas Bouche, Hermann Brunner, Vadim Burwitz, Peter Buschkamp, Eiichi Egami, Natasha Förster-Schreiber, Sotiria Fotopoulou, Reinhard Genzel, Hasinger Günther, Vincenzo Mainieri, Manolis Rovilos, G. Szokoly

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

We have discovered an X-ray-selected galaxy cluster with a spectroscopic redshift of 1.753. The redshift is of the brightest cluster galaxy (BCG), which is coincident with the peak of the X-ray surface brightness. We also have concordant photometric redshifts for seven additional candidate cluster members. The X-ray luminosity of the cluster is (3.68 ± 0.70) × 10 43 erg s-1 in the 0.1-2.4 keV band. The optical/IR properties of the BCG imply that its formation redshift was ∼5 if its stars formed in a short burst. This result continues the trend from lower redshift in which the observed properties of BCGs are most simply explained by a single monolithic collapse at very high redshift instead of the theoretically preferred gradual hierarchical assembly at later times. However, the models corresponding to different formation redshifts are more clearly separated as our observation epoch approaches the galaxy formation epoch. Although our infrared photometry is not deep enough to define a red sequence, we do identify a few galaxies at the cluster redshift that have the expected red sequence photometric properties.

Original languageEnglish
Pages (from-to)615-624
Number of pages10
JournalAstrophysical Journal
Volume725
Issue number1
DOIs
Publication statusPublished - Dec 10 2010

Fingerprint

galaxies
x rays
optical property
erg
time measurement
infrared photometry
galactic evolution
bursts
brightness
assembly
luminosity
trends
stars
trend

Keywords

  • Galaxies: formation
  • Galaxies:clusters:general
  • X-rays: general

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics
  • Nuclear and High Energy Physics

Cite this

Henry, J. P., Salvato, M., Finoguenov, A., Bouche, N., Brunner, H., Burwitz, V., ... Szokoly, G. (2010). An X-ray-selected galaxy cluster in the lockman hole at redshift 1.753. Astrophysical Journal, 725(1), 615-624. https://doi.org/10.1088/0004-637X/725/1/615

An X-ray-selected galaxy cluster in the lockman hole at redshift 1.753. / Henry, J. Patrick; Salvato, Mara; Finoguenov, Alexis; Bouche, Nicolas; Brunner, Hermann; Burwitz, Vadim; Buschkamp, Peter; Egami, Eiichi; Förster-Schreiber, Natasha; Fotopoulou, Sotiria; Genzel, Reinhard; Günther, Hasinger; Mainieri, Vincenzo; Rovilos, Manolis; Szokoly, G.

In: Astrophysical Journal, Vol. 725, No. 1, 10.12.2010, p. 615-624.

Research output: Contribution to journalArticle

Henry, JP, Salvato, M, Finoguenov, A, Bouche, N, Brunner, H, Burwitz, V, Buschkamp, P, Egami, E, Förster-Schreiber, N, Fotopoulou, S, Genzel, R, Günther, H, Mainieri, V, Rovilos, M & Szokoly, G 2010, 'An X-ray-selected galaxy cluster in the lockman hole at redshift 1.753', Astrophysical Journal, vol. 725, no. 1, pp. 615-624. https://doi.org/10.1088/0004-637X/725/1/615
Henry JP, Salvato M, Finoguenov A, Bouche N, Brunner H, Burwitz V et al. An X-ray-selected galaxy cluster in the lockman hole at redshift 1.753. Astrophysical Journal. 2010 Dec 10;725(1):615-624. https://doi.org/10.1088/0004-637X/725/1/615
Henry, J. Patrick ; Salvato, Mara ; Finoguenov, Alexis ; Bouche, Nicolas ; Brunner, Hermann ; Burwitz, Vadim ; Buschkamp, Peter ; Egami, Eiichi ; Förster-Schreiber, Natasha ; Fotopoulou, Sotiria ; Genzel, Reinhard ; Günther, Hasinger ; Mainieri, Vincenzo ; Rovilos, Manolis ; Szokoly, G. / An X-ray-selected galaxy cluster in the lockman hole at redshift 1.753. In: Astrophysical Journal. 2010 ; Vol. 725, No. 1. pp. 615-624.
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