CODEX clusters. The Survey, the Catalog, and Cosmology of the X-ray Luminosity Function. (arXiv:1912.03262v1 [astro-ph.CO])
<a href="http://arxiv.org/find/astro-ph/1/au:+Finoguenov_A/0/1/0/all/0/1">A. Finoguenov</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Rykoff_E/0/1/0/all/0/1">E. Rykoff</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Clerc_N/0/1/0/all/0/1">N. Clerc</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Costanzi_M/0/1/0/all/0/1">M. Costanzi</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Hagstotz_S/0/1/0/all/0/1">S. Hagstotz</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Chitham_J/0/1/0/all/0/1">J. Ider Chitham</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Kiiveri_K/0/1/0/all/0/1">K. Kiiveri</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Kirkpatrick_C/0/1/0/all/0/1">C. C. Kirkpatrick</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Capasso_R/0/1/0/all/0/1">R. Capasso</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Comparat_J/0/1/0/all/0/1">J. Comparat</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Damsted_S/0/1/0/all/0/1">S. Damsted</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Dupke_R/0/1/0/all/0/1">R. Dupke</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Erfanianfar_G/0/1/0/all/0/1">G. Erfanianfar</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Henry_J/0/1/0/all/0/1">J. Patrick Henry</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Kaefer_F/0/1/0/all/0/1">F. Kaefer</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Kneib_J/0/1/0/all/0/1">J-P. Kneib</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Lindholm_V/0/1/0/all/0/1">V. Lindholm</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Rozo_E/0/1/0/all/0/1">E. Rozo</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Waerbeke_L/0/1/0/all/0/1">L. van Waerbeke</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Weller_J/0/1/0/all/0/1">J. Weller</a>
Large area catalogs of galaxy clusters constructed from ROSAT All Sky Survey Large area catalogs of galaxy clusters constructed from ROSAT All Sky Survey http://arxiv.org/icons/sfx.gif
provide the base for our knowledge on the population of clusters thanks to the
long-term multiwavelength efforts on their follow-up. Advent of large area
photometric surveys superseding in depth previous all-sky data allows us to
revisit the construction of X-ray cluster catalogs, extending the study to
lower cluster masses and to higher redshifts and to provide the modelling of
the selection function. We perform a wavelet detection of X-ray sources and
make extensive simulations of the detection of clusters in the RASS data. We
assign an optical richness to each of the 24,788 detected X-ray sources in the
10,382 square degrees of SDSS BOSS area, using redMaPPer version 5.2. We name
this survey COnstrain Dark Energy with X-ray (CODEX) clusters. We show that
there is no obvious separation of sources on galaxy clusters and AGN, based on
distribution of systems on their richness. This is a combination of increasing
number of galaxy groups and their selection as identification of an X-ray
sources either by chance or due to groups hosting an AGN. To clean the sample,
we use a cut on the optical richness at the level corresponding to the 10%
completeness of the survey and include it into the modelling of cluster
selection function. We present the X-ray catalog extending to a redshift of
0.6. CODEX is the first large area X-ray selected catalog of Northern clusters
reaching the fluxes of $10^{-13}$ ergs s$^{-1}$ cm$^{-2}$. We provide the
modelling of the sample selection and discuss the redshift evolution of the
high end of the X-ray luminosity function (XLF). Our results on $z<0.3$ XLF are
in agreement with previous studies, while we provide new constraints on the
$0.3
provide the base for our knowledge on the population of clusters thanks to the
long-term multiwavelength efforts on their follow-up. Advent of large area
photometric surveys superseding in depth previous all-sky data allows us to
revisit the construction of X-ray cluster catalogs, extending the study to
lower cluster masses and to higher redshifts and to provide the modelling of
the selection function. We perform a wavelet detection of X-ray sources and
make extensive simulations of the detection of clusters in the RASS data. We
assign an optical richness to each of the 24,788 detected X-ray sources in the
10,382 square degrees of SDSS BOSS area, using redMaPPer version 5.2. We name
this survey COnstrain Dark Energy with X-ray (CODEX) clusters. We show that
there is no obvious separation of sources on galaxy clusters and AGN, based on
distribution of systems on their richness. This is a combination of increasing
number of galaxy groups and their selection as identification of an X-ray
sources either by chance or due to groups hosting an AGN. To clean the sample,
we use a cut on the optical richness at the level corresponding to the 10%
completeness of the survey and include it into the modelling of cluster
selection function. We present the X-ray catalog extending to a redshift of
0.6. CODEX is the first large area X-ray selected catalog of Northern clusters
reaching the fluxes of $10^{-13}$ ergs s$^{-1}$ cm$^{-2}$. We provide the
modelling of the sample selection and discuss the redshift evolution of the
high end of the X-ray luminosity function (XLF). Our results on $z<0.3$ XLF are
in agreement with previous studies, while we provide new constraints on the
$0.3<z<0.6$ XLF. We find a lack of strong redshift evolution of the XLF and
consider possibilities to explain it within a flat $Lambda$CDM.
