Paper

{
  "raw_xml": "<entry>\n    <id>http://arxiv.org/abs/2603.03797v1</id>\n    <title>The Stellar Mass Function for Nine Massive Galaxy Clusters in the Local Universe</title>\n    <updated>2026-03-04T07:19:32Z</updated>\n    <link href='https://arxiv.org/abs/2603.03797v1' rel='alternate' type='text/html'/>\n    <link href='https://arxiv.org/pdf/2603.03797v1' rel='related' title='pdf' type='application/pdf'/>\n    <summary>We measure galaxy stellar mass functions (SMFs) for nine of the most massive galaxy clusters in the local universe ($0.07 &lt; z &lt; 0.11$) using deep and complete spectroscopy from the MAssive Cluster Survey with Hectospec (MACH). We construct the cluster SMFs down to $\\log(M_*/M_\\odot) \\gtrsim 8.5$. For comparison, we measure the SMF for field galaxies, complete to $\\log(M_*/M_\\odot) \\gtrsim 10.5$, based on Sloan Digital Sky Survey (SDSS) spectroscopy over the same redshift range. The mean MACH SMF shows a shape similar to that of the field SMF but with a significantly higher amplitude at $\\log(M_*/M_\\odot) &lt; 11.4$. At $\\log(M_*/M_\\odot) &gt; 11.4$, the MACH SMF shows a clear excess, indicating the contribution of massive galaxies, including Brightest Cluster Galaxies (BCGs). Based on homogeneous MACH spectroscopy, we compare SMF shapes for quiescent and star-forming members as a function of cluster-centric distance. The quiescent SMFs display a curved shape with a peak at $\\log(M_*/M_\\odot) \\approx 10.5$; the star-forming SMFs decline monotonically with increasing stellar mass. We further compare the mean MACH SMF with SMFs derived from similarly massive clusters in the IllustrisTNG-300 simulations. The shape of the observed and simulated SMFs agree well overall. However, the MACH clusters contain roughly a factor of two more galaxies at $9.0 &lt; \\log(M_*/M_\\odot) &lt; 10.5$. These results demonstrate that constructing cluster SMFs from complete spectroscopic samples can test simulations and provide powerful constraints on galaxy formation and evolution in dense environments.</summary>\n    <category scheme='http://arxiv.org/schemas/atom' term='astro-ph.GA'/>\n    <category scheme='http://arxiv.org/schemas/atom' term='astro-ph.CO'/>\n    <published>2026-03-04T07:19:32Z</published>\n    <arxiv:comment>23 pages, 17 figures, 6 tables, Aceepted for publication in The Astrophysical Journal</arxiv:comment>\n    <arxiv:primary_category term='astro-ph.GA'/>\n    <author>\n      <name>Jong-In Park</name>\n    </author>\n    <author>\n      <name>Jubee Sohn</name>\n    </author>\n    <author>\n      <name>Margaret J. Geller</name>\n    </author>\n    <author>\n      <name>Ken J. Rines</name>\n    </author>\n    <author>\n      <name>Antonaldo Diaferio</name>\n    </author>\n  </entry>"
}