The Luminosity Function and Clustering of H$\alpha$ Emitting Galaxies at $z\approx4-6$ from a Complete NIRCam Grism Redshift Survey

Understand

We study the luminosity function (LF) and clustering properties of 888 H$\alpha$ emitters (HAEs) at $3.75 < z < 6$ in the GOODS-N field.

• The sample, built from JWST CONGRESS and FRESCO NIRCam grism surveys using a novel redshift assignment algorithm, spans $\sim$62 arcmin$^2$ and reaches $L_{\rm H\alpha} \sim 10^{41.2} {\rm erg s^{-1}}$.
• We identify two prominent filamentary protoclusters at $z \approx 4.41$ and $z \approx 5.19$, hosting 98 and 144 HAEs, respectively.
• The observed H$\alpha$ LFs show similar shallow faint-end slopes for both protocluster and field galaxies at $z=3.75-5$, and for the protocluster at $z=5-6$ ($\alpha\approx 1.2$ to $-1.3$).