Detecting high-$z$ galaxies in the Near Infrared Background

Abstract

Emission from high-$z$ galaxies must unquestionably contribute to the near-infrared background (NIRB). However, this contribution has so far proven difficult to isolate even after subtracting the resolved galaxies to deep levels. Remaining NIRB fluctuations are dominated by unresolved low-$z$ galaxies on small angular scales, and by an unidentified component with unclear origin on large scales ($\approx 1000^{\prime \prime }$). In this paper, by analyzing mock maps generated from semi-numerical simulations and empirically determined $L_{\mathrm{UV}}-M_{\mathrm{h}}$ relations, we find that fluctuations associated with galaxies at $5<z<10$ amount to several percent of the unresolved NIRB flux fluctuations. We investigate the properties of this component for different survey areas and limiting magnitudes. In all cases, we show that this signal can be efficiently, and most easily at small angular scales, isolated by cross-correlating the source-subtracted NIRB with Lyman Break Galaxies (LBGs) detected in the same field by {\tt HST} surveys. This result provides a fresh insight into the properties of reionization sources.

MNRAS in press, 8 pages, 7 figures

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Cited by in corpus (5)

• Faint progenitors of luminous $z\sim 6$ quasars: why don't we see them?
• Studying high-z galaxies with [CII] intensity mapping
• The SPLASH and Chandra COSMOS Legacy Survey: the Cross Power Between Near-Infrared and X-Ray Background Fluctuations
• Studying the ICM in clusters of galaxies via surface brightness fluctuations of the cosmic X-ray background
• Signatures of reionization feedback in the near-infrared background