Noise characterization of line intensity mapping observations with SuMAC at the LMT

Le résumé fourni par la source

The SuperSpec-MUSCAT Collaboration (SuMAC) combines the SuperSpec on-chip spectrometer with the MUSCAT camera at the Large Millimeter Telescope (LMT) to explore future Line Intensity Mapping (LIM) observations. SuperSpec is a dual-polarization KID-based spectrometer covering the 190–320 GHz atmospheric window with a spectral resolution of R~120. We present a preliminary noise characterization of LIM-like observations acquired during the Summer 2025 campaign using scans of the galaxy cluster Abell 370. Power spectral density analyses of detector timestreams are used to investigate atmospheric and instrumental noise under different observing configurations, including varying scan speeds and observations with the optical chopper enabled and disabled. These results provide an initial assessment of instrument performance and establish a framework for future studies of atmospheric mitigation, detector correlations, and map-level sensitivity for upcoming SuperSpec LIM surveys.

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