IR STIG Seminar

CIBER 4th Flight Fluctuation Analysis: Measurements of Near-IR Auto- and Cross-Power Spectra on Arcminute to Sub-Degree Scales

Richard Feder (UC Berkeley, LBNL)

Near-infrared intensity mapping datasets are sensitive to the integrated emission of all local/extragalactic sources along the line of sight, and offer constraining power on CIB spatial/spectral properties through fluctuation-based measurements. In this talk I will present the results of an angular power spectrum analysis applied to the fourth and final flight of CIBER-1, a sounding rocket payload designed to study the NIR extragalactic background light (EBL). Using improved analysis methods and higher quality imaging data, we detect surface brightness fluctuations on scales ell < 2000 with CIBER auto-power spectra at ~14 and 18 sigma for 1.1 and 1.8 μm, respectively, and at ~10 sigma in cross-power spectra, representing a 5 – 10x improvement in power spectrum sensitivity on several-arcminute scales relative to that of existing studies. Notably, on large scales, the CIBER auto- and cross-power spectra exceed predictions for integrated galactic light (IGL), integrated stellar light (ISL) and scattered diffuse galactic light (DGL) by over an order of magnitude. I will discuss the astrophysical interpretation of these results and, as time permits, highlight NIR intensity mapping prospects with the newly deployed SPHEREx satellite. References: https://arxiv.org/abs/2501.17932; https://arxiv.org/abs/2501.17933 .

Toward Detector Requirements for the Habitable Worlds Observatory's Coronagraphic Instruments

Christopher C. Stark (NASA Goddard Space Flight Center)

The Habitable Worlds Observatory (HWO) seeks to detect and characterize potentially Earth-like planets around other stars from the UV to the NIR. Earth-like exoplanets will be among the faintest objects ever detected by a telescope and will require high efficiency, low noise detectors. The HWO Technology Maturation Project Office is considering a broad range of detector technologies as architecture trades progress. In this talk I will briefly summarize some of the scientific motivators for observations from the UV to NIR. I will then describe the methods HWO will use to estimate the impact of different detector technologies on scientific productivity, discuss the impacts of several different visible wavelength detector technologies, and present preliminary guidelines for NIR detector requirements. Finally, I will discuss our path forward for refining these requirements.

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