Yun-Ting Cheng

SPHEREx Mapping of Diffuse PAH and H ii Emission in the Galactic Plane

Giulia Murgia, A. Cukierman, Brandon S. Hensley, M. L. N. Ashby et autres

Abstract We present preliminary SPHEREx maps of diffuse Galactic emission tracing polycyclic aromatic hydrocarbons (PAHs) and ionized hydrogen gas, and we study their relationship across the Galactic plane. Since its launch in early 2025, the SPHEREx space telescope has been conducting an …

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Development of a planar cable-driven parallel robot for submillimeter and terahertz beam mapping measurements

Evan C. Mayer, Ian N. Lowe, Daniel P. Marrone, James J. Bock et autres

The spatial sensitivity pattern of millimeter-wavelength receivers is an important diagnostic of performance and is affected by the alignment of coupling optics. Characterization can be challenging in the field, particularly in the decentered and tightly packed optical configurations that are employed for …

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TIME Commissioning Observations. I. Mapping Dust and Molecular Gas in the Sgr A Molecular Cloud Complex at the Galactic Center

Selina F. Yang, Sophie M. McAtee, Benjamin J. Vaughan, A. T. Crites et autres

Abstract We present the processing of an observation of Sagittarius A (Sgr A) with the Tomographic Ionized-carbon Mapping Experiment (TIME), part of the 2021–2022 commissioning run, to verify TIME’s hyperspectral imaging capabilities for future line-intensity mapping. Using an observation of Jupiter to …

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The SPHEREx Ices Investigation: An Overview

Gary J. Melnick, Joseph L. Hora, Matthew L. N. Ashby, Volker Tolls et autres

Abstract SPHEREx is a NASA mission designed to perform an all-sky spectroscopic survey in the 0.75–5 μ m wavelength range. Its primary science objectives are to investigate: (1) inflationary cosmology; (2) the history of galaxy formation; and (3) the abundance of molecular …

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Spectral Response of SPHEREx

H. Hui, J. J. Bock, Samuel Condon, C. D. Dowell et autres

Abstract The Spectro Photometer for the History of the Universe, Epoch of Reionization, and Ices Explorer (SPHEREx) is conducting the first all-sky near-infrared spectral survey spanning 0.75–5.0 μ m with resolving power R ≈ 35–130. Linear variable filters mounted in front of …

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CIBER Fourth-flight Fluctuation Analysis: Measurements of Near-infrared Auto and Cross Power Spectra on Arcminute to Subdegree Scales

Richard M. Feder, J. J. Bock, Yun-Ting Cheng, Asantha Cooray et autres

Abstract We present new anisotropy measurements in the near-infrared for angular multipoles 300 < ℓ < 10 5 using imaging data at 1.1 and 1.8 μ m from the fourth flight of the Cosmic Infrared Background Experiment (CIBER). Using improved analysis methods …

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The SPHEREx Satellite Mission

J. J. Bock, Asad M. Aboobaker, Joseph Adamo, Rachel Akeson et autres

SPHEREx, a NASA explorer satellite launched on 11 March 2025, is carrying out the first all-sky near-infrared spectral survey. The satellite observes in 102 spectral bands from 0.75 to 5.0 um with a resolving power ranging from 35 to 130 in 6.2 …

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The SPHEREx Sky Simulator: Science Data Modeling for the First All-sky Near-infrared Spectral Survey

B. P. Crill, Yoonsoo P. Bach, Sean Bryan, Jean Choppin de Janvry et autres

Abstract We describe the SPHEREx Sky Simulator (henceforth the Simulator), a software tool designed to model science data for NASA’s SPHEREx mission that will carry out a series of all-sky spectrophotometric surveys at ∼6″ spatial resolution in 102 spectral channels spanning 0.75–5 …

Feature Intensity Mapping: Polycyclic Aromatic Hydrocarbon Emission from All Galaxies Across Cosmic Time

Yun-Ting Cheng, Brandon S. Hensley, Thomas S. -Y. Lai

Abstract Line intensity mapping (LIM) is an emerging technique for probing the aggregate emission of a spectral line from all sources, without requiring individual detections. Through the wavelength–redshift relation, one can map the line-of-sight evolution of the line emission that traces the …

The Potential of the SPHEREx Mission for Characterizing Polycyclic Aromatic Hydrocarbon 3.3 μm Emission in Nearby Galaxies

Edward Zhang, Andreas L. Faisst, B. P. Crill, Hanae Inami et autres

Abstract Together with gas, stars, and supermassive black holes, dust is crucial in stellar and galaxy evolution. Hence, understanding galaxies’ dust properties across cosmic time is critical to studying their evolution. In addition to photometric constraints on the absorption of blue light …

Simulating Spectral Confusion in SPHEREx Photometry and Redshifts

Zhaoyu Huai, James J. Bock, Yun-Ting Cheng, Jean Choppin de Janvry et autres

We model the impact of source confusion on photometry and the resulting spectrophotometric redshifts for SPHEREx, a NASA Medium-Class Explorer that is carrying out an all-sky near-infrared spectral survey. Spectral confusion from untargeted background galaxies degrades sensitivity and introduces a spectral bias. …

CIBER Fourth Flight Fluctuation Analysis: Pseudopower Spectrum Formalism, Improved Source Masking, and Validation on Mocks

Richard M. Feder, J. J. Bock, Yun-Ting Cheng, Asantha Cooray et autres

Abstract Precise, unbiased measurements of extragalactic background anisotropies require careful treatment of systematic effects in fluctuation-based, broadband intensity mapping measurements. In this paper, we detail improvements in methodology for the Cosmic Infrared Background Experiment (CIBER), concentrating on flat field errors and source …

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