The InfraRed Imaging Spectrograph (IRIS) for TMT: photometric characterization of anisoplanatic PSFs and testing of PSF-Reconstruction via AIROPA

Rundquist, Nils-Erik; Wright, Shelley A.; Schöck, Matthias; Surya, Arun; Lu, Jessica R.; Turri, Paolo; Chapin, Edward L.; Chisholm, Eric; Do, Tuan; Dunn, Jennifer; Ghez, A. M.; Hayano, Yutaka; Johnson, Chris; Larkin, James E.; Riddle, Reed; Sohn, Ji Man; Suzuki, Ryuji; Walth, Gregory; Zonca, A.

doi:10.1117/12.2562773

Cited by 4 publications

(2 citation statements)

References 10 publications

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“…More measurements will be done with current telescopes, like James Webb Space Telescope [63] and Very Large Telescope Interferometer [64], as well as by future telescopes, such as China Space Station Telescope [65], European Extremely Large Telescope [66], Thirty Meter Telescope [67], Giant Magellan Telescope [68], and Legacy Survey of Space and Time [69], in the outer MW region with r ∼ 100-200 kpc. It can be expected that better and more data can be obtained by these telescopes, and the accuracy of measurements will be improved significantly in the near future.…”

Section: Resultsmentioning

confidence: 99%

Dark energy on astrophysical scales and its detection in the Milky Way

Zhang,

Zhang

2023

J. Cosmol. Astropart. Phys.

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The origin and nature of dark energy is one of the most significant challenges in modern science. This research aims to investigate dark energy on astrophysical scales and provide a cosmology-independent method to measure its equation-of-state parameter w. To accomplish this, we introduce the concept of a perfect fluid in any static, curved spacetime, and express the energy-momentum tensor of the perfect fluid in a general isotropic form, namely Weinberg's isotropic form. This enables us to define an equation-of-state parameter in a physical and global manner. Within this theoretical framework, we demonstrate that the energy-momentum tensor of dark energy on different scales can take the general isotropic form. Furthermore, we explore the SdS w spacetime and establish its connection with dark energy in cosmology through the equation-of-state parameter w. In the SdS w spacetime, a repulsive dark force can be induced by dark energy locally. We then apply the concept of the dark force to realistic astrophysical systems using the Poisson equation. Finally, we find that an anomaly in the Milky Way rotation curve can be quantitatively interpreted by the dark force. By fitting the galactic curve, we are able to obtain the value of the equation-of-state parameter of dark energy, independently of specific dark energy models.

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Section: Resultsmentioning

confidence: 99%

Dark energy on astrophysical scales and its detection in the Milky Way

Zhang,

Zhang

2023

J. Cosmol. Astropart. Phys.

View full text Add to dashboard Cite

show abstract

“…More measurements will be done with current telescopes, like James Webb Space Telescope [45] and Very Large Telescope Interferometer [46], as well as by future telescopes, such as European Extremely Large Telescope [47], Thirty Meter Telescope [48], Giant Magellan Telescope [49], and Legacy Survey of Space and Time [50], in the outer MW region with r ∼ 100 − 200 kpc. It can be expected that better data and more data can be obtained by these telescopes, and the accuracy of measurements will be improved significantly in the near future.…”

Section: Resultsmentioning

confidence: 99%

The development of geophysics in the early period of the People's Republic of China based on the Institute of Geophysics, Chinese Academy of Sciences (1950–1966)

Zhang

Wang

2021

Hist. Geo Space. Sci.

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Abstract. From the perspective of the social history of science and transnational history, this paper reviewed the development of the Institute of Geophysics, Chinese Academy of Sciences (IGCAS), rather than focusing on its scientific achievements. Before the 1950s, the discipline of geophysics in China, except for the branch of meteorology, had a very weak foundation, and few researchers were engaged in it. The systematic development of geophysics began with the establishment of IGCAS. In this paper, the early development of IGCAS was researched thoroughly. At first, we briefly reviewed the establishment process for IGCAS. After being promoted by the desire of scientists to develop big geophysics, the Chinese Academy of Sciences (CAS) integrated scattered academic forces, which included geomagnetism and geophysical exploration, to establish the IGCAS. The IGCAS was based on the Institute of Meteorology of Academia Sinica in the Republic of China era. After that, we summarized work done by IGCAS in the development of geophysics from the 1950s to 1966, the year in which the Cultural Revolution began. We focused on policy support, adjustment of organizational structure, and scientific capacity building, when China was facing an isolated international diplomatic environment, continuous domestic political movements, and an austere social economy. Then, to bolster the development of geophysics in China, the slogan of “Missions Drive Disciplines”, which was instilled and implemented by the Chinese scientific community, was introduced briefly. The scientific development of the IGCAS and typical examples in several branches of geophysics, which included atmospheric science, seismology, space physics, and other fields, were systematically summarized and benchmarked to the international academic level. We then summarized the basic research on geophysics carried out by the institute in economic construction and national defense. Finally, the experience and lessons in the development of this institute and its effect on geophysics in China were explored.

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Liger at W.M. Keck Observatory: overall design and science drivers

Wright,

Jones,

Larkin

et al. 2024

Ground-Based and Airborne Instrumentation for Astronomy X

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Liger is a next-generation near-infrared (0.81 -2.45 µm) integral field spectrograph (IFS) and imaging camera for the W. M. Keck Observatory (WMKO) adaptive optics (AO) system. The instrument concept originated by coupling designs from WMKO AO instruments and the future Thirty Meter Telescope IRIS spectrograph. Liger is designed for the Keck I telescope to operate behind the upcoming Keck All-sky Precision Adaptive optics (KAPA) system. The imaging camera sequentially feeds an IFS that makes use of slicer assembly for the coarsest sampling (75 mas and 150 mas per spaxel) and lenslet array (14 mas and 31 mas per spaxel) for diffraction-limited sampling. The imaging camera makes use of off-axis parabolas and a Hawaii-2RG detector to achieve a 14 mas/pixel plate scale and 20.5"×20.5" field of view. The IFS offers a range of spectral resolving power of R=4,000 -10,000 and yields large fields of view for an AO-fed IFS. Liger will enable new science by providing enhanced capabilities, including higher spectral resolving power, access to shorter wavelengths, and larger fields of view than any current or planned ground-or space-based IFS system. Liger will be able to unlock previously inaccessible science across a wide range of the cosmos, such as dark matter substructure, supermassive black holes, the Galactic Center, exoplanet atmospheres, and the time-variable Solar System. We present the overall design of the Liger subsystems and review unique science drivers.

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The InfraRed Imaging Spectrograph (IRIS) for TMT: photometric characterization of anisoplanatic PSFs and testing of PSF-Reconstruction via AIROPA

Cited by 4 publications

References 10 publications

Dark energy on astrophysical scales and its detection in the Milky Way

Dark energy on astrophysical scales and its detection in the Milky Way

The development of geophysics in the early period of the People's Republic of China based on the Institute of Geophysics, Chinese Academy of Sciences (1950–1966)

Liger at W.M. Keck Observatory: overall design and science drivers

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