Performance Assessment of the KASI-Deep Rolling Imaging Fast-optics Telescope Pathfinder

Byun, Woowon; Ko, Jongwan; Kim, Yunjong; Seon, Kwang‐Il; Chang, Seunghyuk; Kim, Do-Hoon; Choi, Changsu; Chun, Sang-Hyun; Jeon, Young‐Beom; Kim, Jae-Woo; Lee, Chung-Uk; Lee, Yongseok; Park, Hong Soo; Sung, Eon‐Chang; Yoo, Jaewon; Lee, Ga-Young; Lee, Hyoungkwon

doi:10.1088/1538-3873/ac8500

Cited by 5 publications

(2 citation statements)

References 50 publications

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“…We have developed the KASI-Deep Rolling Imaging Fast Telescope (K-DRIFT) pathfinder, which is a confocal off-axis freeform three-mirror system designed for optimally detecting extremely low surface brightness (LSB, below ~1% of the ground-based night sky brightness) features [1]. We have operated the telescope at the Bohyunsan Optical Astronomy Observatory (BOAO) for a year and successfully captured the faint and diffuse stellar structures formed during the evolution of galaxies [2]. Moreover, we demonstrated and confirmed the three primary error sources of the K-DRIFT pathfinder through the end-to-end optical simulation study [3].…”

Section: Introductionmentioning

confidence: 99%

Tolerance analysis of off-axis freeform three-mirror KASI-deep rolling imaging fast telescope

Kim,

Lee,

Kim

et al. 2023

Astronomical Optics: Design, Manufacture, and Test of Space and Ground Systems IV

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We are developing the KASI-Deep Rolling Imaging Fast Telescope Generation 1 (K-DRIFT G1) based on the on-site performance assessment of the K-DRIFT pathfinder. The telescope is a confocal off-axis freeform three-mirror system designed for the detection of extremely low surface brightness structures in the sky. The optical specifications of the K-DRIFT G1 are as follows: the entrance pupil diameter is 300 mm, the focal ratio is 3.5, the field of view is 4.43° × 4.43°, and the image area is 81.2 mm × 81.2 mm with 10 μm pixels. We performed sensitivity analysis and tolerance simulations to integrate and align the system. We present the analysis results and development plan of the K-DRIFT G1.

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Section: Introductionmentioning

confidence: 99%

Tolerance analysis of off-axis freeform three-mirror KASI-deep rolling imaging fast telescope

Kim,

Lee,

Kim

et al. 2023

Astronomical Optics: Design, Manufacture, and Test of Space and Ground Systems IV

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“…This length corresponds to the physical scale of a CCD pixel (∼2″) if clusters are 100 Mpc distant. This particular CCD pixel specification is the same as that of the KASI-Deep Rolling Imaging Fast-optics Telescope pathfinder, which is a new telescope optimized for LSB studies(Byun et al 2022). …”

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confidence: 99%

Formation Channels of Diffuse Lights in Groups and Clusters over Time

Chun,

Shin,

et al. 2024

ApJ

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We explore the formation of the intragroup light and intracluster light, representing diffuse lights within groups and clusters, from the point that z = 1.5. For this, we perform multiresolution cosmological N-body simulations using the “galaxy replacement technique” and identify the progenitors in which the diffuse light stars existed when they fell into the groups or clusters. Our findings reveal that typical progenitors contributing to diffuse lights enter the host halo with massive galaxies containing a stellar mass of 10 < log M gal [ M ⊙ ] < 11 , regardless of the mass or dynamical state of the host halos at z = 0. In cases where the host halos are dynamically unrelaxed or more massive, diffuse lights from massive progenitors with log M gal [ M ⊙ ] > 11 are more prominent, with over half of them already preprocessed before entering the host halo. Additionally, we find that the main formation mechanism of diffuse lights is the stripping process of satellites, and a substantial fraction (40%–45%) of diffuse light stars are linked to the merger tree of the brightest cluster galaxy. Remarkably, all trends persist for groups and clusters at higher redshifts. The fraction of diffuse lights in the host halos with a similar mass decreases as the redshift increases, but they are already substantial at z = 1.5 (∼10%). However, it is crucial to acknowledge that detection limits related to the observable radius and faint-end surface brightness may obscure numerous diffuse light stars and even alter the main formation channel of diffuse lights.

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Introducing the Condor array telescope II – deep imaging observations of the edge-on spiral galaxy NGC 5907 and the NGC 5866 Group: yet another view of the iconic stellar stream

Lanzetta,

Gromoll,

Shara

et al. 2024

Monthly Notices of the Royal Astronomical Society

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We used the Condor array telescope to obtain deep imaging observations through the luminance filter of the entirety of the NGC 5866 Group, including a very extended region surrounding the galaxy NGC 5907 and its stellar stream. We find that the stellar stream consists of a single curved structure that stretches 220 kpc from a brighter eastern stream to a fainter western stream that bends to the north and then curls back toward the galaxy. This result runs contrary to a previous claim of a second loop of the stellar stream but is consistent with another previous description of the overall morphology of the stream. We further find that: (1) an extension of the western stream appears to bifurcate near its apex, (2) there is an apparent gap of ≈6 kpc in the western stream due east of the galaxy, (3) contrary to a previous claim, there is no evidence of the remnant of a progenitor galaxy within the eastern stream, although (4) there are many other possible progenitor galaxies, (5) there is another structure that, if it is at the distance of the galaxy, stretches 240 kpc and contains two very large, very low-surface-brightness ‘patches’ of emission, one of which was noted previously and another of which was not. We note the number and variety of stellar streams in the vicinity of NGC 5907 and the apparent gap in the western stream, which may be indicative of a dark sub-halo or satellite in the vicinity of the galaxy.

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Performance Assessment of the KASI-Deep Rolling Imaging Fast-optics Telescope Pathfinder

Cited by 5 publications

References 50 publications

Tolerance analysis of off-axis freeform three-mirror KASI-deep rolling imaging fast telescope

Tolerance analysis of off-axis freeform three-mirror KASI-deep rolling imaging fast telescope

Formation Channels of Diffuse Lights in Groups and Clusters over Time

Introducing the Condor array telescope II – deep imaging observations of the edge-on spiral galaxy NGC 5907 and the NGC 5866 Group: yet another view of the iconic stellar stream

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