KMTNet Nearby Galaxy Survey. I. Optimal Strategy for Low Surface Brightness Imaging with KMTNet

Byun, Woowon; Sheen, Yun-Kyeong; Ho, Luis C.; Lee, Joon Hyeop; Kim, Sang Chul; Jeong, Hyunjin; Park, Byeong-Gon; Seon, Kwang‐Il; Lee, Yongseok; Cha, Sang-Mok; Kim, Minjin

doi:10.3847/1538-3881/aae647

Cited by 8 publications

(11 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Meanwhile, the completeness rate appears to be much sensitive to the galaxy size or central surface brightness for M R −11 mag. This result is mainly due to confusion between small dwarf galaxies and massive background galaxies, and also partly induced by the 3σ surface brightness limit of ∼26.5 mag arcsec −2 in the mosaic image (see Byun et al 2018). The right panel of Figure 3 also shows the average completeness rates against central surface brightness and absolute magnitude.…”

Section: Completenessmentioning

confidence: 94%

“…This strategy enabled us to obtain blank sky regions for dark-sky flat-fielding and also fill in the CCD gaps in the stacked images. The overall description of KMTNet Nearby Galaxy Survey (KNGS) project is also found in Byun et al (2018).…”

Section: Datamentioning

confidence: 99%

“…Although intensive all-sky surveys, such as the Sloan Digital Sky Survey (SDSS; York et al 2000), have made a tremendous contribution to this field, the detection of faint dwarf galaxies is still difficult because of their low surface brightness, which have a value less than 1% of the brightness of the night sky. Li et al (2011); (4) measured by Byun et al (2018).…”

Section: Introductionmentioning

confidence: 99%

“…To obtain the virial radius of NGC 1291, we adopted the conversion equation of r 1/2 ∼ 0.015r 200(Kravtsov 2013). We assumed that the half-mass radius (r 1/2 ) can be replaced with the effective radius (r e ) because of a flat color profile in NGC 1291(Byun et al 2018). …”

mentioning

confidence: 99%

See 3 more Smart Citations

KMTNet Nearby Galaxy Survey II. Searching for Dwarf Galaxies in Deep and Wide-field Images of the NGC 1291 System

Byun

Sheen

Park

et al. 2020

ApJ

Self Cite

View full text Add to dashboard Cite

We present newly discovered dwarf galaxy candidates in deep and wide-field images of NGC 1291 obtained with the Korea Microlensing Telescope Network. We identify 15 dwarf galaxy candidates by visual inspection. Using imaging simulations, we demonstrate that the completeness rate of our detection is greater than 70% for the central surface brightness value of µ 0,R 26 mag arcsec −2 and for magnitudes M R −10 mag. The structural and photometric properties of the dwarf galaxy candidates appear to be broadly consistent with those of ordinary dwarf galaxies in nearby groups and clusters, with µ 0,R ∼ 22.5 to 26.5 mag arcsec −2 and effective radii of 200 pc to 1 kpc. The dwarf galaxy candidates show a concentration towards NGC 1291 and tend to be redder the closer they are to the center, possibly indicating that they are associated with NGC 1291. The dwarf candidates presented in this paper appear to be bluer than those in denser environments, revealing that the quenching of star formation in dwarf galaxies is susceptible to the environment, while the morphology shaping is not.

show abstract

Section: Completenessmentioning

confidence: 94%

Section: Datamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

KMTNet Nearby Galaxy Survey II. Searching for Dwarf Galaxies in Deep and Wide-field Images of the NGC 1291 System

Byun

Sheen

Park

et al. 2020

ApJ

Self Cite

View full text Add to dashboard Cite

show abstract

“…Understanding the formation histories of galaxies is one of the major goals in extragalactic astronomy. Various approaches have been tried to achieve this goal, according to available data sets and more specific purposes: the analysis of star clusters in a galaxy (e.g., Dobbs & Pringle 2010;Forbes et al 2018;Forbes & Remus 2018;Ko et al 2018;Villaume et al 2019;Dolfi et al 2021), photometric profiling of individual galaxies (e.g., Head et al 2015;Kim et al 2015;Herrmann et al 2016;Bouquin et al 2018;Byun et al 2018;Watkins et al 2019;Roman-Oliveira et al 2021), tracing the properties of a bulk of galaxies as a function of cosmic time (e.g., van Dokkum et al 2010;Alberts et al 2016;Fossati et al 2017;Mundy et al 2017;Mowla et al 2019;Chu et al 2021), and so on. Such approaches often rely on statistics, which mainly look for a common history of galaxies in a similar type.…”

Section: Introductionmentioning

confidence: 99%

Age-Divided Mean Stellar Populations from Full Spectrum Fitting as the Simplified Star Formation and Chemical Evolution History of a Galaxy: Methodology and Reliability

Lee¹,

Pak²,

Jeong³

et al. 2023

Preprint

View full text Add to dashboard Cite

We introduce a practical methodology for investigating the star formation and chemical evolution history of a galaxy: age-divided mean stellar populations (ADPs) from full spectrum fitting. In this method, the mass-weighted mean stellar populations and mass fractions ( mass ) of young and old stellar components in a galaxy are separately estimated, which are divided with an age cut (selected to be 10 9.5 yr ≈ 3.2 Gyr in this paper). To examine the statistical reliability of ADPs, we generate 10,000 artificial galaxy spectra, each of which consists of five random simple stellar population components. Using the Penalized PiXel-Fitting (pPXF) package, we conduct full spectrum fitting to the artificial spectra with noise as a function of wavelength, imitating the real noise of Sydney-Australian Astronomical Observatory Multi-object Integral field spectrograph (SAMI) galaxies. As a result, the Δ (= output − input) of age and metallicity appears to significantly depend on not only signal-to-noise ratio (S/N), but also luminosity fractions ( lum ) of young and old components. At given S/N and lum , Δ of young components tends to be larger than Δ of old components; e.g., (Δ[M/H]) ∼ 0.40 versus 0.23 at S/N = 30 and lum = 50 per cent. The age-metallicity degeneracy appears to be insignificant, but Δlog(age/yr) shows an obvious correlation with Δ mass for young stellar components (R ∼ 0.6). The impact of dust attenuation and emission lines appears to be mostly insignificant. We discuss how this methodology can be applied to spectroscopic studies of the formation histories of galaxies, with a few examples of SAMI galaxies.

show abstract

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

Byun¹,

Ko²,

Kim³

et al. 2022

PASP

Self Cite

View full text Add to dashboard Cite

In a ΛCDM universe, most galaxies evolve by mergers and accretions, leaving faint and/or diffuse structures, such as tidal streams and stellar halos. Although these structures are a good indicator of galaxies’ recent mass assembly history, they have the disadvantage of being difficult to observe due to their low surface brightness (LSB). To recover these LSB features by minimizing the photometric uncertainties introduced by the optical system, we developed a new optimized telescope named K-DRIFT pathfinder, adopting a linear astigmatism free-three mirror system. Thanks to the off-axis design, it is expected to avoid the loss and scattering of light on the optical path within the telescope. To assess the performance of this prototype telescope, we investigate the photometric depth and capability to identify LSB features. We find that the surface brightness limit reaches down to μ r,1σ ∼ 28.5 mag arcsec−2 in 10″ × 10″ boxes, enabling us to identify a single stellar stream to the east of NGC 5907. We also examine the characteristics of the point-spread function (PSF) and find that the PSF wing reaches a very low level. Still, however, some internal reflections appear within a radius of ∼6′ from the center of sources. Despite a relatively small aperture (0.3 m) and short integration time (2 hr), this result demonstrates that our telescope is highly efficient in LSB detection.

show abstract

KMTNet Nearby Galaxy Survey. I. Optimal Strategy for Low Surface Brightness Imaging with KMTNet

Cited by 8 publications

References 47 publications

KMTNet Nearby Galaxy Survey II. Searching for Dwarf Galaxies in Deep and Wide-field Images of the NGC 1291 System

KMTNet Nearby Galaxy Survey II. Searching for Dwarf Galaxies in Deep and Wide-field Images of the NGC 1291 System

Age-Divided Mean Stellar Populations from Full Spectrum Fitting as the Simplified Star Formation and Chemical Evolution History of a Galaxy: Methodology and Reliability

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

Contact Info

Product

Resources

About