Multi-resolution filtering: an empirical method for isolating faint, extended emission in Dragonfly data and other low resolution images

van Dokkum, Pieter; Lokhorst, Deborah; Danieli, Shany; Li, Jiaxuan; Merritt, Allison; Abraham, Roberto; Gilhuly, Colleen; Greco, Johnny P.

doi:10.48550/arxiv.1910.12867

Cited by 2 publications

(4 citation statements)

References 62 publications

(79 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…One of these (dw1403p5338) is actually in the footprint of the search of Bennet et al (2017) but was missed in that search. It was noted by van Dokkum et al (2019) as a candidate satellite. We used the deep CFHT Legacy Survey imaging to measure its SBF distance which is consistent with M101.…”

Section: Discussionmentioning

confidence: 99%

Radial Distributions of Dwarf Satellite Systems in the Local Volume

Carlsten,

Greene,

Peter

et al. 2020

Preprint

Self Cite

View full text Add to dashboard Cite

The radial spatial distribution of low-mass satellites around a Milky Way (MW)-like host is an important benchmark for simulations of small-scale structure. The distribution is sensitive to the disruption of subhalos by the central disk and can indicate whether the disruption observed in simulations of MW analogs is artificial (i.e., numeric) or physical in origin. We consider a sample of 12 well-surveyed satellite systems of MW-like hosts in the Local Volume that are complete to M V < −9 and within 150 projected kpc. We investigate the radial distribution of satellites and compare with ΛCDM cosmological simulations, including big-box cosmological simulations and high resolution zoom in simulations of MW sized halos. We find that the observed satellites are significantly more centrally concentrated than the simulated systems. Several of the observed hosts, including the MW, are ∼ 2σ outliers relative to the simulated hosts in being too concentrated, while none of the observed hosts are less centrally concentrated than the simulations. This result is robust to different ways of measuring the radial concentration. We find that this discrepancy is more significant for bright, M V < −12 satellites, suggestive that this is not the result of observational incompleteness. We argue that the discrepancy is possibly due to artificial disruption in the simulations, but, if so, this has important ramifications for what stellar to halo mass relation is allowed in the low-mass regime by the observed abundance of satellites.

show abstract

Section: Discussionmentioning

confidence: 99%

Radial Distributions of Dwarf Satellite Systems in the Local Volume

Carlsten,

Greene,

Peter

et al. 2020

Preprint

Self Cite

View full text Add to dashboard Cite

show abstract

“…An implication of the lack of fine structure and steeply declining wide-angle PSF is that it can be modeled well. This is critical for the removal of high surface brightness compact sources, optimizing for an easier detection of faint structures (van Dokkum et al 2019b). Further information and characterization of the Dragonfly PSF will be provided in a pair of future papers (A.…”

Section: Componentsmentioning

confidence: 99%

“…While the point source depth is equivalent to that of a 1 m telescope in 5 seeing, the extended emission depth is excellent. We measure the depth of the image by measuring the surface brightness contrast as described in van Dokkum et al (van Dokkum et al 2019b). Briefly, this method defines the surface brightness limit as the contrast on a particular spatial scale.…”

Section: Achieved Depthmentioning

confidence: 99%

“…The survey data should also benefit many other scientific topics, including the identification of the nearest UDGs, the study of stellar halos, the faint outskirts of massive galaxies, IGL, ICL, etc. A new method, multi-resolution filtering (van Dokkum et al 2019b), was applied to the data, efficiently isolating the faint, extended emission.…”

Section: Examples Of Low Surface Brightness Objectsmentioning

confidence: 99%

See 1 more Smart Citation

The Dragonfly Wide Field Survey. I. Telescope, Survey Design and Data Characterization

Danieli,

Lokhorst,

Zhang

et al. 2019

Preprint

Self Cite

View full text Add to dashboard Cite

We present a description of the Dragonfly Wide Field Survey (DWFS), a deep photometric survey of a wide area of sky. The DWFS covers 330 deg 2 in the equatorial GAMA fields and the Stripe 82 fields in the SDSS g and r bands. It is carried out with the 48-lens Dragonfly Telephoto Array, a telescope that is optimized for the detection of low surface brightness emission. The main goal of the survey is to study the dwarf galaxy population beyond the Local Group. In this paper, we describe the survey design and show early results. We reach 1σ depths of µ g ≈ 31 mag arcsec −2 on arcmin scales, and show that Milky Way satellites such as Sextans, Bootes, and Ursa Major should be detectable out to D 10 Mpc. We also provide an overview of the elements and operation of the 48-lens Dragonfly telescope and a detailed description of its data reduction pipeline. The pipeline is fully automated, with individual frames subjected to a rigorous series of quality tests. The sky subtraction is performed in two stages, ensuring that emission features with spatial scales up to ∼ 0. • 9 × 0. • 6 are preserved. The DWFS provides unparalleled sensitivity to low surface brightness features on arcminute scales.

show abstract

Multi-resolution filtering: an empirical method for isolating faint, extended emission in Dragonfly data and other low resolution images

Cited by 2 publications

References 62 publications

Radial Distributions of Dwarf Satellite Systems in the Local Volume

Radial Distributions of Dwarf Satellite Systems in the Local Volume

The Dragonfly Wide Field Survey. I. Telescope, Survey Design and Data Characterization

Contact Info

Product

Resources

About