The Huntsman Telescope

Spitler, Lee R.; Longbottom, Fergus D.; Alvarado-Montes, Jaime A.; Bazkiaei, Amir E.; Caddy, Sarah E.; Gee, Wilfred T.; Horton, Anthony; Lee, Steven; Prole, Daniel J.

doi:10.48550/arxiv.1911.11579

Cited by 5 publications

(5 citation statements)

References 23 publications

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“…For instance, Martínez-Delgado et al (2010) and Javanmardi et al (2016) have respectively discovered streams and LSB systems around spiral galaxies with several small-size telescopes, while the Dragonfly Telephoto Array (van Dokkum et al 2014) produced very deep images of nearby galaxies. The Huntsman telescope (Spitler et al 2019) is based on the same principle as Dragonfly. In addition, LSB studies were conducted using professional telescopes such as the Burrell Schmidt telescope (e.g., Mihos et al 2015), the Canada-France-Hawaii-Telescope (CFHT) (e.g., Ferrarese et al 2012;Duc 2020), the VLT Survey Telescope (VST) (e.g., Venhola et al 2017;Iodice et al 2021), or the Subaru telescope (e.g., Alabi et al 2020;Jackson et al 2021).…”

Section: Introductionmentioning

confidence: 99%

Characterization of low surface brightness structures in annotated deep images

Sola

Duc

Richards

et al. 2022

A&A

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Context. The identification and characterization of low surface brightness (LSB) stellar structures around galaxies such as tidal debris of ongoing or past collisions is essential to constrain models of galactic evolution. So far most efforts have focused on the numerical census of samples of varying sizes, either through visual inspection or more recently with deep learning. Detailed analyses including photometry have been carried out for a small number of objects, essentially because of the lack of convenient tools able to precisely characterize tidal structures around large samples of galaxies. Aims. Our goal is to characterize in detail, and in particular obtain quantitative measurements, of LSB structures identified in deep images of samples consisting of hundreds of galaxies. Methods. We developed an online annotation tool that enables contributors to delineate the shapes of diffuse extended stellar structures with precision, as well as artifacts or foreground structures. All parameters are automatically stored in a database which may be queried to retrieve quantitative measurements. We annotated LSB structures around 352 nearby massive galaxies with deep images obtained with the Canada-France-Hawaii Telescope as part of two large programs: Mass Assembly of early-Type GaLAxies with their fine Structures (MATLAS) and Ultraviolet Near Infrared Optical Northern Survey (UNIONS)/Canada-France Imaging Survey (CFIS). Each LSB structure was delineated and labeled according to its likely nature: stellar shells, streams associated with a disrupted satellite, tails that formed in major mergers, ghost reflections, or cirrus. Results. From our database containing 8441 annotations, the area, size, median surface brightness, and distance to the host of 228 structures were computed. The results confirm the fact that tidal structures defined as streams are thinner than tails, as expected by numerical simulations. In addition, tidal tails appear to exhibit a higher surface brightness than streams (by about 1 mag), which may be related to different survival times for the two types of collisional debris. We did not detect any tidal feature fainter than 27.5 mag arcsec −2 , while the nominal surface brightness limits of our surveys range between 28.3 and 29 mag arcsec −2 , a difference that needs to be taken into account when estimating the sensitivity of future surveys to identify LSB structures. Conclusions. We compiled an annotation database of observed LSB structures around nearby massive galaxies including tidal features that may be used for quantitative analysis and as a training set for machine learning algorithms.

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Section: Introductionmentioning

confidence: 99%

Characterization of low surface brightness structures in annotated deep images

Sola

Duc

Richards

et al. 2022

A&A

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“…There are now several arrays of small, amateur-sized telescopes built seeking to detect low surface brightness features around nearby galaxies with selected broadband filters. These include the Dragonfly Array with 48 cameras (Abraham & van Dokkum 2014;Lanzetta et al 2023), the KiloDegree Survey (Kuijken et al 2019), the Huntsman Telescope (Spitler et al 2019), and the Large Array Survey Telescope (Ben-Ami et al 2023).…”

Section: Wide-field Imaging With Small Telescopesmentioning

confidence: 99%

Deep Optical Emission-line Images of Nine Known and Three New Galactic Supernova Remnants

Fesen,

Drechsler,

Strottner

et al. 2024

ApJS

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Deep optical emission-line images are presented for nine known plus three new Galactic supernova remnants (SNRs), all but one having at least one angular dimension >1°. Wide-field images taken in Hα and [O iii] λ5007 reveal many new and surprising remnant structures including large remnant shock extensions and “breakout” features not seen in published optical or radio data. These images represent over 12,000 individual images totaling more than 1000 hr of exposure time taken over the last 2 yr mainly using small aperture telescopes, which detected fainter nebular line emissions than published emission-line images. During the course of this imaging program, we discovered three new SNRs, namely G107.5-5.1 (the Nereides Nebula), G209.9-8.2, and G210.5+1.3, two of which have diameters >1.°5. In addition to offering greater structural detail on the nine already known SNRs, a key finding of this study is the importance of [O iii] emission-line imaging for mapping the complete shock emissions of Galactic SNRs.

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“…Further work is needed to determine the limit at which the accumulated mass and thus, the perturbations collapse or alter the spacial oscillations in the potential in such a way as to either eject the material or allow the material to migrate into the host galaxy. The use of photometric arrays such as the Dragonfly Telephoto Array (Abraham & van Dokkum 2014) or the Huntsman Eye Telescope (Spitler et al 2019) may afford an opportunity to detect what are expected to be extremely low surface brightness features.…”

Section: Observational Consequencesmentioning

confidence: 99%

Extension of General Relativity with MOND limit predicts novel orbital structure in and around galaxies

Llinares¹

2023

Preprint

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Context. Detailed knowledge of the different classes of stellar orbits that can be accommodated in a given galactic potential is a prerequisite when building self-consistent models using for instance the Schwazschild technique. Furthermore, observational properties of galaxies depend on what these classes of orbits are and on the presence of chaos in the systems. In the realistic case in which the starting point for modeling is not a gravitational potential, but an observed density distribution, we will require a gravitational theory to make the connection between the stars that we see and the movement these stars may be having. The argument can be turned upside down: understanding what orbits may be allowed by each gravitational theory may give us a greater insight on what these theories are and on how we can test them. Aims. Our aim is to understand novel properties of orbits that are predicted by the latest extension of the MOND phenomenology into the relativistic world. Methods. We integrated orbits numerically in a fixed density distribution. The potential required for such integration was obtained also numerically by assuming different gravitational models. Results. Thanks to the presence of a mass term in the field equations, the theory can allocate new classes of orbits that do not exist in Newtonian gravity nor standard MOND. We discuss consequences that these new families of orbits can have in non-linear cosmological structure formation as well as explore a possible alternative model for galactic structure based on them.

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The Huntsman Telescope

Cited by 5 publications

References 23 publications

Characterization of low surface brightness structures in annotated deep images

Characterization of low surface brightness structures in annotated deep images

Deep Optical Emission-line Images of Nine Known and Three New Galactic Supernova Remnants

Extension of General Relativity with MOND limit predicts novel orbital structure in and around galaxies

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