Adaptive Optics for Astronomy

Davies, R. I.; Kasper, Markus

doi:10.1146/annurev-astro-081811-125447

Cited by 293 publications

(189 citation statements)

References 217 publications

(124 reference statements)

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“…I say, purge the English language of these mongrel wordels!' (M. Colless, 2010, personal communication) Kinematics of High-z Star-Forming Galaxies 3 routine on large telescopes (Davies & Kasper 2012) over the last decade and has allowed the achievement of the angular diffraction limit on 8-10 m telescopes-typically 0.1 arcsec instead of the 0.5-1 arcsec seeing limit imposed by the atmosphere. This is important as 1 arcsec corresponds to 8 kpc for 1 < z < 3 which is comparable to the sizes of disc galaxies at these redshifts (e.g.…”

Section: Background and Scope Of This Reviewmentioning

confidence: 99%

The Dawes Review 1: Kinematic Studies of Star-Forming Galaxies Across Cosmic Time

Glazebrook

2013

Publ. Astron. Soc. Aust.

132

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The last seven years have seen an explosion in the number of Integral Field galaxy surveys, obtaining resolved 2D spectroscopy, especially at high-redshift. These have taken advantage of the mature capabilities of 8-10 m class telescopes and the development of associated technology such as AO. Surveys have leveraged both high spectroscopic resolution enabling internal velocity measurements and high spatial resolution from AO techniques and sites with excellent natural seeing. For the first time, we have been able to glimpse the kinematic state of matter in young, assembling starforming galaxies and learn detailed astrophysical information about the physical processes and compare their kinematic scaling relations with those in the local Universe. Observers have measured disc galaxy rotation, merger signatures, and turbulence-enhanced velocity dispersions of gas-rich discs. Theorists have interpreted kinematic signatures of galaxies in a variety of ways (rotation, merging, outflows, and feedback) and attempted to discuss evolution vs. theoretical models and relate it to the evolution in galaxy morphology. A key point that has emerged from this activity is that substantial fractions of high-redshift galaxies have regular kinematic morphologies despite irregular photometric morphologies and this is likely due to the presence of a large number of highly gas-rich discs. There has not yet been a review of this burgeoning topic. In this first Dawes review, I will discuss the extensive kinematic surveys that have been done and the physical models that have arisen for young galaxies at high-redshift.

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Section: Background and Scope Of This Reviewmentioning

confidence: 99%

The Dawes Review 1: Kinematic Studies of Star-Forming Galaxies Across Cosmic Time

Glazebrook

2013

Publ. Astron. Soc. Aust.

132

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“…As LGS AO systems continue to proliferate (Davies & Kasper 2012), small-to-intermediate-class observatories with…”

Section: Discussionmentioning

confidence: 99%

Laser-only Adaptive Optics Achieves Significant Image Quality Gains Compared to Seeing-limited Observations over the Entire Sky

Howard

Law

Ziegler

et al. 2018

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Adaptive optics laser guide-star systems perform atmospheric correction of stellar wavefronts in two parts: stellar tip-tilt and high-spatial-order laser correction. The requirement of a sufficiently bright guide star in the field-ofview to correct tip-tilt limits sky coverage. In this paper, we show an improvement to effective seeing without the need for nearby bright stars, enabling full sky coverage by performing only laser-assisted wavefront correction. We used Robo-AO, the first robotic AO system, to comprehensively demonstrate this laser-only correction. We analyze observations from four years of efficient robotic operation covering 15000 targets and 42000 observations, each realizing different seeing conditions. Using an autoguider (or a post-processing software equivalent) and the laser to improve effective seeing independent of the brightness of a target, Robo-AO observations show a 39%±19% improvement to effective FWHM, without any tip-tilt correction. We also demonstrate that 50% encircled energy performance without tip-tilt correction remains comparable to diffraction-limited, standard Robo-AO performance. Faint-target science programs primarily limited by 50% encircled energy (e.g., those employing integral field spectrographs placed behind the AO system) may see significant benefits to sky coverage from employing laser-only AO.

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“…AO is now an established technique for improving the spatial resolution of large ground-based telescopes (e.g. Davies & Kasper 2012;Beckers 1993) and offers diffraction-limited images in the near infrared (NIR). Unfortunately, by now there are few efficient AO systems in the visible (see e.g.…”

Section: Introductionmentioning

confidence: 99%

High spatial resolution optical imaging of the multiple T Tauri system LkHα 262/LkHα 263

Velasco

Rebolo

Oscoz

et al. 2016

Mon. Not. R. Astron. Soc.

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We report high spatial resolution i' band imaging of the multiple T Tauri system LkHα 262/LkHα 263 obtained during the first commissioning period of the Adaptive Optics Lucky Imager (AOLI) at the 4.2 m William Herschel Telescope, using its Lucky Imaging mode. AOLI images have provided photometry for each of the two components LkHα 263 A and B (0.41 arcsec separation) and marginal evidence for an unresolved binary or a disc in LkHα 262. The AOLI data combined with previously available and newly obtained optical and infrared imaging show that the three components of LkHα 263 are co-moving, that there is orbital motion in the AB pair, and, remarkably, that LkHα 262-263 is a common proper motion system with less than 1 mas/yr relative motion. We argue that this is a likely five-component gravitationally bounded system. According to BT-settl models the mass of each of the five components is close to 0.4 M and the age is in the range 1-2 Myr. The presence of discs in some of the components offers an interesting opportunity to investigate the formation and evolution of discs in the early stages of multiple very low-mass systems. In particular, we provide tentative evidence that the disc in 263C could be coplanar with the orbit of 263AB.

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Adaptive Optics for Astronomy

Cited by 293 publications

References 217 publications

The Dawes Review 1: Kinematic Studies of Star-Forming Galaxies Across Cosmic Time

The Dawes Review 1: Kinematic Studies of Star-Forming Galaxies Across Cosmic Time

Laser-only Adaptive Optics Achieves Significant Image Quality Gains Compared to Seeing-limited Observations over the Entire Sky

High spatial resolution optical imaging of the multiple T Tauri system LkHα 262/LkHα 263

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