scholarly journals The stellar mass–size relation for cluster galaxies at z = 1 with high angular resolution from the Gemini/GeMS multiconjugate adaptive optics system

2016 ◽  
Vol 464 (3) ◽  
pp. 2910-2929 ◽  
Author(s):  
Sarah M. Sweet ◽  
Robert Sharp ◽  
Karl Glazebrook ◽  
Francois Rigaut ◽  
Eleazar R. Carrasco ◽  
...  
Keyword(s):  
Adaptive Optics ◽  
Angular Resolution ◽  
Stellar Mass ◽  
High Angular Resolution ◽  
Cluster Galaxies ◽  
Mass Size ◽  
Size Relation ◽  
Adaptive Optics System

PHARO (Palomar high-angular-resolution observer): a dedicated NIR camera for the Palomar adaptive optics system

1997 ◽  
Author(s):  
Bernhard R. Brandl ◽  
Thomas L. Hayward ◽  
James R. Houck ◽  
George E. Gull ◽  
Bruce Pirger ◽  
...  
Keyword(s):  
Adaptive Optics ◽  
Angular Resolution ◽  
High Angular Resolution ◽  
Adaptive Optics System

OPTICAL AND MECHANICAL DESIGN OF THE CHARA ARRAY ADAPTIVE OPTICS

2013 ◽  
Vol 02 (02) ◽  
pp. 1340007 ◽  
Author(s):  
X. CHE ◽  
L. STURMANN ◽  
J. D. MONNIER ◽  
T. A. TEN BRUMMELAAR ◽  
J. STURMANN ◽  
...  
Keyword(s):  
Adaptive Optics ◽  
Near Infrared ◽  
Angular Resolution ◽  
Mechanical Design ◽  
Wavefront Sensor ◽  
High Angular Resolution ◽  
Stellar Systems ◽  
Tilt Correction ◽  
Chara Array ◽  
Adaptive Optics System

The CHARA array is an optical/near infrared interferometer consisting of six 1-meter diameter telescopes with the longest baseline of 331 m. With high angular resolution, the CHARA array provides a unique and powerful way of studying nearby stellar systems. In 2011, the CHARA array was funded by NSF-ATI for an upgrade of adaptive optics systems to all six telescopes to improve the sensitivity by several magnitudes. The initial grant covers Phase I of the adaptive optics system, which includes an on-telescope Wavefront Sensor and fast tip/tilt correction. We are currently seeking funding for Phase II which will add fast deformable mirrors at the telescopes to close the loop. This paper will describe the design of the project, and show simulations of how much improvement the array will gain after the upgrade.

Development of thin-shell adaptive optics for high angular resolution x-ray telescopes

2008 ◽  
Author(s):  
Charlotte Feldman ◽  
Richard Willingale ◽  
Carolyn Atkins ◽  
Hongchang Wang ◽  
Peter Doel ◽  
...  
Keyword(s):  
Adaptive Optics ◽  
Thin Shell ◽  
Angular Resolution ◽  
High Angular Resolution ◽  
X Ray

scholarly journals Probing the circumstellar medium 2.8 Gyr after the big bang: detection of Bowen fluorescence in the Sunburst arc

2020 ◽  
Vol 499 (1) ◽  
pp. L67-L71
Author(s):  
E Vanzella ◽  
M Meneghetti ◽  
A Pastorello ◽  
F Calura ◽  
E Sani ◽  
...  
Keyword(s):  
Adaptive Optics ◽  
Rest Frame ◽  
Angular Resolution ◽  
Big Bang ◽  
High Angular Resolution ◽  
Physical Origin ◽  
Transient Event ◽  
Eta Carinae ◽  
Transient Events ◽  
The Big Bang

ABSTRACT We discovered Bowen emission arising from a strongly lensed (i.e. with magnification factor μ > 20) source hosted in the Sunburst arc at z = 2.37. We claim this source is plausibly a transient stellar object and study the unique ultraviolet lines emerging from it. In particular, narrow (σv ≃ 40 km s−1) ionization lines of Fe fluoresce after being exposed to Ly α (1216 Å) radiation that pumps selectively their atomic levels. Data from VLT/MUSE, X-Shooter, and ESPRESSO observations (the latter placed at the focus of the four UTs) at increasing spectral resolution of R = 2500, 11 400, and 70 000, respectively, confirm such fluorescent lines are present since at least 3.3 yr (≃1 yr rest frame). Additional Fe forbidden lines have been detected, while C and Si doublets probe an electron density ne ≳ 106 cm−3. Similarities with the spectral features observed in the circumstellar Weigelt blobs of Eta Carinae probing the circumstellar dense gas condensations in radiation-rich conditions are observed. We discuss the physical origin of the transient event, which remains unclear. We expect such transient events (including also supernova or impostors) will be easily recognized with ELTs thanks to high angular resolution provided by adaptive optics and large collecting area, especially in modest (μ < 3) magnification regime.

scholarly journals Commission 9: Instruments and Techniques (Instruments et Techniques)

1991 ◽  
Vol 21 (1) ◽  
pp. 41-52
Author(s):  
John Davis
Keyword(s):  
Adaptive Optics ◽  
Optical Fibers ◽  
Angular Resolution ◽  
New Technology ◽  
High Angular Resolution ◽  
Significant Progress ◽  
Very Large Telescope ◽  
Instruments And Techniques ◽  
Telescope Optics ◽  
New Generation

The period covered by this report has seen significant progress in the development of the new generation of telescopes with apertures in the 8 m plus range. The period has encompassed the major construction phase of the 10 m Keck Telescope, witnessed the commissioning of the European Southern Observatory’s (ESO) New Technology Telescope and the approval of funding for the ESO Very Large Telescope (VLT). Significant progress has been achieved in developing the necessary technology for manufacturing and figuring large mirrors. There have been major expansions of activity in the areas of active control of telescope optics and adaptive optics, and in high angular resolution interferometry with several new groups entering both fields. The use of optical fibers, particularly in the area of multiple-object spectroscopy, has continued to grow. Several telescopes can now be operated remotely and the control systems of new telescopes are being designed to facilitate remote operation.

First Light Adaptive Optics Images from the Keck II Telescope: A New Era of High Angular Resolution Imagery

2000 ◽  
Vol 112 (769) ◽  
pp. 315-319 ◽  
Author(s):  
P. Wizinowich ◽  
D. S. Acton ◽  
C. Shelton ◽  
P. Stomski ◽  
J. Gathright ◽  
...  
Keyword(s):  
Adaptive Optics ◽  
Angular Resolution ◽  
High Angular Resolution ◽  
New Era

scholarly journals A High Angular Resolution Survey of Massive Stars in Cygnus OB2: JHK Adaptive Optics Results from the Gemini Near-Infrared Imager

2020 ◽  
Vol 160 (3) ◽  
pp. 115
Author(s):  
S. M. Caballero-Nieves ◽  
D. R. Gies ◽  
E. K. Baines ◽  
A. H. Bouchez ◽  
R. G. Dekany ◽  
...  
Keyword(s):  
Adaptive Optics ◽  
Near Infrared ◽  
Angular Resolution ◽  
Massive Stars ◽  
High Angular Resolution ◽  
Infrared Imager

scholarly journals HST/WFC3 grism observations of z ∼ 1 clusters: evidence for evolution in the mass–size relation of quiescent galaxies from post-starburst galaxies

2020 ◽  
Vol 493 (4) ◽  
pp. 6011-6032 ◽  
Author(s):  
J Matharu ◽  
A Muzzin ◽  
G B Brammer ◽  
R F J van der Burg ◽  
M W Auger ◽  
...  
Keyword(s):  
Rapid Change ◽  
Driving Mechanism ◽  
Cluster Galaxies ◽  
Star Forming ◽  
Large Size ◽  
The Galaxy ◽  
Size Growth ◽  
Mass Size ◽  
Minor Mergers ◽  
Size Relation

ABSTRACT Minor mergers have been proposed as the driving mechanism for the size growth of quiescent galaxies with decreasing redshift. The process whereby large star-forming galaxies quench and join the quiescent population at the large size end has also been suggested as an explanation for this size growth. Given the clear association of quenching with clusters, we explore this mechanism by studying the structural properties of 23 spectroscopically identified recently quenched (or ‘post-starburst’ (PSB)) cluster galaxies at z ∼ 1. Despite clear PSB spectral signatures implying rapid and violent quenching, 87 per cent of these galaxies have symmetric, undisturbed morphologies in the stellar continuum. Remarkably, they follow a mass–size relation lying midway between the star-forming and quiescent field relations, with sizes 0.1 dex smaller than z ∼ 1 star-forming galaxies at log(M*/M⊙) = 10.5. This implies a rapid change in the light profile without directly effecting the stellar distribution, suggesting changes in the mass-to-light ratio gradients across the galaxy are responsible. We develop fading toy models to explore how star-forming galaxies move across the mass–size plane as their stellar populations fade to match those of the PSBs. ‘Outside-in’ fading has the potential to reproduce the contraction in size and increase in bulge-dominance observed between star-forming and PSB cluster galaxies. Since cluster PSBs lie on the large size end of the quiescent mass–size relation, and our previous work shows cluster galaxies are smaller than field galaxies, the sizes of quiescent galaxies must grow both from the quenching of star-forming galaxies and dry minor mergers.

scholarly journals High-angular resolution observations of the Pistol star

2010 ◽  
Vol 6 (S272) ◽  
pp. 616-617
Author(s):  
Christophe Martayan ◽  
Ronny Blomme ◽  
Jean-Baptiste Le Bouquin ◽  
Anthony Merand ◽  
Guillaume Montagnier ◽  
...  
Keyword(s):  
Adaptive Optics ◽  
Angular Resolution ◽  
Massive Stars ◽  
High Angular Resolution ◽  
Near Ir ◽  
First Results ◽  
Formation And Evolution ◽  
Luminous Blue Variable

AbstractFirst results of near-IR adaptive optics (AO)-assisted imaging, interferometry, and spectroscopy of this Luminous Blue Variable (LBV) are presented. They suggest that the Pistol Star is at least double. If the association is physical, it would reinforce questions concerning the importance of multiplicity for the formation and evolution of extremely massive stars.

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