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.

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 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 Unveiling the most luminous Lyman-α emitters in the epoch of reionisation

2019 ◽  
Vol 15 (S352) ◽  
pp. 21-25
Author(s):  
Jorryt Matthee ◽  
David Sobral
Keyword(s):  
Interstellar Medium ◽  
Complex Systems ◽  
Rest Frame ◽  
Big Bang ◽  
Young Stars ◽  
Spatially Resolved ◽  
Luminous Galaxies ◽  
Follow Up Studies ◽  
The Big Bang

AbstractDistant luminous Lyman-α emitters are excellent targets for detailed observations of galaxies in the epoch of reionisation. Spatially resolved observations of these galaxies allow us to simultaneously probe the emission from young stars, partially ionised gas in the interstellar medium and to constrain the properties of the surrounding hydrogen in the circumgalactic medium. We review recent results from (spectroscopic) follow-up studies of the rest-frame UV, Lyman-α and [CII] emission in luminous galaxies observed ∼500 Myr after the Big Bang with ALMA, HST/WFC3 and VLT/X-SHOOTER. These galaxies likely reside in early ionised bubbles and are complex systems, consisting of multiple well separated and resolved components where traces of metals are already present.

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.

scholarly journals Volume uncertainty of (7) Iris shape models from disc-resolved images

2020 ◽  
Vol 499 (3) ◽  
pp. 4545-4560
Author(s):  
G Dudziński ◽  
E Podlewska-Gaca ◽  
P Bartczak ◽  
S Benseguane ◽  
M Ferrais ◽  
...  
Keyword(s):  
Adaptive Optics ◽  
Angular Resolution ◽  
The Body ◽  
High Angular Resolution ◽  
Shape Modelling ◽  
Shape Models ◽  
Uncertainty Calculation ◽  
Substantial Error ◽  
Error Bars ◽  
Inversion Techniques

ABSTRACT High angular resolution disc-resolved images of (7) Iris collected by VLT/SPHERE instrument are allowed for the detailed shape modelling of this large asteroid revealing its surface features. If (7) Iris did not suffer any events catastrophic enough to disrupt the body (which is very likely) by studying its topography, we might get insights into the early Solar system’s collisional history. When it comes to internal structure and composition, thoroughly assessing the volume and density uncertainties is necessary. In this work, we propose a method of uncertainty calculation of asteroid shape models based on light curve and adaptive optics (AO) images. We apply this method on four models of (7) Iris produced from independent Shaping Asteroids using Genetic Evolution and All-Data Asteroid Modelling inversion techniques and multiresolution photoclinometry by deformation. Obtained diameter uncertainties stem from both the observations from which the models were scaled and the models themselves. We show that despite the availability of high-resolution AO images, the volume and density of (7) Iris have substantial error bars that were underestimated in the previous studies.

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

2010 ◽  
Author(s):  
Charlotte Feldman ◽  
Richard Willingale ◽  
Carolyn Atkins ◽  
David Brooks ◽  
Tim Button ◽  
...  
Keyword(s):  
Adaptive Optics ◽  
Thin Shell ◽  
Angular Resolution ◽  
High Angular Resolution ◽  
X Ray
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