Sign on

SAO/NASA ADS Astronomy Abstract Service

· Find Similar Abstracts (with default settings below)
· Also-Read Articles (Reads History)
·
· Translate This Page
Title:
Laser Guide Star Observations of Super Star Clusters in NGC 1569 and AO PSF Estimation in Crowded Fields
Authors:
Sheehy, C. D.; McCrady, N.; Graham, J. R.
Affiliation:
AA(UC Berkeley), AB(UC Berkeley), AC(UC Berkeley)
Publication:
American Astronomical Society Meeting 207, #78.08; Bulletin of the American Astronomical Society, Vol. 37, p.1294
Publication Date:
12/2005
Origin:
AAS
Bibliographic Code:
2005AAS...207.7808S

Abstract

We have used the Keck LGS AO system to image the field of super star clusters A and B in the dwarf starburst galaxy NGC 1569. The observations were obtained in good conditions and the Strehl ratio at H band is ˜ 15%. With this modest Strehl correction, the qualitative impression is that the LGS/AO images are significantly less confused than the HST/NIC2 observations of this field.

We have used a linear systems approach to describe the imaging performance of the atmosphere, AO system and science camera, and develop a semi-emiprical model of the PSF by fitting for the optical transfer function in the Fourier domain. Experiments with simulated data confirm the utility of this approach for crowded fields in cases where traditional algorithms, e.g., STARFINDER, fail. We confirm the integrity of the LGS AO photometry extracted using these PSFs by comparing the Keck data with HST NICMOS F160W data.

Bibtex entry for this abstract   Preferred format for this abstract (see Preferences)
   

Find Similar Abstracts:

Use: Authors
Title
Abstract Text
Return: Query Results Return    items starting with number
Query Form
Database: Astronomy
Physics
arXiv e-prints