Generation of a near infra-red guide star catalog for thirty-meter telescope observations

Subramanian, Smitha ; Subramaniam, Annapurni ; Simard, Luc ; Gillies, Kim ; Ramaprakash, A. N. ; Anupama, G. C. ; Stalin, C. S. ; Ravindranath, Swara ; Reddy, B. Eswar (2013) Generation of a near infra-red guide star catalog for thirty-meter telescope observations Journal of Astrophysics and Astronomy, 34 (2). pp. 175-192. ISSN 0250-6335

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Official URL: http://www.ias.ac.in/describe/article/joaa/034/02/...

Related URL: http://dx.doi.org/10.1007/s12036-013-9176-6

Abstract

The requirements for the production of a near Infra-Red Guide Star Catalog (IRGSC) for Thirty Meter Telescope (TMT) observations are identified and presented. A methodology to compute the expected J band magnitude of stellar sources from their optical (g, r, i) magnitudes is developed. The computed and observed J magnitudes of sources in three test fields are compared and the methodology developed is found to be satisfactory for the magnitude range, JVega = 16–22 mag. From this analysis, we found that for the production of final TMT IRGSC (with a limiting magnitude of JVega = 22 mag), we need g, r, i bands optical data which go up to iAB ~ 23 mag. Fine tuning of the methodology developed, such as using Spectral Energy Distribution (SED) template fitting for optimal classification of stars in the fainter end, incorporating spectral libraries in the model, to reduce the scatter, and modification of the existing colour–temperature relation to increase the source density are planned for the subsequent phase of this work.

Item Type:Article
Source:Copyright of this article belongs to Indian Academy of Sciences.
Keywords:Stars; Near Infra-red Magnitudes; Adaptive Optics
ID Code:100872
Deposited On:10 Dec 2016 12:18
Last Modified:10 Dec 2016 12:21

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