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|Title: ||Potential Sites in Changthang Ladakh for Submillimeter Astronomy|
|Authors: ||Prabhu, T.|
|Issue Date: ||2004 |
|Publisher: ||Physical Research Laboratory|
|Citation: ||International Conference on submillimeter science and technology, 2004, p13|
|Abstract: ||The attenuation by atmospheric water vapor and
other constituents makes it difficult to observe celestial sources
in the submillimeter waveband using ground-based telescopes.
High-altitude, cold, dry sites provide significant reduction in the.
attenuation. Observatories at the summit of Mauna Kea in Hawaii
islands, and higher sites in Chilean Andes have proved these
advantages, and additional sites are being characterized in Dome
C (Antarctica), Ladakb (India), Tibet and Xinjiang (China).
The Indian Institute of Astrophysics (IIA), Bangalore, has set up
Indian Astronomical Observatory (IAO) at Hanle (latitude:
32O 46'46" N; longitude: 7g057'51 " E; 4500 mabove md), in Changthang
Ladakh, initially with the 2-m aperture opticalinfrared Himalayan
Chandra Telescope (HCT). The telescope operates as a National Facility
and is operated remotely from Bangalore using a dedicated satellitebased
communication link. The observatory has provided infrastructural
support for the development of further national and international
facilities for research in astronomy and astrophysics, geodynamics and
geornagnetics, as also atmospheric studies.
Characterization of Hanle and nearby higher altitude regions
for submillimeter and far-infared astronomy is being carried out
by IIA in collaboration with the Raman Research Institute (RRI),
Bangalore, the University of Tokyo and the Harvard-Smithsonian
Center for Astrophysics, Cambridge, MA, USA. A 220 G Hz
radiometer has been operating at Hanle for over 3 years and the
results show that the site is at least as good as Mauna Kea. Some
infrastructure is developed at Polakongka La (5000 m above msl).
Higher peaks are available near both these locations.
We present here information on the geographical locations of
our sites in Ladakh, site characterization experiments in progress,
and results on weather parameters, atmospheric water vapor and
220 GHz opacities.|
|Description: ||Restricted Access. Conference organised by Submillimeter Wave Group, Physical Research Laboratory, Ahmedabad, during 13-15 Oct. 2004.|
|Copyright: ||2004 Physical Research Laboratory, Ahmedabad.|
|Appears in Collections:||Research Papers (A&A)|
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