[asac][almanews] ALMA Memo 431 Released

[Stacy Oliver]

ALMA MEMO #431

First Astronomical Fringe of a Test Correlator for the ALMA: Simultaneous 
Achievement of Wideband and High Resolution

Sachiko K. Okumura(NRO,NAO-J),
Satoru Iguchi(NAO-J),
Yoshihiro Chikada(NAO-J),
Munetake Momose(Ibaraki University),
Mahoko Okiura(The University of Tokyo/NRO,NAO-J

2002/08/15

Keywords: 2-nd generatin correlator, spectroscopic observations, Orion-KL

The first astronomical fringe of a test correlator for the  Atacama Large
Millimeter/Submillimeter Array (ALMA) is obtained. The newly-developed
test correlator system consists of two 4096-Msps Analog-to-Digital
Converters (ADCs) and an FX-type correlator that can divide a 2-GHz
correlation signal from one baseline
into 131072 frequency channels. A fringe spectrum that contains 20 line
features as well as continuum emission at $\sim 86.2$ GHz was obtained
by an interferometric observation of the Orion-KL regions
using this test system connected to the Nobeyama Millimeter Array (NMA),
demonstrating that the realization of high frequency resolution over a wide
bandwidth is technically feasible.  The installation of such
a correlator system in the ALMA will greatly enhance its capability of
multi-line imaging.

View a pdf version of ALMA Memo #431.
http://www.alma.nrao.edu/memos/html-memos/alma431/memo431.pdf

Download a postscript version of ALMA Memo #431.
http://www.alma.nrao.edu/memos/html-memos/alma431/memo431.ps


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