Development of cross-correlation spectrometry and the coherent structures of maser sources

作者：Takefuji Kazuhiro^*; Imai Hiroshi; Sekido Mamoru

来源：Publications of the Astronomical Society of Japan, 2016, 68(5): 86.

DOI：10.1093/pasj/psw077

• masers
• methods: data analysis
• techniques: interferometric

We have developed a new method of data processing for radio telescope observation data to measure time-dependent temporal coherence, and we have named it "cross-correlation spectrometry" (XCS). XCS is an autocorrelation procedure that expands time lags over the integration time and is applied to data obtained from a single-dish observation. The temporal coherence property of received signals is enhanced by XCS. We tested the XCS technique using the data of strong H2O masers in W3 ( H2O), W49 N, and W75 N. We obtained the temporal coherent lengths of the maser emission to be 17.95 +/- 0.33 mu s, 26.89 +/- 0.49 mu s, and 15.95 +/- 0.46 mu s for W3 (H2O), W49 N, and W75 N, respectively. These results may indicate the existence of a coherent astrophysical maser.

• 出版日期2016-10