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S. Stanimirovic (UC Berkeley), J. M. Dickey (University of Minnesota), J. M. Weisberg, A. de la Fuente, K. Devine, A. Hedden (Carleton College)
We have recently detected deep and narrow absorption features against PSR B1849+00 in both OH mainlines using the Arecibo telescope. This is the first successful absorption measurement against any pulsar made in both OH mainlines. The absorption features are produced by tiny-scale molecular structure (< 200 AU in size) along the line of sight. In addition, in the pulse-off spectrum, we see OH absorption against SNR G33.6+0.1 which is only 8 arcmin away from the pulsar and is partially covered by the Arecibo beam. It is intriguing that the absorption features seen against the SNR differ greatly from the tiny-scale features seen in the PSR-only absorption spectra! We investigate two possible explanations for this dramatic difference: (a) the PSR being more distant than the SNR; (b) the effect of clumping of molecular gas on very small spatial scales for the emission/absorption studies.
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Bulletin of the American Astronomical Society, 34, #4
© 2002. The American Astronomical Soceity.