PSR B1849+00 probes the tiny-scale molecular gas ?

Details PSR B1849+00 probes the tiny-scale molecular gas ? PSR B1849+00 probes the tiny-scale molecular gas ?

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...20111209s&link_type=abstract

American Astronomical Society, 201st AAS Meeting, #112.09; Bulletin of the American Astronomical Society, Vol. 34, p.1280

Astronomy and Astrophysics

Astronomy

Scientific paper

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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