The tiny-scale atomic structure: gas cloudlets or scintillation phenomenon ?

Details The tiny-scale atomic structure: gas cloudlets or scintillation phenomenon ? The tiny-scale atomic structure: gas cloudlets or scintillation phenomenon ?

2003-06-30

arxiv.org/abs/astro-ph/0307002v1

Astronomy and Astrophysics

Astrophysics

To appear in the proceedings of "Magnetic fields and star formation: theory versus observations", held in Madrid, April 21-25

Scientific paper

10.1023/B:ASTR.0000045005.36554.

We present preliminary results from the recent multi-epoch HI absorption measurements toward several pulsars using the Arecibo telescope. We do not find significant variations in optical depth profiles over periods of 4 months and 9 years. The upper limits on the optical depth variations in directions of B0823+26 and B1133+16 are similar on scales of 10--20, 350 and 500 AU. The large number of non detections of the tiny scale atomic structure suggests that the AU-sized structure is not ubiquitous in the interstellar medium.

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