|
|||||
|
|
The Tiny-Scale Atomic Structure: Gas Cloudlets or Scintillation Phenomenon? |
|
| Authors: | S Stanimirović JM Weisberg A Hedden K Devine T Green SB Anderson |
| Institution: | 1. Radio Astronomy Lab, UC Berkeley, 601 Campbell Hall, Berkeley, CA, U.S.A 2. Department of Physics and Astronomy, Carleton College, Northfield, MN, U.S.A 3. Department of Astronomy, California Institute of Technology, MS 18-34, Pasadena, CA, U.S.A |
| Abstract: | 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. |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ | |