Last updated 09/07/24: Online ordering is currently unavailable due to technical issues. We apologise for any delays responding to customers while we resolve this. For further updates please visit our website: https://www.cambridge.org/news-and-insights/technical-incident
We use cookies to distinguish you from other users and to provide you with a better experience on our websites. Close this message to accept cookies or find out how to manage your cookie settings.
Published online by Cambridge University Press: 03 August 2017
The interstellar gas shows wide variations in density and in velocity. Common words to describe the existence of these variations are cloudiness for the density and turbulence for the velocity field. These terms have initially been introduced as vague descriptions and were not based on mathematical analysis or dynamical theory. The word cloud as used by astronomers did not always mean a region of large density with relatively sharp boundaries; nor did the word turbulence necessarily imply a velocity field with well-defined statistical regularities and energy dissipation by means of viscosity.
1 van de Hulst, , Muller, , and Oort, , Bull. Astron. Inst. Neth. 12, 117 (No. 452) (1954).Google Scholar
2 Morgan, , Whitford, , and Code, , Astrophys. J. 118, 318 (1953).CrossRefGoogle Scholar
3 Gum, C. S., Mem. Roy. Astron. Soc. 67, 156 (1955).Google Scholar
4 Kerr, , Hindman, , and Carpenter, , Nature 180, 677 (1957).Google Scholar
5 Thackeray, A. D., Mém. soc. roy. sci. Liège 15, 437 (1955).Google Scholar
6 Westerhout, G., (a) Bull Astron. Inst. Neth. 13, 201 (No. 475) (1957); (b) “Radio astronomy.” I. A. U. Symposium No. 4 (Cambridge University Press, New York, 1957), p. 22.Google Scholar
7 Walraven, , Muller, , and Oosterhoff, , Bull. Astron. Inst. Neth. 14, 81 (No. 484) (1958).Google Scholar
∗ Note added in proof (June, 1958).—Since this was written a map of the spiral structure in the galactic system based on a combined discussion of northern and southern data has been prepared for publication by Oort, Kerr, and Westerhout, Monthly Notices Roy. Astron. Soc. (to be published).Google Scholar
8 Schmidt, M., Bull. Astron. Inst. Neth. 13, 247 (No. 475) (1957).Google Scholar
9 van de Hulst, , Raimond, , and van Woerden, , Bull. Astron. Inst. Neth. 14, 1 (No. 480) (1957).Google Scholar
10 Schmidt, M., Bull. Astron. Inst. Neth. 13, 15 (No. 468) (1956).Google Scholar
11 Schmidt, M., Bull. Astron. Inst. Neth. 14, 17 (No. 480) (1957).Google Scholar
12 Pickelner, S. B., Izvest. Krymsk. Obs. 10, 74 (1953).Google Scholar
13 Spitzer, L., Astrophys. J. 124, 20 (1956).CrossRefGoogle Scholar
14 Pickelner, S. B. and Shklovsky, I. S., Astron. Zhur. 34, 145 (1957).Google Scholar
15 Baldwin, J. E., Monthly Notices Roy. Astron. Soc. 115, 691 (1956); “Radio astronomy,” I. A. U. Symposium No. 4 (Cambridge University Press, New York, 1957), p. 233.Google Scholar
† Note added in proof (June, 1958).—Measurements with a band width of 10 kcps show at the north pole (second field in Fig. 4) a much narrower line with top 22°K, total half-width g km/sec, and wings extending to ±50 km/sec. Any wings at velocities >70 km/sec, if present at all, must be well below 1°K.70+km/sec,+if+present+at+all,+must+be+well+below+1°K.>Google Scholar
16 van Woerden, , Rougoor, , and Oort, , Compt. rend. 244, 1691 (1957).Google Scholar
17 Strömgren, B., “Problems of cosmical aerodynamics,” Central Air Documents Office, Dayton, Ohio, 1951, p. 8.Google Scholar
18 Minkowski, R., “Gas dynamics of cosmic clouds,” I. A. U. Symposium No. 2 (North-Holland Publishing Company, Amsterdam, the Netherlands, 1955), p. 3.Google Scholar
19 Oort, J. H., “Gas dynamics of cosmic clouds,” I. A. U. Symposium No. 2 (North-Holland Publishing Company, Amsterdam, the Netherlands, 1955), p. 20.Google Scholar
20 Adams, W. S., Astrophys. J. 109, 354 (1949).CrossRefGoogle Scholar
21 Munch, G., (a) Publs. Astron. Soc. Pacific 65, 179 (1953); (b) Astrophys. J. 125, 42 (1957).CrossRefGoogle Scholar
22 Blaauw, A., Bull. Astron. Inst. Neth. 11, 459 (No. 436) (1952).Google Scholar
23 Spitzer, L. and Skumanich, A., Astrophys. J. 116, 452 (1952).Google Scholar
24 Hagen, , Lilley, , and McClain, , Astrophys. J. 122, 361 (1955).Google Scholar
25 Muller, C. A., Astrophys. J. 125, 830 (1957).CrossRefGoogle Scholar
26 Kahn, F. D., Mém. soc. roy. sci. Liège 15, 578 (1955).Google Scholar
27 Davies, R. D., Monthly Notices Roy. Astron. Soc. 116, 443 (1956).CrossRefGoogle Scholar
28 Whipple, F. L., Harvard Obs. Monographs No. 7, 109 (1948).Google Scholar
29 Schatzman, E., Ann. astrophys. 13, 367 (1950).Google Scholar
30 Oort, T. H. and van de Hulst, H. C., Bull. Astron. Inst. Neth. 10, 187 (No. 376) (1948).Google Scholar
31 Strömgren, B., Astrophys. J. 108, 242 (1948).Google Scholar
32 ter Haar, D., Z. Astrophys. 32, 251 (1953).Google Scholar
33 Oort, J. H., Bull. Astron. Inst. Neth. 12, 177 (No. 455) (1954).Google Scholar
34 Johnson, H. M., Astrophys. J. 117, 235 (1953).CrossRefGoogle Scholar
35 Shajn, G., Trans. Intern. Astron. Union 9, 504 (1957).Google Scholar
36 Gum, C. S., Observatory 76, 150 (1956).Google Scholar
37 Johnson, H. M., Astrophys. J. 121, 604 (1955).Google Scholar
38 Morgan, , Strömgren, , and Johnson, , Astrophys. J. 121, 611 (1955).CrossRefGoogle Scholar
39 Münch, L., Bol. Tonanzintla y Tacubaya No. 13, 28 (1955).Google Scholar
40 Pottasch, S., Bull. Astron. Soc. Neth. 13, 77 (No. 471) (1956).Google Scholar
41 Strömgren, B., Astrophys. J. 89, 526 (1939).CrossRefGoogle Scholar
42 Shajn, G. A. and Hase, V. F., Astron. Zhur. 30, 135 (1953).Google Scholar
43 Johnson, H. M., Astrophys. J. 124, 90 (1956).Google Scholar
44 Oort, J. H., Monthly Notices Roy. Astron. Soc. 106, 159 (1946).Google Scholar
45 Reference 18, p. 106.Google Scholar
46 Minkowski, R., Revs. Modern Phys. 30, 1048 (1958), this issue.CrossRefGoogle Scholar
47 Pottasch, S., Bull. Astron. Inst. Neth. 14, 29 (No. 482) (1958).Google Scholar
48 Osterbrock, D. E., Astrophys. J. 125, 622 (1957).Google Scholar
49 Poveda, A., Bol. Tonanzintla y Tacubaya No. 15 (1956).Google Scholar
50 Agekian, T. A., Astron. Zhur. 32, 416 (1955).Google Scholar
51 Bok, B. J. and Reilly, E. F., Astrophys. J. 105, 255 (1947).CrossRefGoogle Scholar
52 Bok, B. J., Harvard Obs. Monographs No. 7, Centennial Symposia, 53 (1948).Google Scholar
53 Fleischer, R. and Conti, P. S., Astrophys. J. 61, 4 (1956).Google Scholar
54 Reference 18, p. 18.Google Scholar
55 Thackeray, A. D., Monthly Notices Roy. Astron. Soc. 110, 524 (1950).Google Scholar
You have
Access
