Abstract
This paper challenges some orthodox notions concerning the structure and evolution of star-forming regions, proposing that they arise largely by a dual process in which conceptual models are fashioned after categories which are in great part reflections of observational limitations, and the models are projected onto interpretations of data, an example of hypostatization of categories. Several examples are discussed. The need for internal support of molecular clouds is questioned. It is suggested that the inverse density-size relation often claimed for clouds and accounted for by several theoretical models is an artifact caused by limited dynamic range in column density detectability, selection bias, distance uncertainties, and internal density gradients, and is contradicted by several unbiased surveys. Limited spatial dynamic range (ratio of image size to resolution) in maps of column density structure results in a “Mr. Magoo effect” which tends to accommodate quasi-static evolutionary concepts. Column density structures mapped with a large spatial and column density dynamic range are dominated by irregular, connected, and nested forms on all scales. Contour shapes of both atomic and molecular clouds exhibit self-similar irregularity with a common fractal dimension over a large range in scale. These features and a technique for the quantification of complex structure are illustrated with a densely-sampled column density image of the Taurus region constructed from IRAS data. A comparison with 553 high-accuracy polarization vectors in the region is also given.
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References
Adler, D. S., Lo, K. Y., and Allen, R. J. 1989, paper presented at the Second Wyoming Conference on The Interstellar Medium in External Galaxies, Grnd Teton, July 3–7, 1989.
Allen, R. J. and Goss, W. M. 1977, Astr. Ap. Suppl., 36, 135.
Ambartsumian, V. A. 1944, Dokl. Akad. Nauk. SSSR, 44, 244.
Ball, R. 1986, Ap. J., 307, 453.
Bally, J., Langer, W. D., Stark, A. A., and Wilson, R. W. 1987, Ap. J. (Letters), 312, L45.
Bally, J., Stark, A. A., Wilson, R. W., and Langer, W. D. 1990, in IAU Symposium No. 120, ed. G. Tenorio-Tagle, in press.
Barfield, O. 1965, Saving the Appearances (Middletown: Wesleyan Univ. Press).
Bash, F. N., Green, E., and Peters, W. L., III 1977, Ap. J., 217, 464.
Bazell, D. and Désert, F. X. 1988, Ap. J., 333, 353.
Beech, M. 1987, Ap. Sp. Sci., 133, 193.
Benzi, R., Patarnello, S., and Santangelo, P. 1987, Europhys. Lett., 3, 811.
Bigliari, H. and Diamond, P. H. 1988, Phys. Rev. Lett., 61, 1716.
Blitz, L. 1988, in Millimeter and Submillimetre Astronomy, ed. R. D. Wolstencroft and W. B. Burton, in press.
Bohm, D. 1980, Wholeness and the Implicate Order (London: Ark Paperbacks).
Bosma, A., Goss, W. M., and Allen, R. J. 1981, Astr. Ap. 93, 106.
Brachet, M. E., Meneguzzi, M., and Sulem, P. L. 1986, Phys. Rev. Lett., 57, 683.
Brinks, E. and Bajaja, E. 1986, Astr. Ap., 169, 14.
Carr, J. S. 1987, Ap. J., 323, 170.
Casoli, F., Combes, F., and Gerin, M. 1984, Astr. Ap., 133, 99.
Cernicharo, J. and Bachillar, R. 1984, Astr. Ap. Suppl., 58, 327.
Cernicharo, J. and Guelin, M. 1987, Astr. Ap., 176, 299.
Cernicharo, J., Bachiller, R., and Duvert, G. 1985, Astr. Ap., 149, 273.
Chandrasekhar, S. and Munch, G. 1952, Ap. J., 115, 103.
Chièze, J. P. 1987, Astr. Ap., 171, 225.
Clark, B. G. 1965, Ap. J., 142, 1398.
Crutcher, R. M. 1988, in Molecular Clouds in the Milky Way and External Galaxies, ed. R. L. Dickman, R. L. Snell, and J. S. Young (New York: Springer-Verlag), p. 105.
Dame, T. M., Elmegreen, B. G., Cohen, R. S., and Thaddeus, P. 1986, Ap. J., 305, 892.
de la Reza, R., Torres, C.A.O., Quast, G., Castillo, B. V., and Vieira, G. L. 1989, Ap. J. (Letters), 343, L61.
Deiss, B. M. and Kegel, W. H. 1986, Astr. Ap., 161, 23.
Deuel, E. R. and Burton, W. B. 1989, preprint.
Dickman, R. L. 1985, in Protostars and Planets II, ed. D. C. Black and M. S. Mathews (Tucson: Univ. of Arizona Press), p. 150.
Donn, B. 1958, in Proc. Third Symposium on Cosmical Gas Dynamics, Rev. Mod. Phys., 30, 940.
Duvert, G., Cernicharo, J., and Baudry, A. 1986, Astr. Ap., 164, 349.
Elmegreen, B. G. 1989, Ap. J., 338, 178.
Elmegreen, B. G. and Elmegreen, D. M. 1987, Ap. J., 320, 182.
Emerson, J. 1987, in Star Forming Regions, ed. M. Peimbert and J. Jugaku (Dordrecht: Reidel), p. 19.
Falgarone, E. 1990, in Structure and Dynamics of the Interstellar Medium, IAU Colloquium No. 120, ed. A. Webster, in press.
Falgarone, E. and Perault, M. 1987, in Physical Processes in Interstellar Clouds, ed. G. E. Morfill and M. Scholer (Dordrecht: Reidel), p. 39.
Falgarone, E. and Perault, M. 1988, Astr. Ap., 205, L1.
Falgarone, E. and Phillips, T. G. 1989, in Submillimetre and Millimeter Wave Astronomy, ed. R. D. Wolstencroft and W. B. Burton, in press.
Falgarone, E. and Puget, J. L. 1986, Astr. Ap., 162, 235.
Fleck, R. C. 1988, Ap. J., 328, 299.
Grabelsky, D. A., Cohen, R. S., Bronfman, L., Thaddeus, P., and May, J. 1987, Ap. J., 315, 122.
Guelin, M. and Cernicharo, J. 1988, in Molecular Clouds in the Milky Way and External Galaxies, ed. R. L. Dickman, R. L. Snell, and J. S. Young (New York: Springer-Verlag), p. 81.
Heiles, C. 1974, in IAU Symposium No. 60, Galactic Radio Astronomy, ed. F. J. Kerr and S. C. Simonson III (Dordrecht: Reidel), p. 13.
Heiles, C. 1987a, in Physical Processes in Interstellar Clouds, ed. G. E. Morfill and M. Scholer (Dordrecht: Rediel), p. 429.
Heiles, C. 1987b, Ap. J., 315, 555.
Henriksen, R. N. and Turner, B. E. 1985, Ap.J., 287, 200.
Herbig, G. H. 1977, Ap. J., 214, 747.
Herbig, G. H. and Rao, N. K. 1972, Ap. J., 174, 401.
Heyer, M. H., Snell, R. L., Goldsmith, P. F., and Meyers, P. C. 1987, Ap. J., 321, 370.
Heyer, M. H., Vrba, F. J., Snell, R. L., Schloerb, F. P., Strom, S. E., Goldsmith, R. F., and Strom, K. M. 1987, Ap. J., 312, 855.
Houlahan, P. and Scalo, J. M. 1990, Ap. J. Suppl., in press.
Hsu, J.-C. 1984, unpublished Ph.D. dissertation, University of Texas at Austin.
Hunter, J. H., Sandford, M. T., Whitaker, R. W., and Klein, R. I. 1986, Ap. J., 305, 309.
Jacq, T., Baudry, A. and Walmsley, C. M. 1988, Astr. Ap., 207, 145.
Jarrett, T. H., Dickman, R. L., and Herbst, W. 1989, Ap. J., in press.
Jones, B. F. and Herbig, G. H. 1979, Astr. J., 84, 1872.
Kleiner, S. C. and Dickman, R. L. 1984, Ap. J., 286, 255.
Kleiner, S. C. and Dickman, R. L. 1985, Ap. J., 295, 466.
Lada, C. J., Margulis, M., Sofue, Y., Nakai, N., and Handa, T. 1988, Ap. J., 328, 143.
Langer, W. D., Wilson, R. W., Goldsmith, P. F., and Beichman, C. A. 1989, Ap. J., 337, 739.
Larson, R. B. 1981, M.N.R.A.S., 194, 809.
Lattanzio, J. C., Monaghan, J. J., Pongracie, H., and Schwarz, M. P. 1985, M.N.R.A.S., 215, 125.
Leisewitz, D. 1989, Ap. J., submitted.
Leisewitz, D., Bash, F. N., and Thaddeus, P. 1989, Ap. J. Suppl., 70, 731.
Leung, C. M., Kutner, M. L., and Mead, K. N. 1982, Ap. J., 262, 583.
Lindgren, K. and Nordahl, M. G. 1988, Complex Systems, 2, 409.
Lo, K. Y., Ball, R., Masson, C. R., Phillips, T. G., Scott, S., and Woody, D. P. 1987, Ap. J. (Letters), 317, L63.
Loren, R. B. 1989a, Ap. J., in press.
Loren, R. B. 1989a, Ap. J., in press.
Lucke, P. B. 1978, Astr. Ap., 64, 367.
Maddalena, R. J., Morris, M, Johnston, K. J., and Henkel, C. 1986, Ap. J., 303, 375.
Maloney, P. 1988, Ap. J., 334, 761.
Martin-Pintado, J., Wilson, T. L., Johnston, K. J., and Henkel, C. 1985, Ap. J., 299, 386.
Massi, M., Churchwell, E., and Felli, M. 1988, Astr. Ap., 194, 116.
Mathewson, D. S. 1968, Ap. J. (Letters), 153, L43.
McGee, R. X. and Murray, J. D. 1961, Aust. J. Phys., 14, 260.
McKee, C. F. 1989, Ap. J., 345, 782.
McWilliams, J. C. 1984, J. Fluid Mech., 146, 21.
Mezger, P. G., Chini, R., Kreysa, E., Wink, J. E., and Salter, C. J. 1988, Astr. Ap., 191, 44.
Minkowski, R. 1955, in Gas Dynamics of Cosmic Clouds, IAU Symp. No. 2 (Amsterdam: North Holland Publishing Company), p. 6.
Moneti, A., Pipher, J. L., Helfer, H. L., McMillan, R. S., and Perry, M. L. 1984, Ap. J., 282, 508
Murphy, P. C. and Myers, P. C. 1985, Ap. J., 298, 818.
Myers, P. C. 1983, Ap. J., 270, 105.
Myers, P. C. 1988, in Galactic and Extragalactic Star Formation, ed. R. Pudritz and M. Fich, p. 331.
Myers, P. C. 1990, in Molecular Astrophysics, ed. T. W. Hartquist (Cambridge Univ. Press), in press.
Myers, P. C. and Goodman, A. A. 1988, Ap. J., 329, 392.
Myers, P. C., Dame, T. M., Thaddeus, P., Cohen, R. S., Silverberg, R. F., Dwek, E., and Hauser, M. G. 1986, Ap. J., 301, 398.
Nercessian, E., Castets, A., Cernicharo, J., and Benayoun, J. J. 1988, Astr. Ap., 189, 207.
Oort, J. 1974, in IAU Symposium 60, Galactic Radio Astronomy, ed. F. J. Kerr and S. C. Simonson DI (Dordrecht: Reidei), p. 43.
Passot, T., Pouquet, A., and Woodward, P. 1988, Astr. Ap., 197, 228.
Peckham, M. 1967, Man’s Rage for Chaos: Biology, Behavior, and the Arts (New York: Schocken Books).
Perry, C. L. and Johnston, L. 1982, Ap. J. Suppl., 50, 451.
Rossano, G. S. 1978, Astr. J., 83, 241.
Rots, A. H. and Shane, W. W. 1975, Astr. Ap., 45, 25.
Rozyczka, M. Tscharnuter, W. M., and Yorke, H. W. 1980, Astr. Ap., 81, 347.
Rydgren, A. E., Schmelz, J. T., Zak, D. S., and Vrba, F. J. 1984, Publ. U. S. Naval Obs., Vol. XXV, Part I.
Santangelo, P., Benzi, R., and Legras, B. 1989, Phys. Fluids A., 1, 1027.
Scalo, J. M. 1985, in Protostars and Planets II, ed. D. C. Black and M. S. Mathews (Tucson: Univ. of Arizona Press), p. 201.
Scalo, J. M. 1988, in Molecular Clouds in the Milky Way and External Galaxies, ed. R. L. Dickman, R. L. Snell, and J. S. Young (New York: Springer-Verlag), p. 201.
Scheffler, H. 1967, Zeit. f. Ap., 65, 60.
Serafine, M. L. 1988, Music as Cognition (New York: Columbia University Press).
Silk, J. 1985, Ap. J. (Letters), 292, L71.
Solomon, P. M., Rivolo, A. R., Barrett, J., and Yahil, A. 1987, Ap. J., 319, 730.
Spitzer, L. 1968, Physical Processes in the Interstellar Medium
Spitzer, L. 1968a, in Stars and Stellar Systems VII: Nebulae and Interstellar Matter, ed. B. M. Middlehurst and L. H. Aller (Chicago: Univ. Chicago Press), p. 1.
Spitzer, L. 1968b, Diffuse Matter in Space, Interscience Publishers.
Sreenivasan, K. R. and Meneveau, C. 1986, J. Fluid Mech., 173, 386.
Stacy, J. G., Myers, P. C., and de Vries, H. W. 1989, in The Physics and Chemistry of Interstellar Molecular Clouds, ed. G. Winnewisser and J. T. Armstrong (New York: Springer-Verlag), in press.
Tohline, J. E., Bodenheimer, P. H., and Christodoulou, D. M. 1987, Ap. J., 322, 787.
Tomisaka, K., Ikeuchi, S., and Nakamura, T. 1988, Ap. J., 335, 239.
Ungerechts, H. and Thaddeus, P. 1987, Ap. J. Suppl. 63, 645.
Unwin, S. C. 1980a, M.N.R.A.S., 190, 551.
Unwin, S. C. 1980b, M.N.R.A.S., 192, 253.
van Albada, G. D. 1980, Astr. Ap., 90, 123.
Verschuur, G. L. 1974a, Ap. J. Suppl., 27, 65.
Verschuur, G. L. 1974b, Ap. J. Suppl., 27, 283.
Vogel, S. N., Boulanger, F., and Ball, R. 1987, Ap. J. (Letters), 321, L145.
Vrba, F. J., Strom, S. E., and Strom, K. M. 1988, Astr. J., 96, 680.
Weiland, J. L., Blitz, L. Dwek, E., Hauser, M. G., Magnani, L., and Rickard, L. J. 1986, Ap. J. (Letters), 306, L101.
Wouterloot, J.G.A. and Habing, H. J. 1985, Astr. Ap. Suppl., 60, 43.
Wright, M.C.H., Warner, P. J., and Baldwin, J. E. 1972, M.N.R.A.S., 155, 337.
Zhou, S., Wu, Y., Evans, N. J., Fuller, G. A., and Myers, P. C. 1989, Ap. J., 346, 168.
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Scalo, J. (1990). Perception of Interstellar Structure: Facing Complexity. In: Capuzzo-Dolcetta, R., Chiosi, C., di Fazio, A. (eds) Physical Processes in Fragmentation and Star Formation. Astrophysics and Space Science Library, vol 162. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-0605-1_12
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