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Observations of Absorption Lines from Highly Ionized Atoms

Published online by Cambridge University Press:  12 April 2016

Edward B. Jenkins
Edward B. Jenkins*
Affiliation:
Princeton University Observatory, Princeton, N. J. 08544

Abstract

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In the ultraviolet spectra of hot stars, we can see absorption lines from highly ionized species in the interstellar medium. Observations of these features have been very influential in revising our perception of the medium's various physical states and how gases in space are heated and ionized. The pervasiveness of 0 VI absorption lines, coupled with complementary observations of a diffuse background in soft x-rays and EUV radiation, shows that there is an extensive network of low density gas (n ≈ fewx10-3cm-3) existing at “coronal” temperatures, 5.3 ≲ log T ≲ 6.3. Thus, while we once thought that x-rays and cosmic rays were the dominant sources of excitation and heating of the interstellar gas, we now realize that shocks created by supernova explosions or mass loss from early-type stars can propagate freely through space and eventually transfer a large amount of energy to the medium. To create the coronal temperatures, the shocks must have velocities in excess of 150 km s-1; shocks at somewhat lower velocity (v ≲ 100 km s-1) can be directly observed in the lines of Si III. Observations of other lines in the ultraviolet, such as Si IV and C IV, may highlight the widespread presence of energetic uv radiation from very hot, dwarf stars. More advanced techniques in visible and x-ray astronomical spectroscopy may open up for inspection selected lines from atoms in much higher stages of ionization.

Type
Hot Gas in the LISM: Optical, UV, and EUV Wavelengths
Information
International Astronomical Union Colloquium , Volume 81: Local Interstellar Medium , 1984 , pp. 153 - 168
Copyright
Copyright © NASA 1984

References

Arnaud, M. and Rothenflug, R. 1984, preprint.Google Scholar
Black, J. H. and Dalgarno, A. 1973, Ap. J. (Letters), 184, L101.Google Scholar
Black, J. H., Dupree, A. K., Hartmann, L. W. and Raymond, J. C. 1980, Ap. J., 239, 502.CrossRefGoogle Scholar
Blint, R. J., Watson, W. D., and Christensen, R. B. 1976, Ap. J., 205, 634.Google Scholar
Bottema, M., Cushman, G. W., Holmes, A. W., and Ebbets, D. 1984, Proc. SPIE Conf. “Instrumentation in Astronomy V”, in press.Google Scholar
Brandt, J. C. and the HRS Investigation Definition and Experiment Development Teams 1983, in The Space Telescope Observatory, Hall, D.N.B. ed., NASA CP– 2244, p. 76.Google Scholar
Brown, A., Jordan, C, Miliar, T. J., Gondhalekar, P., and Wilson, R. 1981, Nature, 290, 34.Google Scholar
Bruhweiler, F. C. 1982, in Advances in Ultraviolet Astronomy: Four Years of IUE Research, Kondo, Y. Mead, J. M., and Chapman, R. D., eds., NASA Conf. Pub. 2238, p. 125.Google Scholar
Bruhweiler, F. C. and Dean, C. A. 1983, Ap. J. (Letters), 274, L87.Google Scholar
Bruhweiler, F. C. and Kondo, Y. 1981, Ap. J. (Letters), 248, L123. 1982, Ap. J., 259, 232.Google Scholar
Bruhweiler, F. C. Kondo, Y., and McCluskey, G. E. 1979, Ap. J. (Letters), 229, L39. 1980, Ap. J., 237, 19.Google Scholar
Burstein, P., Borken, R. J., Kraushaar, W. L., and Sanders, W. T. 1977, Ap. J., 213, 405.Google Scholar
Castor, J., McCray, R., and Weaver, R. 1975, Ap. J. (Letters), 200, L107.Google Scholar
Chevalier, R. A. and Oegerle, W. R. 1979, Ap. J., 227, 398.Google Scholar
Christensen, R. B., Watson, W. D., and Blint, R. J. 1977, Ap. J., 213, 712.Google Scholar
Cohn, H. and York, D. G. 1977, Ap. J., 216, 408.Google Scholar
Cowie, L. L., Jenkins, E. B., Songaila, A., and York, D. G. 1979, Ap. J., 232, 467.Google Scholar
Cowie, L. L., Taylor, W., and York, D. G. 1981. Ap. J., 248, 528.Google Scholar
Cowie, L. L. and York, D. G. 1978a, Ap. J., 220, 129. 1978b, Ap. J., 223, 876.Google Scholar
Cox, D. P. 1981, Ap. J., 245, 534.Google Scholar
Coxr, D. P. and Anderson, P. R. 1982, Ap. J., 253, 268.Google Scholar
Cox, D. P. and Smith, B. W. 1974, Ap. J. (Letters), 189, L105.Google Scholar
Dalaudier, F., Bertaux, J. L., Kurt, V. G., and Mironova, E.N. 1983, Astr. Ap., in press.Google Scholar
Dalgarno, A. and McCray, R. A. 1972, Ann. Rev. Astr. Ap., 10, 375.Google Scholar
de Korte, P. A. J., Bleeker, J. A. M., Deerenberg, A. J. M., Hayakawa, S., Yamashita, K., and Tanaka, Y. 1976, Astr. Ap., 48, 235.Google Scholar
Duley, W. W. and Williams, D. A. 1980, Ap. J. (Letters), 242, L179.Google Scholar
Dupree, A. K. and Raymond, J. C. 1983, Ap. J. (Letters), 275, L71.Google Scholar
Feldman, P. D., Brune, W. H., and Henry, R. C. 1981, Ap. J. (Letters), 249, L51.Google Scholar
Field, G.B., Goldsmith, D. W., and Habing, H. J. 1969, Ap.J. (Letters), 155, L149.CrossRefGoogle Scholar
Fried, P. M., Nousek, J.A., Sanders, W. T., and Kraushaar, W. L. 1980, Ap. J., 242, 987.Google Scholar
Goldsmith, D. W., Habing, H. J., and Field, G. B. 1969, Ap. J., 158, 173.Google Scholar
Hartmann, J. 1904, Ap. J., 19, 268.Google Scholar
Hayakawa, S. 1979, in X-Ray Astronomy (COSPAR Symposium), Baity, W.A. and Peterson, L.E., eds. (Oxford: Pergammon), p.323.Google Scholar
Hayakawa, S., Kato, T., Nagase, F., Yamashita, K., and Tanaka, Y. 1978, Astr. Ap., 62, 21.Google Scholar
Hills, J.G. 1972, Astr.Ap., 17, 155.Google Scholar
Hills, J.G. 1973, Astr. Ap., 26, 197.Google Scholar
Hills, J.G. 1974, Ap. J., 190, 109.Google Scholar
Hobbs, L.M. 1984, Ap. J., 280, 132.Google Scholar
Hobbs, L.M. and Albert, C.E. 1984, Ap. J., in press.Google Scholar
Jenkins, E.B. 1978a, Ap. J., 219, 845.CrossRefGoogle Scholar
Jenkins, E.B. 1978b, Ap. J., 220, 107.Google Scholar
Jenkins, E.B. 1978c, Comments Astr., 7, 121.Google Scholar
Jenkins, E.B. 1981, in The Universe at Ultraviolet Wavelengths, Chapman, R.D., ed., NASA Conf. Pub. 2171, p. 541. Google Scholar
Jenkins, E.B. and Meloy, D.A. 1974, Ap. J. (Letters), 193, L121. Google Scholar
Jenkins, E.B., Silk, J., and Wallerstein, G. 1976, Ap. J. (Suppl)., 32, 681. Google Scholar
Jenkins, E.B., Wallerstein, G., and Sük, J. 1984, Ap. J., 278, 649. Google Scholar
Jura, M. 1974, Ap. J., 191, 375.Google Scholar
Kraushaar, W.L. 1979, in X-Ray Astronomy (COSPAR Symposium), Baity, W.A. and Peterson, L.E., eds. (Oxford: Pergammon), p. 293. Google Scholar
Laurent, C., Paul, J.A., and Pettini, M. 1982, Ap. J., 260, 163.Google Scholar
Malina, R.F., Basri, G., and Bowyer, S. 1981, Bull. AAS, 13, 873.Google Scholar
McCammon, D., Burrows, D.N., Sanders, W.T., and Kraushaar, W.L. 1983, Ap. J., 269, 107.Google Scholar
McKee, C.F. and Ostriker, J.P. 1977, Ap. J., 218, 148. Google Scholar
O’Donnell, E.J. and Watson, W.D. 1974, Ap. J., 191, 89.CrossRefGoogle Scholar
Paresce, F. 1984, AJ., in press.Google Scholar
Paresce, F.,Monsignori Fossi, B.C., and Landini, M. 1983, Ap. J. (Letters), 266, L107.Google Scholar
Paresce, F. and Stern, R. 1981, Ap. J., 247, 89.Google Scholar
Pettini, M. and West, K.A. 1982, Ap. J., 260, 561.Google Scholar
Phillips, A.P. and Gondhalekar, P.M. 1981, MNRAS, 196, 533.CrossRefGoogle Scholar
Pikel’ner, S.B. 1967, Astr. Zh, 44, 915 (English trans.: Soviet Astron. A J, 11, 737 [1968]).Google Scholar
Rocchia, R., Arnaud, M., Blondel, C., Cheron, C., Christy, J.C., Rothenflug, R., Schnopper, H.W., and Delvaille, J.P. 1984, Astr. Ap., 130, 53.Google Scholar
Rogerson, J.B., York, D.G., Drake, J.F., Jenkins, E.B., Morton, D.C., and Spitzer, L. 1973, Ap. J. (Letters), 181, L110.Google Scholar
Sanders, W.T., Kraushaar, W.L., Nousek, J.A., and Fried, P.M. 1977, Ap. J. (Letters), 217, L87.Google Scholar
Sarazin, C.L. 1977 Ap. J., 211, 772.Google Scholar
Savage, B.D. and deBoer, K.S. 1979, Ap. J. (Letters), 230, L77.Google Scholar
Savage, B.D. and deBoer, K.S. 1981, Ap. J., 243, 460.Google Scholar
Shapiro, P.R. and Field, G.B. 1976, Ap. J., 205, 762. Google Scholar
Shapiro, P.R. and Moore, R.T. 1976, Ap. J., 207, 460.Google Scholar
Shull, J.M. 1977, Ap. J., 216, 414.Google Scholar
ShuU, J.M. and McKee, C.F. 1979, Ap. J., 227, 131.Google Scholar
Shull, J.M. and Van Steenberg, M. 1982, Ap. J. (Suppl.), 48, 95.Google Scholar
Silk, J. 1970, Ap. Letters, 5, 283.Google Scholar
Silk, J. and Brown, R.L. 1971, Ap. J., 163, 495.Google Scholar
Silk, J. and Werner, M.W. 1969, Ap. J., 158, 185.Google Scholar
Sion, E.M. and Guinan, E.F. 1983, Ap. J. (Letters), 265, L87.Google Scholar
Slipher, V.M. 1909, Lowell Obs. Bull., no. 51.Google Scholar
Smith, B.W. 1977, AP. J., 211, 404.Google Scholar
Smith, L.J., Willis, A.J., and Wilson, R. 1980, MNRAS, 191, 339. Google Scholar
Spitzer, L. 1956, Ap. J., 124, 20.Google Scholar
Spitzer, L. 1968, Diffuse Matter in Space, (New York: Wiley Interscience).Google Scholar
Spitzer, L. and Scott, E.H., 1969, Ap. J., 158, 161.Google Scholar
Spitzer, L. and Tomasko, M.G., 1968, Ap. J., 152, 971. Google Scholar
Steigman, G. 1975, Ap. J., 199, 642.CrossRefGoogle Scholar
Tanaka, Y. and Bleeker, J.A.M. 1977, Space Sci. Rev., 20, 815.Google Scholar
Watson, W.D., and Christensen, R.B. 1979, Ap. J., 231, 627.Google Scholar
Weaver, R., McCray, R., Castor, J., Shapiro, P., and Moore, R. 1977, Ap. J., 218, 377.Google Scholar
Weisheit, J.C. 1973, Ap. J., 185, 877.Google Scholar
Weller, C.S. and Meier, R.R. 1981, Ap. J., 246, 386.Google Scholar
Williamson, F.O., Sanders, W.T., Kraushaar, W.L., MeCammon, D., Borken, R., and Bunner, A.N. 1974, Ap. J. (Letters), 193, L133.Google Scholar
York, D.G. 1974, Ap. J. (Letters), 193, L127.Google Scholar
York, D.G. 1977, Ap. J., 213, 43.Google Scholar
York, D.G. and Cowie, L.L. 1983, Ap. J., 264, 49.Google Scholar
York, D.G., Wu, C.C., Ratcliff, S., Blades, J.C., Cowie, L.L., and Morton, D.C. 1983, Ap. J., 274, 136.Google Scholar