The ionization fraction in dense molecular gas. I. Low-mass cores

Astrophysical Journal

Volumn 503, Issue 2 PART I, 1998, Pages 689-699

  Williams, Jonathan P ^a   Bergin, Edwin A ^a   Caselli, Paola ^b   Myers, Philip C ^a   Plume, René ^b  

^a HARVARD SMITHSONIAN CENTER FOR ASTROPHYSICS   (United States)

^b INAF OSSERVATORIO ASTROFISICO DI ARCETRI   (Italy)

Author keywords

Cosmic rays; ISM: Abundances; ISM: Clouds; ISM: Magnetic fields; ISM: Molecules; Stars: Formation

Indexed keywords

EID: 22044456106     PISSN: 0004637X     EISSN: 15384357     Source Type: Journal    
DOI: 10.1086/306034     Document Type: Article

References (60)

1. Arpns, J., & Max, C. E. 1975, ApJ, 196, L77
2. Beichman, C. A., Myers, P. C., Emerson, J. P., Harris, S., Mathieu, R., Benson, P. J., & Jennings, R. E. 1986, ApJ, 307,337
3. Bergin, E. A., & Langer, W. D. 1997, ApJ, 486,316
4. Bergin, E. A., Langer, W. D., & Goldsmith, P. F. 1995, ApJ, 441,222
5. Bergin, E. A., Plume, R., Williams, J. P., & Myers, P. C. 1997, ApJ, submitted (Paper II)
6. Bertsch, D. L., Dame, T. M., Fichtel, C. E., Hunter, S. D., Sreekumar, P., Stacy, J. G., & Thaddeus, P. 1993, ApJ, 416,587
7. Benson, P. J., & Myers, P. C. 1989, ApJS, 71,89
8. Bertoldi, F., & McKee, C. F. 1992, ApJ, 395,140
9. Botschwina, P. 1989, in Ion and Cluster Spectroscopy and Structure, ed. J. P. Maier (New York: Elsevier), 59
10. Butner, H. M., Lada, E. A, & Loren, R. B. 1995, ApJ, 448,207
11. Casanova, S., Montmerle, T., Feigelson, E. D., & André, P. 1995, ApJ, 439, 752
12. Caselli, P., Benson, P. J., & Myers, P. C. 1998a, in preparation
13. Caselli, P., Myers, P. C., & Thaddeus, P. 1995, ApJ, 455, L77
14. Caselli, P., Walmsley, C. M., Terzieva, R., & Herbst, E. 1998b, ApJ, 499, 234
15. naleamo, A., & Lepp, S. 1984, ApJ, 287, L47
16. Je Boisanger, C, Helmich, F. P., & van Dishoeck, E. F. 1996, A& A, 310,
17. nfckman, R. L. 1978, ApJS, 37,407
18. Ftaegreen, B. G. 1979, ApJ, 232,729
19. Goldsmith, P. F., Bergin, E. A., & Lis, D. C. 1997, ApJ, 491,615
20. Goldsmith, P. F., & Langer, W. D. 1978, ApJ, 222,881
21. Goodman, A. A., Barranco, J. A., Wilner, D. J., Ladd, E. F., & Heyer, M. H. 1998, ApJ, in press
22. firaedel, T. E., Langer, W. D., & Frerking, M. A. 1982, ApJS, 48,321
23. Guélin, M., Langer, W. D., Snell, R. L, & Wootten, H. A. 1977, ApJ, 217, L165
24. Guélin, M., Langer, W. D., & Wilson, R. W. 1982, A& A, 107,107
25. Habing, H. J. 1968, Bull. Astron. Inst. Netherlands, 19,421
26. Herbst, E., & Leung, C. M. 1989, ApJS, 69,271
27. Jansen D. J., van Dishoeck, E. F., Keene, J., Boreiko, R. T., & Betz, A. L. 1996, A& A, 309,899
28. Jenkins, E. B. 1987, in Interstellar Processes, ed. D. J. Hollenbach & H. A. Thronson Jr. (Dordrecht: Reidel), 533
29. Joseph, C. L. 1988, ApJ, 335,157
30. Joseph, C. L., Snow, T. P. II, Seab, C. G., & Crutcher, R. M. 1986, ApJ, 309, 771
31. Kutner, M. L., & Ulich, B. L. 1981, ApJ, 250,341
32. Ladd, E. F., & Heyer, M. H. 1996, FCRAO Technical Memorandum
33. Langer, W. D. 1985, in Protostars and Planets II, ed. D. N. Black & M. S. Matthews (Tucson: Univ. Arizona Press), 650
34. Larsson, M., et al. 1996, A& A, 309, L1
35. Le Bourlot, J., Pineau des Forêts, G, Roueff, E., & Schilke, P. 1993, ApJ, 416, L87
36. Linsky, J. L., Diplas, A, Wood, B. E., Brown, A., Ayres, T. R., & Savage, B. D. 1995, ApJ, 451, L335
37. McKee, C. F. 1989, ApJ, 345,782
38. McKee, C. F., Zweibel, E. G., Goodman, A. A., & Heiles, C. 1993, in Protostars and Planets III, ed. E. Levy & J. Lunine (Tucson: Univ. Arizona Press), 327
39. Mestel, L., & Spitzer, L. 1956, MNRAS, 116,503
40. Millar, T. J, Farquhar, P. R. A., & Willacy, K. 1997, A& AS, 121,139
41. Millar, T. J., & Herbst, E. 1990, A& A, 231,466
42. Mouschovias, T. Ch. 1987, in Physical Processes in Interstellar Clouds, ed. G. E. Morfill & M. Scholer (Dordrecht: Reidel), 71
43. _.1991, ApJ, 373,169
44. Myers, P. C., & Goodman, A. A. 1988, ApJ, 326, L27
45. Myers, P. C, & Khersonsky, V. K. 1995, ApJ, 442,186
46. Myers, P. C, Linke, R. A., & Benson, P. J. 1983, ApJ, 264,517
47. Nakano, T. 1984, Fundam. Cosmic Physics, 9,139
48. Neufeld, D. A., Lepp, S., & Melnick, G. J. 1995, ApJS, 100,132
49. Penzias, A. A. 1981, ApJ, 249,518
50. Shu, F. H. 1983, ApJ, 273,202
51. Shu, F. H., Adams, F. C., & Lizano, S. 1987, ARA& A, 25,23
52. Sofia, U. J., Cardelli, J. A., & Savage, B. D. 1994, ApJ, 430,650
53. Stutzki, J., Stacey, G. J., Genzel, R., Harris, A. L, Jaffe, D. T., & Lugten, J.B. 1988, ApJ, 332,379
54. Tielens, A. G. G. M. 1983, A& A, 119,177
55. Ungerechts, H., Bergin, E. A, Goldsmith, P. F., Irvine, W. M., Schloerb, F. P., & Snell, R. L. 1997, ApJ, 482,245
56. Whittet, D. C. B., Adamson, A. J., Duley, W. W., Geballe, T. R, & McFadzean, A. D. 1989, MNRAS, 241,707
57. Whittet, D. C. B., Bode, M. F., Longmore, A. J., Adamson, A. J., McFadzean, A. D., Aitken, D. K., & Roche, P. F. 1988, MNRAS, 233,321
58. Williams, D. A. 1993, in Dust and Chemistry in Astronomy, ed. T. J. Millar & D. A. Williams (Bristol: IPP), 143
59. Wootten, A., Loren, R. B., & Snell, R. L. 1982, ApJ, 255,160
60. Xie, T., Allen, M, & Langer, W. D. 1995, ApJ, 440,674