赤外線分光から探る星間ガス中のケイ素および鉄の欠乏
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(50) i! LMjk[ i lN&i,#mn19) op qr KLM%st. ῎῍ῑῌ 1) Trumpler R. J., 1930, PASP 42, 214 2) Cartledge S. I. B., et al., 2006, ApJ 641, 327 3) Jones A. P., 2000, Journal of Geophysical Research 105, 10257 4) Sofia U. J., et al., 1994, ApJ 430, 650 5) Fitzpatrick E. L., 1996, ApJ 473, L55 6) Okada Y., et al., 2003, A&A 412, 199 7) Okada Y., et al., 2006, ApJ 640, 383 8) Savage B. D., Sembach K. R., 1996, ARA&A 34, 279 9) Tielens A. G. G. M., Hollenbach D., 1985, ApJ 291, 722 10) Haas M. R., et al., 1991, ApJ 374, 555 11) Mizutani M., et al., 2004, A&A, 423, 579 12) Stolovy S. R., et al., 1995, ASP Conf. 73, 469 13) Colgan S. W. J., et al., 1993, ApJ 413, 237 14) Fuente A., et al., 2000, A&A 354, 1053 15) Rosenthal D., et al., 2000, A&A 356, 705 16) Young Owl, R. C., et al., 2002, ApJ 578, 885 17) Walmsley C. M., et al., 1999, A&A 342, 542 18) Klotz A., et al., 1995, A&A, 304, 520 19) Zubko V., et al., 2004, ApJS 152, 211. u[vwx y0!z$&%{%{ |} ~[v[h i^ mEc LM 2 %N%
(51) ab%#9. ῐ. ῏. !x& . ! ,& #9 #. '!_8$%( ) (! ¡¢. * %wN #. +£¤¥¦ i%wN# §,
(52) ¨©%# ªn# ,\«¬-! ® 1 ¯M %wN %¤n°± , #9 ²³! qr)´.b w81µ/ ,¶·¸¹!º°± % #9. 0 100 ». 03¼. Yoko OKADA Department of Infrared Astrophysics, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 3ῌ1ῌ1 Yoshinodai, Sagamihara, Kanagawa 229ῌ8510, Japan. !9. " "# $ w81 %. Interstellar Depletion of Silicon and Iron Probed by Infrared Spectroscopy. Abstract : We present a study on chemical compositions of interstellar dusts probed by observations of emission lines of silicon and iron ions with two infrared astronomical satellites, the Infrared Space Observatory and the Spitzer Space Telescope. We found that an abundance of gas-phase silicon abundance in the observed Galactic star-forming regions is much larger than that in the cool interstellar medium. This fact indicates the observational evidence of Si-bearing dust destruction. On the other hand, the abundance of the gas-phase iron does not exceed than that in the cool interstellar medium as silicon does. We discuss the chemical compositions of the dust on the basis of the these results.. 129.
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