2010

H-alpha and Free-Free Emission from the WIM

Dong, Ruobing, Draine, B. T.

Understand

Recent observations have found the ratio of H-alpha to free-free radio continuum to be surprisingly high in the diffuse ionized ISM (the so-called WIM), corresponding to an electron temperature of only ~3000K.

Such low temperatures were unexpected in gas that was presumed to be photoionized.
We consider a 3-component model for the observed diffuse emission, consisting of a mix of (1) photoionized gas, (2) gas that is recombining and cooling, and (3) cool H I gas.
This model can successfully reproduce the observed intensities of free-free continuum, H-alpha, and collisionally-excited lines such as NII 6583.

Built on

Dalgarno, A., & McCray, R. A. 1972, ARA&A, 10, 375
1972
Earlier work this paper cites.
Radhakrishnan, V., Murray, J. D., Lockhart, P., & Whittle, R. P. J. 1972, ApJS, 24, 15
1972
Earlier work this paper cites.
Dickey, J. M., Terzian, Y., & Salpeter, E. E. 1978, ApJS, 36, 77
1978
Earlier work this paper cites.
Draine, B. T. 1978, ApJS, 36, 595
1978
Earlier work this paper cites.
Shull, J. M., & van Steenberg, M. 1982, ApJS, 48, 95
1982
Earlier work this paper cites.
Mathis, J. S., Mezger, P. G., & Panagia, N. 1983, A&A, 128, 212
1983
Earlier work this paper cites.
Webber, W. R., & Yushak, S. M. 1983, ApJ, 275, 391
1983
Earlier work this paper cites.
Reynolds, R. J. 1985, ApJ, 298, L27
1985
Earlier work this paper cites.
Spitzer, Jr., L. 1985, ApJ, 290, L21
1985
Earlier work this paper cites.
Nussbaumer, H., & Storey, P. J. 1986, A&AS, 64, 545
1986
Earlier work this paper cites.
Hummer, D. G. 1988, ApJ, 327, 477
1988
Earlier work this paper cites.
McKee, C. F. 1990, in Astronomical Society of the Pacific Conference Series, Vol. 12, The Evolution of the Interstellar Medium, ed. L. Blitz, 3–29
1990
Earlier work this paper cites.
Rand, R. J., Kulkarni, S. R., & Hester, J. J. 1990, ApJ, 352, L1
1990
Earlier work this paper cites.
Baldwin, J. A., Ferland, G. J., Martin, P. G., Corbin, M. R., Cota, S. A., Peterson, B. M., & Slettebak, A. 1991, ApJ, 374, 580
1991
Earlier work this paper cites.
Black, J. H., & van Dishoeck, E. F. 1991, ApJ, 369, L9
1991
Earlier work this paper cites.
Pequignot, D., Petitjean, P., & Boisson, C. 1991, A&A, 251, 680
1991
Earlier work this paper cites.
Reynolds, R. J. 1991, in IAU Symposium, Vol. 144, The Interstellar Disk-Halo Connection in Galaxies, ed. H. Bloemen, 67–76
1991
Earlier work this paper cites.
Arnaud, M., & Raymond, J. 1992, ApJ, 398, 394
1992
Earlier work this paper cites.
Lepp, S. 1992, in IAU Symp. 150: Astrochemistry of Cosmic Phenomena, 471–475
1992
Earlier work this paper cites.
Reynolds, R. J. 1993, in American Institute of Physics Conference Series, Vol. 278, Back to the Galaxy, ed. S. S. Holt & F. Verter, 156–165
1993
Earlier work this paper cites.
Bakes, E. L. O., & Tielens, A. G. G. M. 1994, ApJ, 427, 822
1994
Earlier work this paper cites.
Verner, D. A., & Yakovlev, D. G. 1995, A&AS, 109, 125
1995
Earlier work this paper cites.
Ferguson, A. M. N., Wyse, R. F. G., Gallagher, III, J. S., & Hunter, D. A. 1996, AJ, 111, 2265
1996
Earlier work this paper cites.

Similar

Hoopes, C. G., Walterbos, R. A. M., & Greenwalt, B. E. 1996, AJ, 112, 1429
1996
Cited alongside, same era.
Pequignot, D. 1996, A&A, 313, 1026
1996
Cited alongside, same era.
Rand, R. J. 1996, ApJ, 462, 712
1996
Cited alongside, same era.
Savage, B. D., & Sembach, K. R. 1996, ARA&A, 34, 279
1996
Cited alongside, same era.
Verner, D. A., & Ferland, G. J. 1996, ApJS, 103, 467
1996
Cited alongside, same era.
Verner, D. A., Ferland, G. J., Korista, K. T., & Yakovlev, D. G. 1996, ApJ, 465, 487
1996
Cited alongside, same era.
Greenawalt, B., Walterbos, R. A. M., & Braun, R. 1997, ApJ, 483, 666
1997
Cited alongside, same era.
—. 1997, ApJ, 474, 129
1997
Cited alongside, same era.
Haffner, L. M., Reynolds, R. J., & Tufte, S. L. 1999, ApJ, 523, 223
1999
Cited alongside, same era.
Hoopes, C. G., Walterbos, R. A. M., & Rand, R. J. 1999, ApJ, 522, 669
1999
Cited alongside, same era.
Stancil, P. C., Schultz, D. R., Kimura, M., Gu, J.-P., Hirsch, G., & Buenker, R. J. 1999, A&AS, 140, 225
1999
Cited alongside, same era.
Tayal, S. S., & Gupta, G. P. 1999, ApJ, 526, 544
1999
Cited alongside, same era.

Then

McCall, B. J., et al. 2003, Nature, 422, 500
2003
Later among the works it cites.
Miller, S. T., & Veilleux, S. 2003, ApJ, 592, 79
2003
Later among the works it cites.
—. 2004, Advances in Space Research, 34, 27
2004
Later among the works it cites.
Barinovs, Ğ., van Hemert, M. C., Krems, R., & Dalgarno, A. 2005, ApJ, 620, 537
2005
Later among the works it cites.
Hudson, C. E., & Bell, K. L. 2005, A&A, 430, 725
2005
Later among the works it cites.
Davies, R. D., Dickinson, C., Banday, A. J., Jaffe, T. R., Górski, K. M., & Davis, R. J. 2006, MNRAS, 370, 1125
2006
Later among the works it cites.
Madsen, G. J., Reynolds, R. J., & Haffner, L. M. 2006, ApJ, 652, 401
2006
Later among the works it cites.
Abrahamsson, E., Krems, R. V., & Dalgarno, A. 2007, ApJ, 654, 1171
2007
Later among the works it cites.
Indriolo, N., Geballe, T. R., Oka, T., & McCall, B. J. 2007, ApJ, 671, 1736
2007
Later among the works it cites.
Ramsbottom, C. A., Hudson, C. E., Norrington, P. H., & Scott, M. P. 2007, A&A, 475, 765
2007
Later among the works it cites.
Tayal, S. S. 2007, ApJS, 171, 331
2007
Later among the works it cites.
Dobler, G., & Finkbeiner, D. P. 2008, ApJ, 680, 1235
2008
Later among the works it cites.
Hill, A. S., Benjamin, R. A., Kowal, G., Reynolds, R. J., Haffner, L. M., & Lazarian, A. 2008, ApJ, 686, 363
2008
Later among the works it cites.
—. 2008, A&A, 486, 629
2008
Later among the works it cites.
Asplund, M., Grevesse, N., Sauval, A. J., & Scott, P. 2009, ARA&A, 47, 481
2009
Later among the works it cites.
Bautista, M. A., Quinet, P., Palmeri, P., Badnell, N. R., Dunn, J., & Arav, N. 2009, A&A, 508, 1527
2009
Later among the works it cites.
Dobler, G., Draine, B., & Finkbeiner, D. P. 2009, ApJ, 699, 1374 (DDF09)
2009
Later among the works it cites.
Haffner, L. M., et al. 2009, Reviews of Modern Physics, 81, 969
2009
Later among the works it cites.
Jenkins, E. B. 2009, ApJ, 700, 1299
2009
Later among the works it cites.
Sofia, U. J., & Parvathi, V. S. 2010, in Cosmic Dust – Near and Far, ed. T. Henning, E. Grün, & J. Steinacker, 236–242
2010
Closest in time.
Tayal, S. S., & Zatsarinny, O. 2010, ApJS, 188, 32
2010
Closest in time.
—. 2011, Physics of the Interstellar and Intergalactic Medium (Princeton, NJ: Princeton University Press)
2011
Closest in time.

Beyond the bibliography

alphaXiv searches the wider corpus for related work and actual follow-ups.

Open on alphaXiv

alphaXiv is searching for related work…

Reading the bibliography…