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[Fe II] emission lines are prominent in the infrared (IR) and important as diagnostic tools for radiative atomic shocks. We investigate the emission characteristics of [Fe II] lines using a shock code developed by Raymond (1979) with updated atomic parameters. We first review general characteristics of the IR [Fe II] emission lines from shocked gas, and derive their fluxes as a function of shock speed and ambient density. We have compiled available IR [Fe II] line observations of interstellar shocks and compare them to the ratios predicted from our model. The sample includes both young and old supernova remnants in the Galaxy and the Large Magellanic Cloud and several Herbig-Haro objects. We find that the observed ratios of the IR [Fe II] lines generally fall on our grid of shock models, but the ratios of some mid-IR lines, e.g., [Fe II] 35.35 µm/[Fe II] 25.99 µm, [Fe II] 5.340 µm/[Fe II] 25.99 µm, and [Fe II] 5.340 µm/[Fe II] 17.94 µm, are significantly offset from our model grid. We discuss possible explanations and conclude that while uncertainties in the shock modeling and the observations certainly exist, the uncertainty in atomic rates appears to be the major source of discrepancy.
atomic processes;hydrodynamics;infrared;ISM;shock waves;
 Cited by
Allen, M. G., Groves, B. A., Dopita, M. A., Sutherland, R. S., & Kewley, L. J. 2008, The MAPPINGS III Library of Fast Radiative Shock Models, ApJS, 178, 20 crossref(new window)

Arnaud, M., & Raymond, J. 1992, Iron Ionization and Recombination Rates and Ionization Equilibrium, ApJ, 398, 394 crossref(new window)

Asplund, M., Grevesse, N., Sauval, A. J., & Scott, P. 2009, The Chemical Composition of the Sun, ARA&A, 47, 481 crossref(new window)

Bautista, M. A., Fivet, V., Ballance, C., et al. 2015, Atomic Data and Spectral Model for Fe II, ApJ, 808, 174 crossref(new window)

Caulet, A., & Williams, R. M. 2012, Infrared Spectral Mapping of Supernova Remnants. I. N63A and Its Environment, ApJ, 761, 107 crossref(new window)

Cox, D. P., & Raymond, J. C. 1985, Preionization-Dependent Families of Radiative Shock Waves, ApJ, 298, 651 crossref(new window)

Crutcher, R. M., Wandelt, B., Heiles, C., Falgarone, E., & Troland, T. H. 2010, Magnetic Fields in Interstellar Clouds from Zeeman Observations: Inference of Total Field Strengths by Bayesian Analysis, ApJ, 725, 466 crossref(new window)

Deb, N. C., & Hibbert, A. 2010, Calculation of Intensity Ratios of Observed Infrared [Fe II] Lines, ApJL, 711, L104 crossref(new window)

Deb, N. C., & Hibbert, A. 2011, Radiative Transition Rates for the Forbidden Lines in Fe II, A&A, 536, A74 crossref(new window)

Dinerstein, H. 1995, Infrared Emission Lines as Probes of Gaseous Nebulae, The Analysis of Emission Lines: A Meeting in Honor of the 70th Birthdays of D. E. Osterbrock & M. J. Seaton, 134

Dionatos, O., Jørgensen, J. K., Teixeira, P. S., Güdel, M., & Bergin, E. 2014, Atomic Jet from SMM1 (FIRS1) in Serpens Uncovers Protobinary Companion, A&A, 563, A28 crossref(new window)

Dopita, M. A., & Sutherland, R. S. 1995, Spectral Signatures of Fast Shocks. II. Optical Diagnostic Diagrams, ApJ, 455, 468 crossref(new window)

Dopita, M. A., & Sutherland, R. S. 1996, Spectral Signatures of Fast Shocks. I. Low-Density Model Grid, ApJS, 102, 161 crossref(new window)

Draine, B. T. 2011, Physics of the Interstellar and Intergalactic Medium by Bruce T. Draine (Princeton: Princeton University Press)

Gerardy, C. L., & Fesen, R. A. 2001, Near-Infrared Spectroscopy of the Cassiopeia A and Kepler Supernova Remnants, AJ, 121, 2781 crossref(new window)

Giannini, T., Calzoletti, L., Nisini, B., et al. 2008, Near-Infrared, IFU Spectroscopy Unravels the Bow-Shock HH99B, A&A, 481, 123 crossref(new window)

Giannini, T., Antoniucci, S., Nisini, B., et al. 2015, Empirical Determination of Einstein A-Coefficient Ratios of Bright [Fe II] Lines, ApJ, 798, 33 crossref(new window)

Graham, J. R., Wright, G. S., & Longmore, A. J. 1990, Infrared Spectroscopy and Imaging of the Crab Nebula, ApJ, 352, 172 crossref(new window)

Hartigan, P., Raymond, J., & Pierson, R. 2004, Infrared Emission Lines of [Fe II] as Diagnostics of Shocked Gas in Stellar Jets, ApJL, 614, L69 crossref(new window)

Heiles, C., & Troland, T. H. 2005, The Millennium Arecibo 21 Centimeter Absorption-Line Survey. IV. Statistics of Magnetic Field, Column Density, and Turbulence, ApJ, 624, 773 crossref(new window)

Hewitt, J. W., Rho, J., Andersen, M., & Reach, W. T. 2009, Spitzer Observations of Molecular Hydrogen in Interacting Supernova Remnants, ApJ, 694, 1266 crossref(new window)

Hollenbach, D., Chernoff, D. F., & McKee, C. F. 1989, Infrared Diagnostics of Interstellar Shocks, in Proceedings of the 22nd Eslab Symposium, ed. B. H. Kaldeich (ESA SP-290; European Space Agency), 245

Hollenbach, D., & McKee, C. F. 1989, Molecule Formation and Infrared Emission in Fast Interstellar Shocks. III - Results for J Shocks in Molecular Clouds, ApJ, 342, 306 crossref(new window)

Koo, B.-C., & Lee, Y.-H. 2015, Near-Infrared Spectroscopy of Young Galactic Supernova Remnants, PKAS, 30, 145

Koo, B.-C., Lee, Y.-H., Moon, D.-S., Yoon, S.-C., & Raymond, J. C. 2013, Phosphorus in the Young Supernova Remnant Cassiopeia A, Science, 342, 1346 crossref(new window)

Koo, B.-C., Moon, D.-S., Lee, H.-G., Lee, J.-J., & Matthews, K. 2007, [Fe II] and H2 Filaments in the Supernova Remnant G11.2-0.3: Supernova Ejecta and Presupernova Circumstellar Wind, ApJ, 657, 308 crossref(new window)

Landi, E., Young, P. R., Dere, K. P., Del Zanna, G., & Mason, H. E. 2013, CHIANTIAn Atomic Database for Emission Lines. XIII. Soft X-Ray Improvements and Other Changes, ApJ, 763, 86 crossref(new window)

Lee, H.-G., Moon, D.-S., Koo, B.-C., et al. 2013, Wide Integral-Field Infrared Spectroscopy of the Bright [Fe II] Shell in the Young Supernova Remnant G11.2-0.3, ApJ, 770, 143 crossref(new window)

McKee, C. F., Chernoff,D. F., & Hollenbach, D. J. 1984, Infrared Spectroscopy of Interstellar Shocks, in Galactic and Extragalactic Infrared Spectroscopy, eds. M. F. Kessler, J. P. Phillips (Dordrecht: Reidel), 103

Montague, R. G., Diserens, M. J., & Harrison, M. F. A. 1984, A Measurement of the Cross Section for Electron Impact Ionisation of Fe+, J. Phys. B, 17, 2085 crossref(new window)

Mouri, H., Kawara, K., & Taniguchi, Y. 2000, Excitation Mechanism of Near-Infrared [Fe II] Emission in Seyfert and Starburst Galaxies, ApJ, 528, 186 crossref(new window)

Nahar, S. N. 1997, Electron-Ion Recombination of Fe II, Phys. Rev. A, 55, 1980 crossref(new window)

Neufeld, D. A., & Dalgarno, A. 1987, Charge Transfer in Collisions of Doubly Charged Ions of Iron and Nickel with Hydrogen Atoms, Phys. Rev. A, 35, 3142 crossref(new window)

Neufeld, D. A., Hollenbach, D. J., Kaufman, M. J., et al. 2007, Spitzer Spectral Line Mapping of Supernova Remnants. I. Basic Data and Principal Component Analysis, ApJ, 664, 890 crossref(new window)

Neufeld, D. A., Melnick, G. J., Sonnentrucker, P., et al. 2006, Spitzer Observations of HH 54 and HH 7-11: Mapping the H2 Ortho-to-Para Ratio in Shocked Molecular Gas, ApJ, 649, 816 crossref(new window)

Nisini, B. 2008, IR Spectroscopy of Jets: Diagnostics and HAR Observations, Jets from Young Stars II, 742, 79 crossref(new window)

Nisini, B., Caratti o Garatti, A., Giannini, T., & Lorenzetti, D. 2002, 1-2.5 mu m Spectra of Jets from Young Stars: Strong Fe II Smission in HH111, HH240-241 and HH120, A&A, 393, 1035 crossref(new window)

Nussbaumer, H., & Storey, P. J. 1988, Transition Probabilities for Forbidden Fe II Infrared Lines, A&A, 193, 327

Oliva, E., Moorwood, A. F. M., & Danziger, I. J. 1989, Infrared Spectroscopy of Supernova Remnants, A&A, 214, 307

Oliva, E., Moorwood, A. F. M., & Danziger, I. J. 1990, Infrared Spectroscopy of Supernova Remnants. II - A Detailed Study of RCW 103, A&A, 240, 453

Oliva, E., Marconi, A., Maiolino, R., et al. 2001, NICS-TNG Infrared Spectroscopy of NGC 1068: The First Extragalactic Measurement of [P II] and a New Tool to Constrain the Origin of [Fe II] Line Emission in Galaxies, A&A, 369, L5 crossref(new window)

Pradhan, A. K., & Nahar, S. N. 2011, Atomic Astrophysics and Spectroscopy, American Astronomical Society Meeting Abstracts

Quinet, P., Le Dourneuf, M., & Zeippen, C. J. 1996, Atomic Data from the IRON Project. XIX. Radiative Rransition Probabilities for Forbidden Lines in Fe II, A&AS, 120, 361 crossref(new window)

Ramsbottom, C. A., Hudson, C. E., Norrington, P. H., & Scott, M. P. 2007, Electron-Impact Excitation of Fe II. Collision Strengths and Effective Collision Strengths for Low-Lying Fine-Structure Forbidden Transitions, A&A, 475, 765 crossref(new window)

Raymond, J. C. 1979, Shock Waves in the Interstellar Medium, ApJS, 39, 1 crossref(new window)

Raymond, J. C., Ghavamian, P., Williams, B. J., Blair, W. P., Borkowski, K. J., Gaetz, T. J. & Sankrit, R. 2013, Grain Destruction in a Supernova Remnant Shock Wave, ApJ, 778, 161 crossref(new window)

Reilman, R. F., & Manson, S. T. 1979, Photoabsorption Cross Sections for Positive Atomic Ions with Z Equal to or Less than 30, ApJS, 40, 815 crossref(new window)

Rodríguez-Ardila, A., Pastoriza, M. G., Viegas, S., Sigut, T. A. A., & Pradhan, A. K. 2004, Molecular Hydrogen and [Fe II] in Active Galactic Nuclei, A&A, 425, 457 crossref(new window)

Russell, S. C., & Dopita, M. A. 1992, Abundances of the Heavy Elements in the Magellanic Clouds. III - Interpretation of Results, ApJ, 384, 508 crossref(new window)

Sankrit, R., Raymond, J. C., Bautista, M., et al. 2014, Spitzer IRS Observations of the XA Region in the Cygnus Loop Supernova Remnant, ApJ, 787, 3 crossref(new window)

Shull, J. M., & McKee, C. F. 1979, Theoretical Models of Interstellar Shocks. I - Radiative Transfer and UV Precursors, ApJ, 227, 131 crossref(new window)

Slavin, J. D., Dwek, E., & Jones, A. P. 2015, Destruction of Interstellar Dust in Evolving Supernova Remnant Shock Waves, ApJ, 803, 7 crossref(new window)

Smith, N., & Hartigan, P. 2006, Infrared [Fe II] Emission from P Cygni's Nebula: Atomic Data, Mass, Kinematics, and the 1600 AD Outburst, ApJ, 638, 1045 crossref(new window)

Verner, D. A., Ferland, G. J., Korista, K. T., & Yakovlev, D. G. 1996, Atomic Data for Astrophysics. II. New Analytic FITS for Photoionization Cross Sections of Atoms and Ions, ApJ, 465, 487 crossref(new window)

Walmsley, C. M., Natta, A., Oliva, E., & Testi, L. 2000, The Structure of the Orion Bar, A&A, 364, 301

Zhang, H. L., & Pradhan, A. K. 1995, Atomic Data from the Iron Project. VI. Collision Strengths and Rate Coefficients for Fe II, A&A, 293, 953