Astrophysics and Space Science

, Volume 350, Issue 2, pp 741–754 | Cite as

Spaxel analysis: probing the physics of star formation in ultraluminous infrared galaxies

  • Michael A. Dopita
  • Jeffrey Rich
  • Frédéric P. A. Vogt
  • Lisa J. Kewley
  • I-Ting Ho
  • Hassan M. Basurah
  • Alaa Ali
  • Morsi A. Amer
Original Article

Abstract

This paper presents a detailed spectral pixel (spaxel) analysis of the ten Luminous Infrared Galaxies (LIRGs) previously observed with the Wide Field Spectrograph (WiFeS), an integral field spectrograph mounted on the ANU 2.3 m telescope, and for which an abundance gradient analysis has already been presented by Rich et al. (Astrophys. J., 753:5, 2012). Here we use the strong emission line analysis techniques developed by Dopita et al. (Astrophys. J. Suppl. Ser., accepted, 2013) to measure the ionisation parameter and the oxygen abundance in each spaxel. In addition, we use the observed Hα flux to determine the surface rate of star formation (\(\mathrm {M}_{\odot }{\rm yr}^{-1}\)kpc−2) and use the [S II] λλ6717/6731 ratio to estimate the local pressure in the ionised plasma. We discuss the correlations discovered between these physical quantities, and use them to infer aspects of the physics of star formation in these extreme star forming environments. In particular, we find a correlation between the star formation rate and the inferred ionisation parameter. We examine the possible reasons for this correlation, and determine that the most likely explanation is that the more active star forming regions have a different distribution of molecular gas which favour higher ionisation parameters in the ionised plasma.

Keywords

Stars: star formation Interstellar medium: HII regions Galaxies: starburst, Chemical abundances 

References

  1. Adamo, A., Östlin, G., Zackrisson, E., Hayes, M., Cumming, R.J., Micheva, G.: Mon. Not. R. Astron. Soc. 407, 870 (2010) ADSCrossRefGoogle Scholar
  2. Andrews, J.E., et al.: Astrophys. J. 767, 51 (2013) ADSCrossRefGoogle Scholar
  3. Armus, L., et al.: Publ. Astron. Soc. Pac. 121, 559 (2009) ADSCrossRefGoogle Scholar
  4. Arthur, S.J.: Astrophys. J. 670, 471 (2007) ADSCrossRefGoogle Scholar
  5. Bastian, N., Saglia, R.P., Goudfrooij, P., Kissler-Patig, M., Maraston, C., Schweizer, F., Zoccali, M.: Astron. Astrophys. 448, 881 (2006) ADSCrossRefGoogle Scholar
  6. Bastian, N., Gieles, M., Goodwin, S.P., Trancho, G., et al.: Mon. Not. R. Astron. Soc. 389, 223 (2008) ADSCrossRefGoogle Scholar
  7. Beccari, G., et al.: Astrophys. J. 720, 1108 (2010) ADSCrossRefGoogle Scholar
  8. Bekki, K., Meurer, G.R.: Astrophys. J. Lett. 765, 22 (2013) ADSCrossRefGoogle Scholar
  9. Cappellari, M., et al.: Nature 484, 485 (2012) ADSCrossRefGoogle Scholar
  10. Cecil, G., Dopita, M.A., Groves, B., Wilson, A.S., Ferruit, P., Pécontal, E., Binette, L.: Astrophys. J. 568, 627 (2002) ADSCrossRefGoogle Scholar
  11. Chandar, R., et al.: Astrophys. J. 719, 966 (2010) ADSCrossRefGoogle Scholar
  12. De Marchi, G., et al.: Astrophys. J. 739, 27 (2011) ADSCrossRefGoogle Scholar
  13. Dickey, J.M., Hanson, M.M., Helou, G.: Astrophys. J. 352, 522 (1990) ADSCrossRefGoogle Scholar
  14. Dopita, M.A., Ryder, S.D.: Astrophys. J. 430, 163 (1994) ADSCrossRefGoogle Scholar
  15. Dopita, M.A., Fischera, J., Sutherland, R.S., Kewley, L.J., Tuffs, R.J., Popescu, C.C., van Breugel, W., Groves, B.A., Leitherer, C.: Astrophys. J. 647, 244 (2006) ADSCrossRefGoogle Scholar
  16. Dopita, M.A., Groves, B.A., Sutherland, R.S., Binette, L., Cecil, G.: Astrophys. J. 572, 753 (2002) ADSCrossRefGoogle Scholar
  17. Dopita, M.A., Groves, B.A., Sutherland, R.S., Kewley, L.J.: Astrophys. J. 583, 727 (2003) ADSCrossRefGoogle Scholar
  18. Dopita, M., Hart, J., McGregor, P., Oates, P., Bloxham, G., Jones, D.: Astrophys. Space Sci. 310, 255 (2007) ADSCrossRefGoogle Scholar
  19. Dopita, M., Rhee, J., Farage, C., McGregor, P., Bloxham, G., Green, A., Roberts, B., Neilson, J., Wilson, G., Young, P., Firth, P., Busarello, Merluzzi, P.: Astrophys. Space Sci. 327, 245 (2010a) ADSCrossRefGoogle Scholar
  20. Dopita, M.A., et al.: Astrophys. J. 710, 964 (2010b) ADSCrossRefGoogle Scholar
  21. Dopita, M.A., Sutherland, R.S., Nicholls, D.C., Kewley, L.J., Vogt, F.P.A.: Astrophys. J. Suppl. Ser., accepted (2013) Google Scholar
  22. Gieles, M., Larsen, S.S., Scheepmaker, R.A., Bastian, N., Hass, M.R., Lamers, H.J.G.L.M.: Astron. Astrophys. 446, L9 (2006) ADSCrossRefGoogle Scholar
  23. Green, A.W., Glazebrook, K., McGregor, P.J., Abraham, R.G., Poole, G.B., Damjanov, I., McCarthy, P.J., Colless, M., Sharp, R.G.: Nature 467, 684 (2010) ADSCrossRefGoogle Scholar
  24. Hopkins, P.F., Cox, T.J., Hernquist, L., Narayanan, D., Hayward, C.C., Murray, N.: Mon. Not. R. Astron. Soc. 430, 1901 (2013) ADSCrossRefGoogle Scholar
  25. Hoversten, E.A., Glazebrook, K.: Astrophys. J. 675, 163 (2008) ADSCrossRefGoogle Scholar
  26. Joung, M.R., Mac Low, M.-M., Bryan, G.L.: Astrophys. J. 704, 137 (2009) ADSCrossRefGoogle Scholar
  27. Juneau, S., Narayanan, D.T., Moustakas, J., Shirley, Y.L., Bussmann, R.S., Kennicutt, R.C. Jr., Vanden Bout, P.A.: Astrophys. J. 707, 1217 (2009) ADSCrossRefGoogle Scholar
  28. Hu, R.-Y., Lou, Y.-Q.: Mon. Not. R. Astron. Soc. 390, 1619 (2008) ADSGoogle Scholar
  29. Kennicutt, R.C. Jr.: Annu. Rev. Astron. Astrophys. 36, 189 (1998) ADSCrossRefGoogle Scholar
  30. Kewley, L.J., Dopita, M.A.: Astrophys. J. Suppl. Ser. 142, 35 (2002) ADSCrossRefGoogle Scholar
  31. Kruijssen, J.M.D., Pelupessy, F.I., Lamers Henny, J.G.L.M., Portegies Zwart, S.F., Bastian, N., Icke, V.: Mon. Not. R. Astron. Soc. 421, 1927 (2012) ADSCrossRefGoogle Scholar
  32. Larsen, S.S.: Astron. Astrophys. 494, 539 (2009) ADSCrossRefGoogle Scholar
  33. Le Floc’h, E., et al.: Astrophys. J. 632, 169 (2005) ADSCrossRefGoogle Scholar
  34. Leitherer, C., Heckman, T.M.: Astrophys. J. Suppl. Ser. 96, 9 (1995) ADSCrossRefGoogle Scholar
  35. Leitherer, C., Schaerer, D., Goldader, J.D., Delgado, R.M.G., Robert, C., Kune, D.F., de Mello, D.F., Devost, D., Heckman, T.M., et al.: Astrophys. J. Suppl. Ser. 123, 3 (1999) ADSCrossRefGoogle Scholar
  36. Lejeune, T., Cuisinier, F., Buser, R.: Astron. Astrophys. Suppl. Ser. 125, 229 (1997) ADSCrossRefGoogle Scholar
  37. Magnelli, B., Elbaz, D., Chary, R.R., Dickinson, M., Le Borgne, D., Frayer, D.T., Willmer, C.N.A.: Astron. Astrophys. 528, A35 (2011) ADSCrossRefGoogle Scholar
  38. Maraston, C., Bastian, N., Saglia, R.P., Kissler-Patig, M., Schweizer, F., Goudfrooij, P.: Astron. Astrophys. 416, 467 (2004) ADSCrossRefGoogle Scholar
  39. Meurer, G.R., et al.: Astrophys. J. 695, 765 (2009) ADSCrossRefGoogle Scholar
  40. Pettini, M., Pagel, B.E.J.: Mon. Not. R. Astron. Soc. 348, L59 (2004) ADSCrossRefGoogle Scholar
  41. Powell, L.C., Bournaud, F., Chapon, D., Teyssier, R.: Mon. Not. R. Astron. Soc. 434, 1028 (2013) ADSCrossRefGoogle Scholar
  42. Portegies, Z., Simon, F., McMillan, S.L.W., Gieles, M.: Annu. Rev. Astron. Astrophys. 48, 43 (2010) ADSGoogle Scholar
  43. Rich, J.A., Dopita, M.A., Kewley, L.J., Rupke, D.S.N.: Astrophys. J. 721, 505 (2010) ADSCrossRefGoogle Scholar
  44. Rich, J.A., Kewley, L.J., Dopita, M.A.: Astrophys. J. 734, 87 (2011) ADSCrossRefGoogle Scholar
  45. Rich, J.A., Torrey, P., Kewley, L.J., Dopita, M.A., Rupke, D.S.N.: Astrophys. J. 753, 5 (2012) ADSCrossRefGoogle Scholar
  46. Sanders, D.B., Mazzarella, J.M., Kim, D., Surace, J.A., Soifer, B.T.: Astron. J. 126, 1607 (2003) ADSCrossRefGoogle Scholar
  47. Schechter, P.: Astrophys. J. 203, 297 (1976) ADSCrossRefGoogle Scholar
  48. Schmutz, W., Leitherer, C., Gruenwald, R.B.: Publ. Astron. Soc. Pac. 104, 1164 (1992) ADSCrossRefGoogle Scholar
  49. Schweizer, F., Seitzer, P.: Astron. J. 116, 2206 (1998) ADSCrossRefGoogle Scholar
  50. Smith, L.J., Westmoquette, M.S., Gallagher, J.S., O’Connell, R.W., Rosario, D.J., de Grijs, R.: Mon. Not. R. Astron. Soc. 370, 513 (2006) ADSCrossRefGoogle Scholar
  51. Swinbank, A.M., Smail, I., Sobral, D., Theuns, T., Best, P.N., Greach, J.E.: Astrophys. J. 760, 130 (2012) ADSCrossRefGoogle Scholar
  52. Tenorio-Tagle, G.: Astron. Astrophys. 71, 59 (1979) ADSGoogle Scholar
  53. Trancho, G., Bastian, N., Miller, B.W., Schweizer, F.: Astrophys. J. 664, 284 (2007) ADSCrossRefGoogle Scholar
  54. Treu, T., Auger, M.W., Koopmans, L.V.E., Gavazzi, R., Marshall, P.J., Bolton, A.S.: Astrophys. J. 709, 1195 (2010) ADSCrossRefGoogle Scholar
  55. van Dokkum, P.G.: Astrophys. J. 674, 29 (2008) ADSCrossRefGoogle Scholar
  56. Weidner, C., Kroupa, P., Pflamm-Altenburg, J.: Mon. Not. R. Astron. Soc. 412, 979 (2011) ADSGoogle Scholar
  57. Westmoquette, M.S., Smith, L.J., Gallagher, J.S., O’Connell, R.W. III, Rosario, D.J., de Grijs, R.: Astrophys. J. 671, 358 (2007) ADSCrossRefGoogle Scholar
  58. Wisnioski, E., Glazebrook, K., Blake, C., Poole, G.B., Green, A.W., Wyder, T., Martin, C.: Mon. Not. R. Astron. Soc. 422, 3339 (2012) ADSCrossRefGoogle Scholar
  59. Zhang, Q., Fall, S.M., Whitmore, B.C.: Astrophys. J. 561, 727 (2001) ADSCrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media Dordrecht 2013

Authors and Affiliations

  • Michael A. Dopita
    • 1
    • 2
    • 3
  • Jeffrey Rich
    • 4
  • Frédéric P. A. Vogt
    • 1
  • Lisa J. Kewley
    • 1
    • 3
  • I-Ting Ho
    • 3
  • Hassan M. Basurah
    • 2
  • Alaa Ali
    • 2
  • Morsi A. Amer
    • 2
  1. 1.Research School of Astronomy and AstrophysicsAustralian National UniversityWestonAustralia
  2. 2.Astronomy DepartmentKing Abdulaziz UniversityJeddahSaudi Arabia
  3. 3.Institute for AstronomyUniversity of HawaiiHonoluluUSA
  4. 4.Carnegie ObservatoriesPasadenaUSA

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