Publications of The Korean Astronomical Society (천문학논총)

The Korean Astronomical Society (한국천문학회)
권호 표지
DOI QR코드

DOI QR Code

AKARI IRC INFRARED 2.5-5 ㎛ SPECTROSCOPY OF NEARBY LUMINOUS INFRARED GALAXIES

  • Imanishi, Masatoshi (Subaru Telescope, Department of Astronomy, School of Science, Graduate University for Advanced Studies (SOKENDAI)) ;
  • Nakagawa, Takao (Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency) ;
  • Shirahata, Mai (Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency) ;
  • Ohyama, Yoichi (Institute of Astronomy and Astrophysics Academia Sinica) ;
  • Onaka, Takashi (Department of Astronomy, Graduate School of Science, University of Tokyo)
  • Received : 2012.03.01
  • Accepted : 2012.08.02
  • Published : 2012.09.16
Download PDF
⟨ Previous Next ⟩

Abstract

We present the result of systematic AKARI IRC infrared $2.5-5{\mu}m$ spectroscopy of >100 nearby luminous infrared galaxies, to investigate the energetic roles of starbursts and optically-elusive buried AGNs. Based on (1) the equivalent widths of the $3.3{\mu}m$ PAH emission features, (2) the optical depths of absorption features, and (3) continuum slopes, we can disentangle emission from starbursts and AGNs. We find that the energetic importance of buried AGNs increases with increasing galaxy infrared luminosities, suggesting that the AGN-starburst connections (and thereby possible AGN feedback to host galaxies) are luminosity dependent.

Keywords

References

  1. Caputi, K. I., et al., 2007, The Infrared Luminosity Function of Galaxies at Redshifts z = 1 and z-2 in the GOODS Fields, ApJ, 660, 97 https://doi.org/10.1086/512667
  2. Cowie, L. L., Songaila, A., Hu, E. M., & Cohen, J. D., 1996, New Insight on Galaxy Formation and Evolution from Keck Spectroscopy of the Hawaii Deep Fields, AJ, 112, 839 https://doi.org/10.1086/118058
  3. Granato, G. L., Zotti, G. D., Silva, L., Bressan. A., & Danese, L., 2004, A Physical Model for the Coevolution of QSOs and Their Spheroidal Hosts, ApJ, 600, 580 https://doi.org/10.1086/379875
  4. Hopkins, P. F., Hernquist, L., Cox, T. J., Di Matteo, T., Robertson, B., & Springel, V., 2006, A Unified, Merger-driven Model of the Origin of Starbursts, Quasars, the Cosmic X-Ray Background, Supermassive Black Holes, and Galaxy Spheroids, ApJS, 163, 1 https://doi.org/10.1086/499298
  5. Imanishi, M., 2009, Luminous Buried Active Galactic Nuclei as a Function of Galaxy Infrared Luminosity Revealed through Spitzer Low-resolution Infrared Spectroscopy, ApJ, 694, 751 https://doi.org/10.1088/0004-637X/694/2/751
  6. Imanishi, M. & Dudley, C. C., 2000, Energy Diagnoses of Nine Infrared Luminous Galaxies Based on 3-4 Micron Spectra, ApJ, 545, 701 https://doi.org/10.1086/317863
  7. Imanishi, M., Dudley, C. C., & Maloney, P. R., 2006, Infrared 3-4 ${\mu}m$ Spectroscopic Investigations of a Large Sample of Nearby Ultraluminous Infrared Galaxies, ApJ, 637, 114 https://doi.org/10.1086/498391
  8. Imanishi, M., Dudley, C. C., Maiolino, R., Maloney, P. R., Nakagawa, T., & Risaliti, G., 2007, A Spitzer IRS Low-Resolution Spectroscopic Search for Buried AGNs in Nearby Ultraluminous Infrared Galaxies: A Constraint on Geometry between Energy Sources and Dust, ApJS, 171, 72 https://doi.org/10.1086/513715
  9. Imanishi, M., Imase, K., Oi, N., & Ichikawa, K., 2011, Subaru and Gemini High Spatial Resolution Infrared 18 ${\mu}m$Imaging Observations of Nearby Luminous Infrared Galaxies, AJ, 141, 156 https://doi.org/10.1088/0004-6256/141/5/156
  10. Imanishi, M. & Maloney, P. R., 2003, 3.1 Micron $H_{2}O$ Ice Absorption in LINER-Type Ultraluminous Infrared Galaxies with Cool Far-Infrared Colors: The Centrally Concentrated Nature of Their Deeply Buried Energy Sources, ApJ, 588, 165 https://doi.org/10.1086/368354
  11. Imanishi, M., Maiolino, R., & Nakagawa, T., 2010a, Spitzer Infrared Low-Resolution Spectroscopic Study of Buried Active Galactic Nuclei in a Complete Sample of Nearby Ultraluminous Infrared Galaxies, ApJ, 709, 801 https://doi.org/10.1088/0004-637X/709/2/801
  12. Imanishi, M., Nakagawa, T., Ohyama, Y., Shirahata, M., Wada, T., & Onaka, T., 2008, Systematic Infrared 2.5-5 ${\mu}m$ Spectroscopy of Nearby Ultraluminous Infrared Galaxies with AKARI, PASJ, 60, S489
  13. Imanishi, M., Nakagawa, T., Ohyama, Y., Shirahata, M., & Onaka, T., 2010b, AKARI IRC Infrared 2.5-5 ${\mu}m$ Spectroscopy of a Large Sample of Luminous Infrared Galaxies, ApJ, 721, 1233 https://doi.org/10.1088/0004-637X/721/2/1233
  14. Onaka, T., et al., 2007, The Infrared Camera (IRC) for AKARI - Design and Imaging Performance, PASJ, 59, 401
  15. Sanders, D. B. & Mirabel, I. F., 1996, Luminous Infrared Galaxies, ARA&A, 34, 749 https://doi.org/10.1146/annurev.astro.34.1.749
  16. Soifer, B. T., et al., 2000, High Resolution Mid- Infrared Imaging of Ultraluminous Infrared Galaxies, AJ, 119, 509 https://doi.org/10.1086/301233
  17. Soifer, B. T., et al., 2001, High-Resolution Mid- Infrared Imaging of Infrared-Luminous Starburst Galaxies, AJ, 122, 1213 https://doi.org/10.1086/322119