Publications of The Korean Astronomical Society (천문학논총)

The Korean Astronomical Society (한국천문학회)
권호 표지
DOI QR코드

DOI QR Code

UNVEILING THE PROPERTIES OF FLS 1718+59: A GALAXY-GALAXY GRAVITATIONAL LENS SYSTEM

  • TAAK, YOON CHAN (CEOU/Astronomy Program, Department of Physics and Astronomy, Seoul National University) ;
  • IM, MYUNGSHIN (CEOU/Astronomy Program, Department of Physics and Astronomy, Seoul National University)
  • Received : 2014.11.30
  • Accepted : 2015.06.30
  • Published : 2015.09.30
Download PDF
⟨ Previous Next ⟩

Abstract

We present the results of the analysis of FLS 1718+59, a galaxy-galaxy gravitational lens system in the Spitzer First Look Survey (FLS) field. A background galaxy ($z_s=0.245$) is severely distorted by a nearby elliptical galaxy ($z_l=0.08$), via gravitational lensing. The system is analysed by several methods, including surface brightness fitting, gravitational lens modeling, and spectral energy distribution fitting. From Galfit and Ellipse we measure basic parameters of the galaxy, such as the effective radius and the average surface brightness within it. gravlens yields the total mass inside the Einstein radius ($R_{Ein}$), and MAGPHYS gives us an estimate of the stellar mass inside $R_{Ein}$. By comparing these parameters, we confirm that the lens galaxy is an elliptical galaxy on the Fundamental Plane and calculate the stellar mass fraction inside $R_{Ein}$, and discuss the results with regards to the initial mass function.

Keywords

References

  1. Bertin, E. & Arnouts, S., 1996, SExtractor: Software for Source Extraction, A&AS, 117, 393 https://doi.org/10.1051/aas:1996164
  2. Chabrier, G., 2003, Galactic Stellar and Substellar Initial Mass Function, PASP, 115, 763 https://doi.org/10.1086/376392
  3. da Cunha, E., Charlot, S., & Elbaz, D., 2008, A Simple Model to Interpret the Ultraviolet, Optical and Infrared Emission from Galaxies, MNRAS, 388, 1595 https://doi.org/10.1111/j.1365-2966.2008.13535.x
  4. Djorgovski, S., & Davis, M., 1987, Fundamental Properties of Elliptical Galaxies, ApJ, 313, 59 https://doi.org/10.1086/164948
  5. Hyde, J. B. & Bernardi, M., 2009, The Luminosity and Stellar Mass Fundamental Plane of Early-type Galaxies, MNRAS, 396, 1171 https://doi.org/10.1111/j.1365-2966.2009.14783.x
  6. Keeton, C. R., 2001, Computational Methods for Gravitational Lensing, arXiv:astro-ph/0102340
  7. Krist, J. E., Hook, R. N., & Stoehr, F., 2011, 20 Years of Hubble Space Telescope Optical Modeling Using Tiny Tim, Proceedings of the SPIE, 8127
  8. Longhetti, M., & Saracco, P., 2009, Stellar Mass Estimates in Early-type Galaxies: Procedures, Uncertainties and Models Dependence, MNRAS, 394, 774 https://doi.org/10.1111/j.1365-2966.2008.14375.x
  9. Oguri, M., Rusu, C. E., & Falco, E. E., 2014, The Stellar and Dark Matter Distributions in Elliptical Galaxies from the Ensemble of Strong Gravitational Lenses, MNRAS, 439, 2494 https://doi.org/10.1093/mnras/stu106
  10. Peng, C. Y., Ho, L. C., Impey, C. D., & Rix, H.-W., 2002, Detailed Structural Decomposition of Galaxy Images, AJ, 124, 266 https://doi.org/10.1086/340952
  11. Salpeter, E. E., 1955, The Luminosity Function and Stellar Evolution, ApJ, 121, 161 https://doi.org/10.1086/145971
  12. Schneider, P., Ehlers, J., & Falco, E. E., 1992, Gravitational Lenses, Springer-Verlag Berlin Heidelberg New York
  13. Sersic, J. L., 1968, Atlas de Galaxias Australes, Cordoba, Argentina: Observatorio Astronomico