Journal of The Korean Astronomical Society (천문학회지)

The Korean Astronomical Society (한국천문학회)
권호 표지
DOI QR코드

DOI QR Code

FLUX CALIBRATION METHOD OF SLIT SPECTROMETER FOR EXTENDED SOURCES

  • Lee, Sung-Ho (Korea Astronomy and Space Science Institute) ;
  • Park, Soo-Jong (Department of Astronomy and Space Science, Kyung Hee University)
  • Published : 2006.12.31
Download PDF
⟨ Previous Next ⟩

Abstract

Long slit spectrometers are widely used in optical and infrared bands in astronomy. Absolute flux calibration for extended sources, however, is not straightforward, because a portion of the radiation energy from a flux calibration star is blocked by the narrow slit width. Assuming that the point spread function(PSF) of the star is circularly symmetric, we develop a robust method to extrapolate the detected stellar flux to the unobscured flux using the measured PSF along the slit-length direction. We apply this method to our long slit data and prove that the uncertainty of the absolute flux calibration is less than a few percents.

Keywords

References

  1. Cox A.N., 2000, Allen's astrophysical quantities (4th ed.), AIP press, New York
  2. Eigenbrod, A., Courbin, F., Meylan, G., Vuissoz, C. & Magain, P., 2006, COSMOGRAIL: the COSmological MOnitoring of GRAvItational Lenses. III. Red- shift of the lensing galaxy in eight gravitationally lensed quasars, A&A, 451, 759 https://doi.org/10.1051/0004-6361:20054454
  3. Eyres S.P.S., Evans A., Geballe T.R., Salama A.,& Smalley B., 1998, Infrared spectroscopy of Sakurai's object, MNRAS, 298, L37 https://doi.org/10.1046/j.1365-8711.1998.01898.x
  4. Hunter, D. A., & Gallagher III, J. S., 1997, An Emission-Line Study of Supergiant Ionized Filaments in Irregular Galaxies, ApJ, 475, 65 https://doi.org/10.1086/303520
  5. Lee, S., Pak, S., Davis, C. J., Herrnstein, R. M., Geballe, T. R., Ho, P. T. P., & Wheeler, J. C., 2003, Interaction between the north-eastern boundary of Sgr A East and giant molecular clouds, MNRAS, 341, 509 https://doi.org/10.1046/j.1365-8711.2003.06425.x
  6. Lee, S., Pak, S., Choi, M., Davis, C. J., Geballe, T. R., Herrnstein, R. M., Ho, P. T. P., Minh, Y. C., & Lee, S.-G., 2006, Three-dimensional observations of $H_2$ emission around Sgr A East - I. Structure of the central 10 parsecs, ApJ, submitted
  7. Luhman, M. L., Jaffe, D. T., Keller, L. D., & Pak, S., 1994, $H_2$ emission as a tracer of molecular hydrogen: Large-scale observations of Orion, ApJ, 436, L185 https://doi.org/10.1086/187663
  8. Massey, P., Valdes, F., & Barnes, J., 1992, A user's guide to reducing slit spectra with IRAF, NOAO
  9. Mountain C.M., Robertson D.J., Lee T.J., & Wade R., 1990, An advanced cooled grating spectrometer for UKIRT, in Crawford D.L., ed., Proc. SPIE Vol. 1235, Instrumentation in Astronomy VII. SPIE, Bellingham, p. 25
  10. Pak, S., 2000, Fabry-Perot spectrometer in astronomy, Pub. of the Korean Ast. Soc., 15S, 127
  11. Pak, S., Jaffe, D. T., Stacey, G. J., Bradford, C. M., Klumpe, E. W., & Keller, L. D., 2004, Near-infrared molecular hydrogen emission from the central regions of galaxies: Regulated physical conditions in the Interstellar Medium, ApJ, 609, 692 https://doi.org/10.1086/421233
  12. Pyo, T.-S., 2002, Near infrared [Fe II] spectroscopy of jets and winds emanating from young stellar objects, PhD thesis, University of Tokyo
  13. Rieke, G. H., 2002, Detection of light (2nd ed), Cambridge Univ. Press, Cambridge

Cited by

  1. Three‐Dimensional Observations of H2Emission around Sgr A East. I. Structure in the Central 10 pc of Our Galaxy vol.674, pp.1, 2008, https://doi.org/10.1086/524128
  2. Fluorescent H2 Emission Lines from the Reflection Nebula NGC 7023 Observed with IGRINS vol.841, pp.1, 2017, https://doi.org/10.3847/1538-4357/aa6bf7