Photometric analysis and decomposition of AP Librae (PKS 1514-24)

Details Photometric analysis and decomposition of AP Librae (PKS 1514-24) Photometric analysis and decomposition of AP Librae (PKS 1514-24)

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987mnras.228..313b&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 228, Sept. 15, 1987, p. 313-327.

Astronomy and Astrophysics

Astronomy

5

Astronomical Photometry, Bl Lacertae Objects, Charge Coupled Devices, Galactic Structure, Spectrum Analysis, Ubv Spectra, Galactic Nuclei, Interstellar Extinction, Spectral Energy Distribution

Scientific paper

BVRI CCD surface photometry of the rapidly variable BL Lac object AP Lib, is presented. The combination of high detector efficiency and photometric accuracy, good seeing and the low nuclear activity at the time of the observations allow a decomposition into nuclear and underlying galaxy components with greater precision than hitherto. The galaxy profile accurately follows a de Vaucouleurs law for ellipticals, at radii from 3 to >20 arcsec (>26 kpc). Structural parameters appear normal for a galaxy of its luminosity (MV = -22.81). The colour data shows a marked gradient towards redder colours at larger radii, the reverse of that usually seen in E galaxies. Ellipse fits indicate that AP Lib is seen almost face-on, with an essentially constant eccentricity ≤0.1. The optical energy spectrum of the quasi-stellar component is examined and appears to be approximately linear, with a spectral index, α, ≈-1.4(±0.1).

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