Luminosity distribution in galaxies. I - The elliptical galaxy NGC 3379 as a luminosity distribution standard

Details Luminosity distribution in galaxies. I - The elliptical galaxy NGC 3379 as a luminosity distribution standard Luminosity distribution in galaxies. I - The elliptical galaxy NGC 3379 as a luminosity distribution standard

Aug 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apjs...40..699d&link_type=abstract

Astrophysical Journal Supplement Series, vol. 40, Aug. 1979, p. 699-731.

Other

149

Distribution (Property), Elliptical Galaxies, Galactic Structure, Luminosity, Photometry, Astrometry, Astronomical Catalogs, Astronomical Photography, Graphs (Charts), Stellar Magnitude, Tables (Data)

Scientific paper

A standard mean luminosity profile in the B band of the El galaxy NGC 3379 along its east-west x-axis is derived from four sets of medium- and low-resolution photographic and photoelectric McDonald data. The 154 mean points cover a range in excess of 11 mag down to μB = 27.8 mag (x = 7'.3), with possible detection out to x = 16'.3 (μB ≍ 30.9).
The profile is represented within ±0.08 mag at ll x > 10" by
μ1 = 14.076 + 3.0083 x1/4 (x in arcsec)
Near the center the galaxy is brighter than μI by up to 0.35 mag; the excess can be represented by a Gaussian core
μII = 18.565 + 0.03965 r2 (r in arcsec)
contributing 19.8% of the integrated magnitude B = 11.97 within r* - 12" and 4.0% of the total magnitude BT = 10.225 of the galaxy.
This two-component model convolved by the appropriate point spread function represents the data within a standard deviation of 0.04 mag over the whole range. Other analytical formulae give generally poorer fits. There is no evidence for a tidal cutoff or a tidal extension.
The integrated magnitudes derived from the model agree with aperture photometry (47 values) within 0.05 mag (s.d.). structure

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