A photometric study of the M51 system

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Astronomical Photometry, Galactic Radiation, Galactic Structure, Luminous Intensity, Spiral Galaxies, Astronomical Photography, Color-Color Diagram, Electrophotometry, Stellar Envelopes, Stellar Magnitude, Stellar Mass

Scientific paper

Photoelectric (UBV and I) and photographic observations of the two components of the M51 system, NGC 5194 and NGC 5195, are presented in the form of photoelectric drift scans, composite photographs, calibrated contour maps, color-color diagrams, and three-dimensional plots. The large-scale features and symmetries of the system are described, and individual regions are examined in detail. Approximate luminosities of these regions and integrated luminosities of the complete system are determined. The results indicate that: (1) the maximum detected extent of the system is 40 arcmin or 120 kpc; (2) the mass in the outer envelope is equal to the mass obtained for the bright optical components if an M/L ratio of 10 is assumed; (3) the east side of NGC 5194 is brighter than the west side; (4) the faint outer regions of NGC 5194 are large and structured; (5) there seems to be internal interaction between the two galaxies; (6) the two galactic nuclei show complex structure; (7) the luminosity profile of NGC 5194 appears to be unique; and (8) the two galaxies may belong to a common system or mass aggregate and appear to be interconnected.

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