Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978a%26a....63..415c&link_type=abstract
Astronomy and Astrophysics, vol. 63, no. 3, Feb. 1978, p. 415-424. In French.
Astronomy and Astrophysics
Astrophysics
10
Abundance, Galactic Rotation, Stellar Mass, Astronomical Spectroscopy, H Alpha Line, H Ii Regions, Luminous Intensity, Nebulae
Scientific paper
Two photographs of NGC 4088, taken with a 120 cm telescope, show the presence of an HII region near the nucleus. Numerous lanes of dust explain the relatively low and constant ratios: H-alpha (NII) and (NII)/(SII). Four image-tube spectra taken with the nebular spectrograph of a 193 cm telescope (35 A/mm in the spectral range 6450-6800 A) confirm the important asymmetry of the galaxy, visible on the photographs. The rotation curve for the North-East region is 100 km per sec lower than for the South-West region. This difference may be explained either by ejection of matter from a nuclear hot-spot, or by attraction and tidal effect from the nearby galaxy NGC 4085. Assuming a distance of 11 Mpc, the mass out to 115 sec (North-East) and 95 sec (South-West), is about 2.5 times 10 to the 10th power solar masses and the mass-to-luminosity ratio is about one.
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