The prodigious warp of NGC4013

Details The prodigious warp of NGC4013 The prodigious warp of NGC4013

Jul 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987natur.328..401b&link_type=abstract

Nature (ISSN 0028-0836), vol. 328, July 30, 1987, p. 401-403.

Astronomy and Astrophysics

Astronomy

39

Astronomical Models, Cosmic Gases, Galactic Structure, Radio Spectra, Angular Velocity, Brightness Distribution, Hydrogen Clouds, Mass Distribution

Scientific paper

H I radio synthesis observations reveal that the edge-on Sbc galaxy NGC4013 has the largest regular H I warp so far observed. It extends to a large height above the plane of the galaxy, and begins abruptly at just the radius where photometry indicates the end of the luminous disk. Furthermore, at precisely this position, the rotational velocity is seen to drop by 25 km/s. These observations can only be explained by a situation in which not only the disk-light distribution, but also the disk-mass distribution, suddenly approach zero at the radius of the warp onset. On the basis of a modeling of the H I gas distribution, it is concluded that the line of sight to NGC4013 is, by coincidence, one which shows the warp most clearly.

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