NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-26 T23:03:02 PDT
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For refcode 2015MNRAS.453.2214M:
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NED Abstract

Copyright by Royal Astronomical Society. 2015MNRAS.453.2214M Angular momentum of disc galaxies with a lognormal density distribution Marr, John H. Abstract. By postulating that the majority of the mass and angular momentum of a disc galaxy is confined to the disc with a lognormal surface density distribution, and that galactic discs are substantially, if not fully, self-gravitating, it may be shown that the resultant rotation curves (RCs) display a good overall fit to observational data for a wide range of galaxy types. With this hypothesis, the total angular momentum J, and total energy |E| of 38 disc galaxies was computed and plotted against the derived disc masses, with best fit slopes for J of 1.683 +/- 0.018 and |E| of 1.643 +/- 0.038, and a universal disc spin parameter lambda = 0.423 +/- 0.014. Using the disc parameters V_max_ and R_max_ as surrogates for the virial velocity and radius, a virial mass estimator M_{disc}_ is proportional to R_{max}_ V_{max}_^2 was generated, with a log-log slope of 1.024 +/- 0.014 for the 38 galaxies, and a proportionality constant lambda* = 1.47 +/- 0.20 x 10^5^ M_sun_kpc^- 1^ km^- 2^ s^2^. This relationship has less scatter than M is proportional to (V_rot_)^{alpha}^, and may provide an alternative to the Tully-Fisher relation in determining virial disc masses. Key words: galaxies: fundamental parameters, galaxies: individual: NGC 3198, galaxies: kinematics and dynamics
Retrieve 37 NED objects in this reference.
Please click here for ADS abstract

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