Mass modelling of a superthin galaxy, FGC 1540статья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 28 сентября 2018 г.
Аннотация:We present high resolution Hi 21cm Giant Meterwave Radio Telescope (GMRT)
observations of the superthin galaxy FGC1540 with a spatial resolution of 10 ×
8 and a spectral resolution of 1.73 km/s and an rms noise of 0.9 mJy per beam.
We obtain its rotation curve as well as deprojected radial Hi surface density profile
by fitting a 3-dimensional tilted ring model directly to the Hi data cubes by using
the publicly-available software, Fully Automated Tirrific (FAT). We also present the
rotation curve of FGC1540 derived from its optical spectroscopy study using the 6-m
BTA telescope of the Special Astrophysical Observatory of the Russian Academy of
Sciences. We use the rotation curve, the Hi surface density profile together with Spitzer
3.6 μm and the SDSS i–band data to construct the mass models for FGC1540. We
find that both the Pseudo-isothermal (PIS), as well as Navarro-Frenk-White (NFW)
dark matter (DM) halos, fit the observed rotation curve equally well. The PIS model
indicates a compact dark matter halo (RC/RD < 2), with the best-fitting core radius
(RC) approximately half the exponential stellar disc scale length (RD), which is in
agreement with the mass models of superthin galaxies studied earlier in the literature.
Since the vertical thickness of the galactic stellar disc is determined by a balance
between the net gravitational field and the velocity dispersion in the vertical direction,
the compact dark matter halo may be primarily responsible in regulating the superthin
vertical structure of the stellar disc in FGC1540 as was found in case of the superthin
galaxy UGC7321