Mass modelling of a superthin galaxy, FGC 1540

• DOI: 10.1093/mnras/sty1856
• Publication Date: 2018-07-14T08:45:44Z
• Authors: Sushma Kurapati; Arunima Banerjee; Jayaram N Chengalur; Dmitry Makarov; Svyatoslav Borisov; Anton Afanasiev; Aleksandra Antipova
• Keywords: Velocity dispersion

We present high resolution H i 21 cm Giant Meterwave Radio Telescope observations of the superthin galaxy FGC 1540 with a spatial 10 arcsec × 8 and spectral 1.73 km s−1 an rms noise 0.9 mJy per beam. obtain its rotation curve as well deprojected radial surface density profile by fitting 3D tilted-ring model directly to data cubes using publicly available software, Fully Automated tirrific. also derived from optical spectroscopy study 6-m BTA telescope Special Astrophysical Observatory Russian Academy Sciences. use curve, together Spitzer 3.6 |$\mu$|m, SDSS i-band construct mass models for 1540. find that both Pseudo-isothermal () Navarro–Frenk–White dark matter (DM) haloes, fit observed equally well. The PIS indicates compact DM halo (RC/RD < 2), best-fitting core radius (RC) approximately half exponential stellar disc scale length (RD), which is in agreement galaxies studied earlier literature. Since vertical thickness galactic determined balance between net gravitational field velocity dispersion direction, may be primarily responsible regulating structure was found case UGC7321.