Is dark matter present in NGC4736? An iterative spectral method for finding mass distribution in spiral galaxies

Abstract

An iterative method for reconstructing mass distribution in spiral galaxies using a thin disk approximation is developed. As an example, the method is applied to galaxy NGC 4736; its rotation curve does not allow one to employ a model with a massive spherical halo. We find a global mass distribution in this galaxy (without non-baryonic dark matter) that agrees perfectly with the high resolution rotation curve of the galaxy. This mass distribution is consistent with the $I$-band luminosity profile with the mean mass-to-light ratio $M/L_I=1.2$, and also agrees with the amount of hydrogen observed in the outermost regions of the galaxy. We predict the total mass of the galaxy to be only $3.43\times10^{10}M_{\sun}$. It is very close to the value predicted by the modified gravity models and much less than the currently accepted value of $5.0\times10^{10}M_{\sun}$ (with $\approx 70$ of the mass in a dark matter halo).

in v2 version: 1) changed the reference luminosities of the Sun in different bands - this affects mass-to-light ratio, giving more reliable 1.2 in the I-band, 2) found typos corrected, 3) corrected references to literature, figures and equations 4) text permutations + language corrections, accepted for publication in ApJ, May 2008

References in corpus (6)

• Rotation Curves of Spiral Galaxies
• Dark matter maps reveal cosmic scaffolding
• Galaxy Rotation Curves Without Non-Baryonic Dark Matter
• A Revised Model for the Formation of Disk Galaxies: Low Spin and Dark-Halo Expansion
• Central Rotation Curves of Spiral Galaxies
• Radial Distribution of the Mass-to-Luminosity Ratio in Spiral Galaxies and Massive Dark Cores

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