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THINGS about MOND

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Abstract
We present an analysis of 12 high-resolution galactic rotation curves from The HI Nearby Galaxy Survey (THINGS) in the context of modified Newtonian dynamics (MOND). These rotation curves were selected to be the most reliable for mass modelling, and they are the highest quality rotation curves currently available for a sample of galaxies spanning a wide range of luminosities. We fit the rotation curves with the "simple" and "standard" interpolating functions of MOND, and we find that the "simple" function yields better results. We also redetermine the value of a(0), and find a median value very close to the one determined in previous studies, a(0) = (1.22 +/- 0.33) x 10(-8) cm s(-2). Leaving the distance as a free parameter within the uncertainty of its best independently determined value leads to excellent quality fits for 75% of the sample. Among the three exceptions, two are also known to give relatively poor fits in Newtonian dynamics plus dark matter. The remaining case (NGC 3198) presents some tension between the observations and the MOND fit, which might, however, be explained by the presence of non-circular motions, by a small distance, or by a value of a(0) at the lower end of our best-fit interval, 0.9 x 10(-8) cm s(-2). The best-fit stellar M/L ratios are generally in remarkable agreement with the predictions of stellar population synthesis models. We also show that the narrow range of gravitational accelerations found to be generated by dark matter in galaxies is consistent with the narrow range of additional gravity predicted by MOND.
Keywords
EXTENDED ROTATION CURVES, TULLY-FISHER RELATION, EXTRAGALACTIC DISTANCE SCALE, LOW SURFACE BRIGHTNESS, HUBBLE-SPACE-TELESCOPE, MODIFIED NEWTONIAN DYNAMICS, gravitation, galaxies: spiral, galaxies: kinematics and dynamics, dark matter, DARK-MATTER HALOS, STELLAR MASS, KEY PROJECT, SPIRAL GALAXIES

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Citation

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MLA
Gentile, Gianfranco, B Famaey, and WJG de Blok. “THINGS About MOND.” ASTRONOMY & ASTROPHYSICS 527 (2011): n. pag. Print.
APA
Gentile, G., Famaey, B., & de Blok, W. (2011). THINGS about MOND. ASTRONOMY & ASTROPHYSICS, 527.
Chicago author-date
Gentile, Gianfranco, B Famaey, and WJG de Blok. 2011. “THINGS About MOND.” Astronomy & Astrophysics 527.
Chicago author-date (all authors)
Gentile, Gianfranco, B Famaey, and WJG de Blok. 2011. “THINGS About MOND.” Astronomy & Astrophysics 527.
Vancouver
1.
Gentile G, Famaey B, de Blok W. THINGS about MOND. ASTRONOMY & ASTROPHYSICS. 2011;527.
IEEE
[1]
G. Gentile, B. Famaey, and W. de Blok, “THINGS about MOND,” ASTRONOMY & ASTROPHYSICS, vol. 527, 2011.
@article{1253256,
  abstract     = {We present an analysis of 12 high-resolution galactic rotation curves from The HI Nearby Galaxy Survey (THINGS) in the context of modified Newtonian dynamics (MOND). These rotation curves were selected to be the most reliable for mass modelling, and they are the highest quality rotation curves currently available for a sample of galaxies spanning a wide range of luminosities. We fit the rotation curves with the "simple" and "standard" interpolating functions of MOND, and we find that the "simple" function yields better results. We also redetermine the value of a(0), and find a median value very close to the one determined in previous studies, a(0) = (1.22 +/- 0.33) x 10(-8) cm s(-2). Leaving the distance as a free parameter within the uncertainty of its best independently determined value leads to excellent quality fits for 75% of the sample. Among the three exceptions, two are also known to give relatively poor fits in Newtonian dynamics plus dark matter. The remaining case (NGC 3198) presents some tension between the observations and the MOND fit, which might, however, be explained by the presence of non-circular motions, by a small distance, or by a value of a(0) at the lower end of our best-fit interval, 0.9 x 10(-8) cm s(-2). The best-fit stellar M/L ratios are generally in remarkable agreement with the predictions of stellar population synthesis models. We also show that the narrow range of gravitational accelerations found to be generated by dark matter in galaxies is consistent with the narrow range of additional gravity predicted by MOND.},
  articleno    = {A76},
  author       = {Gentile, Gianfranco and Famaey, B and de Blok, WJG},
  issn         = {0004-6361},
  journal      = {ASTRONOMY & ASTROPHYSICS},
  keywords     = {EXTENDED ROTATION CURVES,TULLY-FISHER RELATION,EXTRAGALACTIC DISTANCE SCALE,LOW SURFACE BRIGHTNESS,HUBBLE-SPACE-TELESCOPE,MODIFIED NEWTONIAN DYNAMICS,gravitation,galaxies: spiral,galaxies: kinematics and dynamics,dark matter,DARK-MATTER HALOS,STELLAR MASS,KEY PROJECT,SPIRAL GALAXIES},
  language     = {eng},
  pages        = {11},
  title        = {THINGS about MOND},
  url          = {http://dx.doi.org/10.1051/0004-6361/201015283},
  volume       = {527},
  year         = {2011},
}

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