THINGS about MOND

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dc.contributor.authorGentile, G
dc.contributor.authorFamaey, B
dc.contributor.authorde Blok, W J G
dc.date.accessioned2021-10-08T11:01:06Z
dc.date.available2021-10-08T11:01:06Z
dc.date.issued2011
dc.description.abstractWe 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.
dc.identifier.apacitationGentile, G., Famaey, B., & de Blok, W. J. G. (2011). THINGS about MOND. <i>Astronomy and Astrophysics</i>, 527(4), A76 - 177. http://hdl.handle.net/11427/35086en_ZA
dc.identifier.chicagocitationGentile, G, B Famaey, and W J G de Blok "THINGS about MOND." <i>Astronomy and Astrophysics</i> 527, 4. (2011): A76 - 177. http://hdl.handle.net/11427/35086en_ZA
dc.identifier.citationGentile, G., Famaey, B. & de Blok, W.J.G. 2011. THINGS about MOND. <i>Astronomy and Astrophysics.</i> 527(4):A76 - 177. http://hdl.handle.net/11427/35086en_ZA
dc.identifier.issn0004-6361
dc.identifier.issn1432-0746
dc.identifier.ris TY - Journal Article AU - Gentile, G AU - Famaey, B AU - de Blok, W J G AB - 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. DA - 2011 DB - OpenUCT DP - University of Cape Town IS - 4 J1 - Astronomy and Astrophysics LK - https://open.uct.ac.za PY - 2011 SM - 0004-6361 SM - 1432-0746 T1 - THINGS about MOND TI - THINGS about MOND UR - http://hdl.handle.net/11427/35086 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/35086
dc.identifier.vancouvercitationGentile G, Famaey B, de Blok WJG. THINGS about MOND. Astronomy and Astrophysics. 2011;527(4):A76 - 177. http://hdl.handle.net/11427/35086.en_ZA
dc.language.isoeng
dc.publisher.departmentDepartment of Astronomy
dc.publisher.facultyFaculty of Science
dc.sourceAstronomy and Astrophysics
dc.source.journalissue4
dc.source.journalvolume527
dc.source.paginationA76 - 177
dc.source.urihttps://dx.doi.org/10.1051/0004-6361/201015283
dc.subject.otherHUBBLE-SPACE-TELESCOPE
dc.subject.otherdark matter
dc.subject.otherAstrophysics - Cosmology and Nongalactic Astrophysics
dc.subject.otherDARK-MATTER HALOS
dc.subject.otherMODIFIED NEWTONIAN DYNAMICS
dc.subject.otherSTELLAR MASS
dc.subject.othergalaxies: kinematics and dynamics
dc.subject.othergalaxies: spiral
dc.subject.otherAstrophysics - Astrophysics of Galaxies
dc.subject.otherPhysics and Astronomy
dc.subject.otherEXTENDED ROTATION CURVES
dc.subject.othergravitation
dc.subject.otherEXTRAGALACTIC DISTANCE SCALE
dc.subject.otherTULLY-FISHER RELATION
dc.subject.otherSPIRAL GALAXIES
dc.subject.otherKEY PROJECT
dc.subject.otherLOW SURFACE BRIGHTNESS
dc.subject.otherGeneral Relativity and Quantum Cosmology
dc.titleTHINGS about MOND
dc.typeJournal Article
uct.type.publicationResearch
uct.type.resourceJournal Article
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