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Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/3651
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dc.contributor.authorSanchez-Salcedo, F.J.-
dc.contributor.authorSaha, K.-
dc.contributor.authorNarayan, C.A.-
dc.date.accessioned2008-10-31T10:07:20Z-
dc.date.available2008-10-31T10:07:20Z-
dc.date.issued2008-02-
dc.identifier.citationMonthly Notices of the Royal Astronomical Society, 2008, Vol.385, p1585en
dc.identifier.issnE-ISSN: 1365-2966-
dc.identifier.issnP-ISSN: 0035-8711-
dc.identifier.urihttp://hdl.handle.net/2289/3651-
dc.descriptionRestricted Access. An open-access version is available at arXiv.org (one of the alternative locations)en
dc.description.abstractThe outskirts of galaxies are a very good laboratory for testing the nature of the gravitational field at low accelerations. By assuming that the neutral hydrogen gas is in hydrostatic equilibrium in the gravitational potential of the host galaxy, the observed flaring of the gas layer can be used to test modified gravities. For the first time, we construct a simple framework to derive the scaleheight of the neutral hydrogen gas disc in the MOdified Newtonian Dynamics (MOND) scenario and apply this to the Milky Way. It is shown that using a constant gas velocity dispersion of ~9 km s-1, MOND is able to give a very good fit to the observed HI flaring beyond a galactocentric distance of 17 kpc up to the last measured point (~40 kpc). Between 10 and 16 kpc, however, the observed scaleheight is about 40 per cent more than what MOND predicts for the standard interpolating function and 70 per cent for the form suggested by Famaey & Binney. Given the uncertainties in the non-thermal pressure support by cosmic rays and magnetic fields, MOND seems to be a plausible alternative to dark matter in explaining the Milky Way flaring. Studying the flaring of extended HI discs in external edge-on galaxies may be a promising approach to assess the viability of MOND.en
dc.format.extent256518 bytes-
dc.format.mimetypeapplication/pdf-
dc.language.isoenen
dc.publisherWiley Interscience for the RASen
dc.relation.urihttp://adsabs.harvard.edu/abs/2008MNRAS.385.1585Sen
dc.relation.urihttp://arxiv.org/abs/0712.0816en
dc.relation.urihttp://dx.doi.org/10.1111/j.1365-2966.2008.12941.xen
dc.rights2008 The Authors/RASen
dc.subjectgravitationen
dc.subjectGalaxy: discen
dc.subjectgalaxies: haloesen
dc.subjectgalaxies: kinematics and dynamicsen
dc.subjectgalaxies: structureen
dc.titleThe thickness of HI in galactic discs under MOdified Newtonian Dynamics: theory and application to the galaxyen
dc.typeArticleen
Appears in Collections:Research Papers (A&A)

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