The dynamics of the bulge dominated galaxy NGC 7814 in MOND

G. W. Angus, K. J. Van Der Heyden, A. Diaferio

    Research output: Contribution to journalArticle

    2 Citations (Scopus)

    Abstract

    Context. The bulge dominated galaxy NGC 7814 provides one of the strongest dynamical tests possible for MOdified Newtonian Dynamics (MOND). Spitzer 3.6 μm photometry fixes the bulge parameterisation and strongly constrains the properties of the subdominant stellar disk. Furthermore, the distance is known to better than 5%, virtually eliminating it as a free parameter. The rotation curve is easily measured, since the H I (and stellar) disks are edge on, and both the receding and approaching sides agree very well. Aims. We explore the agreement between the model and observed rotation curves in MOND given that the only two free parameters available are the mass-to-light ratios of the bulge and disk. Methods. We use a grid based MOND Poisson solver that accurately solves for the MOND gravity and produces our model rotation curves from a given mass distribtion. The input to the Poisson solver is a 3D distribution of N particles which is generated from modelling the observed distribution of stars and gas in the galaxy. Results. By ensuring a superior fit to the radial surface brightness profile than previous works, by virtue of a double Sérsic fit to the bulge, we were able to produce excellent fits to the rotation curve with typical values for both mass-to-light ratios. Conclusions. The model rotation curve of a mass distribution in MOND is extremely sensitive to the bulge-disk decomposition and even slight deviation from the observed mass distribution can produce large differences in the model rotation curve.

    Original languageEnglish
    Article numberA76
    JournalAstronomy and Astrophysics
    Volume543
    DOIs
    Publication statusPublished - 2012

    Fingerprint

    galaxies
    curves
    mass to light ratios
    mass distribution
    parameterization
    fixing
    photometry
    brightness
    grids
    decomposition
    gravity
    gravitation
    deviation
    stars
    distribution
    profiles
    gases
    gas
    modeling
    parameter

    All Science Journal Classification (ASJC) codes

    • Astronomy and Astrophysics
    • Space and Planetary Science

    Cite this

    Angus, G. W. ; Van Der Heyden, K. J. ; Diaferio, A. / The dynamics of the bulge dominated galaxy NGC 7814 in MOND. In: Astronomy and Astrophysics. 2012 ; Vol. 543.
    @article{a26a28bb3e854551af98c2f15bfaf1f6,
    title = "The dynamics of the bulge dominated galaxy NGC 7814 in MOND",
    abstract = "Context. The bulge dominated galaxy NGC 7814 provides one of the strongest dynamical tests possible for MOdified Newtonian Dynamics (MOND). Spitzer 3.6 μm photometry fixes the bulge parameterisation and strongly constrains the properties of the subdominant stellar disk. Furthermore, the distance is known to better than 5{\%}, virtually eliminating it as a free parameter. The rotation curve is easily measured, since the H I (and stellar) disks are edge on, and both the receding and approaching sides agree very well. Aims. We explore the agreement between the model and observed rotation curves in MOND given that the only two free parameters available are the mass-to-light ratios of the bulge and disk. Methods. We use a grid based MOND Poisson solver that accurately solves for the MOND gravity and produces our model rotation curves from a given mass distribtion. The input to the Poisson solver is a 3D distribution of N particles which is generated from modelling the observed distribution of stars and gas in the galaxy. Results. By ensuring a superior fit to the radial surface brightness profile than previous works, by virtue of a double S{\'e}rsic fit to the bulge, we were able to produce excellent fits to the rotation curve with typical values for both mass-to-light ratios. Conclusions. The model rotation curve of a mass distribution in MOND is extremely sensitive to the bulge-disk decomposition and even slight deviation from the observed mass distribution can produce large differences in the model rotation curve.",
    author = "Angus, {G. W.} and {Van Der Heyden}, {K. J.} and A. Diaferio",
    year = "2012",
    doi = "10.1051/0004-6361/201219189",
    language = "English",
    volume = "543",
    journal = "Astronomy and Astrophysics",
    issn = "0004-6361",
    publisher = "EDP Sciences",

    }

    The dynamics of the bulge dominated galaxy NGC 7814 in MOND. / Angus, G. W.; Van Der Heyden, K. J.; Diaferio, A.

    In: Astronomy and Astrophysics, Vol. 543, A76, 2012.

    Research output: Contribution to journalArticle

    TY - JOUR

    T1 - The dynamics of the bulge dominated galaxy NGC 7814 in MOND

    AU - Angus, G. W.

    AU - Van Der Heyden, K. J.

    AU - Diaferio, A.

    PY - 2012

    Y1 - 2012

    N2 - Context. The bulge dominated galaxy NGC 7814 provides one of the strongest dynamical tests possible for MOdified Newtonian Dynamics (MOND). Spitzer 3.6 μm photometry fixes the bulge parameterisation and strongly constrains the properties of the subdominant stellar disk. Furthermore, the distance is known to better than 5%, virtually eliminating it as a free parameter. The rotation curve is easily measured, since the H I (and stellar) disks are edge on, and both the receding and approaching sides agree very well. Aims. We explore the agreement between the model and observed rotation curves in MOND given that the only two free parameters available are the mass-to-light ratios of the bulge and disk. Methods. We use a grid based MOND Poisson solver that accurately solves for the MOND gravity and produces our model rotation curves from a given mass distribtion. The input to the Poisson solver is a 3D distribution of N particles which is generated from modelling the observed distribution of stars and gas in the galaxy. Results. By ensuring a superior fit to the radial surface brightness profile than previous works, by virtue of a double Sérsic fit to the bulge, we were able to produce excellent fits to the rotation curve with typical values for both mass-to-light ratios. Conclusions. The model rotation curve of a mass distribution in MOND is extremely sensitive to the bulge-disk decomposition and even slight deviation from the observed mass distribution can produce large differences in the model rotation curve.

    AB - Context. The bulge dominated galaxy NGC 7814 provides one of the strongest dynamical tests possible for MOdified Newtonian Dynamics (MOND). Spitzer 3.6 μm photometry fixes the bulge parameterisation and strongly constrains the properties of the subdominant stellar disk. Furthermore, the distance is known to better than 5%, virtually eliminating it as a free parameter. The rotation curve is easily measured, since the H I (and stellar) disks are edge on, and both the receding and approaching sides agree very well. Aims. We explore the agreement between the model and observed rotation curves in MOND given that the only two free parameters available are the mass-to-light ratios of the bulge and disk. Methods. We use a grid based MOND Poisson solver that accurately solves for the MOND gravity and produces our model rotation curves from a given mass distribtion. The input to the Poisson solver is a 3D distribution of N particles which is generated from modelling the observed distribution of stars and gas in the galaxy. Results. By ensuring a superior fit to the radial surface brightness profile than previous works, by virtue of a double Sérsic fit to the bulge, we were able to produce excellent fits to the rotation curve with typical values for both mass-to-light ratios. Conclusions. The model rotation curve of a mass distribution in MOND is extremely sensitive to the bulge-disk decomposition and even slight deviation from the observed mass distribution can produce large differences in the model rotation curve.

    UR - http://www.scopus.com/inward/record.url?scp=84863197705&partnerID=8YFLogxK

    UR - http://www.scopus.com/inward/citedby.url?scp=84863197705&partnerID=8YFLogxK

    U2 - 10.1051/0004-6361/201219189

    DO - 10.1051/0004-6361/201219189

    M3 - Article

    VL - 543

    JO - Astronomy and Astrophysics

    JF - Astronomy and Astrophysics

    SN - 0004-6361

    M1 - A76

    ER -