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The dark matter distribution in the spiral NGC 3198 out to 0.22 R-vir

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Abstract
Aims. We use recent very extended HI kinematics (out to 48 kpc) along with previous H alpha kinematics of the spiral galaxy NGC 3198 in order to derive its distribution of dark matter (DM). Methods. First, we used a chi-square method to model the rotation curve (RC) of this galaxy in terms of different profiles of its DM distribution: the universal RC (URC) mass model (stellar disk + Burkert halo + gaseous disk), the NFW mass model (stellar disk + NFW halo + gaseous disk) and the baryon Lambda CDM mass model (stellar disk + NFW halo modified by baryonic physics + gaseous disk). Second, to derive the DM halo density distribution, we applied a new method that does not require a global and often uncertain mass modelling. Results. While according to the standard method, both URC and NFW mass models can account for the RC, the new method instead leads to a density profile that is sharply disagrees with the dark halo density distribution predicted within the Lambda cold dark matter (Lambda CDM) scenario. We find that the effects of baryonic physics modify the original Lambda CDM halo densities in such a way that the resulting profile is more compatible with the DM density of NGC 3198 derived using our new method. However, at large distances, r similar to 25 kpc, also this modified baryon Lambda CDM halo profile appears to create a tension with the derived DM halo density.
Keywords
CONSTANT, KINEMATICS, DENSITY PROFILES, MASS MODELS, HALOS, NGC-3198, SURFACE BRIGHTNESS GALAXIES, RESOLUTION ROTATION CURVES, galaxies: kinematics and dynamics, galaxies: spiral, RANGE, dark matter

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MLA
Karukes, EV, P Salucci, and Gianfranco Gentile. “The Dark Matter Distribution in the Spiral NGC 3198 Out to 0.22 R-vir.” ASTRONOMY & ASTROPHYSICS 578 (2015): n. pag. Print.
APA
Karukes, E., Salucci, P., & Gentile, G. (2015). The dark matter distribution in the spiral NGC 3198 out to 0.22 R-vir. ASTRONOMY & ASTROPHYSICS, 578.
Chicago author-date
Karukes, EV, P Salucci, and Gianfranco Gentile. 2015. “The Dark Matter Distribution in the Spiral NGC 3198 Out to 0.22 R-vir.” Astronomy & Astrophysics 578.
Chicago author-date (all authors)
Karukes, EV, P Salucci, and Gianfranco Gentile. 2015. “The Dark Matter Distribution in the Spiral NGC 3198 Out to 0.22 R-vir.” Astronomy & Astrophysics 578.
Vancouver
1.
Karukes E, Salucci P, Gentile G. The dark matter distribution in the spiral NGC 3198 out to 0.22 R-vir. ASTRONOMY & ASTROPHYSICS. 2015;578.
IEEE
[1]
E. Karukes, P. Salucci, and G. Gentile, “The dark matter distribution in the spiral NGC 3198 out to 0.22 R-vir,” ASTRONOMY & ASTROPHYSICS, vol. 578, 2015.
@article{7059882,
  abstract     = {Aims. We use recent very extended HI kinematics (out to 48 kpc) along with previous H alpha kinematics of the spiral galaxy NGC 3198 in order to derive its distribution of dark matter (DM). 
Methods. First, we used a chi-square method to model the rotation curve (RC) of this galaxy in terms of different profiles of its DM distribution: the universal RC (URC) mass model (stellar disk + Burkert halo + gaseous disk), the NFW mass model (stellar disk + NFW halo + gaseous disk) and the baryon Lambda CDM mass model (stellar disk + NFW halo modified by baryonic physics + gaseous disk). Second, to derive the DM halo density distribution, we applied a new method that does not require a global and often uncertain mass modelling. 
Results. While according to the standard method, both URC and NFW mass models can account for the RC, the new method instead leads to a density profile that is sharply disagrees with the dark halo density distribution predicted within the Lambda cold dark matter (Lambda CDM) scenario. We find that the effects of baryonic physics modify the original Lambda CDM halo densities in such a way that the resulting profile is more compatible with the DM density of NGC 3198 derived using our new method. However, at large distances, r similar to 25 kpc, also this modified baryon Lambda CDM halo profile appears to create a tension with the derived DM halo density.},
  articleno    = {A13},
  author       = {Karukes, EV and Salucci, P and Gentile, Gianfranco},
  issn         = {0004-6361},
  journal      = {ASTRONOMY & ASTROPHYSICS},
  keywords     = {CONSTANT,KINEMATICS,DENSITY PROFILES,MASS MODELS,HALOS,NGC-3198,SURFACE BRIGHTNESS GALAXIES,RESOLUTION ROTATION CURVES,galaxies: kinematics and dynamics,galaxies: spiral,RANGE,dark matter},
  language     = {eng},
  pages        = {8},
  title        = {The dark matter distribution in the spiral NGC 3198 out to 0.22 R-vir},
  url          = {http://dx.doi.org/10.1051/0004-6361/201425339},
  volume       = {578},
  year         = {2015},
}

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