2009MNRAS.398L..21S

Query : 2009MNRAS.398L..21S

2009MNRAS.398L..21S - Mon. Not. R. Astron. Soc., 398, L21-L25 (2009/September-1)

Quantifying the heart of darkness with GHALO - a multibillion particle simulation of a galactic halo.

STADEL J., POTTER D., MOORE B., DIEMAND J., MADAU P., ZEMP M., KUHLEN M. and QUILIS V.

Abstract (from CDS):

We perform a series of simulations of a Galactic mass dark matter halo at different resolutions: our largest uses over 3 billion particles and has a mass resolution of 1000M_☉. We quantify the structural properties of the inner dark matter distribution and study how they depend on numerical resolution. We can measure the density profile to a distance of 120 pc (0.05 per cent of R_vir), where the logarithmic slope is -0.8 and -1.4 at (0.5 per cent of R_vir). We propose a new two-parameter fitting function that has a linearly varying logarithmic density gradient over the resolved radii which fits the GHALO and VL2 density profiles extremely well. Convergence in the halo shape is achieved at roughly three times the convergence radius for the density profile at which point the halo becomes more spherical due to numerical resolution. The six-dimensional phase-space profile is dominated by the presence of the substructures and does not follow a power law, except in the central few kpc which is devoid of substructure even at this resolution. The quantity, ρ/σ³, which is often used as a proxy for the six-dimensional phase-space density should be used with caution.

Journal keyword(s): methods: {em N}-body simulations - methods: numerical - galaxies: clusters: general - galaxies: haloes - dark matter

Simbad objects: 1

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Number of rows : 1

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Mag I	Sp type	#ref 1850 - 2026	#notes
1	UGCA 275	G	12 14 59.677	+09 33 54.51		18				~	28	1

Query : 2009MNRAS.398L..21S

Basic data :

UGCA 275 -- Galaxy

G (2015ApJS,UGCA,...), Opt (SDSS)

12 14 59.677 +09 33 54.51 (Optical) [ 135 112 90 ] C 2009ApJS..182..543A

12 12 26.605 +09 50 34.89 [ 135 112 90 ]

275.126458 +70.443711 [ 135 112 90 ]

V(km/s) 8998 [57] / z(spectroscopic) 0.03048 [0.00019] / cz 9137.7 [57.0] (Opt) C 2009ApJS..182..543A

dSphun C 2015ApJS..217...27A

0.535883 0.454804 59 (Opt) B 2023ApJS..269....3M

B 18 [~] E ~

u (AB) 18.1 [0.1] E 2009ApJS..182..543A

g (AB) 16.9823 [0.0022] B 2023ApJS..269....3M

r (AB) 16.3573 [0.0017] B 2023ApJS..269....3M

i (AB) 15.79 [0.01] D 2009ApJS..182..543A

z (AB) 15.9792 [0.0034] B 2023ApJS..269....3M

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`UGCA 275`	`GRDG 11`	`LEDA 39146`	`VCC 128`
`GRDG +09 3`	`K68 91`	`SDSS J121459.67+093354.5`	`[PYY2023] J121459+093355`

References (28 between 1850 and 2026) (Total 28)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).

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Data at NED - NASA/IPAC Extragalactic Database : UGCA 275

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SDSS J121459.67+093354.5

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