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Query : 2004MNRAS.349..747P |
2004MNRAS.349..747P - Mon. Not. R. Astron. Soc., 349, 747-756 (2004/April-1)
Dynamical friction in flattened systems: a numerical test of Binney's approach.
PENARRUBIA J., JUST A. and KROUPA P.
Abstract (from CDS):
We find that Binney's approach successfully describes the overall satellite decay and orbital inclination decrease for the whole set of orbits, with an averaged discrepancy of less than 4 per cent in orbital radius during the first three orbits. If Chandrasekhar's expression is used instead, the discrepancy increases to 20 per cent. Binney's treatment therefore appears to provide a significantly improved treatment of dynamical friction in anisotropic systems.
The velocity anisotropy of the DMH velocity distribution function leads to a significant decrease with time of the inclination of non-polar satellite orbits. But, at the same time, it reduces the difference in decay times between polar and coplanar orbits evident in a flattened DMH when the anisotropic DMH velocity distribution function is not taken into account explicitly. Our N -body calculations furthermore indicate that polar orbits survive about 1.6 times longer than coplanar orbits and that the orbital eccentricity e remains close to its initial value if satellites decay slowly towards the galaxy centre. However, orbits of rapidly decaying satellites modelled with the semi-analytic code show a strong orbital circularization (e > O) not present in the N -body computations.
Abstract Copyright: 2004 RAS
Journal keyword(s): stellar dynamics - methods: analytical - methods: N -body simulations - galaxies: dwarf - galaxies: haloes - galaxies: kinematics and dynamics
Simbad objects: 15
Number of rows : 15 |
N | Identifier | Otype |
ICRS (J2000) RA |
ICRS (J2000) DEC |
Mag U | Mag B | Mag V | Mag R | Mag I | Sp type |
#ref
1850 - 2024 |
#notes |
---|---|---|---|---|---|---|---|---|---|---|---|---|
1 | 2MASX J01385522-0745553 | GiC | 01 38 55.2336829296 | -07 45 55.565640144 | 15.62 | ~ | 72 | 0 | ||||
2 | 2E 0150.5-1358 | ClG | 01 53 00.40 | -13 44 18.0 | ~ | 387 | 0 | |||||
3 | NGC 720 | Sy1 | 01 53 00.523 | -13 44 19.25 | 12.4 | 10.36 | ~ | 523 | 0 | |||
4 | NGC 891 | H2G | 02 22 32.907 | +42 20 53.95 | 11.08 | 10.81 | 9.93 | 7.86 | ~ | 1670 | 2 | |
5 | NGC 1332 | GiP | 03 26 17.321 | -21 20 07.33 | 11.45 | 9.84 | ~ | 351 | 0 | |||
6 | NGC 2841 | LIN | 09 22 02.6778711696 | +50 58 35.737082868 | 10.43 | 10.09 | 9.22 | ~ | 1073 | 1 | ||
7 | NGC 2905 | H2G | 09 32 10.111 | +21 30 02.99 | 10.44 | 9.75 | 9.07 | 8.68 | ~ | 1119 | 3 | |
8 | NGC 3198 | EmG | 10 19 54.990 | +45 32 58.88 | 10.83 | 10.87 | 10.33 | ~ | 906 | 1 | ||
9 | NGC 3923 | GiG | 11 51 01.783 | -28 48 22.36 | 11.41 | 10.59 | 9.80 | 8.88 | ~ | 439 | 1 | |
10 | NGC 4013 | GiG | 11 58 31.417 | +43 56 49.28 | 12.4 | ~ | 423 | 1 | ||||
11 | NGC 4244 | GiG | 12 17 29.659 | +37 48 25.60 | 10.71 | 9.99 | ~ | 558 | 1 | |||
12 | NGC 4565 | LIN | 12 36 20.804 | +25 59 14.61 | 13.61 | 12.43 | ~ | 958 | 0 | |||
13 | ESO 322-69 | Sy2 | 12 44 49.0352044176 | -40 42 51.691570488 | 14.12 | 13.58 | 13.29 | 13.9 | ~ | 197 | 0 | |
14 | NGC 4753 | GiG | 12 52 22.112 | -01 11 58.88 | 11.26 | 10.85 | 9.95 | ~ | 274 | 1 | ||
15 | LEDA 64612 | Sy2 | 20 23 54.9120351168 | -50 39 06.848951112 | 14.72 | 13.59 | ~ | 59 | 0 |
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