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http://hdl.handle.net/2289/7091Full metadata record
| DC Field | Value | Language |
|---|---|---|
| dc.contributor.author | Kaur, Karamveer | - |
| dc.contributor.author | Sridhar, S. | - |
| dc.date.accessioned | 2018-12-04T18:03:54Z | - |
| dc.date.available | 2018-12-04T18:03:54Z | - |
| dc.date.issued | 2018-12-01 | - |
| dc.identifier.citation | Astrophysical Journal, 2018, Vol. 867, p134 | en_US |
| dc.identifier.issn | 0004-637X | - |
| dc.identifier.issn | 1538-4357-(Online) | - |
| dc.identifier.uri | http://hdl.handle.net/2289/7091 | - |
| dc.description | Open Access | en_US |
| dc.description.abstract | We apply the Tremaine-Weinberg theory of dynamical friction to compute the orbital decay of a globular cluster (GC), on an initially circular orbit inside a cored spherical galaxy with isotropic stellar velocities. The retarding torque on the GC, T(rp) < 0 , is a function of its orbital radius rp . The torque is exerted by stars whose orbits are resonant with the GC's orbit, and given as a sum over the infinitely many possible resonances by the Lynden-Bell Kalnajs (LBK) formula. We calculate the LBK torque T(rp) and determine rp(t), for a GC of mass Mp = 2 x 10^5 M_sun and an Isochrone galaxy of core mass Mc = 4 x 10^8 M_sun and core radius b = 1000pc. (i) When rp > 300 pc many strong resonances are active and, as expected, T = T_C , the classical Chandrasekhar torque. (ii) For rp < 300 pc, T comes mostly from stars nearly co-rotating with the GC, trailing or leading it slightly; Trailing resonances exert stronger torques. (iii) As rp decreases the number and strength of resonances drop, so |T| also decreases, with |T| < 10^{-2} |T_C| at rp = r* = (Mp/Mc)^{1/5} b = 220 pc , a characteristic `filtering' radius. (iv) Many resonances cease to exist inside r* ; this includes all Leading and low-order Trailing ones. (v) The higher-order Trailing resonances inside r* are very weak, with |T| < 10^{-4} |T_C| at rp = 150 pc. (vi) Inspiral times for rp(t) to decay from 300 pc to r* far exceed 10 Gyr. | en_US |
| dc.language.iso | en | en_US |
| dc.publisher | IOP Sciences for The American Astronomical Society | en_US |
| dc.relation.uri | https://arxiv.org/abs/1810.00369 | en_US |
| dc.relation.uri | https://doi.org/10.3847/1538-4357/aaeacf | en_US |
| dc.rights | 2018, The American Astronomical Society | en_US |
| dc.subject | galaxies | en_US |
| dc.subject | dwarf–galaxies | en_US |
| dc.subject | kinematics and dynamics | en_US |
| dc.title | Stalling of Globular Cluster Orbits in Dwarf Galaxies | en_US |
| dc.type | Article | en_US |
| Appears in Collections: | Research Papers (A&A) | |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| 2018_ApJ_Vol.868_p134.pdf | Open Access | 1.16 MB | Adobe PDF | View/Open |
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