J/MNRAS/474/2479 Orbital parameters of globular clusters (Balbinot+, 2018)
The devil is in the tails:
the role of globular cluster mass evolution on stream properties.
Balbinot E., Gieles M.
<Mon. Not. R. Astron. Soc., 474, 2479-2492 (2018)>
=2018MNRAS.474.2479B 2018MNRAS.474.2479B (SIMBAD/NED BibCode)
ADC_Keywords: Milky Way ; Clusters, globular ; Proper motions ; Morphology
Keywords: globular clusters: general - Galaxy: structure
Abstract:
We present a study of the effects of collisional dynamics on the
formation and detectability of cold tidal streams. A semi-analytical
model for the evolution of the stellar mass function was implemented
and coupled to a fast stellar stream simulation code, as well as the
synthetic cluster evolution code EMACSS for the mass evolution as a
function of a globular cluster orbit. We find that the increase in the
average mass of the escaping stars for clusters close to dissolution
has a major effect on the observable stream surface density. As an
example, we show that Palomar 5 would have undetectable streams (in an
SDSS-like survey) if it was currently three times more massive,
despite the fact that a more massive cluster loses stars at a higher
rate. This bias due to the preferential escape of low-mass stars is an
alternative explanation for the absence of tails near massive
clusters, than a dark matter halo associated with the cluster. We
explore the orbits of a large sample of Milky Way globular clusters
and derive their initial masses and remaining mass fraction. Using
properties of known tidal tails, we explore regions of parameter space
that favour the detectability of a stream. A list of high-probability
candidates is discussed.
Description:
We compiled a set of GCs from literature that has measured PMs. The
sample was further expanded by using UCAC-4 absolute PMs by Dambis
(2006A&AT...25..185D 2006A&AT...25..185D, Cat. J/other/A+AT/25.185); however, the
uncertainties in this catalogue can be significant. The complete
sample analysed here is shown in Table 1 where appropriate references
are given for each individual object.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 133 145 Summary of the orbital parameters obtained from
the sampling of positions and velocities for
the clusters in our sample
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See also:
J/other/A+AT/25.185 : globular clusters absolute proper motions (Dambis, 2006)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Name Name
10 A1 --- n_Name [*] * indicates clusters with
no proper motions
13- 18 F6.2 mas/yr pmRA ?=- Proper motion along RA, pmRA*cosDE
20- 23 F4.2 mas/yr e_pmRA ? rms uncertainty on pmRA
25- 30 F6.2 mas/yr pmDE ?=- Proper motion along DE
32- 35 F4.2 mas/yr e_pmDE ? rms uncertainty on pmDE
38- 43 F6.1 km/s Vlos ?=- LOS velocity
45- 48 F4.1 km/s e_Vlos ? rms uncertainty on Vlos
50- 56 F7.2 kpc Rapo Apocentre radius
58- 63 F6.2 kpc e_Rapo rms uncertainty on Rapo
65- 69 F5.2 kpc Rperi Pericentre radius distance
71- 75 F5.2 kpc e_Rperi rms uncertainty on Rperi
77- 80 F4.2 --- ecc Orbital eccentricity
82- 85 F4.2 --- e_ecc rms uncertainty on Ecc
87- 91 F5.2 10+5Msun Mi Initial mass
93- 96 F4.2 10+5Msun e_Mi rms uncertainty on Mi
98-101 F4.2 --- mu Remaining mass fraction in the cluster
103-106 F4.2 --- e_mu rms uncertainty on mu
108-111 F4.2 --- phi Orbital phase
113-116 F4.2 --- e_phi rms uncertainty on phi
118-123 F6.2 pc rJ Jacobi radius
125-129 F5.2 pc e_rJ rms uncertainty on rJ
131-133 A3 --- r_pmRA Proper motion references (1)
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Note (1): References as follows:
1 = Dinescu et al. (1997AJ....114.1014D 1997AJ....114.1014D)
2 = Dinescu et al. (1999AJ....117..277D 1999AJ....117..277D)
3 = Dinescu, Girard & van Altena (1999AJ....117.1792D 1999AJ....117.1792D)
4 = Dinescu et al. (2003AJ....125.1373D 2003AJ....125.1373D)
5 = Casetti-Dinescu et al. (2007AJ....134..195C 2007AJ....134..195C)
6 = Casetti-Dinescu et al. (2010AJ....140.1282C 2010AJ....140.1282C)
7 = Casetti-Dinescu et al. (2013AJ....146...33C 2013AJ....146...33C)
8 = Dambis (2006A&AT...25..185D 2006A&AT...25..185D, Cat. J/other/A+AT/25.185)
9 = Kuepper et al. (2015ApJ...803...80K 2015ApJ...803...80K)
10 = Rossi et al. (2015MNRAS.450.3270R 2015MNRAS.450.3270R)
11 = Scholz et al. (1996MNRAS.278..251S 1996MNRAS.278..251S)
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 23-Feb-2021