2021RNAAS...5...47R

Query : 2021RNAAS...5...47R

2021RNAAS...5...47R - Research Notes of the AAS, 5, 47 (2021/March-0)

No Black Holes in NGC 6397.

RUI N.Z., WEATHERFORD N.C., KREMER K., CHATTERJEE S., FRAGIONE G., RASIO F.A., RODRIGUEZ C.L. and YE C.S.

Abstract (from CDS):

Recently, Vitral & Mamon detected a central concentration of dark objects in the core-collapsed globular cluster NGC 6397, which could be interpreted as a subcluster of stellar-mass black holes. However, it is well established theoretically that any significant number of black holes in the cluster would provide strong dynamical heating and is fundamentally inconsistent with this cluster's core-collapsed profile. Claims of intermediate-mass black holes in core-collapsed clusters should similarly be treated with suspicion, for reasons that have been understood theoretically for many decades. Instead, the central dark population in NGC 6397 is exactly accounted for by a compact subsystem of white dwarfs (WDs), as we demonstrate here by inspection of a previously published model that provides a good fit to this cluster. These central WD subclusters are in fact a generic feature of core-collapsed clusters, while central black hole subclusters are present in all non-collapsed clusters.

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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	NGC 6397	GlC	17 40 42.09	-53 40 27.6			5.17			~	2103	0

Query : 2021RNAAS...5...47R

Basic data :

NGC 6397 -- Globular Cluster

GlC (2013A&A,GCl), Cl* (C,[KPS2012])

17 40 42.09 -53 40 27.6 (Optical) [ ] D 2010AJ....140.1830G

17 36 37.84 -53 38 53.5 [ ]

338.16501 -11.95952 [ ]

3.30 -17.60 [0.01 0.01 90] C 2019MNRAS.482.5138B

V(km/s) 18.4 [0.1] / z(spectroscopic) 0.000061 [0.000000] / cz 18.40 [0.10] (Opt) A 2018MNRAS.478.1520B

0.416 [0.010] C 2021MNRAS.505.5978V

25.7 25.7 90 (Opt) D 1989Sci...246.1066D

V 5.17 [~] D 2012AJ....144..126D

K 3.29 [~] D 2008MNRAS.389.1924F

z (AB) 5.450 [0.044] C 2014MNRAS.437.1725V

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NGC 6397 C 1736-536 GCl 74 [KPS2012] MWSC 2662

References (2103 between 1850 and 2026) (Total 2103)
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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