Properties of the brightest globular cluster in M 81 based on multicolour observations

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Table 5.

Structural parameters of GC1 in M 81.

Band	N_pts^(a)	Model	^(b)	I_bkg^(c)	W₀^(d)	c/n^(e)	μ₀^(f)	r₀^(g)	R_c^(h)	R_h⁽ⁱ⁾	r_t^(j)
							(L_⊙ pc⁻²)		(pc)	(pc)	(pc)
(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)	(11)	(12)
F606W	49	K66	47.90	54.50 ± 5.80
...	49	W	12.88	44.50 ± 4.46
...	49	S	37.14	52.60 ± 3.36	…						∞
F814W	49	K66	67.79	157.80 ± 10.76
...	49	W	58.61	144.60 ± 14.87
...	49	S	47.49	157.20 ± 5.64	…						∞

Notes.

^(a)

The number of points in the intensity profile that were used to constrain the model fits.

^(b)

The minimum χ² obtained in the fits.

^(c)

The best-fitted background intensity.

^(d)

The dimensionless central potential of the best fitting model, defined as .

^(e)

The concentration of c ≡ log(r_t/r₀).

^(f)

The best-fit central surface brightness.

^(g)

The best model-fit scale radius r₀ in parsecs.

^(h)

The projected core radius of a model R_c in parsecs.

⁽ⁱ⁾

The projected half-light or effective radius of a model R_h in parsecs.

^(j)

The model tidal radius r_t in parsecs.

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