Scaling of the photon index vs. mass accretion rate correlation and estimate of black hole mass in M101 ULX-1

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Table 6

BH masses and distances.

Source	M_dyn^a (M_⊙)	i_orb^a (deg)	d^b (kpc)	M_scal (M_⊙)

XTE J1550-564^1,2,3	9.5±1.1	72±5	~6	10.7±1.5^c
H 1743-322⁴	~11	~70	~10	13.3±3.2^c
4U 1630–47⁵	...	≤70	~10–11	9.5±1.1
M101 ULX-1^6,7	3–1000	...	(6.4 ± 0.5) × 10³	≥ 3.2 × 10⁴
M101 ULX-1^7,8	3–1000	...	(7.4 ± 0.6) × 10³	≥ 4.3 × 10⁴

Notes.

^(a)

Dynamically determined BH mass and system inclination angle;

^(b)

source distance found in literature;

^(c)

scaling value found by ST09.

Reference. (1) Orosz et al. (2002); (2) Sánchez-Fernández et al. (1999); (3) Sobczak et al. 1999; (4) McClintock et al. (2009); (5) STS14; (6) Shappee & Stanek (2011); (7) Mukai et al. (2005); (8) Kelson et al. (1996).

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