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Table 4

Best-fit parameters of the spectra using Chandra observations of M101 ULX-1 in the 0.3–7 keV energy range.

ObsID MJD, day Exp, ks Counts kTs, keV Γbmc = αbmc + 1 log A N bmc † (d.o.f.), MC††
934 51 629 94 8642 100±21 2.78±0.08 –3.78(9) 35.2(3) 0.99 (28)
2065 51 846 10 310 67±10 2.6±0.1 –2.36(8) 18.9(1) 1.08 (10)
4731* 53 023 56 26 46±10 1.39±0.07 –2.1(5) 2.2(1) 0.89
5297* 53 028 15 14 42±9 1.38±0.04 –2.0(6) 2.3(2) 0.78
5300* 53 071 52 13 43±8 1.38±0.05 –2.0(6) 2.2(1) 0.99
5309* 53 078 71 18 44±9 1.37±0.06 –2.0(5) 2.1(1) 0.98
4732* 53 083 70 12 42±8 1.38±0.04 –2.0(3) 2.1(1) 0.91
5322* 53 128 65 17 45±10 1.39±0.08 –2.0(5) 2.2(1) 0.93
4733* 53 132 16 12 41±7 1.36±0.07 –2.0(4) 2.1(1) 0.85
5323* 53 134 43 10 40±10 1.35±0.09 –2.5(2) 2.0(1) 0.82
5337 53 191 10 129 70±12 1.65±0.09 –3.32(9) 4.6(2) 0.97 (12)
5338 53 192 28 162 98±25 1.89±0.07 –2.93(8) 6.3(1) 1.00 (30)
5339 53 193 14 468 65±14 1.97±0.1 –4.18(6) 6.9(1) 1.08 (20)
5340 53 194 54 680 51±3 2.72±0.09 –2.4(3) 30.6(3) 1.21 (23)
4734 53 197 35 582 60±9 2.12±0.06 –3.9(4) 8.7(1) 1.25 (14)
4736* 53 310 78 29 45±8 1.36±0.07 –2.4(2) 2.0(1) 0.89
6152* 53 316 44 21 43±9 1.36±0.08 –2.4(3) 2.1(2) 0.96
6170 53 361 48 41 47±12 1.5±0.1 –2.0(1) 3.1(5) 0.6 (5)
6175 53 363 41 54 45±10 1.9±0.3 –3.7(1) 5.7(1) 0.78 (6)
6169 53 369 29 613 71±5 2.1±0.1 –4.1(2) 8.1(1) 1.12 (20)
4737 53 371 20 1483 95±7 2.75±0.06 –3.9(1) 26.7(1) 1.08 (54)
Comb.LH** ... 500 172 45±10 1.39±0.08 –2.0(5) 2.2(1) 0.93 (10)

Notes. Parameter errors correspond to 90% confidence level. The spectral model is phabs*BMC, where NH is 3 × 1021 cm-2 as a best-fit neutral absorption obtained for both Chandra and Swift spectra for the low/hard and high/soft states.

(†)

Normalization parameters of BMC component is in units of erg/s/kpc2, where L35 is the source luminosity in units of 1035 erg s-1, is the distance to the source in units of 10 kpc;

(††)

for the low state data, we fit the spectrum using CASH statistic. In this case the goodness-of-fit is determined by Monte-Carlo simulations.

(*)

LH state data collected during MJD 53 023–53 134 and 53 310–53 316 (January–May and November 2004 observations).

(**)

Combined LH state data accumulated during the aforementioned observations.

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