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Table 2

XMM-Newton and Chandra measurements of M 31 optical nova candidates known from Paper I and still detected here.

Optical nova candidate X-ray measurements
Name RA   (h:m:s)a MJDb D c Observationd Δte L 50 f Commentg
M31N Dec (d:m:s)a (d) (″) ID (d) (1036 erg s-1)
1996-08b 0:42:55.20 50 307.0 0.8 mrg1 (HRC-I) 4104.6 4.1 ± 0.7 SSS
41:20:46.0 1.2 0505720201 (EPIC) 4156.6 2.5 ± 0.5
1.3 0505720301 (EPIC) 4166.3 2.4 ± 0.4
1.8 0505720401 (EPIC) 4176.6 2.5 ± 0.6
0.5 0505720501 (EPIC) 4185.9 2.4 ± 0.7
2.2 0505720601 (EPIC) 4196.2 2.8 ± 0.6
0.5 mrg2 (HRC-I) 4471.3 3.9 ± 0.6
2.3 0551690201 (EPIC) 4523.1 2.3 ± 0.5
2.3 0551690301 (EPIC) 4533.3 1.6 ± 0.5
0551690401 (EPIC) 4539.9  <4.7
0551690501 (EPIC) 4551.3  <3.9
1.2 0551690601 (EPIC) 4559.6 2.5 ± 1.3
1997-11a 0:42:42.13 50 753.0 0.3 8526 (HRC-I) 3658.6 3.5 ± 0.8 SSS-HR
41:15:10.5 0.4 8527 (HRC-I) 3668.8 3.4 ± 0.8
0.4 8528 (HRC-I) 3679.8 2.3 ± 0.8
0.5 8529 (HRC-I) 3688.6 6.0 ± 1.4
0.5 8530 (HRC-I) 3698.5 3.0 ± 0.9
0.5 mrg2 (HRC-I) 4025.3 0.6 ± 0.2
2001-10a 0:43:03.31 52 186.0 1.1 8526 (HRC-I) 2225.6 13.3 ± 2.2 SSS
41:12:11.5 1.0 8527 (HRC-I) 2235.8 10.4 ± 1.9
1.5 8528 (HRC-I) 2246.8 9.9 ± 1.9
1.9 8529 (HRC-I) 2255.6 9.8 ± 1.9
8530 (HRC-I) 2265.5  <9.8
1.0 0505720201 (EPIC) 2277.6 2.6 ± 0.4
0505720301 (EPIC) 2287.3  <4.8
0.7 0505720401 (EPIC) 2297.6 2.7 ± 0.6
1.6 0505720501 (EPIC) 2306.9 3.4 ± 0.9
1.8 0505720601 (EPIC) 2317.2 3.6 ± 0.7
1.5 9825 (HRC-I) 2592.3 7.0 ± 1.8
2.1 9826 (HRC-I) 2601.1 8.1 ± 1.7
0.6 9827 (HRC-I) 2612.2 11.3 ± 2.2
0.3 9828 (HRC-I) 2621.4 10.8 ± 2.1
0.9 9829 (HRC-I) 2632.0 11.9 ± 3.4
10838 (HRC-I) 2632.5  <20.4
0.7 0551690201 (EPIC) 2644.1 3.6 ± 0.6
1.7 0551690301 (EPIC) 2654.3 3.7 ± 0.7
0551690401 (EPIC) 2660.9  <6.1
0551690501 (EPIC) 2672.3  <4.0
1.1 0551690601 (EPIC) 2680.6 3.4 ± 0.9
1.4 10683 (HRC-I) 2692.9 7.3 ± 1.7
10684 (HRC-I) 2702.2  <11.8
2004-05b 0:42:37.04 53143.0 0.4 8526 (HRC-I) 1268.6 20.9 ± 2.3 SSS
41:14:28.5 0.4 8527 (HRC-I) 1278.8 47.9 ± 6.0
0.3 8528 (HRC-I) 1289.8 21.5 ± 2.6
0.3 8529 (HRC-I) 1298.6 24.8 ± 2.9
0.3 8530 (HRC-I) 1308.5 31.4 ± 3.4
1.4 0505720201 (EPIC) 1320.6 21.9 ± 0.9
1.2 0505720301 (EPIC) 1330.3 20.0 ± 0.9
1.1 0505720401 (EPIC) 1340.6 21.6 ± 1.0
1.2 0505720501 (EPIC) 1349.9 21.4 ± 1.3
1.0 0505720601 (EPIC) 1360.2 16.7 ± 1.0
0.3 9825 (HRC-I) 1635.3 19.5 ± 2.2
0.4 9826 (HRC-I) 1644.1 17.9 ± 2.2
0.4 9827 (HRC-I) 1655.2 25.4 ± 2.8
0.4 9828 (HRC-I) 1664.4 21.3 ± 2.6
0.4 9829 (HRC-I) 1675.0 19.9 ± 3.0
0.4 10838 (HRC-I) 1675.5 26.6 ± 3.9
1.2 0551690201 (EPIC) 1687.1 18.4 ± 1.0
0.8 0551690301 (EPIC) 1697.3 16.5 ± 1.0
0.6 0551690401 (EPIC) 1703.9 16.7 ± 1.9
1.2 0551690501 (EPIC) 1715.3 17.0 ± 1.0
0.6 0551690601 (EPIC) 1723.6 16.7 ± 1.2
0.7 10683 (HRC-I) 1735.9 33.9 ± 4.2
0.5 10684 (HRC-I) 1745.2 36.7 ± 4.6

Notes. 

(a)

RA, Dec are given in J2000.0;

(b)

modified Julian Date of optical outburst; MJD = JD – 2 400 000.5;

(c)

distance in arcsec between optical and X-ray source;

(d)

mrg1/2 (HRC-I/EPIC) indicates merged data of all HRC-I/EPIC observations during 2007/8 or 2008/9, mrg3 (HRC-I) indicates merged data of the Chandra observations 9829 and 10838 (taken on the same day);

(e)

time after observed start of optical outburst;

(f)

unabsorbed equivalent luminosity in the 0.2–10.0 keV band assuming a 50 eV blackbody spectrum with Galactic foreground absorption (luminosity errors are 1σ, upper limits are 3σ);

(g)

SSS or SSS-HR indicate X-ray sources classified as supersoft based on XMM-Newton spectra or Chandra hardness ratios, respectively.

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