2009ApJ...692..443S


C.D.S. - SIMBAD4 rel 1.7 - 2020.08.10CEST01:21:58

2009ApJ...692..443S - Astrophys. J., 692, 443-458 (2009/February-2)

The X-ray point-source population of NGC 1365: the puzzle of two highly-variable ultraluminous X-ray sources.

STRATEVA I.V. and KOMOSSA S.

Abstract (from CDS):

We present 26 point-sources discovered with Chandra within 200'' (~20 kpc) of the center of the barred supergiant galaxy NGC 1365. The majority of these sources are high-mass X-ray binaries, containing a neutron star or a black hole accreting from a luminous companion at a sub-Eddington rate. Using repeat Chandra and XMM-Newton, as well as optical observations, we discuss in detail the natures of two highly variable ultraluminous X-ray sources (ULXs): NGC 1365 X1, one of the most luminous ULXs known since the ROSAT era, which is X-ray variable by a factor of 30, and NGC 1365 X2, a newly discovered transient ULX, variable by a factor of >90. Their maximum X-ray luminosities ((3-5)x1040 erg/s, measured with Chandra) and multiwavelength properties suggest the presence of more exotic objects and accretion modes: accretion onto intermediate mass black holes (IMBHs) and beamed/super-Eddington accretion onto solar-mass compact remnants. We argue that these two sources have black hole masses higher than those of the typical primaries found in X-ray binaries in our Galaxy (which have masses of <20 M), with a likely black-hole mass of 40-60 M in the case of NGC 1365 X1 with a beamed/super-Eddington accretion mode, and a possible IMBH in the case of NGC 1365 X2 with M = 80-500 M.

Abstract Copyright:

Journal keyword(s): galaxies: individual: NGC 1365 - X-rays: binaries - X-rays: galaxies

Nomenclature: Table 1: [SK2009] XNN (Nos X1-X26).

Simbad objects: 33

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Number of rows : 33

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 [SK2009] X3 X 03 33 21.15 -36 08 15.1           ~ 1 0
2 [SK2009] X4 X 03 33 23.11 -36 07 53.1           ~ 2 0
3 [SK2009] X5 X 03 33 26.03 -36 08 38.3           ~ 1 0
4 [SK2009] X6 X 03 33 26.28 -36 08 49.6           ~ 1 0
5 [SK2009] X7 X 03 33 26.64 -36 08 13.9           ~ 1 0
6 [SK2009] X8 X 03 33 29.63 -36 08 29.9           ~ 1 0
7 [SK2009] X9 X 03 33 29.64 -36 07 56.1           ~ 1 0
8 [SK2009] X10 X 03 33 30.38 -36 08 21.5           ~ 1 0
9 [SK2009] X11 X 03 33 31.09 -36 08 07.7           ~ 1 0
10 [SK2009] X12 X 03 33 31.59 -36 08 08.7           ~ 1 0
11 [SK2009] X13 X 03 33 32.22 -36 06 42.8           ~ 2 0
12 [SK2009] X14 X 03 33 32.37 -36 09 02.9           ~ 1 0
13 [SK2009] X15 X 03 33 34.16 -36 11 02.5           ~ 2 0
14 RX J0333.5-3609 ULX 03 33 34.60 -36 09 35.0           ~ 18 0
15 [SK2009] X16 X 03 33 36.45 -36 09 58.0           ~ 1 0
16 NGC 1365 Sy1 03 33 36.458 -36 08 26.37 10.48 10.08 9.63 8.79 9.7 ~ 1531 2
17 [SK2009] X17 X 03 33 37.25 -36 10 26.2           ~ 1 0
18 [SK2009] X25 X 03 33 37.33 -36 07 23.1           ~ 1 0
19 3XMM J033337.9-360935 UX? 03 33 38.02 -36 09 35.2           ~ 2 0
20 [SK2009] X19 X 03 33 39.21 -36 10 01.9           ~ 1 0
21 [SK2009] X20 X 03 33 39.75 -36 10 37.3           ~ 1 0
22 [SK2009] X21 X 03 33 40.28 -36 07 26.7           ~ 1 0
23 [SK2009] X2 ULX 03 33 41.85 -36 07 31.4           ~ 7 0
24 [SK2009] X22 X 03 33 41.94 -36 07 41.3           ~ 1 0
25 [SK2009] X26 X 03 33 44.29 -36 07 17.7           ~ 1 0
26 [SK2009] X23 X 03 33 44.48 -36 09 58.3           ~ 2 0
27 [SK2009] X24 X 03 33 49.65 -36 10 25.6           ~ 1 0
28 MCG-03-34-063 Sy2 13 22 19.054 -16 42 30.09   14   13.77   ~ 46 3
29 NGC 5204 LSB 13 29 36.508 +58 25 07.43   11.84   11.37   ~ 422 0
30 V* V4641 Sgr HXB 18 19 21.6342721789 -25 24 25.849323550     13.654   13.092 B9III 388 1
31 SS 433 HXB 19 11 49.5645897701 +04 58 57.824087535   16.3 13.0     A7Ib: 1936 3
32 Granat 1915+105 LXB 19 15 11.54938 +10 56 44.7585           ~ 2290 0
33 V* V1521 Cyg HXB 20 32 25.78 +40 57 27.9           WN4/5-6/7 1767 2

    Equat.    Gal    SGal    Ecl

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2020.08.10-01:21:58

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