2018ApJ...854..176V


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.21CEST15:56:03

2018ApJ...854..176V - Astrophys. J., 854, 176-176 (2018/February-3)

Optical counterparts of ultraluminous X-ray sources NGC 4559 X-10 and NGC 4395 ULX-1.

VINOKUROV A., FABRIKA S. and ATAPIN K.

Abstract (from CDS):

We study the optical counterparts of ultraluminous X-ray sources (ULXs) NGC 4559 X-10 and NGC 4395 ULX-1. Their absolute magnitudes, after taking reddening into account, are MV ≃ -5.3 and MV ≃ -6.2, respectively. The spectral energy distribution (SED) of the NGC 4559 X-10 counterpart is well fitted by a spectrum of an A-type star, whereas NGC 4395 ULX-1 has a blue power-law spectrum. Optical spectroscopy of NGC 4395 ULX-1 has shown a broad He II λ4686 emission, which puts this object in line with all of the other spectrally studied ULXs. Analyzing the absolute magnitudes of 16 well-studied ULX counterparts, we find that the intrinsically fainter counterparts with MV >= -5.5 have, on average, blackbody-like or power-law SEDs. In other ULX counterparts with MV <= -5.5, we may observe a power-law-like SED; the only one donor is in NGC 7793 P13 (the ULX-pulsar). One may suggest that as the original accretion rate decreases (but nevertheless remains supercritical), the optical luminosity of the wind becomes lower and the donor star might dominate. Using the Swift archival X-ray data for NGC 4395 ULX-1, we have found a period of 62.8 ± 2.3 days. The X-ray phase curve of the source is very similar to the precession curve of SS 433.

Abstract Copyright: © 2018. The American Astronomical Society. All rights reserved.

Journal keyword(s): accretion, accretion disks - X-rays: binaries - X-rays: individual: (NGC 4559 X-10, NGC 4395 ULX-1)

Simbad objects: 23

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Number of rows : 23

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 RX J031820.3-662911 UX? 03 18 20.00 -66 29 10.9           ~ 171 1
2 2E 756 ULX 03 18 22.00 -66 36 04.3   23.5 23.6     O9.5 192 3
3 [SST2011] J034555.61+680455.3 ULX 03 45 55.612 +68 04 55.29           ~ 141 1
4 [SST2011] J081929.00+704219.3 ULX 08 19 28.99 +70 42 19.4           ~ 158 2
5 [FK2005] 7 SNR 09 55 32.95 +69 00 33.6   23.87 23.89     ~ 80 1
6 NAME M81-ULS1 ULX 09 55 42.146 +69 03 36.51     21.67     ~ 33 0
7 [KCF2005] M82 G ULX 09 55 51.040 +69 40 45.49           ~ 167 1
8 RX J0957.9+6903 ULX 09 57 53.290 +69 03 48.20           ~ 200 4
9 2XMM J112021.0+125846 UX? 11 20 20.89 +12 58 46.0           ~ 10 0
10 [SST2011] J122601.44+333131.1 UX? 12 26 01.53 +33 31 30.6           ~ 33 1
11 RX J123551+27561 ULX 12 35 51.71 +27 56 04.1           ~ 60 1
12 NGC 4559 H2G 12 35 57.6399424117 +27 57 35.859639262   10.46 10.01     ~ 539 1
13 RX J123558+27577 UX? 12 35 58.56 +27 57 41.9           ~ 36 2
14 [FK2005] 23 ULX 13 29 38.62 +58 25 05.6           ~ 109 2
15 [FK2005] 25 ULX 14 03 19.63 -41 22 58.7           ~ 197 0
16 NAME NGC 5474-X1 UX? 14 04 59.74 +53 38 09.0           ~ 8 0
17 NAME NGC 5907 ULX ULX 15 15 58.60 +56 18 10.0           ~ 90 0
18 V* V1033 Sco HXB 16 54 00.137 -39 50 44.90   15.20 14.2 16.14   F5IV 1719 1
19 V* V821 Ara HXB 17 02 49.3810714542 -48 47 23.163091737 16.20 16.30 15.5     ~ 1784 0
20 SS 433 HXB 19 11 49.5645897701 +04 58 57.824087535   16.3 13.0     A7Ib: 1941 3
21 V* V404 Cyg HXB 20 24 03.820 +33 52 01.90 14.50 14.20 12.7     K0IV 1103 0
22 RX J2034.8+6009 UX? 20 34 52.30 +60 09 11.7           ~ 10 0
23 NAME NGC 7793 P13 ULX 23 57 50.90 -32 37 26.6           ~ 120 0

    Equat.    Gal    SGal    Ecl

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2020.10.21-15:56:03

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