2018ApJ...856..128W


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.19CEST18:25:44

2018ApJ...856..128W - Astrophys. J., 856, 128-128 (2018/April-1)

Evidence for pulsar-like emission components in the broadband ULX sample.

WALTON D.J., FURST F., HEIDA M., HARRISON F.A., BARRET D., STERN D., BACHETTI M., BRIGHTMAN M., FABIAN A.C. and MIDDLETON M.J.

Abstract (from CDS):

We present broadband X-ray analyses of a sample of bright ultraluminous X-ray sources (ULX) with the goal of investigating the spectral similarity of this population to the known ULX pulsars, M82 X-2, NGC 7793 P13, and NGC 5907 ULX. We perform a phase-resolved analysis of the broadband XMM-Newton+NuSTAR data set of NGC 5907 ULX, finding that the pulsed emission from the accretion column in this source exhibits a similar spectral shape to that seen in both M82 X-2 and NGC 7793 P13, and that this is responsible for the excess emission observed at the highest energies when the spectra are fit with accretion disk models. We then demonstrate that similar "hard" excesses are seen in all ULXs in the broadband sample. Finally, for ULXs where the nature of the accretor is currently unknown, we test whether the hard excesses are all consistent with being produced by an accretion column similar to those present in M82 X-2, NGC 7793 P13, and NGC 5907 ULX. Based on the average shape of the pulsed emission, we find that in all cases a similar accretion column can successfully reproduce the observed data, consistent with the hypothesis that this ULX sample may be dominated by neutron star accretors. Compared to the known pulsar ULXs, our spectral fits for the remaining ULXs suggest that the non-pulsed emission from the accretion flow beyond the magnetosphere makes a stronger relative contribution than the component associated with the accretion column. If these sources do also contain neutron star accretors, this may help to explain the lack of detected pulsations.

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

Journal keyword(s): stars: neutron - X-rays: binaries - X-rays: individual: NGC 5907 ULX

Simbad objects: 14

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Number of rows : 14

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 [FWB2009] HLX-1 ULX 01 10 28.30 -46 04 22.3     24.5 23.80   ~ 156 1
2 RX J031820.3-662911 UX? 03 18 20.00 -66 29 10.9           ~ 171 1
3 [SST2011] J034555.61+680455.3 ULX 03 45 55.612 +68 04 55.29           ~ 141 1
4 2XMM J034606.5+680705 ULX 03 46 07.3 +68 07 06           ~ 12 0
5 [SST2011] J081929.00+704219.3 ULX 08 19 28.99 +70 42 19.4           ~ 158 2
6 NAME M82 ULX-1 UX? 09 55 50.01 +69 40 46.0           ~ 241 1
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 [FK2005] 23 ULX 13 29 38.62 +58 25 05.6           ~ 109 2
10 [JRW2005b] 122 UX? 14 03 32.38 +54 21 03.0   21.13       ~ 99 0
11 [WMR2006] Circinus XMM2 X 14 12 39.20 -65 23 34.3           ~ 9 0
12 NGC 5906 GiG 15 15 53.687 +56 19 43.86   11.4       ~ 689 1
13 NAME NGC 5907 ULX ULX 15 15 58.60 +56 18 10.0           ~ 90 0
14 NAME NGC 7793 P13 ULX 23 57 50.90 -32 37 26.6           ~ 120 0

    Equat.    Gal    SGal    Ecl

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2020.10.19-18:25:44

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