2018MNRAS.473.4360W


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.21CEST16:05:56

2018MNRAS.473.4360W - Mon. Not. R. Astron. Soc., 473, 4360-4376 (2018/February-1)

Super-Eddington accretion on to the neutron star NGC 7793 P13: Broad-band X-ray spectroscopy and ultraluminous X-ray sources.

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

Abstract (from CDS):

We present a detailed, broad-band X-ray spectral analysis of the ultraluminous X-ray source (ULX) pulsar NGC 7793 P13, a known super-Eddington source, utilizing data from the XMM-Newton, NuSTAR and Chandra observatories. The broad-band XMM-Newton+NuSTAR spectrum of P13 is qualitatively similar to the rest of the ULX sample with broad-band coverage, suggesting that additional ULXs in the known population may host neutron star accretors. Through time-averaged, phase-resolved and multi-epoch studies, we find that two non-pulsed thermal blackbody components with temperatures ∼0.5 and 1.5 keV are required to fit the data below 10 keV, in addition to a third continuum component which extends to higher energies and is associated with the pulsed emission from the accretion column. The characteristic radii of the thermal components appear to be comparable, and are too large to be associated with the neutron star itself, so the need for two components likely indicates the accretion flow outside the magnetosphere is complex. We suggest a scenario in which the thick inner disc expected for super-Eddington accretion begins to form, but is terminated by the neutron star's magnetic field soon after its onset, implying a limit of B <= 6 x 1012 G for the dipolar component of the central neutron star's magnetic field. Evidence of similar termination of the disc in other sources may offer a further means of identifying additional neutron star ULXs. Finally, we examine the spectrum exhibited by P13 during one of its unusual 'off' states. These data require both a hard power-law component, suggesting residual accretion on to the neutron star, and emission from a thermal plasma, which we argue is likely associated with the P13 system.

Abstract Copyright: © 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): stars: neutron - X-rays: binaries - X-rays: individual: NGC 7793 P13

Simbad objects: 15

goto Full paper

goto View the reference in ADS

Number of rows : 15

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 2XMM J034606.5+680705 ULX 03 46 07.3 +68 07 06           ~ 12 0
5 IC 342 SBG 03 46 48.514 +68 05 45.98   10.5       ~ 1395 1
6 [SST2011] J081929.00+704219.3 ULX 08 19 28.99 +70 42 19.4           ~ 158 2
7 NAME M82 ULX-1 UX? 09 55 50.01 +69 40 46.0           ~ 241 1
8 [KCF2005] M82 G ULX 09 55 51.040 +69 40 45.49           ~ 167 1
9 RX J0957.9+6903 ULX 09 57 53.290 +69 03 48.20           ~ 200 4
10 [FK2005] 23 ULX 13 29 38.62 +58 25 05.6           ~ 109 2
11 [WMR2006] Circinus XMM2 X 14 12 39.20 -65 23 34.3           ~ 9 0
12 [GRF2004] NGC 5643 X-1 UX? 14 32 41.9 -44 09 36           ~ 12 0
13 NAME NGC 5907 ULX ULX 15 15 58.60 +56 18 10.0           ~ 90 0
14 NGC 7793 GiG 23 57 49.7533807411 -32 35 27.708304655 10.26 9.74 9.28 9.06 9.7 ~ 936 2
15 NAME NGC 7793 P13 ULX 23 57 50.90 -32 37 26.6           ~ 120 0

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2018MNRAS.473.4360W and select 'bookmark this link' or equivalent in the popup menu


2020.10.21-16:05:56

© Université de Strasbourg/CNRS

    • Contact