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NGC 300 ULX1: A new ULX pulsar in NGC 300

Published online by Cambridge University Press:  30 December 2019

Chandreyee Maitra Open the ORCID record for Chandreyee Maitra [Opens in a new window] ,
Stefania Carpano Open the ORCID record for Stefania Carpano [Opens in a new window] ,
Frank Haberl  and
Georgios Vasilopoulos
Chandreyee Maitra
Affiliation:
Max-Planck-Institut für extraterrestrische Physik, Giessenbachstraße 1, 85748 Garching, Germany
Stefania Carpano
Affiliation:
Max-Planck-Institut für extraterrestrische Physik, Giessenbachstraße 1, 85748 Garching, Germany
Frank Haberl
Affiliation:
Max-Planck-Institut für extraterrestrische Physik, Giessenbachstraße 1, 85748 Garching, Germany
Georgios Vasilopoulos
Affiliation:
Max-Planck-Institut für extraterrestrische Physik, Giessenbachstraße 1, 85748 Garching, Germany
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Abstract

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. NGC 300 ULX1 is the fourth to be discovered in the class of the ultra-luminous X-ray pulsars. Pulsations from NGC 300 ULX1 were discovered during simultaneous XMM-Newton / NuSTAR observations in Dec. 2016. The period decreased from 31.71 s to 31.54 s within a few days, with a spin-up rate of –5.56×10–7 s s–1, likely one of the largest ever observed from an accreting neutron star. Archival Swift and NICER observations revealed that the period decreased exponentially from ~45 s to ~17.5 s over 2.3 years. The pulses are highly modulated with a pulsed fraction strongly increasing with energy and reaching nearly 80% at energies above 10 keV. The X-ray spectrum is described by a power-law and a disk black-body model, leading to a 0.3–30 keV unabsorbed luminosity of 4.7×1039 erg s–1. The spectrum from an archival XMM-Newton observation of 2010 can be explained by the same model, however, with much higher absorption. This suggests, that the intrinsic luminosity did not change much since that epoch. NGC 300 ULX1 shares many properties with supergiant high mass X-ray binaries, however, at an extreme accretion rate.

Keywords

starsneutron – pulsarsindividualNGC 300 ULX1 – galaxiesindividualNGC 300 – X-raysbinaries
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S346: High-mass X-ray Binaries: Illuminating the Passage from Massive Binaries to Merging Compact Objects , August 2018 , pp. 242 - 246
Copyright
© International Astronomical Union 2019 

Footnotes

†

Present address: Yale Department of Astronomy P.O. Box 208101, New Haven, CT 06520-8101, USA

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