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Vertical distribution of HMXBs in NGC 55: Constraining their centre of mass velocity

Published online by Cambridge University Press:  30 December 2019

Babis Politakis ,
Andreas Zezas ,
Jeff J. Andrews  and
Stephen J. Williams
Babis Politakis
Affiliation:
University of Crete, Department of Physics, Heraklion 71003, Greece
Andreas Zezas
Affiliation:
University of Crete, Department of Physics, Heraklion 71003, Greece Foundation for Research and Technology - Hellas (FORTH), Heraklion 71003, Greece Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138
Jeff J. Andrews
Affiliation:
Foundation for Research and Technology - Hellas (FORTH), Heraklion 71003, Greece
Stephen J. Williams
Affiliation:
Foundation for Research and Technology - Hellas (FORTH), Heraklion 71003, Greece USNO - 3450 Massachusetts Ave, NW, Washington, DC 20392-5420
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Abstract

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We analyse the vertical distribution of High Mass X-ray Binaries (HMXBs) in NGC 55, the nearest edge-on galaxy to the Milky Way. Our analysis reveals significant spatial offsets of HMXBs from the star forming regions, greater than those observed in the SMC and the LMC but similar with the Milky Way. The spatial offsets can be explained by a momentum kick the X-ray binaries receive during the formation of the compact object. The difference between the scale height of the vertical distribution of HMXBs and the vertical distribution of star-forming activity is 0.48±0.04 kpc. The centre-of-mass velocity of the distribution of HMXBs in NGC 55 is moving at a velocity of 52.4±11.4 km s−1, greater than the corresponding velocity of HMXBs in the SMC and LMC, but consistent with velocities of Milky Way HMXBs.

Keywords

NGC 55X-raysHMXB
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. 358 - 361
Copyright
© International Astronomical Union 2019 

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