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The Cartwheel galaxy as a stepping stone for binaries formation

Published online by Cambridge University Press:  30 December 2019

Anna Wolter Open the ORCID record for Anna Wolter [Opens in a new window] ,
Guido Consolandi ,
Marcella Longhetti ,
Marco Landoni  and
Andrea Bianco
Anna Wolter
Affiliation:
INAF-Osservatorio Astronomico di Brera, Via Brera 28, I-20121 Milano, Italy email: anna.wolter@inaf.it
Guido Consolandi
Affiliation:
INAF-Osservatorio Astronomico di Brera, Via Brera 28, I-20121 Milano, Italy email: anna.wolter@inaf.it Universitá degli Studi di Milano Bicocca, Piazza dell’Ateneo Nuovo, 1, I-20126 Milano, Italy email: guido.consolandi@inaf.it
Marcella Longhetti
Affiliation:
INAF-Osservatorio Astronomico di Brera, Via Brera 28, I-20121 Milano, Italy email: anna.wolter@inaf.it
Marco Landoni
Affiliation:
INAF-Osservatorio Astronomico di Brera, Via Brera 28, I-20121 Milano, Italy email: anna.wolter@inaf.it
Andrea Bianco
Affiliation:
INAF-Osservatorio Astronomico di Brera, Via Brera 28, I-20121 Milano, Italy email: anna.wolter@inaf.it
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Abstract

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Ultraluminous X-ray sources (ULXs) are end points of stellar evolution. They are mostly interpreted as binary systems with a massive donor. They are also the most probable progenitors for BH-BH, and even more, for BH-NS coalescence. Parameters of ULXs are not know and need to be better determined, in particular the link with the metallicity of the environment which has been invoked frequently but not proven strongly. We have tackled this problem by using a MUSE DEEP mosaic of the Cartwheel galaxy and applying a Monte Carlo code that jointly fits spectroscopy and photometry. We measure the metallicity of the emitting gas in the ring and at the positions of X-ray sources by constructing spatially resolved emission line ratio maps and BPT diagnostic maps. The Carthweel is the archetypal ring galaxy and the location and formation time of new stellar populations is easier to reconstruct than in more normal galaxies. It has the largest population of ULXs ever observed in a single galaxy (16 sources have been classified as ULXs in Chandra and XMM-Newton data). The Cartwheel galaxy is therefore the ideal laboratory to study the relation between Star Formation (SF Rates and SF History) and number of ULXs and also their final fate. We find that the age of the stellar population in the outer ring is consistent with being produced in the impact (≤300Myr) and that the metallicity is mostly sub-solar, even if solutions can be found with a solar metallicity that account for most observed properties. The findings for the Cartwheel will be a testbed for further modelisation of binary formation and evolution paths.

Keywords

stars: binariesgalaxies: individual (Cartwheel)galaxies: peculiargalaxies: interactiongalaxies: evolution
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. 297 - 306
Copyright
© International Astronomical Union 2019 

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