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A ULX in NGC 4559: A “Mini-Cartwheel” Scenario?

Published online by Cambridge University Press:  22 February 2018

R. Soria ,
M. S. Cropper  and
M. W. Pakull
R. Soria
Affiliation:
Mullard Space Science Laboratory, University College London
M. S. Cropper
Affiliation:
Mullard Space Science Laboratory, University College London
M. W. Pakull
Affiliation:
Observatoire de Strasbourg, France

Abstract

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We have studied the peculiar environment around a ULX in NGC 4559 (with Lx ≈ 2 x 1040 erg s–1 and MBH ≳ 50M⊙). The X-ray source is located near the rim of a young (age < 30 Myr), large (diameter ≈ 700 pc) ring-like star forming complex possibly triggered by the impact of a dwarf satellite galaxy through the gas-rich outer disk of NGC 4559. We speculate that galaxy interactions (including the infall of high-velocity clouds and satellites on a galactic disk) and low-metallicity environments offer favourable conditions for the formation of compact remnants more massive than “standard” X-ray binaries, and accreting from a massive Roche-lobe filling companion.

Resumen

Resumen

Estudiamos el peculiar medio alrededor de una ULX en NGC 4559 (con Lx ≈ 2 x 1040 erg s–1 y MBH ≳ 50M⊙). La fuente de rayos X se localiza cerca del borde (edad < 30 Myr) de un complejo grande (diámetro ≈ 700 pc), joven, en forma de anillo, con formación de estrellas posiblemente inducida por el impacto de una galaxia satélite enana a través del disco exterior rico en gas de NGC 4559. Suponemos que interacciones galácticas (incluyendo la caída de nubes de alta velocidad y satélites sobre el disco galáctico) y el medio de baja metalicidad representan condiciones favorables para la formación de rémanentes más masivos que las binarias de rayos X “estándar” y que los que acretan materia de una compañera masiva que llena el lóbulo de Roche.

Keywords

GalaxiesIndividual (NGC 4559) — GalaxiesInteractions — GalaxiesSpiral — X-RaysGalaxies
Type
The Contributed Papers
Information
International Astronomical Union Colloquium , Volume 194: Compact binaries in the galaxy and beyond , 2004 , pp. 57 - 59
Copyright
Copyright © Instituto de astronomia/revista mexicana de astronomίa y astrofίsica 2004

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