On the contribution of ULXs to stellar feedback: an intermediate mass black hole candidate and the population of ULXs in the low-metallicity starburst galaxy ESO 338-4. (arXiv:1903.05142v1 [astro-ph.GA])

On the contribution of ULXs to stellar feedback: an intermediate mass black hole candidate and the population of ULXs in the low-metallicity starburst galaxy ESO 338-4. (arXiv:1903.05142v1 [astro-ph.GA])
<a href="http://arxiv.org/find/astro-ph/1/au:+Oskinova_L/0/1/0/all/0/1">Lidia M. Oskinova</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Bik_A/0/1/0/all/0/1">Arjan Bik</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Mas_Hesse_J/0/1/0/all/0/1">J. Miguel Mas-Hesse</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Hayes_M/0/1/0/all/0/1">Matthew Hayes</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Adamo_A/0/1/0/all/0/1">Angela Adamo</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Oestlin_G/0/1/0/all/0/1">Goeran Oestlin</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Fuerst_F/0/1/0/all/0/1">Felix Fuerst</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Oti_Floranes_H/0/1/0/all/0/1">Hector Oti-Floranes</a>

X-ray radiation from accreting compact objects is an important part of
stellar feedback. The metal poor galaxy ESO338-4 has experienced vigorous
starburst during last 40 Myr and contains some of the most massive super star
clusters in the nearby Universe. Given its strarburst age and its
star-formation rate, ESO338-4 is one of the most efficient nearby manufactures
of neutron star and black holes, hence providing the excellent laboratory for
feedback studies. We used X-ray observations with the largest modern X-ray
telescopes, XMM-Newton and Chandra to unveil the most luminous accreting
neutron stars and black holes in ESO338-4. We also used the comparison between
the X-ray images and spectra with integral field spectroscopic observations in
the optical to constrain the nature of strong X-ray emitters. X-ray
observations uncovered three ultraluminous X-ray sources in ESO338-4. The
brightest among them, ESO338-4 X-1, has X-ray luminosity in excess 10^{40}
erg/s. We speculate that ESO338-4 X-1 is powered by accretion on an
intermediate mass 300M_sun black hole. We suggest that X-ray radiation from
ULXs strongly contributes to stellar feedback in this template starburst
galaxy.

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