TY  - JOUR
A1  - Oskinova, Lida
A1  - Bik, A.
A1  - Mas-Hesse, J. M.
A1  - Hayes, M.
A1  - Adamo, A.
A1  - Östlin, Göran
A1  - Fürst, F.
A1  - Otí-Floranes, H.
T1  - ULX contribution to stellar feedback
BT  - an intermediate-mass black hole candidate and the population of ULXs in the low-metallicity starburst galaxy ESO338-4
JF  - Astronomy and astrophysics : an international weekly journal
N2  - Context. X-ray radiation from accreting compact objects is an important part of stellar feedback. The metal-poor galaxy ESO 338-4 has experienced vigorous starburst during the last <40 Myr and contains some of the most massive super star clusters in the nearby Universe. Given its starburst age and its star-formation rate, ESO 338-4 is one of the most efficient nearby manufactures of neutron stars and black holes, hence providing an excellent laboratory for feedback studies. Aims. We aim to use 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 ESO 338-4. Methods. We compared X-ray images and spectra with integral field spectroscopic observations in the optical to constrain the nature of strong X-ray emitters. Results. X-ray observations uncover three ultraluminous X-ray sources (ULXs) in ESO 338-4. The brightest among them, ESO 338 X-1, has X-ray luminosity in excess of 10(40) erg s(-1). We speculate that ESO 338-4 X-1 is powered by accretion on an intermediate-mass (greater than or similar to 300 M-circle dot)black hole. We show that X-ray radiation from ULXs and hot superbubbles strongly contributes to He II ionization and general stellar feedback in this template starburst galaxy.
KW  - galaxies: dwarf
KW  - galaxies: individual: ESO 338-4
KW  - X-rays: binaries
KW  - X-rays: ISM
Y1  - 2019
U6  - https://doi.org/10.1051/0004-6361/201935414
SN  - 1432-0746
VL  - 627
PB  - EDP Sciences
CY  - Les Ulis
ER  -