# Mapping the X-ray Sky with SRG: First Results from eROSITA and ART-XC

15-20 March 2020
Garching
Europe/Berlin timezone

## Ultra Luminous X-ray sources - new distance indicators?

Not scheduled
20m
Garching

Poster

### Description

We fit the NuSTAR and XMM-Newton data of three sources: NGC7793 P13, NGC5907 ULX1, and Circinus ULX5. Our single model contains emission form non-spherical system: neutron star plus accretion disk directed towards observer. We obtained the very good fit with the reduced $\chi^2$ per degree of freedom equal 1.08 for P13, 1.01 for ULX1, and 1.14 for ULX5. The normalization of our model constrains the distance to the source. The resulting distances are $D=3.41^{+0.11}_{-0.10}$, $6.55_{-0.81}^{+0.69}$ and $2.60^{+0.05}_{-0.03}$ Mpc, for P13, ULX1 and ULX5 respectively. The distances to P13 and ULX5 are in perfect agreement with previous distance measurements to their host galaxies. Our results confirm that P13, ULX1 and ULX5 may contain central hot neutron star. When the outgoing emission is computed by integration over the emitting surface and successfully fitted to the data, then the resulting model normalization is the direct distance indicator.

### Primary author

Prof. Agata Różańska (CAMK PAN)

### Presentation Materials

There are no materials yet.
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