X-ray polarimetry as a tool to measure the black hole spin in microquasars: simulations of IXPE capabilities

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F23%3A00570198" target="_blank" >RIV/67985815:_____/23:00570198 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1093/mnras/stad077" target="_blank" >https://doi.org/10.1093/mnras/stad077</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1093/mnras/stad077" target="_blank" >10.1093/mnras/stad077</a>

Jazyk výsledku

angličtina

Název v původním jazyce

X-ray polarimetry as a tool to measure the black hole spin in microquasars: simulations of IXPE capabilities

Popis výsledku v původním jazyce

We present simulated observations of an X-ray binary system with the Imaging X-ray Polarimetry Explorer (IXPE), with the aim to study the robustness of black hole spin and geometry measurements using X-ray polarimetry. As a representative example, we used the parameters of GRS 1915 + 105 in its former unobscured, soft state. In order to simulate the polarization properties, we modelled the source emission with a multicolour blackbody accounting for thermal radiation from the accretion disc, including returning radiation. Our analysis shows that the polarimetric observations in the X-ray waveband will be able to estimate both spin and inclination of the system with a good precision [without returning radiation we obtained for the lowest spin Delta a < 0.4 (0.4/0.998 similar to 40 per cent) for spin and Delta i < 30 degrees (30 degrees/70 degrees similar to 43 per cent) for inclination, while for the higher spin values we obtained Delta a < 0.12 ( similar to 12 per cent) for spin and Delta i < 20 degrees (similar to 29 per cent) for inclination, within 1 a errors]. When focusing on the case of returning radiation and treating inclination as a known parameter, we were able to successfully reconstruct spin and disc albedo in Delta a < 0.15 (similar to 15 per cent) interval and Delta albedo < 0.45 (45 per cent) intervals within 1 a errors. We conclude that X-ray polarimetry will be a useful tool to constrain black hole spins, in addition to timing and spectral-fitting methods.

Název v anglickém jazyce

X-ray polarimetry as a tool to measure the black hole spin in microquasars: simulations of IXPE capabilities

Popis výsledku anglicky

We present simulated observations of an X-ray binary system with the Imaging X-ray Polarimetry Explorer (IXPE), with the aim to study the robustness of black hole spin and geometry measurements using X-ray polarimetry. As a representative example, we used the parameters of GRS 1915 + 105 in its former unobscured, soft state. In order to simulate the polarization properties, we modelled the source emission with a multicolour blackbody accounting for thermal radiation from the accretion disc, including returning radiation. Our analysis shows that the polarimetric observations in the X-ray waveband will be able to estimate both spin and inclination of the system with a good precision [without returning radiation we obtained for the lowest spin Delta a < 0.4 (0.4/0.998 similar to 40 per cent) for spin and Delta i < 30 degrees (30 degrees/70 degrees similar to 43 per cent) for inclination, while for the higher spin values we obtained Delta a < 0.12 ( similar to 12 per cent) for spin and Delta i < 20 degrees (similar to 29 per cent) for inclination, within 1 a errors]. When focusing on the case of returning radiation and treating inclination as a known parameter, we were able to successfully reconstruct spin and disc albedo in Delta a < 0.15 (similar to 15 per cent) interval and Delta albedo < 0.45 (45 per cent) intervals within 1 a errors. We conclude that X-ray polarimetry will be a useful tool to constrain black hole spins, in addition to timing and spectral-fitting methods.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

<a href="/cs/project/GX21-06825X" target="_blank" >GX21-06825X: Akreující černé díry v nové éře polarizačních rentgenových misí</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2023

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Monthly Notices of the Royal Astronomical Society

ISSN

0035-8711

e-ISSN

1365-2966

Svazek periodika

519

Číslo periodika v rámci svazku

4

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

11

Strana od-do

6138-6148

Kód UT WoS článku

000931186300005

EID výsledku v databázi Scopus

2-s2.0-85150949031