تقرير
Soft X-ray Energy Spectra in the Wide-Field Galactic Disk Area Revealed with HaloSat
| العنوان: | Soft X-ray Energy Spectra in the Wide-Field Galactic Disk Area Revealed with HaloSat |
|---|---|
| المؤلفون: | Ampuku, Kazuki, Mitsuishi, Ikuyuki, Sakuta, Koki, Kaaret, Philip, LaRocca, Daniel M., Angelini, Lorella |
| سنة النشر: | 2023 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Astrophysics of Galaxies, Astrophysics - Solar and Stellar Astrophysics |
| الوصف: | We analyzed data from HaloSat observations for five fields in the Galactic disk located far away from the Galactic center (135$^{\circ}$ $<$ $l$ $<$ 254$^{\circ}$) to understand the nature of soft X-ray energy emission in the Galactic disk. The fields have 14$^{\circ}$ diameter and were selected to contain no significant high-flux X-ray sources. All five HaloSat soft X-ray energy spectra (0.4--7 keV with energy resolution of $<$100 eV below 1 keV) show a possibility of the presence of unresolved high-temperature plasma in the Galactic disk (UHTPGD) with a temperature of 0.8--1.0 keV and an emission measure of (8--11)$\times10^{-4} \rm cm^{-6} pc$ in addition to the soft X-ray diffuse background components mainly studied at higher galactic latitudes (solar wind charge exchange emission, local hot bubble, Milky Way halo emission, and the cosmic X-ray background). This suggests that the UHTPGD is present across the whole Galactic disk. We also observed UHTPGD emission in a region with no bright sources in an {\it XMM-Newton} field contained within one of the {\it HaloSat} fields. The temperature and emission measure are consistent with those measured with {\it HaloSat}. Moreover, the stacked spectra of the X-ray point-like sources and NIR-identified point sources such as stars in the {\it XMM-Newton} field also show a spectral feature similar to the UHTPGD emission. This suggests that the UHTPGD may partly originate from point-like sources such as stars. Comment: Accepted for publication in ApJ. 11 pages and 4 figures |
| نوع الوثيقة: | Working Paper |
| URL الوصول: | http://arxiv.org/abs/2312.02551 |
| رقم الأكسشن: | edsarx.2312.02551 |
| قاعدة البيانات: | arXiv |
| الوصف غير متاح. |