Study of the X-ray/gamma source AX J1910.7+0917 and three newly discovered INTEGRAL sources

TL;DR

This study analyzes the variable X-ray/gamma source AX J1910.7+0917 using multi-mission data, models its spectrum, and reports three new INTEGRAL sources discovered in its field, enhancing understanding of high-energy sources.

Contribution

It provides a comprehensive multi-instrument analysis of AX J1910.7+0917 and reports three new INTEGRAL sources, expanding the catalog of high-energy astrophysical objects.

Findings

AX J1910.7+0917 shows variability and has a spectrum modeled as an absorbed powerlaw with an iron line.

Three new INTEGRAL sources were discovered in the field, with follow-up observations confirming their nature.

The source's classification remains uncertain due to spectral and variability characteristics.

Abstract

AX J1910.7+0917 is a still unidentified source discovered with ASCA and observed more recently with IBIS/ISGRI, mainly noticeable for its rather hard spectrum. We analyzed all the public available data on this source, and we took advantage of the recent improvements performed in the INTEGRAL data analysis software to fully exploit the IBIS/ISGRI data. In the data collected from INTEGRAL, XMM-Newton, Chandra and ASCA the source is clearly variable. The spectrum can be modelled as an absorbed powerlaw (NH~6x10^22 cm^-2, Gamma=1.5) with an iron line at 6.4 keV. The present data still do not allow for a unique classification of the source. In the IBIS/ISGRI field of view around AX J1910.7+0917, we discovered three new sources: IGR J19173+0747, IGR J19294+1327 and IGR J19149+1036, where the latter is positionally coincident with the Einstein source 2E 1912.5+1031. For the first two sources we report results obtained from follow-up observations carried out with Swift/XRT.