Identification of four X-ray sources from the INTEGRAL and Swift catalogs

Abstract

Four hard X-ray sources from the INTEGRAL and Swift catalogs have been identified. X-ray and optical spectra have been obtained for each of the objects being studied by using data from the INTEGRAL, Swift, ROSAT, and Chandra X-ray observatories as well as observations with the RTT-150 and AZT-33IK optical telescopes. Two sources (SWIFT J1553.6+2606 and SWIFT J1852.2+8424) are shown to be extragalactic in nature: the first is a quasar, while the registered X-ray flux from the second is the total emission from two Seyfert 1 galaxies at redshifts 0.1828 and 0.2249. The source IGR J22534+6243 resides in our Galaxy and is an X-ray pulsar with a period of ∼ 46.674 s that is a member of a high-mass X-ray binary, probably with a Be star. The nature of yet another Galactic source, SWIFT J1852.8+3002, is not completely clear and infrared spectroscopy is needed to establish it.

High-mass X-ray binaries in the Milky Way

“…Based on Chandra and Swift archival data, Halpern (2012a) found pulsations of the X-ray emission with a period P spin ≃ 46.67 s. The broad band spectrum of IGR J22534+6243 obtained with Chandra, Swift and INTEGRAL observatories can be well described by a powerlaw model with a cutoff energy of 25 − 30 keV, slightly higher than usually observed for X-ray pulsars (Lutovinov et al, 2013a). The proposed optical counterpart 2MASS J22535512+6243368 was observed later by Masetti et al (2012a) and Lutovinov et al (2013a), who revealed an optical spectrum typical for an early type star with superimposed Hα, Hβ and HeI emissions at redshift zero. Based on these measurements it was concluded that IGR J22534+6243 is a X-ray pulsar in a Be high mass X-ray binary system.…”

“…2d). These observations allow to classify IGR J22534+6243 as a new X-ray pulsar in a Be high-mass X-ray binary system (Lutovinov et al, 2013a). Other examples of the optical and infrared spectra of high-mass X-ray binaries, discovered by INTEGRAL are shown in Fig.…”

New hard X-ray sources discovered in the ongoing INTEGRAL Galactic plane survey after 14 yr of observations

“…In the previous paper (Krivonos et al 2012), we pre- Lutovinov et al 2013b, for details). A number of multi-wavelength follow-up observations were initiated to unveil the nature of these unclassified objects (Karasev et al 2012;Masetti et al 2013;Revnivtsev et al 2013;Zolotukhin & Revnivtsev 2015;Lutovinov et al 2013aLutovinov et al , 2015Tomsick et al 2015Tomsick et al , 2016aClavel et al 2016;Burenin et al 2016;Rahoui et al 2017) which led to the classification of 11 sources (shown by solid red circles in Fig. 1), rising the total survey identification completeness from ∼92% to ∼94%.…”

High-Mass X-ray Binaries in the Milky Way: A closer look with INTEGRAL

“…Based on Chandra and Swift archival data, Halpern (2012a) found pulsations of the X-ray emission with a period P spin ≃ 46.67 s. The broad band spectrum of IGR J22534+6243 obtained with Chandra, Swift and INTEGRAL observatories can be well described by a powerlaw model with a cutoff energy of 25 − 30 keV, slightly higher than usually observed for X-ray pulsars (Lutovinov et al, 2013a). The proposed optical counterpart 2MASS J22535512+6243368 was observed later by Masetti et al (2012a) and Lutovinov et al (2013a), who revealed an optical spectrum typical for an early type star with superimposed Hα, Hβ and HeI emissions at redshift zero. Based on these measurements it was concluded that IGR J22534+6243 is a X-ray pulsar in a Be high mass X-ray binary system.…”