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- W2023368444 abstract "IGR J18179−1621 is an obscured accreting X-ray pulsar discovered by INTEGRAL on 2012 February 29. We report on our 20 ks Chandra-High Energy Transmission Gratings Spectrometer observation of the source performed on 2012 March 17, on two short contemporaneous Swift observations, and on our two near-infrared (Ks, Hn, and Jn) observations performed on 2012 March 13 and 26. We determine the most accurate X-ray position of IGR J18179−1621, αJ2000 = 18h17m5218, δJ2000 = −16°21'3168 (90% uncertainty of 06). A strong periodic variability at 11.82 s is clearly detected in the Chandra data, confirming the pulsating nature of the source, with the light-curve softening at the pulse peak. The quasi-simultaneous Chandra–Swift spectra of IGR J18179−1621 can be well fit by a heavily absorbed hard power law (NH = 2.2 ± 0.3 × 1023 cm−2 and photon index Γ = 0.4 ± 0.1) with an average absorbed 2–8 keV flux of 1.4 × 10−11 erg cm−2 s−1. At the Chandra-based position, a source is detected in our near-infrared (NIR) maps with Ks = 13.14 ± 0.04 mag, Hn = 16 ± 0.1 mag, and no Jn-band counterpart down to ∼18 mag. The NIR source, compatible with 2MASS J18175218−1621316, shows no variability between 2012 March 13 and 26. Searches of the UKIDSS database show similar NIR flux levels at epochs six months prior to and after a 2007 February 11 archival Chandra observation where the source's X-ray flux was at least 87 times fainter. In many ways IGR J18179−1621 is unusual: its combination of a several week long outburst (without evidence of repeated outbursts in the historical record), high absorption column (a large fraction of which is likely local to the system), and 11.82 s period does not fit neatly into existing X-ray binary categories." @default.
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- W2023368444 date "2012-09-12" @default.
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- W2023368444 title "X-RAY AND NEAR-INFRARED OBSERVATIONS OF THE OBSCURED ACCRETING PULSAR IGR J18179–1621" @default.
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