Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006apj...649l.107k&link_type=abstract
The Astrophysical Journal, Volume 649, Issue 2, pp. L107-L110.
Astronomy and Astrophysics
Astronomy
6
Stars: Circumstellar Matter, Infrared: Stars, Stars: Emission-Line, Be, X-Rays: Binaries, X-Rays: Individual: Alphanumeric: Gx 301-2, X-Rays: Individual (Igr J16318-4848)
Scientific paper
We present evidence for excess long-wavelength emission from two high-mass X-ray binaries, IGR J16318-4848 and GX 301-2, that show enormous obscuration (NH~=1023-1024 cm-2) in their X-ray spectra. Using archival near- and mid-infrared data, we show that the spectral energy distributions of IGR J16318-4848 and GX 301-2 are substantially higher in the mid-infrared than their expected stellar emission. We successfully fit the excesses with ~1000 K blackbodies, which suggests that they are due to warm circumstellar dust that also gives rise to the X-ray absorption. However, we need further observations to constrain the detailed properties of the excesses. This discovery highlights the importance of mid-infrared observations for understanding highly obscured X-ray binaries.
Kaplan David L.
Moon Dae-Sik
Reach William T.
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