A Chandra Deep X-ray Exposure on the Galactic Plane and Near Infrared Identification

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dc.creatorEbisawa, K.
dc.creatorPaizis, A.
dc.creatorCouvoisier, T. J. -L.
dc.creatorDubath, P.
dc.creatorTsujimoto, M.
dc.creatorHamaguchi, K.
dc.creatorBeckmann, V.
dc.creatorBamba, A.
dc.creatorSenda, A.
dc.creatorUeno, M.
dc.creatorKaneda, H.
dc.creatorMaeda, Y.
dc.creatorSato, G.
dc.creatorYamauchi, S.
dc.creatorCutri, R.
dc.creatorNishihara, E.
dc.date2004-07-09
dc.date.accessioned2026-07-07T02:13:48Z
dc.date.available2026-07-07T02:13:48Z
dc.descriptionUsing the Chandra ACIS-I instruments, we have carried out a deep X-ray observation on the Galactic plane region at (l,b) ~ (28.5, 0.0), where no discrete X-ray sources have been known previously. We have detected, as well as strong diffuse emission, 274 new point X-ray sources (4 sigma confidence) within two partially overlapping fields (~250 arcmin^2 in total) down to the flux limit ~3 x 10^{-15} $ erg s^{-1} cm^{-2} (2 -- 10 keV) and ~ 7 x 10^{-16} erg s^{-1} cm^{-2} (0.5 -- 2 keV). We clearly resolved point sources and the Galactic diffuse emission, and found that ~ 90 % of the flux observed in our field of view originates from diffuse emission. Many point sources are detected either in the soft X-ray band (below 2 keV) or in the hard band (above 2 keV), and only a small number of sources are detected in both energy bands. On the other hand, most soft X-ray sources are considered to be nearby X-ray active stars. We have carried out a follow-up near-infrared (NIR) observation using SOFI at ESO/NTT. Most of the soft X-ray sources were identified, whereas only a small number of hard X-ray sources had counterparts in NIR. Using both X-ray and NIR information, we can efficiently classify the point X-ray sources detected in the Galactic plane. We conclude that most of the hard X-ray sources are background Active Galactic Nuclei seen through the Milky Way, whereas majority of the soft X-ray sources are nearby X-ray active stars.
dc.descriptionProceedings for 5th INTEGRAL workshop in February 2004, Munchen, Germany
dc.identifierhttps://arxiv.org/abs/astro-ph/0407205
dc.identifierhttp://arxiv.org/abs/astro-ph/0407205
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/7939
dc.subjectAstrophysics
dc.titleA Chandra Deep X-ray Exposure on the Galactic Plane and Near Infrared Identification
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