A Chandra deep X-ray exposure on the Galactic plane and near infrared identification

K. Ebisawa, A. Paizis, T. J L Couvoisier, P. Dubath, M. Tsujimoto, K. Hamaguchi, V. Beckmann, A. Bamba, A. Senda, M. Ueno, H. Kaneda, Y. Maeda, G. Sato, S. Yamauchi, R. Cutri, E. Nishihara

研究成果: Article

抜粋

Using 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 σ confidence) within two partially overlapping fields (∼250 arcmin2 in total) down to the flux limit ∼ 3 × 10-15 erg s -1 cm-2 (2 - 10 keV) and ∼ 7 × 7 × 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.

元の言語English
ページ(範囲)687-690
ページ数4
ジャーナルUnknown Journal
発行部数552
出版物ステータスPublished - 2004

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ASJC Scopus subject areas

  • Aerospace Engineering

これを引用

Ebisawa, K., Paizis, A., Couvoisier, T. J. L., Dubath, P., Tsujimoto, M., Hamaguchi, K., Beckmann, V., Bamba, A., Senda, A., Ueno, M., Kaneda, H., Maeda, Y., Sato, G., Yamauchi, S., Cutri, R., & Nishihara, E. (2004). A Chandra deep X-ray exposure on the Galactic plane and near infrared identification. Unknown Journal, (552), 687-690.