INTEGRAL、XMM-牛顿和ESO/NTT对AX J1749 .1-2733的鉴别：一个模糊的可能遥远的Be/X射线双星
INTEGRAL, XMM-Newton and ESO/NTT identification of AX J1749.1-2733: an obscured and probably distant Be/X-ray binary
摘要：
AX J1749.1-2733是一个未分类的瞬态X射线源，在1993-1999年由ASCA调查期间发现。为了确定其性质，进行了近红外、光学、X射线和硬X射线的多波长研究。AX J 1749.1 -2733是一颗新的高质量X射线脉冲双星，轨道周期为185.5 ± 1.1 d（或185.5/f，f= 2，3或4），自旋周期约为66 s，是Be/X射线双星的典型参数。爆发持续约12 d。还观察到0.08+/-0.02秒/年的自旋下降，很可能是由于螺旋桨效应。最准确的X射线位置是右心房。（2000）=17h49m06.8s和Dec. = -27deg32 '32”.5（unc. 2”）。高能宽带光谱符合吸收幂律和高能截止值，NH=（20+/-1）~（22）cm-2，Gamma=1.0+/-0.1，Ecut=21+/-3 keV。X射线误差圆内唯一的光学/NIR候选对应物具有R=21.9+/-0.1，I=20.92+/-0.09，J=17.42+/-0.03，H=16.71+/-0.02，Ks=15.75+/-0.07的量值，它指向一颗距离很远（> 8.5 kpc）且吸收率很高（NH~1.7e22 cm-2）的Be星。22-50 keV的平均光度在长爆发期间为（0.4-0.9）e36 erg/s，在MJD 52891上发生的明亮耀斑期间为3e 36 erg/s，假设距离为8.5 kpc。
英文摘要：
AX J1749.1-2733 is an unclassified transient X-ray source discovered during surveys by ASCA in 1993-1999. A multi-wavelength study in NIR, optical, X-rays and hard X-rays is undertaken in order to determine its nature. AX J1749.1-2733 is a new high-mass X-ray binary pulsar with an orbital period of 185.5+/-1.1 d (or 185.5/f with f=2,3 or 4) and a spin period of ~66 s, parameters typical of a Be/X-ray binary. The outbursts last ~12 d. A spin-down of 0.08+/-0.02 s/yr is also observed, very likely due to the propeller effect. The most accurate X-ray position is R.A. (2000) =17h49m06.8s and Dec. = -27deg32'32".5 (unc. 2"). The high-energy broad-band spectrum is well-fitted with an absorbed powerlaw and a high-energy cutoff with values NH=(20+/-1)e22 cm-2, Gamma=1.0+/-0.1, and Ecut=21+/-3 keV. The only optical/NIR candidate counterpart within the X-ray error circle has magnitudes of R=21.9+/-0.1, I=20.92+/-0.09, J=17.42+/-0.03, H=16.71+/-0.02, and Ks=15.75+/-0.07, which points towards a Be star located far away (> 8.5 kpc) and highly absorbed (NH~1.7e22 cm-2). The average 22-50 keV luminosity is (0.4-0.9)e36 erg/s during the long outbursts and 3e36 erg/s during the bright flare that occurred on MJD 52891 for an assumed distance of 8.5 kpc.
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