RX J2143.0+0654的紫外光谱、X射线发射及自行
UVOIR spectrum, X-ray emission, and proper motion of the isolated neutron star RX J2143.0+0654
AI总结：
研究RX J2143.0+0654的紫外光谱、X射线发射及自行，发现其紫外部分符合热光谱，X射线脉动性质与以往观测一致，且自行表明其可能在约0.5Myr前在太阳系附近诞生。
摘要：
我们利用哈勃空间望远镜（HST）在UVOIR波长范围（0.14-1.7μm）对孤立中子星RX J2143.0+0654进行了观测。紫外部分与热光谱的Rayleigh-Jeans尾部（f_ν∝ν²）一致，而近红外-光学部分则由幂律光谱（f_ν∝ν^α，α≈-0.8）主导。将UVOIR与同时期X射线光谱联合拟合，考虑双组件黑体加可能的吸收特征+幂律光学光谱，得到冷组件的温度和表观半径（在紫外部分贡献最大）：kT_cold≈45eV，R_cold≈6d_260km，其中d_260是距离单位为260pc。热组件的温度和半径、吸收特征在0.74keV处的参数以及X射线脉动的性质与之前的X射线观测结果相同。在近红外图像中，中子星可能被扩展发射包围，特征大小约为2''，在1.54μm和1.15μm处的流量密度分别为约1.7和0.9μJy。与14年前的HST观测相比，发现自行μ≈6mas/yr，对应小的横向速度7d_260km/s。这与中子星约0.5Myr前在太阳系附近诞生的假说一致。
英文摘要：
We observed the isolated neutron star RX J2143.0+0654 with the Hubble Space Telescope (HST) in the UVOIR wavelength range (0.14-1.7 $μ$m). The UV part is consistent with a Rayleigh-Jeans tail of a thermal spectrum, $f_ν\propto ν^2$, while a power-law spectrum, $f_ν\propto ν^α$ with $α\sim -0.8$, dominates in the NIR-optical. A joint fit of the UVOIR and contemporaneous X-ray spectra with a two-component blackbody with possible absorption features + power-law optical spectrum yields the following temperature and apparent radius of the colder component (which gives the main contribution in the UV): $kT_{\rm cold}\approx 45$ eV, $R_{\rm cold}\approx 6 d_{260}$ km, where $d_{260}$ is the distance in units of 260 pc. The temperature and radius of the hotter component, $kT_{\rm hot}\approx 106$ eV and $R_{\rm hot} \approx 1.5d_{260}$ km, the parameters of an absorption feature at 0.74 keV, and the properties of X-ray pulsations, are the same as found in previous X-ray observations. In the NIR images the neutron star is possibly surrounded by extended emission with a characteristic size of $\sim 2''$ and flux densities of about 1.7 and 0.9 $μ$Jy at 1.54 and 1.15 $μ$m, respectively. Comparison with a previous HST observation in the optical 14 years ago shows a proper motion $μ\approx 6$ mas yr$^{-1}$, which corresponds to a small transverse velocity of $7d_{260}$ km s$^{-1}$. It is consistent with the hypothesis that the neutron star was born in the vicinity of the solar system about 0.5 Myr ago.
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