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We propose XMM-Newton observations of two middle-aged radio-quiet Fermi pulsars J0554+3107 and J0622+3749. The former is associated with the supernova remnant G179.0+2.6 which provides a great advantage for confident constraining its distance and evolution stage. Using Chandra comma eROSITA and Swift shallow exposures we have found their X-ray counterparts. Thermal spectral components dominate their X-ray emission. Measurements of the parameters of these components are important for comparison with neutron star cooling theories and the study of fundamental properties of superdense nuclear matter inside the stars. However comma any accurate conclusions are impossible due to low count statistics. We request for followup observations to study thermal emission from these pulsars.我们申请对两颗射电静默的费米（Fermi）中年脉冲星J0554+3107与J0622+3749开展XMM-牛顿（XMM-Newton）观测。其中第一颗脉冲星与超新星遗迹G179.0+2.6成协，这为可靠限定其距离与演化阶段提供了显著优势。基于钱德拉（Chandra）、eROSITA与斯威夫特（Swift）的浅曝光观测，我们已找到这两颗脉冲星的X射线对应体。它们的X射线辐射以热谱成分为主导。对这些热谱成分参数的测量，可用于与中子星冷却理论开展比对，同时有助于研究脉冲星内部超致密核物质的基本属性。然而，因光子计数统计量偏低，无法得出精准结论。因此我们申请后续观测，以研究这两颗脉冲星的热辐射。