Recently, a new radio millisecond pulsar(MSP) J1740-5340B, hosted in the globular cluster(GC) NGC 6397,was reported with a 5.78 ms spin period in an eclipsing binary system with a 1.97 days orbital period. Based on a ...Recently, a new radio millisecond pulsar(MSP) J1740-5340B, hosted in the globular cluster(GC) NGC 6397,was reported with a 5.78 ms spin period in an eclipsing binary system with a 1.97 days orbital period. Based on a modified radio ephemeris updated by tool tempo2, we analyze the ~15 yr γ-ray data obtained from the Large Area Telescope on board the Fermi Gamma-ray Space Telescope and detect PSR J1740-5340B's γ-ray pulsation at a confidence level of ~4σ with a weighted H-test value of ~26. By performing a phase-resolved analysis, the γ-ray luminosity in on-pulse interval of PSR J1740-5340B is L_(γ)~ 3.8 × 10^(33) erg s^(-1) using NGC 6397's distance of 2.48 kpc. And γ-rays from the on-pulse part of PSR J1740-5340B contribute ~90% of the total observed γ-ray emissions from NGC 6397. No significant γ-ray pulsation of another MSP J1740-5340A in the GC is detected.Considering that the previous four cases of MSPs in GCs, more data in γ-ray, X-ray, and radio are encouraged to finally confirm the γ-ray emissions from MSP J1740-5340B, especially starving for a precise ephemeris.展开更多
基金supported in part by the National Natural Science Foundation of China Nos. 12163006 and 12233006the Basic Research Program of Yunnan Province No. 202201AT070137+1 种基金the joint foundation of Department of Science and Technology of Yunnan Province and Yunnan University No. 202201BF070001-020support by the Xingdian Talent Support Plan-Youth Project。
文摘Recently, a new radio millisecond pulsar(MSP) J1740-5340B, hosted in the globular cluster(GC) NGC 6397,was reported with a 5.78 ms spin period in an eclipsing binary system with a 1.97 days orbital period. Based on a modified radio ephemeris updated by tool tempo2, we analyze the ~15 yr γ-ray data obtained from the Large Area Telescope on board the Fermi Gamma-ray Space Telescope and detect PSR J1740-5340B's γ-ray pulsation at a confidence level of ~4σ with a weighted H-test value of ~26. By performing a phase-resolved analysis, the γ-ray luminosity in on-pulse interval of PSR J1740-5340B is L_(γ)~ 3.8 × 10^(33) erg s^(-1) using NGC 6397's distance of 2.48 kpc. And γ-rays from the on-pulse part of PSR J1740-5340B contribute ~90% of the total observed γ-ray emissions from NGC 6397. No significant γ-ray pulsation of another MSP J1740-5340A in the GC is detected.Considering that the previous four cases of MSPs in GCs, more data in γ-ray, X-ray, and radio are encouraged to finally confirm the γ-ray emissions from MSP J1740-5340B, especially starving for a precise ephemeris.
文摘目的:骨形态发生蛋白-4(bone morphogenentic protein-4,BMP4)在动脉粥样硬化(atherosclerosis,AS)的病理过程中具有重要调节作用,但相关的临床研究较少。本研究拟观察以AS为主要病理特点的动脉阻塞性疾病(arterial occlusive disease,ACD)患者血浆BMP4的表达情况,并分析血浆中BMP4与炎症因子和血管损伤标志物之间的相关性。方法:共招募38名诊断为ACD的患者(ACD组)和38名体检志愿者(对照组),抽取ACD组患者术前和对照组体检时的静脉血,比较2组血常规指标的差异。采用酶联免疫吸附试验(enzyme linked immunosorbent assay,ELISA)检测血浆中BMP4、肿瘤坏死因子α(tumor necrosis factor-α,TNF-α)、白细胞介素(interleukin,IL)-1β、IL-10及血管内皮钙黏蛋白(vascular endothelial cadherin,VE-cadherin)的表达变化,并进一步分析BMP4与以上各指标之间的相关性。结果:与对照组相比,ACD组患者血常规结果表现为中性粒细胞-淋巴细胞比值[neutrophil to lymphocyte ratio,NLR;1.63(1.26,1.91)vs 3.43(2.16,6.61)]和血小板-淋巴细胞比值[platelet to lymphocyte ratio,PLR;6.37(5.26,7.74)vs 15.79(7.97,20.53)]升高、淋巴细胞-单核细胞比值[lymphocyte to monocyte ratio,LMR;5.67(4.41,7.14)vs3.43(2.07,3.74)]下降(均P<0.05);ACD组患者血浆BMP4[581.26(389.85,735.64)pg/mL vs 653.97(510.95,890.43)pg/mL]、TNF-α[254.16(182.96,340.70)pg/mLvs293.29(238.90,383.44)pg/mL]及内皮标志物VE-cadherin[1.54(1.08,2.13)ng/mL vs 1.85(1.30,2.54)ng/mL]的水平均显著升高,而抗炎因子IL-10的水平显著下降[175.89(118.39,219.25)pg/mLvs135.92(95.80,178.04)pg/mL](均P<0.05)。2组间促炎因子IL-1β的差异无统计学意义[300.39(205.39,403.56)pg/mL vs 378.46(243.20,448.69)pg/mL;P=0.09]。相关分析结果表明:血浆BMP4水平与促炎因子IL-1β(r=0.35)、TNF-α(r=0.31)以及内皮标志物VE-cadherin(r=0.47)呈正相关,与抗炎因子IL-10呈负相关(r=-0.37;均P<0.01)。结论:ACD患者血浆BMP4的水平升高,且与患者的炎症水平和血管损伤程度具有相关性。
