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首页> 外文期刊>Astronomy and astrophysics >ALMA observations of 4U?1728?34 and 4U?1820?30: first detection of neutron star X-ray binaries at 300 GHz
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ALMA observations of 4U?1728?34 and 4U?1820?30: first detection of neutron star X-ray binaries at 300 GHz

机译：ALMA对4U？1728？34和4U？1820？30的观测：首次检测300 GHz的中子星X射线双星

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We report on the first observations of neutron star low-mass X-ray binaries with the Atacama Large Millimeter/submillimeter Array (ALMA) at ~ 300 GHz. Quasi-simultaneous observations of 4U?1728 ? 34 and 4U?1820 ? 30 were performed at radio (ATCA), infrared (VLT) and X-ray ( Swift ) frequencies, spanning more than eight decades in frequency coverage. Both sources are detected at high significance with ALMA. The spectral energy distribution of 4U?1728 ? 34 is consistent with synchrotron emission from a jet with a break from optically thick to optically thin emission at 1.3–11.0 × 10 ~(13) Hz. This is the third time a jet spectral break has been reported for a neutron star X-ray binary. The radio to mm spectral energy distribution of 4U?1820 ? 30 has significant detections at 5 and 300 GHz. This confirms the presence of radio emission during a soft state for this neutron star and represents the first detection of mm emission during such a state, unambiguously pointing to the presence of a jet. We also report on three additional unrelated sources – showing mm emission – in the ALMA fields of view of 4U?1728 ? 34 and 4U?1820 ? 30.
机译：我们报告了在300 GHz左右的阿塔卡马大毫米/亚毫米阵列（ALMA）对中子星低质量X射线双星的首次观察。 4U？1728？的准同时观测34和4U？1820？在无线电（ATCA），红外（VLT）和X射线（Swift）频率下进行了30次，覆盖了八十多年的频率。 ALMA对这两种来源均具有很高的意义。 4U？1728？的光谱能量分布34与射流的同步加速器发射一致，在1.3–11.0×10〜（13）Hz时从光学厚发射到光学薄发射中断。这是第三次报告中子星X射线双星的喷射光谱破裂。无线电到4U？1820？mm的频谱能量分布30在5 GHz和300 GHz处具有显着检测。这证实了该中子星在软态期间存在无线电发射，并且代表了在这种状态下首次检测到毫米辐射，明确指出了射流的存在。我们还报告了在4U？1728？AL的ALMA视场中的另外三个不相关的源（显示mm发射）。 34和4U？1820？ 30岁

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