标题： 盖亚暂现源探测效率：搜寻核暂现源 显示英文标题

标题： Gaia transient detection efficiency: hunting for nuclear transients

摘要： 我们研究了与星系相关的瞬变事件对于欧洲航天局盖亚天文学任务的可探测性。我们模拟了基于一个虚构星系目录的星载探测和地面处理，以确定通过盖亚发现瞬变事件（特别是潮汐瓦解事件TDEs和超新星SNe）所需的特性。瞬变事件可能由新源的星载探测或者已知源的亮度增加而被发现。我们表明，盖亚瞬变事件可以作为新的探测对象，在宿主星系核0.1至0.5弧秒的偏移量下被识别，具体取决于星等和扫描角度。盖亚的探测系统在接近核区的径向距离上没有显著丢失超新星。我们利用探测效率来预测盖亚每年将发现的瞬变事件数量。对于极限星等19，我们预计每年大约有1300个超新星：其中65%是Ia型超新星，28%是II型超新星，7%是Ibc型超新星，以及每年约20个潮汐瓦解事件。 显示英文摘要

摘要： We present a study of the detectability of transient events associated with galaxies for the Gaia European Space Agency astrometric mission. We simulated the on-board detections, and on-ground processing for a mock galaxy catalogue to establish the properties required for the discovery of transient events by Gaia, specifically tidal disruption events (TDEs) and supernovae (SNe). Transients may either be discovered by the on-board detection of a new source or by the brightening of a previously known source. We show that Gaia transients can be identified as new detections on-board for offsets from the host galaxy nucleus of 0.1--0.5,arcsec, depending on magnitude and scanning angle. The Gaia detection system shows no significant loss of SNe at close radial distances to the nucleus. We used the detection efficiencies to predict the number of transients events discovered by Gaia. For a limiting magnitude of 19, we expect around 1300 SNe per year: 65% SN Ia, 28% SN II and 7% SN Ibc, and ~20 TDEs per year.