Gaia transient detection efficiency: hunting for nuclear transients
Gaia transient detection efficiency: hunting for nuclear transients
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DOI：
10.1093/mnras/stv2308
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发表时间：
2015-10
影响因子：
4.8
通讯作者：
N. Blagorodnova;S. Velzen;D. Harrison;Sergey E. Koposov;S. Mattila;H. Campbell;N. Walton;L. Wyrzykowski
中科院分区：
文献类型：
--
作者：
N. Blagorodnova;S. Velzen;D. Harrison;Sergey E. Koposov;S. Mattila;H. Campbell;N. Walton;L. Wyrzykowski
我们提出了一个研究与星系的盖亚欧洲航天局天体测量使命的瞬态事件的可探测性。我们模拟了机载探测和模拟星系目录的地面处理，以建立盖亚发现瞬态事件所需的属性，特别是潮汐破裂事件（TDEs）和超新星（SNe）。瞬变可以通过对新的源的机载检测或通过对先前已知的源的增亮来发现。我们表明，盖亚瞬变可以被确定为新的检测板上的偏移从宿主星系核的0.1- 0.5，arcsec，取决于幅度和扫描角度。盖亚探测系统显示，在近径向距离的核SNe没有显着的损失。我们使用检测效率来预测盖亚发现的瞬变事件的数量。对于19等的极限星等，我们预计每年约有1300个SNe：65%的SN Ia，28%的SN II和7%的SN Ibc，以及每年约20个TDE。
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.