期刊
ASTROPHYSICAL JOURNAL
卷 895, 期 2, 页码 -出版社
IOP Publishing Ltd
DOI: 10.3847/1538-4357/ab917d
关键词
-
资金
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Fonds de recherche du Quebec-Nature et Technologies (FRQNT)
- Bob Wares Science Innovation Prospectors Fund
- NSERC Discovery grant
- FRQNT Nouveaux Chercheurs grant
- Canadian Institute for Advanced Research (CIFAR)
- McGill Trottier Chair in Astrophysics and Cosmology
- McGill Space Institute
- Dan David Foundation
We present a wide-field optical imaging search for electromagnetic counterparts to the likely neutron star-black hole (NS-BH) merger GW190814/S190814bv. This compact binary merger was detected through gravitational waves by the LIGO/Virgo interferometers, with masses suggestive of an NS-BH merger. We imaged the LIGO/Virgo localization region using the MegaCam instrument on the Canada-France-Hawaii Telescope (CFHT). We describe our hybrid observing strategy of both tiling and galaxy-targeted observations, as well as our image differencing and transient detection pipeline. Our observing campaign produced some of the deepest multiband images of the region between 1.7 and 8.7 days post-merger, reaching a 5 sigma depth of g > 22.8 (AB mag) at 1.7 days and i > 23.1 and i > 23.9 at 3.7 and 8.7 days, respectively. These observations cover a mean total integrated probability of 67.0% of the localization region. We find no compelling candidate transient counterparts to this merger in our images, which suggests that the lighter object was tidally disrupted inside of the BH's innermost stable circular orbit, the transient lies outside of the observed sky footprint, or the lighter object is a low-mass BH. We use 5 sigma source detection upper limits from our images in the NS-BH interpretation of this merger to constrain the mass of the kilonova ejecta to be M-ej less than or similar to 0. 015M(circle dot) for a blue (kappa=0.5cm(2) g(-1)) kilonova and M-ej less than or similar to 0. 04M(circle dot) for a red (kappa=5-10 cm(2) g(-1)) kilonova. Our observations emphasize the key role of large-aperture telescopes and wide-field imagers such as CFHT MegaCam in enabling deep searches for electromagnetic counterparts to gravitational-wave events.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据