Timing techniques applied to distributed modular high-energy astronomy: the HERMES project
A. Sanna, A. F. Gambino, L. Burderi, A. Riggio, T. Di Salvo, F. Fiore, M. Lavagna, R. Bertacin, Y. Evangelista, R. Campana, F. Fuschino, P. Lunghi, A. Monge, B.… 展开作者
A. Sanna, A. F. Gambino, L. Burderi, A. Riggio, T. Di Salvo, F. Fiore, M. Lavagna, R. Bertacin, Y. Evangelista, R. Campana, F. Fuschino, P. Lunghi, A. Monge, B. Negri, S. Pirrotta, S. Puccetti, the HERMES-TP, HERMES-SP Collaborations
备注:
19 pages, 13 figures, Proceedings of SPIE Astronomical Telescopes and Instrumentation 2020
发表信息:
Proceedings Volume 11444, Space Telescopes and Instrumentation 2020: Ultraviolet to Gamma Ray; 114444X (2020)
HERMES-TP/SP(高能快速模块化卫星星座——技术与科学探路者,High Energy Rapid Modular Ensemble of Satellites -- Technologic and Scientific Pathfinder)是所谓分布式天文学概念的在轨演示项目。该项目被构想为由6颗搭载新型微型探测器的3U纳卫星组成的小型星座,旨在探测并精准定位伽马射线暴等明亮的高能暂现源。该星座探测器具备的宽能段、优异时间分辨率和大视场特性,是下一代具备良好定位能力的高能全天监测仪的核心特征,这类监测仪将在未来多信使天文学中发挥关键作用。在本研究中,我们将详细阐述利用空间分散的探测器对明亮暂现事件进行近乎同时观测,从而实现定位的定时技术。此外,我们还将定量讨论HERMES探路者的全天监测能力,以及其对探测到的伽马射线暴可达到的定位精度。
英文摘要:
The HERMES-TP/SP (High Energy Rapid Modular Ensemble of Satellites -- Technologic and Scientific Pathfinder) is an in-orbit demonstration of the so-called distributed astronomy concept. Conceived as a mini-constellation of six 3U nano-satellites hosting a new miniaturized detector, HERMES-TP/SP aims at the detection and accurate localisation of bright high-energy transients such as Gamma-Ray Bursts. The large energy band, the excellent temporal resolution and the wide field of view that characterize the detectors of the constellation represent the key features for the next generation high-energy all-sky monitor with good localisation capabilities that will play a pivotal role in the future of Multi-messenger Astronomy. In this work, we will describe in detail the temporal techniques that allow the localisation of bright transient events taking advantage of their almost simultaneous observation by spatially spaced detectors. Moreover, we will quantitatively discuss the all-sky monitor capabilities of the HERMES Pathfinder as well as its achievable accuracies on the localisation of the detected Gamma-Ray Bursts.
CubeSats Reach the Millisecond X-Ray Domain: Crab Pulsar Timing with SpIRIT/HERMES
University of Trento(特伦托大学);University of Palermo(巴勒莫大学);INAF/Osservatorio Astronomico di Trieste(意大利国家天体物理研究所的里雅斯特天文台);School of Physics, The University of Melbourne(墨尔本大学物理学院);Dipartimento di Fisica, Università degli Studi di Cagliari(卡利亚里大学物理系);INAF/IASF Palermo(意大利国家天体物理研究所巴勒莫空间物理学研究所);INAF/OAS(意大利国家天体物理研究所博洛尼亚天文台);INFN Sezione di Bologna(意大利国家核物理研究所博洛尼组分所)
GrailQuest (Gamma-ray Astronomy International Laboratory for Quantum Exploration of Space-Time) is an ambitious astrophysical mission concept that uses a fleet of small satellites whose main objective is to search for a dispersion law for light propagation in vacuo. Within Quantum Gravity theories, different models for space-time quantization predict relative discrepancies of the speed of photons w.r.t. the speed of light that depend on the ratio of the photon energy to the Planck energy. This ratio is as small as 1E-23 for photons in the gamma-ray band (100 keV). Therefore, to detect this eff…
We report the phase-connected timing ephemeris, polarization pulse profiles, Faraday rotation measurements, and Rotating-Vector-Model (RVM) fitting results of twelve millisecond pulsars (MSPs) discovered with the Five-hundred-meter Aperture Spherical radio Telescope (FAST) in the Commensal radio Astronomy FAST survey (CRAFTS). The timing campaigns were carried out with FAST and Arecibo over three years. Eleven of the twelve pulsars are in neutron star - white dwarf binary systems, with orbital periods between 2.4 and 100 d. Ten of them have spin periods, companion masses, and orbital eccentric…
Decades long monitoring of millisecond pulsars, which exhibit highly stable rotational periods, in pulsar timing array experiments is on the threshold of discovering nanohertz stochastic gravitational wave background. This paper describes the Indian Pulsar timing array (InPTA) experiment, which employs the upgraded Giant Metrewave Radio Telescope (uGMRT) for timing an ensemble of millisecond pulsars for this purpose. We highlight InPTA's observation strategies and analysis methods, which are relevant for a future PTA experiment with the more sensitive Square Kilometer Array (SKA) telescope. We…
Insight-HXMT is the first Chinese X-ray astronomical mission, launched successfully on June 15, 2017, from China's Jiuquan Satellite Launch Center. Insight-HXMT was designed to have a broad energy coverage in X-rays, from 1-250 keV, with excellent timing and adequate energy resolution at soft X-rays, and the largest effective area at hard X-rays. Here, we present a collection of papers of the Journal of High Energy Astrophysics on the Early Results of China's 1st X-ray Astronomy Satellite Insight-HXMT. These papers cover the in-orbit performance, the background model, and all calibration resul…
While observations of many high-precision radio pulsars of order $\lesssim1~μ$s across the sky are needed for the detection and characterization of a stochastic background of low-frequency gravitational waves (GWs), sensitivity to single sources of GWs requires even higher timing precision. The Argentine Institute of Radio Astronomy (IAR; Instituto Argentino de Radioastronomía) has begun observations of the brightest-known millisecond pulsar, J0437$-$4715. Even though the two antennas are smaller than other single-dish telescopes previously used for pulsar timing array (PTA) science, the IAR's…
Artificial Precision Timing Array: bridging the decihertz gravitational-wave sensitivity gap with clock satellites
Columbia University in the City of New York(纽约哥伦比亚大学);Universidade Federal de Minas Gerais(米纳斯吉拉斯联邦大学);Stanford University(斯坦福大学);Universität Heidelberg(海德堡大学);Orta Doğu Teknik Üniversitesi(中东理工大学);University of Florida(佛罗里达大学)