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A GOLDEN DECADE OF GAMMA-RAY PULSAR ASTRONOMY
Chung-Yue Hui 한국천문학회 2018 Journal of The Korean Astronomical Society Vol.51 No.6
To celebrate the tenth anniversary since the launch of {\it Fermi} Gamma-ray Space Telescope, we take a retrospect to a series of breakthroughs {\it Fermi} has contributed to pulsar astronomy in the last decade. Apart from significantly enlarging the population of $\gamma-$ray pulsars, observations with the Large Area Telescope onboard {\it Fermi} also show the population is not homogeneous. Instead, many classes and sub-classes have been revealed. In this paper, we will review the properties of different types of $\gamma-$ray pulsars, including radio-quiet $\gamma-$ray pulsars, millisecond pulsars, $\gamma-$ray binaries. Also, we will discuss the prospects of pulsar astronomy in the high energy regime.
Spider Invasion Across the Galaxy
Chung-Yue Hui 한국우주과학회 2014 Journal of Astronomy and Space Sciences Vol.31 No.2
The nature of the exotic stellar corpses which reincarnate by consuming their companion is reviewed. Apart from sucking life from their partners, they are actually eating the doomed companions away by their deadly and powerful particle/radiation beams. Such situation resembles that a female “black widow” spider that eats its mate after mating. These celestial zombies are called - Millisecond pulsars (MSPs). In this review article, I will focus on the effort of Fermi Asian Network (FAN) in exploring these intricating objects over the last five years. Two special classes of MSPs are particularly striking. Since Fermi Gamma-ray Space Telescope has started surveying the gamma-ray sky, the population of “black widows” has been boosted. Another dramatic class is so-called “redbacks” (Australian cousin of “black widows”) which has just emerged in the last few years. These MSPs provide us with a long-sought missing link in understanding the transition between accretion-powered and rotation-powered systems. The strategy of hunting MSPs through mulitwavelength observations of the unidentified Fermi objects is also reviewed.
Hui, Chung-Yue 한국우주과학회 2013 Journal of Astronomy and Space Sciences Vol.30 No.3
Here we review the effort of Fermi Asian Network (FAN) in exploring the supernova remnants (SNRs) with state-of-art high energy observatories, including Fermi Gamma-ray Space Telescope and Chandra X-ray Observatory, in the period of 2011- 2012. Utilizing the data from Fermi LAT, we have discovered the GeV emission at the position of the Galactic SNR Kes 17 which provides evidence for the hadronic acceleration. Our study also sheds light on the propagation of cosmic rays from their acceleration site to the intersteller medium. We have also launched an identification campaign of SNR candidates in the Milky Way, in which a new SNR G308.3-1.4 have been uncovered with our Chandra observation. Apart from the remnant, we have also discovered an associated compact object at its center. The multiwavelength properties of this X-ray source suggest it can possibly be the compact binary that survived a supernova explosion.
Spider Invasion Across the Galaxy
Hui, Chung-Yue The Korean Space Science Society 2014 Journal of Astronomy and Space Sciences Vol.31 No.2
The nature of the exotic stellar corpses which reincarnate by consuming their companion is reviewed. Apart from sucking life from their partners, they are actually eating the doomed companions away by their deadly and powerful particle/radiation beams. Such situation resembles that a female "black widow" spider that eats its mate after mating. These celestial zombies are called - Millisecond pulsars (MSPs). In this review article, I will focus on the effort of Fermi Asian Network (FAN) in exploring these intricating objects over the last five years. Two special classes of MSPs are particularly striking. Since Fermi Gamma-ray Space Telescope has started surveying the gamma-ray sky, the population of "black widows" has been boosted. Another dramatic class is so-called "redbacks" (Australian cousin of "black widows") which has just emerged in the last few years. These MSPs provide us with a long-sought missing link in understanding the transition between accretion-powered and rotation-powered systems. The strategy of hunting MSPs through mulitwavelength observations of the unidentified Fermi objects is also reviewed.
Pulsed γ-ray emission from magnetar 1E 2259+586
Wu, Jason Hung Kit,Hui, Chung Yue,Huang, Regina Hsiu Hui,Kong, Albert Kwok Hing,Cheng, Kwong Sang,Takata, Jumpei,Tam, Pak Hin Thomas,Wu, Eric Man Ho,Liu, Joe 한국우주과학회 2013 Journal of Astronomy and Space Sciences Vol.30 No.2
Anomalous X-ray pulsars (AXPs) are thought to be magnetars which are young isolated neutron stars with extremely strongmagnetic fields of >1014 Gauss. Their tremendous magnetic fields inferred from the spin parameters provide a huge energyreservoir to power the observed X-ray emission. High-energy emission above 0.3 MeV has never been detected despiteintensive search. Here, we present the possible Fermi Large Area Telescope (LAT) detection of γ-ray pulsations above 200MeV from the AXP, 1E 2259+586, which puts the current theoretical models of γ-ray emission mechanisms of magnetars intochallenge. We speculate that the high-energy γ-rays originate from the outer magnetosphere of the magnetar.
Exploring the Diffuse X-ray Emission of Supernova Remnant Kesteven 69 with XMM-Newton
Seo, Kyoung-Ae,Hui, Chung Yue 한국우주과학회 2013 Journal of Astronomy and Space Sciences Vol.30 No.2
We have investigated the X-ray emission from the shock-heated plasma of the Galactic supernova remnant Kesteven 69 withXMM-Newton. Assuming the plasma is at collisional ionization equilibrium, a plasma temperature and a column absorptionare found to be kT ~ 0.62 keV and NH ~ 2.85 x1022 cm-2 respectively by imaging spectroscopy. Together with the deducedemission measure, we place constraints on its Sedov parameters.
He, Song Fei(하송비),Liang, Yue Hui(양월휘),Chung, Mi Sun(정미선) 한국전시산업융합연구원 2021 한국과학예술융합학회 Vol.39 No.2
This study begins with the phenomenon that cultural conflict may occur between people with different social backgrounds, lifestyles and values in the context of social and economic globalization. Cultural conflict is one of the preconditions to promote cultural identity, and cultural identity is also the basis for the sustainable development of regional culture. With the rapid development of society and the substantial improvement of material conditions, food and clothing is no longer a social problem in China. People begin to pay attention to their own internal needs and have more diversified demands on the connotative value and presentation of food. As a symbol of regional culture, food can reflect the internal culture of the region and the social and cultural relationship between the region and other regions. It is an important carrier of the sustainable development of regional culture. In the face of the increasing demand at all levels, tangible single products can no longer meet the needs of users, thus promoting the market economy from product oriented to service-oriented competition. The purpose of this study is to deconstruct and reconstruct a variety of possibilities between regional food, regional culture and people, give play to the role of service design thinking in this process, and explore the value and significance of service design thinking in the process of sustainable development of regional food culture. Therefore, this paper attempts to use service design thinking to participate in the research process of the sustainable development of Chinese regional culture, and its methods and tools to participate in the process of regional culture characteristic food is not only the food remanufacturing and so on. The key is to study and analyze the relationship between the cultural attributes and lifestyle of regional food, create design value by means of symbols, vision, products, space and service process, and enhance the cultural significance and commercial attributes of food with the intervention of multi stakeholders. The research results and contents are as follows: firstly, as the determination and expression of regional food cultural connotation information, service design is not only the presentation of food material attribute information, but also the fundamental driving force to promote the development of intangible values (information, memory, interaction, etc.) such as its cultural attribute. Secondly, the food system involved in service design pays attention to the experience perception of users, promotes collaborative innovation activities of regional food stakeholders, maximizes the value of regional cultural information obtained by stakeholders in the service system, cooperatively creates possible solutions and improves the service quality of the food system. Thirdly, service design improves the user experience of regional food culture, explores the interactive relationship between people and time, region, culture, food and other contacts, and uses symbols and other means of information expression to play the role of people in promoting and inheriting the sustainable development of culture in the regional food system. Based on the research results, this paper looks forward to the ability and creativity of service design to solve the problem of sustainable development of food culture with regional characteristics, promote the advanced innovation of food culture with regional characteristics, and transmit and develop more diversified cultural values.