PMO OpenIR中国科学院国家科学图书馆机构知识库http://libir.pmo.ac.cn:802018-07-18T06:47:08Z2018-07-18T06:47:08ZMassive black holes and tidal disruption events at the center of galaxiesLiu ZhuYuan WeiminSun HuiLi ShuoLiu FukunChen XianLu YoujunWang TingguiLei WeihuaZhong ShiyanYuan FengWang JunfengLi ZhuoLi LixinFan YizhongZhou Hongyanhttp://libir.pmo.ac.cn:80/handle/332002/180022018-07-16T16:39:16Z2018-07-16T10:09:51Z题名: Massive black holes and tidal disruption events at the center of galaxies
作者: Liu Zhu; Yuan Weimin; Sun Hui; Li Shuo; Liu Fukun; Chen Xian; Lu Youjun; Wang Tinggui; Lei Weihua; Zhong Shiyan; Yuan Feng; Wang Junfeng; Li Zhuo; Li Lixin; Fan Yizhong; Zhou Hongyan
摘要: When a star enters the tidal radius of a massive black hole (BH) at the center of a galaxy, the tidal force will rip the star apart. The BH may accrete the debris of the star and produce energetic flare. This phenomenon is now commonly known as Tidal Disruption Event (TDE). The characteristics of its spectra as well as variability are dependent on the properties of the central BH and the disrupted star, so that we can study their parameters, accretion process and jet, and the property of circumnuclear environment by confirming and systematically studying the BH in quiescent galaxies. TDE may also provide important clues on the existence of intermediate BH as well as supermassive BH binary. However, the study of TDE is hindered by relatively small sample size (especially in X-ray band) and low quality of data due to the low incident rate. The Einstein Probe (EP), which covers the 0.5-4 keV soft X-ray energy band, has a large field of view as well as high sensitivity, making it perfect to detect TDE. We expect that EP will detect several tens to about one hundred TDE every year, of which around 10 or even more are TDE with relativistic jet. This will result in a homogeneously selected completely TDE sample, which is important for investigating the statistical property of TDE. It makes it possible to investigate the existence and statistical property of BH, explore the growth and evolution of BH, discovery the intermediate BH as well as supermassive BH binaries.2018-07-16T10:09:51ZExplaining the DAMPE data with scalar dark matter and gauged U(1)(Le- L mu) interactionCao, JunjieFeng, LeiGuo, XiaofeiShang, LiangliangWang, FeiWu, PeiwenZu, Leihttp://libir.pmo.ac.cn:80/handle/332002/180012018-07-16T16:39:19Z2018-07-16T10:09:48Z题名: Explaining the DAMPE data with scalar dark matter and gauged U(1)(Le- L mu) interaction
作者: Cao, Junjie; Feng, Lei; Guo, Xiaofei; Shang, Liangliang; Wang, Fei; Wu, Peiwen; Zu, Lei
摘要: Inspired by the peak structure observed by recent DAMPE experiment in e(+)e(-) cosmic-ray spectrum, we consider a scalar dark matter (DM) model with gauged U(1)(Le-L mu) symmetry, which is the most economical anomaly-free theory to potentially explain the peak by DM annihilation in nearby subhalo. We utilize the process chi chi -> Z'Z' -> l (l) over barl'(l) over bar' , where chi, Z', l(()'()) denote the scalar DM, the new gauge boson and l(()'()) = e, mu, respectively, to generate the e(+)e(-) spectrum. By fitting the predicted spectrum to the experimental data, we obtain the favored DM mass range m(chi) similar or equal to 3060(-100)(+80) GeV and Delta m = m(chi) - m(Z') less than or similar to 14 GeV at 68% Confidence Level (C.L.). Furthermore, we determine the parameter space of the model which can explain the peak and meanwhile satisfy the constraints from DM relic abundance, DM direct detection and the collider bounds. We conclude that the model we consider can account for the peak, although there exists a tension with the constraints from the LEP-II bound on m(Z') arising from the cross section measurement of e(+)e(-) -> Z'* -> e(+)e(-).2018-07-16T10:09:48ZTheoretical scaling law of coronal magnetic field and electron power-law index in solarmicrowave burst sourcesHuang, Y.Song, Q. W.Tan, B. L.http://libir.pmo.ac.cn:80/handle/332002/180002018-07-16T16:39:20Z2018-07-16T10:09:46Z题名: Theoretical scaling law of coronal magnetic field and electron power-law index in solarmicrowave burst sources
作者: Huang, Y.; Song, Q. W.; Tan, B. L.
摘要: It is first proposed a theoretical scaling law respectively for the coronal magnetic field strength B and electron power-law index delta versus frequency and coronal height in solar microwave burst sources. Based on the non-thermal gyro-synchrotron radiation model (Ramaty in Astrophys. J. 158:753, 1969), B and delta are uniquely solved by the observable optically-thin spectral index and turnover (peak) frequency, the other parameters (plasma density, temperature, view angle, low and high energy cutoffs, etc.) are relatively insensitive to the calculations, thus taken as some typical values. Both of B and delta increase with increasing of radio frequency but with decreasing of coronal height above photosphere, and well satisfy a square or cubic logarithmic fitting.2018-07-16T10:09:46ZNeutrinos from Choked Jets Accompanied by Type-II SupernovaeHe, Hao-NingKusenko, AlexanderNagataki, ShigehiroFan, Yi-ZhongWei, Da-Minghttp://libir.pmo.ac.cn:80/handle/332002/179992018-07-16T16:39:21Z2018-07-16T10:09:43Z题名: Neutrinos from Choked Jets Accompanied by Type-II Supernovae
作者: He, Hao-Ning; Kusenko, Alexander; Nagataki, Shigehiro; Fan, Yi-Zhong; Wei, Da-Ming
摘要: The origin of the IceCube neutrinos is still an open question. Upper limits from diffuse gamma-ray observations suggest that the neutrino sources are either distant or hidden from gamma-ray observations. It is possible that the neutrinos are produced in jets that are formed in core-collapsing massive stars and fail to break out, the so-called choked jets. We study neutrinos from the jets choked in the hydrogen envelopes of red supergiant stars. Fast photo-meson cooling softens the neutrino spectrum, making it hard to explain the PeV neutrinos observed by IceCube in a one-component scenario, but a two-component model can explain the spectrum. Furthermore, we predict that a newly born jet-driven type-II supernova may be observed to be associated with a neutrino burst detected by IceCube.2018-07-16T10:09:43ZPhotometric Solutions of Three Eclipsing Binary Stars Observed from Dome A, AntarcticaLiu, N.Fu, J. N.Zong, W.Wang, L. Z.Uddin, S. A.Zhang, X. B.Zhang, Y. P.Cang, T. Q.Li, G.Yang, Y.Yang, G. C.Mould, J.Morrell, N.http://libir.pmo.ac.cn:80/handle/332002/179982018-07-16T16:39:23Z2018-07-16T10:09:41Z题名: Photometric Solutions of Three Eclipsing Binary Stars Observed from Dome A, Antarctica
作者: Liu, N.; Fu, J. N.; Zong, W.; Wang, L. Z.; Uddin, S. A.; Zhang, X. B.; Zhang, Y. P.; Cang, T. Q.; Li, G.; Yang, Y.; Yang, G. C.; Mould, J.; Morrell, N.
摘要: Based on spectroscopic observations for the eclipsing binaries CSTAR 036162 and CSTAR 055495 with the WiFeS/2.3 m telescope at SSO and CSTAR 057775 with the Mage/Magellan I at LCO in 2017, stellar parameters are derived. More than 100 nights of almost-continuous light curves reduced from the time-series photometric observations by CSTAR at Dome A of Antarctic in i in 2008 and in g and r in 2009, respectively, are applied to find photometric solutions for the three binaries with the Wilson-Devinney code. The results show that CSTAR 036162 is a detached configuration with the mass ratio q = 0.354 +/- 0.0009, while CSTAR 055495 is a semi-detached binary system with the unusual q = 0.946 +/- 0.0006, which indicates that CSTAR 055495 may be a rare binary system with mass ratio close to one and the secondary component filling its Roche Lobe. This implies that a mass-ratio reversal has just occurred and CSTAR 055495 is in a rapid mass-transfer stage. Finally, CSTAR 057775 is believed to be an A-type W UMa binary with q = 0.301 +/- 0.0008 and a fill-out factor of f = 0.742(8).2018-07-16T10:09:41ZShort GRBs: Opening Angles, Local Neutron Star Merger Rate, and Off-axis Events for GRB/GW AssociationJin, Zhi-PingLi, XiangWang, HaoWang, Yuan-ZhuHe, Hao-NingYuan, QiangZhang, Fu-WenZou, Yuan-ChuanFan, Yi-ZhongWei, Da-Minghttp://libir.pmo.ac.cn:80/handle/332002/179972018-07-16T16:39:24Z2018-07-16T10:09:37Z题名: Short GRBs: Opening Angles, Local Neutron Star Merger Rate, and Off-axis Events for GRB/GW Association
作者: Jin, Zhi-Ping; Li, Xiang; Wang, Hao; Wang, Yuan-Zhu; He, Hao-Ning; Yuan, Qiang; Zhang, Fu-Wen; Zou, Yuan-Chuan; Fan, Yi-Zhong; Wei, Da-Ming
摘要: The jet breaks in the afterglow light curves of short gamma-ray bursts (SGRBs), rarely detected so far, are crucial for estimating the half-opening angles of the ejecta (theta(j)) and hence the neutron star merger rate. In this work, we report the detection of jet decline behaviors in GRB 150424A and GRB 160821B, and find theta j similar to 0.1 rad. Together with five events reported before 2015 and three others "identified" recently (GRB 050709, GRB 060614, and GRB 140903A), we have a sample consisting of nine SGRBs and one long-short GRB with reasonably estimated theta(j). In particular, three Swift bursts in the sample have redshifts z <= 0.2, with which we estimate the local neutron star merger rate density to be similar to 1109(-657)(+1432) Gpc(-3) yr(-1) or 162(-83)(+140) Gpc(-3) yr(-1) if the narrowly beamed GRB 061201 is excluded. Inspired by the typical theta(j) similar to 0.1 rad found currently, we further investigate whether the off-beam GRBs (in the uniform jet model) or the off-axis events (in the structured jet model) can significantly enhance the GRB/GW association. For the former, the enhancement is at most moderate, while for the latter the enhancement can be much greater and a high GRB/GW association probability of similar to 10% is possible. We also show that the data of GRB 160821B may contain a macronova/kilonova emission component with a temperature of similar to 3100 K at similar to 3.6 days after the burst and more data are needed to ultimately clarify.2018-07-16T10:09:37ZMeasuring patchy reionization with kSZ(2)-21 cm correlationsMa, Q.Helgason, K.Komatsu, E.Ciardi, B.Ferrara, A.http://libir.pmo.ac.cn:80/handle/332002/179962018-07-16T16:39:25Z2018-07-16T10:09:32Z题名: Measuring patchy reionization with kSZ(2)-21 cm correlations
作者: Ma, Q.; Helgason, K.; Komatsu, E.; Ciardi, B.; Ferrara, A.
摘要: We study cross-correlations of the kinetic Sunyaev-Zel'dovich effect (kSZ) and 21 cm signals during the epoch of reionization (EoR) to measure the effects of patchy reionisation. Since the kSZ effect is proportional to the line-of-sight velocity, the kSZ-21 cm cross correlation suffers from cancellation at small angular scales. We thus focus on the correlation between the kSZ-squared field (kSZ(2)) and 21 cm signals. When the global ionization fraction is low (x(e) less than or similar to 0.7), the kSZ(2) fluctuation is dominated by rare ionized bubbles, which leads to an anticorrelation with the 21 cm signal. When 0.8 less than or similar to x(e) < 1, the correlation is dominated by small pockets of neutral regions, leading to a positive correlation. However, at very high redshifts when x(e) < 0.15, the spin temperature fluctuations change the sign of the correlation from negative to positive, as weakly ionized regions can have strong 21 cm signals in this case. To extract this correlation, we find that Wiener filtering is effective in removing large signals from the primary cosmic microwave background (CMB) anisotropy. The expected signal-to-noise ratios for a similar to 10-h integration of upcoming Square Kilometre Array data cross-correlated with maps from the current generation of CMB observatories with 3.4 mu K arcmin noise and 1.7 arcmin beam over 100 deg(2) are 51, 60, and 37 for x(e) = 0.2, 0.5, and 0.9, respectively.2018-07-16T10:09:32ZGW170817 and the Prospect of Forming Supramassive Remnants in Neutron Star MergersMa, Peng-XiongJiang, Jin-LiangWang, HaoJin, Zhi-PingFan, Yi-ZhongWei, Da-Minghttp://libir.pmo.ac.cn:80/handle/332002/179952018-07-16T16:39:26Z2018-07-16T10:09:30Z题名: GW170817 and the Prospect of Forming Supramassive Remnants in Neutron Star Mergers
作者: Ma, Peng-Xiong; Jiang, Jin-Liang; Wang, Hao; Jin, Zhi-Ping; Fan, Yi-Zhong; Wei, Da-Ming
摘要: The gravitational wave data of GW170817 favor the equation of state (EoS) models that predict compact neutron stars (NSs), consistent with the radius constraints from X-ray observations. Motivated by such remarkable progress, we examine the fate of the remnants formed in NS mergers and focus on the roles of the angular momentum and the mass distribution of the binary NSs. In the mass-shedding limit (for which the dimensionless angular momentum equals the Keplerian value, i.e., j = j(Kep)), the adopted seven EoS models, except for H4 and ALF2, yield supramassive NSs in more than half of the mergers. However, for j less than or similar to 0.7 j(Kep), the presence or absence of a non-negligible fraction of supramassive NSs formed in the mergers depends sensitively on both the EoS and the mass distribution of the binary systems. The NS mergers with a total gravitational mass less than or similar to 2.6M(circle dot) are found to be able to shed valuable light on both the EoS model and the angular momentum of the remnants if supramassive NSs are still absent. We have also discussed the uncertainty on estimating the maximum gravitational mass of nonrotating NSs (M-max) due to the unknown j of the precollapse remnants. With the data of GW170817 and the assumption of the mass loss of 0.03 M-circle dot, we have M-max < (2.19, 2.32) M-circle dot (90% confidence level) for j = (1.0, 0.8) j(Kep), respectively.2018-07-16T10:09:30ZChallenging local realism with human choicesAbellan, C.Acin, A.Alarcon, A.Alibart, O.Andersen, C. K.Andreoli, F.Beckert, A.Beduini, F. A.Bendersky, A.Bentivegna, M.Bierhorst, P.Burchardt, D.Cabello, A.Carine, J.Carrasco, S.Carvacho, G.Cavalcanti, D.Chaves, R.Cortes-Vega, J.Cuevas, A.Delgado, A.de Riedmatten, H.Eichler, C.Farrera, P.Fuenzalida, J.Garcia-Matos, M.Garthoff, R.Gasparinetti, S.Gerrits, T.Jouneghani, F. GhafariGlancy, S.Gomez, E. S.Gonzalez, P.Guan, J-YHandsteiner, J.Heinsoo, J.Heinze, G.Hirschmann, A.Jimenez, O.Kaiser, F.Knill, E.Knoll, L. T.Krinner, S.Kurpiers, P.Larotonda, M. A.Larsson, J-ALenhard, A.Li, H.Li, M-HLima, G.Liu, B.Liu, Y.Lopez Grande, I. H.Lunghi, T.Ma, X.Magana-Loaiza, O. S.Magnard, P.Magnoni, A.Marti-Prieto, M.Martinez, D.Mataloni, P.Mattar, A.Mazzera, M.Mirin, R. P.Mitchell, M. W.Nam, S.Oppliger, M.Pan, J-WPatel, R. B.Pryde, G. J.Rauch, D.Redeker, K.Rielander, D.Ringbauer, M.Roberson, T.Rosenfeld, W.Salathe, Y.Santodonato, L.Sauder, G.Scheidl, T.Schmiegelow, C. T.Sciarrino, F.Seri, A.Shalm, L. K.Shi, S-CSlussarenko, S.Stevens, M. J.Tanzilli, S.Toledo, F.Tura, J.Ursin, R.Vergyris, P.Verma, V. B.Walter, T.Wallraff, A.Wang, Z.Weinfurter, H.Weston, M. M.White, A. G.Wu, C.Xavier, G. B.You, L.Yuan, X.Zeilinger, A.Zhang, Q.Zhang, W.Zhong, J.http://libir.pmo.ac.cn:80/handle/332002/179942018-07-16T16:39:30Z2018-07-16T10:09:22Z题名: Challenging local realism with human choices
作者: Abellan, C.; Acin, A.; Alarcon, A.; Alibart, O.; Andersen, C. K.; Andreoli, F.; Beckert, A.; Beduini, F. A.; Bendersky, A.; Bentivegna, M.; Bierhorst, P.; Burchardt, D.; Cabello, A.; Carine, J.; Carrasco, S.; Carvacho, G.; Cavalcanti, D.; Chaves, R.; Cortes-Vega, J.; Cuevas, A.; Delgado, A.; de Riedmatten, H.; Eichler, C.; Farrera, P.; Fuenzalida, J.; Garcia-Matos, M.; Garthoff, R.; Gasparinetti, S.; Gerrits, T.; Jouneghani, F. Ghafari; Glancy, S.; Gomez, E. S.; Gonzalez, P.; Guan, J-Y; Handsteiner, J.; Heinsoo, J.; Heinze, G.; Hirschmann, A.; Jimenez, O.; Kaiser, F.; Knill, E.; Knoll, L. T.; Krinner, S.; Kurpiers, P.; Larotonda, M. A.; Larsson, J-A; Lenhard, A.; Li, H.; Li, M-H; Lima, G.; Liu, B.; Liu, Y.; Lopez Grande, I. H.; Lunghi, T.; Ma, X.; Magana-Loaiza, O. S.; Magnard, P.; Magnoni, A.; Marti-Prieto, M.; Martinez, D.; Mataloni, P.; Mattar, A.; Mazzera, M.; Mirin, R. P.; Mitchell, M. W.; Nam, S.; Oppliger, M.; Pan, J-W; Patel, R. B.; Pryde, G. J.; Rauch, D.; Redeker, K.; Rielander, D.; Ringbauer, M.; Roberson, T.; Rosenfeld, W.; Salathe, Y.; Santodonato, L.; Sauder, G.; Scheidl, T.; Schmiegelow, C. T.; Sciarrino, F.; Seri, A.; Shalm, L. K.; Shi, S-C; Slussarenko, S.; Stevens, M. J.; Tanzilli, S.; Toledo, F.; Tura, J.; Ursin, R.; Vergyris, P.; Verma, V. B.; Walter, T.; Wallraff, A.; Wang, Z.; Weinfurter, H.; Weston, M. M.; White, A. G.; Wu, C.; Xavier, G. B.; You, L.; Yuan, X.; Zeilinger, A.; Zhang, Q.; Zhang, W.; Zhong, J.
摘要: A Bell test is a randomized trial that compares experimental observations against the philosophical worldview of local realism(1), in which the properties of the physical world are independent of our observation of them and no signal travels faster than light. A Bell test requires spatially distributed entanglement, fast and high-efficiency detection and unpredictable measurement settings(2,3). Although technology can satisfy the first two of these requirements(4-7), the use of physical devices to choose settings in a Bell test involves making assumptions about the physics that one aims to test. Bell himself noted this weakness in using physical setting choices and argued that human 'free will' could be used rigorously to ensure unpredictability in Bell tests(8). Here we report a set of local-realism tests using human choices, which avoids assumptions about predictability in physics. We recruited about 100,000 human participants to play an online video game that incentivizes fast, sustained input of unpredictable selections and illustrates Bell-test methodology(9). The participants generated 97,347,490 binary choices, which were directed via a scalable web platform to 12 laboratories on five continents, where 13 experiments tested local realism using photons(5,6), single atoms(7), atomic ensembles(10) and superconducting devices(11). Over a 12-hour period on 30 November 2016, participants worldwide provided a sustained data flow of over 1,000 bits per second to the experiments, which used different human-generated data to choose each measurement setting. The observed correlations strongly contradict local realism and other realistic positions in bipartite and tripartite(12) scenarios. Project outcomes include closing the 'freedom-of-choice loophole' (the possibility that the setting choices are influenced by 'hidden variables' to correlate with the particle properties(13)), the utilization of video-game methods(14) for rapid collection of human-generated randomness, and the use of networking techniques for global participation in experimental science.2018-07-16T10:09:22ZScalar dark matter interpretation of the DAMPE data with U(l) gauge InteractionsCao, JunjieFeng, LeiGuo, XiaofeiShang, LiangliangWang, FeiWu, Peiwenhttp://libir.pmo.ac.cn:80/handle/332002/179932018-07-16T16:39:31Z2018-07-16T10:09:19Z题名: Scalar dark matter interpretation of the DAMPE data with U(l) gauge Interactions
作者: Cao, Junjie; Feng, Lei; Guo, Xiaofei; Shang, Liangliang; Wang, Fei; Wu, Peiwen
摘要: Recently, the Dark Matter Particle Explorer (DAMPE) experiment released the new measurement of the total cosmic e(+) e(-) flux between 25 GeV and 4.6 TeV, which indicates a spectral softening at around 0.9 TeV and a tentative peak at around 1.4 TeV. We utilize a scalar dark matter (DM) model to explain the DAMPE peak by XX -> Z'Z' -> l (l) over barl'(l) over bar 'l with an additional anomaly-free gauged U (l) family symmetry, in which X, Z'and l((')) denote, respectively, the scalar DM, the new gauge boson, and l((')) = e, mu, tau, with m(x) similar to m(z)' similar to 2 x 1.5 (TeV). We first illustrate that the minimal framework Gsm X U(l)(Y') with the above mass choices can explain the DAMPE excess, which, however, be excluded by LHC constraints from the Z' searches. Then, we study a nonminimal framework G(SM) X U(l)(Y') x U(i)(Y") in which U(l)(Y") mixes with U(l)(Y'). We show that such a framework can interpret the DAMPE data and at the same time survive all other constraints including the DM relic abundance, DM direct detection, and collider bounds. We also investigate the predicted e(+) e(-) spectrum in this framework and find that the mass splitting Delta m = m(x) - m(z") should be less than about 17 GeV to produce the peaklike structure.2018-07-16T10:09:19Z