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Home > Contribution List

Contribution List

Displaying 75 contributions out of 75
Type: Oral Talk
By using a low mass supersoft source (SSS) model with magnetic confinement and Eggleton's code, we investigate the progenitors for some observed type Ia supernova (SNe Ia) with high absolute magnitude. We calculate the properties of supernova companions when the white dwarfs (WDs) of mass 1.0,1.1, and 1.2M(solar mass) grow to Chandrasekhar limit mass. We find that a low mass SSS with a magnetic WD ... More
Presented by Mr. Iminhaji ABLIMIT on 23 Apr 2013 at 4:40 PM
Type: Oral Talk
The afterglow of GRB 081029 showed unusual behavior, with a significant rebrightening being observed at optical wavelength at about 3000 s after the burst. One possible explanation is that the rebrightening is resulted from energy injection. Here, we present a detailed numerical study of the energy injection process and interpret the X-ray and optical afterglow light curves of GRB 081029. In our ... More
Presented by Mr. Yongbo YU on 25 Apr 2013 at 5:20 PM
Type: Oral Talk
Active Galactic Nuclei are the prime candidate for the acceleration of ultra-high energy cosmic rays. Their nonthermal electromagnetic spectrum reveals a population of strongly accelerated particles inside their radiation regions. This lecture will cover the possible acceleration mechanisms of particles causing this nonthermal radiation and it will deal with the question how the content of nonther ... More
Presented by Dr. Felix SPANIER on 23 Apr 2013 at 11:00 AM
Type: Oral Talk
We report the discovery of a 4.1-sigma significance 9.5 mHz QPO in Swift/XRT observation of the black hole candidate 4U 1630-472. mHz QPO with period longer than 100 seconds has never been discovered in this source. Phase-resolved spectroscopy revealed an accretion disk inner radius without significant change with phase. Phase dependent iron absorption feature has been discovered for the firs ... More
Presented by Mr. Wenda ZHANG on 25 Apr 2013 at 2:30 PM
Type: Oral Talk
If double neutron star mergers leave behind a massive magnetar rather than a black hole, a bright early afterglow can follow the gravitational wave burst (GWB) even if there is no short gamma-ray burst (SGRB) - GWB association or there is an association but the SGRB does not beam towards earth (Zhang 2012). Besides directly dissipating the proto-magnetar wind, we here suggest that the magnetar win ... More
Presented by Prof. Xuefeng WU on 24 Apr 2013 at 11:20 AM
Type: Oral Talk
Ultra-luminous X-ray sources(ULXs) are off-nuclear X-ray sources in nearby galaxies with X-ray luminosities $L_{\rm X}$ $>$ 10$^{39}$ erg s$^{-1}$. The estimates of black hole(BH) masses of ULXs is a long-standing problem. Here we estimate BH masses of ULXs from both the X-ray photon index and X-ray variability using the correlations derived from reverberation mapping active galactic nuclei (A ... More
Presented by Dr. XinLin ZHOU on 24 Apr 2013 at 5:00 PM
Type: Poster
We present the analysis of a deep Chandra observation of the tail associated with a late type galaxy--ESO 137-002 in A 3627. The tail is very narrow with a nearly constant width. Spectral analyses show that the gas in the tail has a nearly constant temperature throughout it. X-ray emission is enhanced to 2 sigma level at the position of the secondary H alpha tail revealed by SOAR. Comparisons are ... More
Presented by Mr. Biao ZHANG
Type: Lecture
Cosmic rays with energies as high as 10^20 eV have been observed, but unveiling their origins and composition is a daunting challenge due to the rarity of events at this extreme end of the energy spectrum. I'll review some of the latest efforts on this front, focusing primarily on The Pierre Auger Observatory. This observatory was designed specifically to study such ultra-high energy cosmi ... More
Presented by Dr. TOM PAUL on 22 Apr 2013 at 10:55 AM
Type: Oral Talk
to be submitted
Presented by Lian TAO on 24 Apr 2013 at 4:40 PM
Type: Poster
We have studied the luminosity functions (LFs) and X-ray Spectra of faint X-ray sources in four Galactic globular clusters (GCs, including 47 Tuc, NGC 6266, NGC 6397 and $\omega$-Cen) and a field toward the Galactic Bulge (GB), using deep {\it Chandra} observations. Our analysis of the LFs statistically accounts for the detection incompleteness and Eddington bias as well as the background source c ... More
Presented by Dr. Xiaojie XU
Presented by Dr. Xiaojie XU on 25 Apr 2013 at 11:35 AM
Type: Oral Talk
The origins of the reported two PeV neutrinos (by Ice- Cube Collaboration) are highly controversial so far. Ultra-luminous infrared galaxies (ULIRGs) are the most luminous and intense starburst galaxies in the Universe. Both their star-formation rate (SFR) and gas surface mass density are very high, implying a high supernovae rate and an efficient energy conversion of energetic protons. A small fr ... More
Presented by Dr. Hao-Ning HE on 24 Apr 2013 at 4:20 PM
Type: Poster
Physics of the X-ray state transition are still not well understood. Comparisons between the black hole systems and the neutron star systems or between the persistent sources and the transient systems are very valuable. We performed a systematic study of the spectral state transitions of Galactic X-ray binaries in the period between 2005 and 2012 with the RXTE/ASM and the Swift/BAT. We find that ... More
Presented by Dr. Hui ZHANG on 25 Apr 2013 at 5:40 PM
Type: Oral Talk
Based on data from the Fermi Gamma-ray Space Telescope, we have discovered two gigantic gamma-ray emitting bubble structures in our Milky Way (known as the Fermi bubbles), extending ~50 degrees above and below the Galactic center with a width of ~40 degrees in longitude. The gamma-ray emission associated with these bubbles has a significantly harder spectrum (dN/dE ~ E^(−2)) than the inverse ... More
Presented by Dr. Meng Su SU on 24 Apr 2013 at 3:30 PM
Type: Poster
We report the power density spectral evolution of GX 339-4 during the rising phase of four outbursts in 2002-2010. In order to probe the change in accretion geometry, we study the characteristic frequencies in the power spectra. Our results demonstrate quite uniform evolutional pattern for low frequency quasi-periodic oscillations, especially with the fact that the four cases differ great in the o ... More
Presented by Mr. Sheng-Ming(圣明) ZHENG(郑) on 25 Apr 2013 at 5:35 PM
Type: Oral Talk
Taking advantage of the type-I X-ray bursts from the hard surface of a NS of the NS XRB Aql X-1 to probe the purported corona, we found, during the bursts, a clear anti-correlation between the soft and the hard X-rays, which indicates an additional cooling of the corona with the soft X-ray shower fed by the bursts. The phenomenon was also found in IGR J17473-2721, 4U 1636-536 and 4U 1608-522. The ... More
Presented by Dr. Yu Peng CHEN on 25 Apr 2013 at 5:15 PM
Type: Oral Talk
We present the results of the long-term near infrared (NIR) photometric observations on IGR~J16318-4848. Two period of 26.7 days and 79.7 days are found in the Swift/BAT light curve. A similar 80-day period is found from the $JHK$ light curve of IGR~J16318. The 26.7-day period is interpreted as the orbital period of the system and the neutron star moves in the dense circumstellar disk of the super ... More
Presented by Dr. Jingzhi YAN on 25 Apr 2013 at 5:30 PM
Type: Lecture Track: Senior Lectures
In this talk I describe the advanced ground-based gravitational-wave detector projects (LIGO in the USA, VIRGO in Italy, GEO in Germany, KAGRA in Japan, LIGO in India). I review the status and capabilities of the detectors, and outline the different types of sources which we hope to be able to detect, and the corresponding signal characteristics and analysis pipelines. We expect that the first di ... More
Presented by BRUCE ALLEN on 22 Apr 2013 at 4:45 PM
Type: Lecture
Presented by ISABELLE GRENIER on 22 Apr 2013 at 9:00 AM
Type: Lecture Track: Senior Lectures
Presented by Prof. RALPH WIJERS on 22 Apr 2013 at 7:30 PM
Type: Lecture Track: Senior Lectures
Presented by LESLIE JOHN SAGE on 23 Apr 2013 at 7:30 PM
Type: Oral Talk
Low-mass X-ray binary transients (LMXBTs) offer a significant advantage to study accretion regimes and non-stationary accretion due to the large range and strong variation of the accretion rate on timescale of days to months. We have performed a statistical study of the outburst properties of 110 X-ray outbursts in 36 LMXBTs seen with the All-Sky Monitor (ASM; 2–12 keV) on board the Rossi X-ray ... More
Presented by Dr. Zhen YAN on 25 Apr 2013 at 2:45 PM
Type: Oral Talk
It is widely believed that supernova remnants are the main sources of Galactic cosmic rays. The maximum energy to which particles can be accelerated through diffusive shock acceleration depends on the shock velocity and magnetic field amplification upstream of the blast wave. Magnetic fields can be amplified when escaping cosmic rays trigger a return current in the plasma that drives a current dri ... More
Presented by Dr. Klara SCHURE on 23 Apr 2013 at 2:40 PM
Presented by James COLLINSON on 25 Apr 2013 at 6:10 PM
Type: Oral Talk Track: High Energy Sources: PSRs, SNR, SNe, GRBs, AGN
Measuring the spin of a black hole is important for two reasons. Firstly, it is key for our understanding of black hole physics. Secondly, it contains an imprint of the black hole’s growth history over cosmic time. Recent results from continuum fitting studies (Done et al. 2013), to determine the spin of supermassive black holes (SMBHs) in active galactic nuclei (AGN), are presented. These resul ... More
Presented by Dr. James COLLINSON
Presented by Shuangnan ZHANG on 25 Apr 2013 at 3:00 PM
Type: Oral Talk
We present the CO observations towards the well known mixed-morphology supernova remnant (SNR) IC443 to investigate its overall molecular environment. Some northern and northeastern partial shell structures of the CO gas were discovered around the remnant. It is clearly shown that one of the partial shell, about 5' extending beyond the northeastern border of the remnant's bright radio shell, seems ... More
Presented by Dr. Yang SU on 25 Apr 2013 at 5:10 PM
Type: Oral Talk Track: Senior Lectures
In the era of multi-messenger astronomy it is vital to be able to carry out prompt electromagnetic observations of non-photon triggers, to search for the counterpart to the event. Due to its efficient and flexible planning, rapid slewing and short response time, the Swift satellite is an excellent facility to use to achieve this. In this talk I will show the results of Swift follow-up of two ... More
Presented by Dr. PHILIP ANDREW EVANS on 25 Apr 2013 at 4:35 PM
Type: Oral Talk
In this talk I'll give a brief review of the current viewpoints on the possible outcome of double neutron star mergers. Special attention will be given to the possibility of forming a short-living (~100 s) supramassive neutron star. The current observational evidence will be discussed.
Presented by Prof. Yizhong FAN on 24 Apr 2013 at 11:40 AM
Presented by Shunsaku HORIUCHI
Presented by Shunsaku HORIUCHI on 24 Apr 2013 at 2:50 PM
Type: Oral Talk
High-energy (TeV-PeV) neutrinos are predicted to be produced by cosmic ray particles in gamma-ray bursts, so they are key probes of the dissipation mechanism and jet composition of GRBs. I will talk about recent progresses of the IceCube observations on GRB neutrinos and the theoretical implication. I will also talk about the ultra-high energy (EeV) neutrino emission produced by ultra-high energy ... More
Presented by Prof. Xiang-Yu WANG on 24 Apr 2013 at 10:50 AM
Type: Oral Talk
While radiation signals from extragalactic young supernovae (within about a year after the explosion) are mostly emitted in optical and near-infrared, some of them are also non-thermal emitters in radio and X-ray. The non-thermal signal comes from the hydrodynamic interaction between the expanding supernova (SN) ejecta and circumstellar materials (CSM), and has been found to be useful to probe the ... More
Presented by Dr. Keiichi MAEDA on 23 Apr 2013 at 2:00 PM
Type: Oral Talk
Magnetars are isolated neutron stars with extremely strong magnetic fields, commonly known as Soft Gamma Repeaters (SGRs) and Anomalous X-ray Pulsars (AXPs). Magnetars are persistent X-ray emitters. Occasionally they enter into active episodes, and emit X-ray bursts with luminosities anywhere between 10^{37} and 10^{45} erg/s. Persistent X-ray emission and bursts are both attributed to the decay o ... More
Presented by Dr. Lin LIN on 24 Apr 2013 at 12:00 PM
Type: Lecture
Presented by Dr. MANSI KASLIWAL on 22 Apr 2013 at 2:50 PM
Type: Lecture Track: Senior Lectures
Presented by Prof. MARTIN WARD on 25 Apr 2013 at 9:00 AM
Type: Lecture
Presented by LUKE O'CONNOR DRURY
Presented by Drury LUKE on 23 Apr 2013 at 9:00 AM
Presented by Huirong YAN on 23 Apr 2013 at 4:00 PM
Type: Oral Talk Track: Particle Acceleration Mechanisms
Recent advances in MHD turbulence call for fundamental revisions in the paradigm of cosmic ray transport and acceleration. I would like to clarify some outstanding issues related to particle transport and acceleration in realistic turbulent astrophysical environments. I shall discuss both the transport and acceleration of CRs, and demonstrate that compressible fast modes dominate t ... More
Presented by Prof. huirong YAN
The data collected by ATIC, CREAM and PAMELA all display remarkable cosmic-ray-nuclei spectrum hardening above the magnetic rigidity $\sim$ 240 GV. One natural speculation is that the primary electron spectrum also gets hardened at $\sim 240$ GeV, which can partly account for the electron/positron total spectrum excess discovered by ATIC, HESS and Fermi-LAT. The subsequent positron-to-el ... More
Presented by Dr. Lei FENG on 25 Apr 2013 at 6:05 PM
Type: Oral Talk Track: Wide-field Astronomy: Transients
The domain of impulsive radio transients is largely unexplored. Recent improvements in computational power and telescope field of view are opening up the parameter space potentially inhabited by many kinds of impulsive radio phenomena. In this talk I will describe some of the prospects for this field, as exemplified by the discovery of several bright high-dispersion measure extragalactic ("Lorim ... More
Presented by Dr. Jean-Pierre MACQUART on 25 Apr 2013 at 3:35 PM
Type: Lecture Track: Senior Lectures
Presented by LORENZO SIRONI on 23 Apr 2013 at 9:50 AM
Type: Lecture
Presented by Gallant YVES on 22 Apr 2013 at 9:50 AM
Type: Oral Talk
We report our search for γ-ray emission in the energy range from 100 MeV to 300 GeV from four Accreting Millisecond Pulsars (AMPs), SAX J1808.4−3658, IGR J00291+5934, XTE J1814−338, and XTE J0929−314, with four-year observations of Large Area Telescope (LAT) onboard the Fermi γ-ray Space Telescope. The AMPs were not detected. We obtained their γ-ray luminosity upper limits and compared wi ... More
Presented by Ms. Yi XING on 23 Apr 2013 at 5:00 PM
Type: Lecture Track: Senior Lectures
Presented by Prof. Shuangnan ZHANG on 22 Apr 2013 at 2:00 PM
Type: Poster
The diffuse interstellar dust will not only absorb those X-ray photons emitted by point source, but also scatter the X-ray, which may produce a diffuse halo around the point source. The angular distribution of halo intensity caused by single scattering can be determined by the spectrum of the point source, interstellar dust model and dust spatial distribution along the line of sight (LOS). Thus, X ... More
Presented by Mr. Junjie MAO on 25 Apr 2013 at 5:50 PM
Type: Oral Talk
The most frequently used method to estimate the BH mass of broad-line AGN and quasars is the so-called single-epoch virial BH mass estimators, in which one estimates the BH mass based on two quantities, the continuum luminosity of the AGN, and the line width of the broad emission lines, both are measured from single-epoch spectra. This method have strong assumptions about the intepretations of con ... More
Presented by Mr. Rui SHE on 23 Apr 2013 at 12:00 PM
Type: Lecture Track: Senior Lectures
Presented by JOHN CARPENTER on 22 Apr 2013 at 3:55 PM
Type: Poster
Iron-peak element distribution is very important for research of the evolution of dwarf spheroidal galaxies (dSphs). Manganese (Mn) is the most observed element for local dSphs in the iron-peak elements (except Fe). In this paper, an improved model, more reasonable supernova nucleosynthesis and supernova explosion rates are used to investigate the Mn evolution of three local dSphs: Fornax, S ... More
Presented by Dr. Menquan LIU on 25 Apr 2013 at 6:00 PM
Presented by Prof. Shu ZHANG on 25 Apr 2013 at 5:05 PM
Type: Poster
After 2010, three outbursts of H 1743-322 were detected by RXTE. We have carried out timing and spectral analysis of the data, emphasizing on the two with relatively complete evolution history presented in the RXTE/PCA observations. We then constitute an enlarged outburst sample for H 1743-322, which allows to investigate the spectral transitions in more details. We find that the spectral transiti ... More
Presented by Dr. Jianeng ZHOU on 25 Apr 2013 at 5:45 PM
Type: Oral Talk
Presented by Prof. Chengmin ZHANG on 24 Apr 2013 at 5:40 PM
Type: Poster Track: Wide-field Astronomy: Transients
We studied the energy spectral properties of the type B quasi-periodic oscillations (QPOs) and the nearby observations in the SIMS, based on Rossi X-ray Timing Explorer (RXTE)/PCA and HEXTE data of the transient black hole binary GX 339-4 four outbursts (2002,2004,2007,2010). The result shows type B QPOs distribute in the region with relatively smaller inner disk radius and higher power-law flux c ... More
Presented by Mr. Hanqin GAO
Presented by Harding ALICE on 24 Apr 2013 at 9:00 AM
Type: Oral Talk Track: Senior Lectures
Galactic supernova remnants and the extragalactic jet sources in blazars and gamma-ray bursts provide sites for some of the most energetic X-ray and gamma-ray emission seen in the cosmos. All are thought to be probable sources of cosmic rays and neutrinos, and their bright light signals are intimately connected to non-thermal leptons and hadrons accelerated in their zones of activity. This r ... More
Presented by Dr. Matthew BARING on 24 Apr 2013 at 2:00 PM
Type: Oral Talk Track: Wide-field Astronomy: Transients
Presented by Prof. VAN DER KLIS on 25 Apr 2013 at 2:00 PM
Type: Lecture Track: Wide-field Astronomy: Transients
The Pan-STARRS project is sensitive to wide range of very energetic transient phenomena including supernovae, active galaxies, tidal disruptionabstract events. I will describe some of the diverse results obtained on such events seen in extragalactic objects, including a new suggestion to explain a sub-set of these, involving micro-lensing.
Presented by Prof. Ward MARTIN
Type: Oral Talk
SkyMapper is a 1.3m wide-field survey telescope located at Siding Spring Observatory in Australia. It will carry out a comprehensive digital survey of the entire southern sky. I will give an overview of the wide range of transient science projects planned for SkyMapper, including a rolling supernova survey that aims to deliver well-calibrated data for high-precision cosmological measurements. I wi ... More
Presented by Fang YUAN on 25 Apr 2013 at 9:30 AM
Type: Oral Talk
A number of fascinating phenomena in the Universe produce transient events studied by traditional astronomy in a wide spectrum of messengers: multi-wavelength electromagnetic radiation, neutrinos and cosmic rays. Gamma ray bursts, supernovae and other violent events are hallmarks of fundamental astrophysical processes which govern the Universe. They may also produce gravitational waves (GW) p ... More
Presented by Dr. Sergey KLIMENKO on 25 Apr 2013 at 4:05 PM
Type: Oral Talk
Coronal bright points (CBPs) are long-lived small-scale brightenings in the solar corona. They are generally explained by magnetic reconnection. However, the corresponding magnetic configurations are not well understood. We carry out a detailed multi-wavelength analysis of two neighboring CBPs on 2007 March 16, observed in soft X-ray (SXR) and EUV channels. It is seen that the SXR light curves pre ... More
Presented by Mr. Qingmin ZHANG on 25 Apr 2013 at 5:25 PM
Type: Oral Talk
The type-I X-ray bursts are thermonuclear explosions on the surface of neutron stars, which can be used to probe the corona. Because of their well-known location and intensity, the seed photons from the bursts can be regarded as a shower of soft X-rays, which comptonize with the hot plasma in the corona. The cooling of the corona has been observed in IGR 17473-2721, Aqla X-1, and 4u 1636-536. The ... More
Presented by Mr. long JI on 25 Apr 2013 at 11:50 AM
Type: Oral Talk
LS I +61 303 is one of a handful of high-mass X-ray binaries that have been detected at all frequencies through radio to TeV. Its nature is still under debate, with rotationally powered pulsar-composed systems and microquasar jets being discussed. LS I +61 303 is a very bright TeV source and one of the 15th brightest GeV sources detected by Fermi. However, it enters a low TeV state and its ... More
Presented by Mr. Jian LI on 23 Apr 2013 at 3:10 PM
Presented by Shuangnan ZHANG, Wei ZHAO on 22 Apr 2013 at 8:55 AM
Type: Oral Talk
Many transient surveys are performed intensively in these days and found interesting objects that have not been detected such as superluminous supernovae, tidal disruption events, and faint supernovae. In this review, I summarize the currently-conducted transient surveys, introduce peculiar transients and their physical mechanism, and present future prospects.
Presented by Dr. Nozomu TOMINAGA on 25 Apr 2013 at 10:15 AM
Type: Oral Talk Track: Wide-field Astronomy: Transients
Presented by Prof. WIJNANDS on 25 Apr 2013 at 11:05 AM
Type: Oral Talk
Based on the Palomar Transient Factory (PTF), a major upgrade in both real-time pipeline and survey strategy has been performed in order to better detect very young supernovae and fast transients. The new phase of PTF, intermediate PTF (iPTF), started February 2013. With the new pipeline, we are able to discover a supernova candidate within 30 minutes after an image is taken. In this talk, I will ... More
Presented by Mr. Yi CAO on 25 Apr 2013 at 10:00 AM
Type: Lecture
Presented by Prof. ALBRECHT KARLE on 22 Apr 2013 at 11:45 AM
Type: Oral Talk
Presented by Dr. Shunsaku HORIUCHI
Presented by Chryssa KOUVELIOTOU on 24 Apr 2013 at 9:50 AM
Type: Oral Talk
r-mode instability in new born neutron stars (I will complete the form later)
Presented by Dr. Yun-Wei YU on 24 Apr 2013 at 5:20 PM
Type: Oral Talk
Compared with MgII, Halpha, Hbeta, the CIV mass estimator has been claimed to have a bias for high-z and and high-luminosity broad-line AGNs. We use a sample of ~70 low-redshift(z<0.8 ) AGNs with archive HST UV spectra and optical spectra from the literature(Marziani et al. 2003) to compare the CIV estimator and Hbeta estimator for the low-z and low-luminosity regime. We found that the continuum l ... More
Presented by Ms. Hong LI