A5100369293- Gamma-ray bursts and supernovae
- Stellar, planetary, and galactic studies
- Astrophysics and Cosmic Phenomena
- Astrophysical Phenomena and Observations
- Pulsars and Gravitational Waves Research
- Astronomy and Astrophysical Research
- Galaxies: Formation, Evolution, Phenomena
- Astro and Planetary Science
- Particle physics theoretical and experimental studies
- Electromagnetic Scattering and Analysis
- Electromagnetic Simulation and Numerical Methods
- Advanced Antenna and Metasurface Technologies
- Neutrino Physics Research
- Particle Detector Development and Performance
- Antenna Design and Optimization
- Microwave Engineering and Waveguides
- Antenna Design and Analysis
- Quantum Chromodynamics and Particle Interactions
- Astronomical Observations and Instrumentation
- Solar and Space Plasma Dynamics
- High-Energy Particle Collisions Research
- Electromagnetic Compatibility and Measurements
- NMR spectroscopy and applications
- Cosmology and Gravitation Theories
- Astrophysics and Star Formation Studies
Institute of High Energy Physics
2008-2024
State Key Laboratory of Millimeter Waves
2011-2024
Chinese Academy of Sciences
1999-2024
Southeast University
2011-2024
University of Chinese Academy of Sciences
2019-2024
Dalian Jiaotong University
2020-2022
University of California, Berkeley
2010-2020
University of Auckland
2019
MWT Materials (United States)
2018
Shandong University
2017
We have discovered 16 Type Ia supernovae (SNe Ia) with the Hubble Space Telescope (HST) and used them to provide first conclusive evidence for cosmic deceleration that preceded current epoch of acceleration. These objects, during course GOODS ACS Treasury program, include 6 7 highest redshift SNe known, all at z > 1.25, populate diagram in unexplored territory. The luminosity distances these objects 170 previously reported been determined using empirical relations between light-curve shape...
We have discovered 21 new Type Ia supernovae (SNe Ia) with the Hubble Space Telescope (HST) and used them to trace history of cosmic expansion over last 10 billion yr. These objects, which include 13 spectroscopically confirmed SNe at z ≥ 1, were during 14 epochs reimaging GOODS fields North South 2 yr Advanced Camera for Surveys on HST. Together a recalibration our previous HST-discovered Ia, full sample 23 1 provides highest redshift known. Combining these data SN sets, we measured H(z)...
The High-z Supernova Search Team has discovered and observed 8 new supernovae in the redshift interval z=0.3-1.2. These independent observations, confirm result of Riess et al. (1998a) Perlmutter (1999) that supernova luminosity distances imply an accelerating universe. More importantly, they extend range consistently SN Ia to z~1, where signature cosmological effects opposite sign some plausible systematic effects. Consequently, these measurements not only provide another quantitative...
We use the Wide Field Camera 3 (WFC3) on Hubble Space Telescope to determine constant (H0) from optical and infrared observations of over 600 Cepheid variables in host galaxies 8 recent Type Ia supernovae (SNe Ia), providing calibration for a mag-z relation 253 SNe Ia. Increased precision past measurements comes from: (1) more than doubling number Cepheids nearby SN hosts; (2) increasing sample ideal calibrators six eight; (3) by 20% with megamaser NGC 4258; (4) reducing difference mean...
We report observations of 240 Cepheid variables obtained with the Near Infrared Camera (NICMOS) through F160W filter on Hubble Space Telescope (HST). The Cepheids are distributed across six recent hosts Type Ia supernovae (SNe Ia) and "maser galaxy" NGC 4258, allowing us to directly calibrate peak luminosities SNe from precise, geometric distance measurements provided by masers. New features our measurement include use same instrument for all ladder homogeneity periods metallicities thus...
We present an updated and revised analysis of the relationship between Hβ broad-line region (BLR) radius luminosity active galactic nucleus (AGN). Specifically, we have carried out two-dimensional surface brightness decompositions host galaxies nine new AGNs imaged with Hubble Space Telescope Wide Field Camera 3. The allow us to create "AGN-free" images galaxies, from which measure starlight contribution optical measured through ground-based spectroscopic aperture. also incorporate 20...
This is the second paper of a series in which we present new measurements observed rates supernovae (SNe) local Universe, determined from Lick Observatory Supernova Search (LOSS). In this paper, complete SN sample constructed, and (uncorrected for host-galaxy extinction) luminosity functions (LFs) SNe are derived. These LFs solve two issues that have plagued previous rate calculations nearby SNe: distribution extinction. We select volume-limited 175 SNe, collect photometry every object fit...
This is the third paper of a series in which we present new measurements observed rates supernovae (SNe) local Universe, determined from Lick Observatory Supernova Search (LOSS). We have considered sample about 1000 SNe and used an optimal subsample 726 (274 Ia, 116 Ibc, 324 II) to determine our rates. study trend as function few quantities available for galaxy sample, such luminosity B K bands, stellar mass, morphological class. discuss different choices (SN samples, input SN functions,...
We report the discovery and early observations of peculiar Type IIn supernova (SN) 2006gy in NGC 1260. With a peak visual magnitude about -22, it is most luminous ever recorded. Its very slow rise to maximum took ~70 days, stayed brighter than -21 mag for 100 days. It not yet clear what powers enormous luminosity total radiated energy ~1051 erg, but we argue that any known mechanism—thermal emission, circumstellar interaction, or 56Ni decay—requires massive progenitor star. The interaction...
We present photometric and spectroscopic observations of 23 high-redshift supernovae (SNe) spanning a range z = 0.34-1.03, nine which are unambiguously classified as Type Ia. These SNe were discovered during the IfA Deep Survey, began in 2001 September observed total 2.5 deg2 to depth approximately m ≈ 25-26 RIZ over 9-17 visits, typically every 1-3 weeks for nearly 5 months, with additional continuing until 2002 April. give brief description survey motivations, observational strategy,...
We have recently completed a 64-night spectroscopic monitoring campaign at the Lick Observatory 3-m Shane telescope with aim of measuring masses black holes in 12 nearby (z < 0.05) Seyfert 1 galaxies expected range ~10^6-10^7 M_sun and also well-studied active galactic nucleus (AGN) NGC 5548. Nine objects sample (including 5548) showed optical variability sufficient strength during to allow for time lag be measured between continuum fluctuations response these broad Hbeta emission. present...
We analyse observed fractions of core-collapse SN types from the Lick Observatory Search, and we discuss corresponding implications for massive star evolution. For a standard IMF, cannot be reconciled with expectations single-star The mass range WR stars that shed their H envelopes via own loss accounts less than half fraction SNeIbc. Progenitors SNeIbc must extend to much lower initial masses classical stars, argue most SNIbc SNIIb progenitors arise binary Roche-lobe overflow. SNeIc still...
The Carnegie Supernova Project (CSP) is a five-year survey being carried out at the Las Campanas Observatory to obtain high-quality light curves of ∼100 low-redshift Type Ia supernovae (SNe Ia) in well-defined photometric system. Here we present first release data that contains optical 35 SNe Ia, and near-infrared for subset 25 events. comprise 5559 (ugriBV) 1043 (Y JHKs) points natural system Swope telescope. Twenty-eight have pre-maximum data, 15 these, observations begin least 5 days...
In this first paper in a series we present 1298 low-redshift (z\leq0.2) optical spectra of 582 Type Ia supernovae (SNe Ia) observed from 1989 through 2008 as part the Berkeley SN Program (BSNIP). 584 199 SNe have well-calibrated light curves with measured distance moduli, and many been corrected for host-galaxy contamination. Most data were obtained using Kast double spectrograph mounted on Shane 3 m telescope at Lick Observatory typical wavelength range 3300-10,400 Ang., roughly twice wide...
We present new light curves and optical spectra for a number of extragalactic transients or 'supernova impostors' related to giant eruptions luminous blue variables (LBVs), we provide comparative discussion LBV-like known thus far. New data include photometry spectroscopy supernovae (SNe) 1999bw, 2000ch, 2001ac, 2002bu, 2006bv 2010dn. SN 2010dn appears be carbon copy 2008S NGC 300-OT, whereas 2002bu shows spectral evolution from normal LBV at early times twin these cooler late times. 2008S,...
The Carnegie Supernova Project (CSP) was a five-year observational survey conducted at Las Campanas Observatory that obtained, among other things, high-quality light curves of ~100 low-redshift Type Ia supernovae (SNe Ia). Presented here is the second data release nearby SN photometry consisting 50 objects, with subset 45 having near-infrared follow-up observations. Thirty-three objects have optical pre-maximum coverage 15 beginning least 5 days before maximum light. In near-infrared, 27...
We present final natural system optical (ugriBV) and near-infrared (YJH) photometry of 134 supernovae (SNe) with probable white dwarf progenitors that were observed in 2004-2009 as part the first stage Carnegie Supernova Project (CSP-I). The sample consists 123 Type Ia SNe, 5 Iax 2 super-Chandrasekhar SN candidates, SNe interacting circumstellar matter, 2006bt-like events. redshifts objects range from z = 0.0037 to 0.0835; median redshift is 0.0241. For 120 (90%) these was obtained. Average...
We present 30 optical spectra and 49 photometric epochs sampling the first 517 days after discovery of supernova (SN) 1999em derive its distance through expanding photosphere method (EPM). SN is shown to be a Type II‐plateau (II‐P) event, with plateau lasting until about 100 explosion. identify dominant ions responsible for most absorption features seen in portion spectrum during phase. Using weakest unblended estimate photospheric velocity, we find D = 8.2 ± 0.6 Mpc, an explosion date HJD...
We present a study of the Type IIn supernova (SN) 2005gl, in relatively nearby (d ≈ 66 Mpc) galaxy NGC 266. Photometry and spectroscopy SN indicate that it is typical member its class. Pre-explosion Hubble Space Telescope (HST) imaging location SN, along with precise localization this event using laser guide star assisted adaptive optics (LGS-AO) system at Keck Observatory, are combined to identify luminous (MV = -10.3 mag) point source as possible progenitor 2005gl. If indeed single star,...
We present the analysis of first set low-redshift Type Ia supernovae (SNe Ia) by Carnegie Supernova Project. Well-sampled, high-precision optical (ugriBV) and near-infrared (NIR; YJHKs) light curves obtained in a well-understood photometric system are used to provide light-curve parameters, ugriBVYJH template curves. The intrinsic colors at maximum calibrated compute optical--NIR color excesses for full sample, thus allowing properties reddening law host galaxies be studied. A low value...
(Abridged) To investigate the black hole mass (MBH) vs. stellar velocity dispersion relation of active galaxies, we measured dispersions a sample local Seyfert 1 for which have recently determined MBH using reverberation mapping. For most objects, were from high S/N ratio optical spectra centered on Ca II triplet region (~8500 A), obtained at Keck, Palomar, and Lick Observatories. two in was contaminated by nuclear emission, measurement based high-quality H-band with OSIRIS Keck-II...
We present photometric and spectroscopic observations of supernova (SN) 2002cx, which reveal it to be unique among all observed type Ia supernovae (SNe Ia). SN 2002cx exhibits a 1991T-like premaximum spectrum, 1991bg-like luminosity, expansion velocities roughly half those normal SNe Ia. Photometrically, has broad peak in the $R$ band plateau phase $I$ band, slow late-time decline. The $(B - V)$ color evolution is nearly normal, but $(V R)$ I)$ colors are very red. Early-time spectra evolve...
We present calibrated photometric measurements of the earliest detections nearby type Ia supernovae (SNe Ia). The set ~30 new, unfiltered CCD observations delineate early rise behavior SNe > 18 to 10 days before maximum. Using simple empirical models, we demonstrate strong correlation between risetime (i.e., time explosion and maximum), post-rise light-curve shape, peak luminosity. a variety shape methods, find B maximum for SN with Delta m15(B)=1.1 mag M_V=-19.45 be 19.5+/-0.2 days. that...
SN2006tf is the third most luminous SN discovered so far, after SN2005ap and SN2006gy. valuable because it provides a link between two regimes: (1) type IIn supernovae powered by emission directly from interaction with circumstellar material (CSM), (2) extremely SNe where CSM optically thick that energy must diffuse out an opaque shocked shell. As evolves, slowly transitions second to first regime as clumpy shell becomes more porous. This suggests range in properties of largely determined...