B. Schmidt
A5023063594- Gamma-ray bursts and supernovae
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Pulsars and Gravitational Waves Research
- Astrophysics and Cosmic Phenomena
- Astro and Planetary Science
- Astrophysical Phenomena and Observations
- Astronomical Observations and Instrumentation
- SAS software applications and methods
- Astrophysics and Star Formation Studies
- Galaxies: Formation, Evolution, Phenomena
- Cosmology and Gravitation Theories
- Geophysics and Gravity Measurements
- Adaptive optics and wavefront sensing
- Radio Astronomy Observations and Technology
- Space Science and Extraterrestrial Life
- Solar and Space Plasma Dynamics
- Neutrino Physics Research
- Calibration and Measurement Techniques
- Historical Geography and Cartography
- Atmospheric Ozone and Climate
- Planetary Science and Exploration
- Geographic Information Systems Studies
- Atomic and Subatomic Physics Research
- Geological and Geophysical Studies
Australian National University
2012-2021
ARC Centre of Excellence for All-sky Astrophysics
2012-2019
Australian Research Council
2017-2019
The University of Sydney
2017-2018
Mount Stromlo Observatory
2007-2017
Tokyo Institute of Technology
2015
ACT Government
2006-2014
British Museum
2012
Association of Universities For Research In Astronomy
2000
Cerro Tololo Inter-American Observatory
1998-2000
We present spectral and photometric observations of 10 Type Ia supernovae (SNe Ia) in the redshift range 0.16 ≤ z 0.62. The luminosity distances these objects are determined by methods that employ relations between SN light curve shape. Combined with previous data from our High-z Supernova Search Team recent results Riess et al., this expanded set 16 high-redshift a 34 nearby used to place constraints on following cosmological parameters: Hubble constant (H0), mass density (ΩM), (i.e.,...
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...
The High-Z Supernova Search is an international collaboration to discover and monitor Type Ia supernovae (SNe Ia) at z > 0.2 with the aim of measuring cosmic deceleration global curvature. Our has pursued a basic understanding in nearby universe, discovering observing large sample objects developing methods measure accurate distances SNe Ia. This paper describes extension this program ≥ 0.2, outlining our search techniques follow-up program. We have devised high-throughput filters that...
We present photometric observations of an apparent Type Ia supernova (SN Ia) at a redshift ~1.7, the farthest SN observed to date. The supernova, 1997ff, was discovered in repeat observation by Hubble Space Telescope (HST) Deep Field-North (HDF-N) and serendipitously monitored with NICMOS on HST throughout Thompson et al. Guaranteed-Time Observer (GTO) campaign. type can be determined from host galaxy type: evolved, red elliptical lacking enough recent star formation provide significant...
We present constraints on the dark energy equation-of-state parameter, w=P/(rho c^2), using 60 Type Ia supernovae (SNe Ia) from ESSENCE supernova survey. derive a set of nature assuming flat Universe. By including (Omega_M, w) baryon acoustic oscillations, we obtain value for static parameter w=-1.05^{+0.13}_{-0.12} (stat; 1 sigma) +- 0.11 (sys) and Omega_M=0.274^{+0.033}_{-0.020} with best-fit chi^2/DoF 0.96. These results are consistent those reported by SuperNova Legacy Survey in similar...
We use Type Ia supernovae studied by the High-z Supernova Search Team to constrain properties of an energy component that may have contributed accelerating cosmic expansion. find for a flat geometry equation-of-state parameter unknown component, αx = Px/ρx, must be less than -0.55 (95% confidence) any value Ωm, and it is further limited < -0.60 if Ωm assumed greater 0.1. These values are inconsistent with being topological defects such as domain walls, strings, or textures. The supernova...
We present 1210 Johnson/Cousins B, V, R, and I photometric observations of 22 recent Type Ia supernovae (SNe Ia): SNe 1993ac, 1993ae, 1994M, 1994S, 1994T, 1994Q, 1994ae, 1995D, 1995E, 1995al, 1995ac, 1995ak, 1995bd, 1996C, 1996X, 1996Z, 1996ab, 1996ai, 1996bk, 1996bl, 1996bo, 1996bv. Most the photometry was obtained at Fred Lawrence Whipple Observatory Harvard-Smithsonian Center for Astrophysics in a cooperative observing plan aimed improving database Ia. The redshifts sample range from cz =...
We have coordinated Hubble Space Telescope (HST) photometry with ground-based discovery for three supernovae: Type Ia supernovae near z ≈ 0.5 (SN 1997ce, SN 1997cj) and a third event at = 0.97 1997ck). The superb spatial resolution of HST separates each supernova from its host galaxy leads to good precision in the light curves. use these curves relations between luminosity, light-curve shape, color calibrated low-z samples derive relative luminosity distances that are accurate 10% 20% 1....
The first cosmological results from the ESSENCE supernova survey (Wood-Vasey and coworkers) are extended to a wider range of models including dynamical dark energy nonstandard models. We fold in greater number external data sets such as recent Higher-z release high-redshift supernovae (Riess coworkers), well several complementary probes. Model comparison statistics Bayesian Akaike information criteria applied gauge worth These favor that give good fit with fewer parameters. Based on this...
Abstract This paper presents the design and science goals for SkyMapper telescope. is a 1.3-m telescope featuring 5.7-square-degree field-of-view Cassegrain imager commissioned Australian National University's Research School of Astronomy Astrophysics. It located at Siding Spring Observatory, Coonabarabran, NSW, Australia will see first light in late 2007. The possesses 16 384 × 0.5-arcsec pixels. primary scientific goal facility to perform Southern Sky Survey, six-colour multi-epoch...
Gamma-ray bursts (GRBs) serve as powerful probes of the early Universe, with their luminous afterglows revealing locations and physical properties star forming galaxies at highest redshifts, potentially locating first generation (Population III) stars. Since GRB have intrinsically very simple spectra, they allow robust redshifts from low signal to noise spectroscopy, or photometry. Here we present a photometric redshift z~9.4 for Swift-detected 090429B based on deep observations...
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 present the first data release (DR1) of SkyMapper Southern Survey, a hemispheric survey carried out with Telescope at Siding Spring Observatory in Australia. Here, we strategy, processing, catalogue construction and database schema. The DR1 dataset includes over 66,000 images from Shallow Survey component, covering an area 17,200 deg$^2$ all six passbands $uvgriz$, while full covered by any passband exceeds 20,000 deg$^2$. catalogues contain 285 million unique astrophysical objects,...
Fast radio bursts (FRBs) are one of the most tantalizing mysteries sky; their progenitors and origins remain unknown until now no rapid multiwavelength follow-up an FRB has been possible. New instrumentation decreased time between observation discovery from years to seconds, enables polarimetry be performed on FRBs for first time. We have discovered (FRB 140514) in real-time 14 May, 2014 at 17:14:11.06 UTC Parkes telescope triggered other wavelengths within hours event. 140514 was found with...
We present 2603 spectra of 462 nearby Type Ia supernovae (SNe Ia), including 2065 previously unpublished spectra, obtained during 1993–2008 through the Center for Astrophysics Supernova Program. There are on average eight each 313 SNe with at least two spectra. Most were FAST spectrograph Fred Lawrence Whipple Observatory 1.5 m telescope and reduced in a consistent manner, making this data set well suited studies SN spectroscopic diversity. Using additional from literature, we study...
We present comprehensive multiwavelength observations of three gamma-ray bursts (GRBs) with durations several thousand seconds. demonstrate that these events are extragalactic transients; in particular we resolve the long-standing conundrum distance GRB 101225A (the "Christmas-day burst"), finding it to have a redshift z=0.847, and showing two apparently similar (GRB 111209A 121027A) lie at z=0.677 z=1.773 respectively. The systems show extremely unusual X-ray optical lightcurves, very...
Abstract We present the second data release (DR2) of SkyMapper Southern Survey, a hemispheric survey carried out with Telescope at Siding Spring Observatory in Australia, using six optical filters: u, v, g, r, i, z . DR2 is first to go beyond $\sim\!18$ mag (10 $\sigma$ ) limit Shallow Survey released (DR1), and includes portions sky full depth that reach $>\!21$ g r filters. The photometry has precision as measured by internal reproducibility 1% u v , 0.7% griz More than 21 000 $\deg^2$...
The Public European Southern Observatory Spectroscopic Survey of Transient Objects (PESSTO) began as a public spectroscopic survey in April 2012. We describe the data reduction strategy and products which are publicly available through ESO archive Data Release 1 (SSDR1). PESSTO uses New Technology Telescope with EFOSC2 SOFI to provide optical NIR spectroscopy imaging. target supernovae transients brighter than 20.5mag for classification. Science targets then selected follow-up based on...