The supernova SN 2005cz has recently attracted some attention, due to the fact that it was spectr... more The supernova SN 2005cz has recently attracted some attention, due to the fact that it was spectroscopically similar to type Ib supernovae (SNe), a class that is presumed to result from core-collapse of massive stars, yet it occurred in an elliptical galaxy, where one expects very few massive stars to exist. Two explanations for this remarkable event were put forward.
We have begun a new multi-wavelength project to explore the interaction history and evolution of ... more We have begun a new multi-wavelength project to explore the interaction history and evolution of galaxies in clusters. As a cluster hierarchically grows, gravitational and gas dynamical effects (e.g. galaxy-galaxy interactions, harassment, ram pressure stripping, starvation) are capable of removing stars, gas, and dust from galaxies. The intracluster light (ICL) therefore holds a record of the growth history of the
We report on the discovery and observations of the extremely luminous optical transient CSS100217... more We report on the discovery and observations of the extremely luminous optical transient CSS100217:102913+404220 (CSS100217 hereafter). Spectroscopic observations showed that this transient was coincident with a galaxy at redshift z = 0.147 and reached an apparent magnitude of V ~ 16.3. After correcting for foreground Galactic extinction we determine the absolute magnitude to be MV = -22.7 approximately 45 days
Quantitative analysis of 24 high-z (zmed = 0.81) Type Ia supernovae (SNe Ia) spectra observed at ... more Quantitative analysis of 24 high-z (zmed = 0.81) Type Ia supernovae (SNe Ia) spectra observed at the Gemini Telescopes for the Supernova Legacy Survey (SNLS) is presented. This analysis includes equivalent width measurements of SNe Ia-specific absorption features with methods tailored to the reduced signal-to-noise and host galaxy contamination present in these distant spectra. The results from this analysis are
The high-redshift SN Ia data are taken from the SNLS. This programme used optical imaging data ta... more The high-redshift SN Ia data are taken from the SNLS. This programme used optical imaging data taken as part of the deep component of the five-year Canada-France-Hawaii Telescope Legacy Survey (CFHT-LS) using the square-degree 'MegaCam' camera, located in the prime focus environment 'MegaPrime' on the CFHT. (1 data file).
We report the discovery of LSR1826+3014, a very faint (V=19.36) star with a very large proper mot... more We report the discovery of LSR1826+3014, a very faint (V=19.36) star with a very large proper motion (µ = 2.38'' yr−1). A low resolution red spectrum reveals that LSR1826+3014 is an ultra-cool red dwarf with spectral type M8.5 V and with a radial velocity vrad = +77 ±10km s−1. LSR1826+3014 is thus the faintest red dwarf ever discovered with a
Peter Nugent, 1 Mark Sullivan, 2 Richard Ellis, 3 Avishay Gal-Yam, 3, 4 Douglas C. Leonard, 3, 5 ... more Peter Nugent, 1 Mark Sullivan, 2 Richard Ellis, 3 Avishay Gal-Yam, 3, 4 Douglas C. Leonard, 3, 5 D. Andrew Howell, 2 ... Pierre Astier, 6 Raymond G. Carlberg, 2 Alex Conley, 2 Sebastien Fabbro, 7 Dominique Fouchez, 8 ... James D. Neill, 9 Reynald Pain, 6 Kathy Perrett, 2 ...
The supernova SN 2005cz has recently attracted some attention, due to the fact that it was spectr... more The supernova SN 2005cz has recently attracted some attention, due to the fact that it was spectroscopically similar to type Ib supernovae (SNe), a class that is presumed to result from core-collapse of massive stars, yet it occurred in an elliptical galaxy, where one expects very few massive stars to exist. Two explanations for this remarkable event were put forward.
We have begun a new multi-wavelength project to explore the interaction history and evolution of ... more We have begun a new multi-wavelength project to explore the interaction history and evolution of galaxies in clusters. As a cluster hierarchically grows, gravitational and gas dynamical effects (e.g. galaxy-galaxy interactions, harassment, ram pressure stripping, starvation) are capable of removing stars, gas, and dust from galaxies. The intracluster light (ICL) therefore holds a record of the growth history of the
We report on the discovery and observations of the extremely luminous optical transient CSS100217... more We report on the discovery and observations of the extremely luminous optical transient CSS100217:102913+404220 (CSS100217 hereafter). Spectroscopic observations showed that this transient was coincident with a galaxy at redshift z = 0.147 and reached an apparent magnitude of V ~ 16.3. After correcting for foreground Galactic extinction we determine the absolute magnitude to be MV = -22.7 approximately 45 days
Quantitative analysis of 24 high-z (zmed = 0.81) Type Ia supernovae (SNe Ia) spectra observed at ... more Quantitative analysis of 24 high-z (zmed = 0.81) Type Ia supernovae (SNe Ia) spectra observed at the Gemini Telescopes for the Supernova Legacy Survey (SNLS) is presented. This analysis includes equivalent width measurements of SNe Ia-specific absorption features with methods tailored to the reduced signal-to-noise and host galaxy contamination present in these distant spectra. The results from this analysis are
The high-redshift SN Ia data are taken from the SNLS. This programme used optical imaging data ta... more The high-redshift SN Ia data are taken from the SNLS. This programme used optical imaging data taken as part of the deep component of the five-year Canada-France-Hawaii Telescope Legacy Survey (CFHT-LS) using the square-degree 'MegaCam' camera, located in the prime focus environment 'MegaPrime' on the CFHT. (1 data file).
We report the discovery of LSR1826+3014, a very faint (V=19.36) star with a very large proper mot... more We report the discovery of LSR1826+3014, a very faint (V=19.36) star with a very large proper motion (µ = 2.38'' yr−1). A low resolution red spectrum reveals that LSR1826+3014 is an ultra-cool red dwarf with spectral type M8.5 V and with a radial velocity vrad = +77 ±10km s−1. LSR1826+3014 is thus the faintest red dwarf ever discovered with a
Peter Nugent, 1 Mark Sullivan, 2 Richard Ellis, 3 Avishay Gal-Yam, 3, 4 Douglas C. Leonard, 3, 5 ... more Peter Nugent, 1 Mark Sullivan, 2 Richard Ellis, 3 Avishay Gal-Yam, 3, 4 Douglas C. Leonard, 3, 5 D. Andrew Howell, 2 ... Pierre Astier, 6 Raymond G. Carlberg, 2 Alex Conley, 2 Sebastien Fabbro, 7 Dominique Fouchez, 8 ... James D. Neill, 9 Reynald Pain, 6 Kathy Perrett, 2 ...
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