A. Gal-yam

Publications664
h-index90
Citations26,561
Highly Influential Citations2,367
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The Palomar Transient Factory: system overview, performance and first results
The Palomar Transient Factory (PTF) is a fully-automated, wide-field survey aimed at a systematic exploration of the optical transient sky. The transient survey is performed using a new 8.1 square… Expand
Hydrogen-poor superluminous stellar explosions
TLDR
Observations of a class of luminous supernovae whose properties cannot be explained by any of the following processes: radioactive decay of freshly synthesized elements, explosion shock in the envelope of a supergiant star, and interaction between the debris and slowly moving, hydrogen-rich circumstellar material. Expand
Chemical evolution of the Galactic bulge as traced by microlensed dwarf and subgiant stars - V. Evidence for a wide age distribution and a complex MDF
Based on high-resolution spectra obtained during gravitational microlensing events we present a detailed elemental abundance analysis of 32 dwarf and subgiant stars in the Galactic bulge. Combined… Expand
Luminous Supernovae
TLDR
High-resolution spectroscopy of the supernova PTF 11kx is reported, which was detected on 26 January 2011 by the Palomar Transient Factory survey, and the data suggest a red giant star companion whose material got transferred to the white dwarf. Expand
Relativistic ejecta from X-ray flash XRF 060218 and the rate of cosmic explosions
TLDR
Radio and X-ray observations of XRF 060218 (associated with supernova SN 2006aj), the second-nearest GRB identified until now, are reported, showing that this event is a hundred times less energetic but ten times more common than cosmological GRBs. Expand
Supernova SN 2011fe from an exploding carbon–oxygen white dwarf star
TLDR
Early observations of type Ia supernova SN 2011fe in the galaxy M101 at a distance from Earth of 6.4 megaparsecs find that the exploding star was probably a carbon–oxygen white dwarf, and from the lack of an early shock it is concluded that the companion was likely a main-sequence star. Expand
An extremely luminous X-ray outburst at the birth of a supernova
TLDR
This work reports the serendipitous discovery of a supernova at the time of the explosion, marked by an extremely luminous X-ray outburst, and attributes the outburst to the ‘break-out’ of the supernova shock wave from the progenitor star, and shows that the inferred rate of such events agrees with that of all core-collapse supernovae. Expand
LSST Science Book, Version 2.0
A survey that can cover the sky in optical bands over wide fields to faint magnitudes with a fast cadence will enable many of the exciting science opportunities of the next decade. The Large Synoptic… Expand
The Supernova Delay Time Distribution in Galaxy Clusters and Implications for Type-Ia Progenitors and Metal Enrichment
Knowledge of the supernova (SN) delay time distribution (DTD)-the SN rate versus time that would follow a hypothetical brief burst of star formation-can shed light on SN progenitors and physics, as… Expand
A continuum of H- to He-rich tidal disruption candidates with a preference for E+A galaxies
We present the results of a Palomar Transient Factory (PTF) archival search for blue transients that lie in the magnitude range between "normal" core-collapse and superluminous supernovae (i.e., with… Expand
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