A Survey for Fast Transients in the Fornax Cluster of Galaxies

Abstract

The luminosity gap between novae (M_R < -10) and supernovae (M_R > -14) is well known since the pioneering research of Zwicky and Hubble. Nearby galaxy clusters and concentrations offer an excellent opportunity to search for explosions brighter than classical novae and fainter than supernovae. Here, we present the results of a B-band survey of 23 member galaxies of the Fornax cluster, performed at the Las Campanas 2.5-m Irene duPont telescope. Observations with a cadence of 32 minutes discovered no genuine fast transient to a limiting absolute magnitude of M_B=-9.3 mag. We provide a detailed assessment of the transient detection efficiency and the resulting upper limits on the event rate as function of peak magnitude. Further, we discuss the discoveries of five previously unknown foreground variables which we identified as two flare stars, two W Uma type eclipsing binaries and a candidate delta Scuti/SX Phe star.

final version, 13 pages, 15 figures, emulateapj.sty

References in corpus (9)

• A giant outburst two years before the core-collapse of a massive star
• SN 2006gy: An extremely luminous supernova in the galaxy NGC 1260
• SN 2005ap: A Most Brilliant Explosion
• The Environment of M85 optical transient 2006-1: constraints on the progenitor age and mass
• GRB070610 : A Curious Galactic Transient
• SuperWASP-North Extrasolar Planet Candidates. Candidates from Fields 17hr < RA < 18hr
• Results from the Wide Angle Search for Planets Prototype (WASP0) II: Stellar Variability in the Pegasus Field
• RApid Temporal Survey - RATS II: Followup observations of 4 newly discovered short period variables
• Short timescale variability in the Faint Sky Variability Survey