Skip to main content
Article thumbnail
Location of Repository

Discovery of two distant type Ia supernovae in the Hubble Deep Field-North with the Advanced Camera for Surveys

By Blakeslee JP, Tsvetanov ZI, Riess AG, Ford HC, Illingworth GD, Magee D, Tonry JL, Benitez N, Clampin M, Hartig GF, Meurer GR, Sirianni M, Ardila DR, Bartko F, Bouwens R, Broadhurst T, Cross N, Feldman PD, Franx M, Golimowski DA, Gronwall C, Kimble R, Krist J, Martel AR, Menanteau F, Miley G, Postman M, Rosati P, Sparks W, Strolger LG, Tran HD, White RL and Zheng W

Abstract

We present observations of the first two supernovae discovered with the recently installed Advanced Camera for Surveys (ACS) on the Hubble Space Telescope (HST). The supernovae were found in Wide Field Camera images of the Hubble Deep Field-North taken with the F775W, F850LP, and G800L optical elements as part of the ACS guaranteed time observation program. Spectra extracted from the ACS G800L grism exposures confirm that the objects are Type Ia supernovae (SNe Ia) at redshifts z = 0.47 and 0.95. Follow-up HST observations have been conducted with ACS in F775W and F850LP and with the Near-Infrared Camera and Multi-Object Spectrometer in the near-infrared F110W bandpass, yielding a total of nine flux measurements in the three bandpasses over a period of 50 days in the observed frame. We discuss many of the important issues in doing accurate photometry with the ACS. We analyze the multiband light curves using two different fitting methods to calibrate the supernova luminosities and place them on the SNe Ia Hubble diagram. The resulting distances are consistent with the redshift-distance relation of the accelerating universe model, although evolving intergalactic gray dust remains as a less likely possibility. The relative ease with which these SNe Ia were found, confirmed, and monitored demonstrates the potential ACS holds for revolutionizing the field of high-redshift SNe Ia and therefore of testing the accelerating universe cosmology and constraining the "epoch of deceleration.

Year: 2003
DOI identifier: 10.1086/374797
OAI identifier: oai:iris.unife.it:11392/1854086
Download PDF:
Sorry, we are unable to provide the full text but you may find it at the following location(s):
  • http://hdl.handle.net/11392/18... (external link)
  • Suggested articles


    To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.