The discovery of a type Ia supernova at a redshift of 0.31

Nørgaard-Nielsen, H. U.; Hansen, L.; Jørgensen, H. E.; Salamanca, Alfonso Aragón; Ellis, Richard S.; Couch, Warrick J.

doi:10.1038/339523a0

Cited by 115 publications

(75 citation statements)

References 11 publications

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“…SOME q 0 ISSUES Already about ten SNe Ia in the redshift range 0.3 ≃ z ≃ 0.5 have been discovered (Norgaard-Nielsen et al 1989;, 1995a, Schmidt et al 1995. Preliminary indications are that when the eight remote SNe Ia found by the LBL group are matched to nearer SNe Ia on the basis of light-curve width -using the LBL "stretch factor" in lieu of ∆m 15 (B) or LCS -the value of q 0 comes out to be near 0.5 (Perlmutter et al 1995b).…”

Section: Physical Calibrationsmentioning

confidence: 99%

Type Ia Supernovae as Extragalactic Distance Indicators

Branch

Nugent

Fisher

1997

Thermonuclear Supernovae

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Abstract. Because Type Ia supernovae (SNe Ia) are not perfect standard candles, it is important to be able to use distance-independent observables (DIOs) to define subsets of SNe Ia that are "nearly standard candles" or to correct SN Ia absolute magnitudes to make them nearly homogeneous ("standardized candles"). This is not crucial for the measurement of H 0 , but it is for the measurement of q 0 and of parent-galaxy peculiar velocities. We discuss the use of various photometric and spectroscopic SN Ia DIOs, and a parent-galaxy DIO, for this purpose. We also discuss the status of the absolute-magnitude calibration of SNe Ia. We find that SNe Ia, whether calibrated by means of (1) Cepheids in their parent galaxies, (2) fitting their optical-ultraviolet spectra with detailed non-LTE model atmosphere calculations, or (3) by considering that the light curve is powered by the decay of radioactive 56 Ni, firmly indicate that the value of H 0 is low, less than or about 60 km s −1 Mpc −1 . Some issues regarding the determination of q 0 by means of SNe Ia are discussed briefly. Finally, we conjecture that even if q 0 =0.5, there probably is no cosmic age problem.

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Section: Physical Calibrationsmentioning

confidence: 99%

Type Ia Supernovae as Extragalactic Distance Indicators

Branch

Nugent

Fisher

1997

Thermonuclear Supernovae

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“…There have been several modern SN surveys that have focused on the galaxy cluster environment, beginning with that of Norgaard-Nielsen et al (1989). The first systematic survey, the Mount Stromlo Abell Cluster Supernova Search (Reiss et al 1998), ran for 3.5 yr and discovered 52 SNe, 25 of which were associated with the cluster targets.…”

Section: Introductionmentioning

confidence: 99%

A Photometric Search for Transients in Galaxy Clusters

Sand¹,

Zaritsky

Herbert-Fort

et al. 2008

The Astronomical Journal

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We have begun a program to search for supernovae and other transients in the fields of galaxy clusters with the 2.3 m Bok Telescope on Kitt Peak. We present our automated photometric methods for data reduction, efficiency characterization, and initial spectroscopy. With this program, we aim to ultimately identify ∼25-35 cluster Type Ia supernovae (SNe Ia) (∼10 of which will be intracluster, hostless events) and constrain the SN Ia rate associated with old, passive stellar populations. With these measurements we will constrain the relative contribution of hostless and hosted SNe Ia to the metal enrichment of the intracluster medium. In the current work, we have identified a central excess of transient events within 1.25r 200 in our cluster fields after statistically subtracting out the "background" transient rate taken from an off-cluster CCD chip. Based on the published rate of SNe Ia for cluster populations we estimate that ∼20% of the excess cluster transients are due to cluster SNe Ia, a comparable fraction to core collapse (CC) supernovae and the remaining are likely to be active galactic nuclei. Interestingly, we have identified three intracluster SN candidates, all of which lay beyond R > r 200 . These events, if truly associated with the cluster, indicate a large deficit of intracluster (IC) SNe at smaller radii, and may be associated with the IC stars of infalling groups or indicate that the intracluster light (ICL) in the cluster outskirts is actively forming stars which contribute CC SNe or prompt SNe Ia.

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“…High-redshift supernova searches have been proceeding since the late 1980's (Norgaard-Nielsen et al 1989;Couch et al 1989;Perlmutter et al 1995Perlmutter et al , 1997Perlmutter et al , 1998Perlmutter et al , 1999Schmidt et al 1998;Riess et al 1998;Tonry et al 2003;Knop et al 2003;Riess et al 2004). Particularly since the discovery of the accelerating expansion of the Universe, the high-redshift supernova methodology for measuring cosmological parameters has been critically scrutinized for sources of systematic uncertainty.…”

Section: Sources Of Systematic Uncertaintymentioning

confidence: 99%