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Supernova host galaxy properties at intermediate redshift - the Stockholm VIMOS Supernova Survey V
Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC). Stockholm University, Faculty of Science, Department of Astronomy.
CNRS; Universite de Toulouse.
Stockholm University, Faculty of Science, Department of Astronomy. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
Space Telescope Science Institute.
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(English)Manuscript (preprint) (Other academic)
Abstract [en]

Context. The Stockholm VIMOS Supernova Survey (SVISS) is an optical broad-band photometry survey, aimed at the search fordistant (z0.7) supernovae (SNe), which are detected by means of monthly imaging in R and I bands with the VIMOS instrument onthe ESO VLT. The distances to the SNe are estimated using photometric redshifts facilitated by additional U, B and V imaging alsowith VIMOS.

Aims. We investigate the properties of host galaxies for two SN types, thermonuclear and core collapse, by comparing both samples.We summarize the steps necessary to produce a SN catalogue (from detection, to photometry and typing) and explain the processfollowed to identify the host galaxies and determine their properties.

Methods. Using a spectral energy distribution (SED) fitting 2 minimization code we compute spectral energy distribution, age, starformation rate (SFR), absolute magnitudes for the host galaxies of the SN sample. Such galaxies are chosen based on their photometricredshift (GOODZ) and SED (modified version of Hyperz). From comparisons of the different photometric parameters’ distributionsbetween CC and TN SN host galaxies, we derived different trends.

Results. We find that CC SNe tend to be more centrally concentrated than TN SNe, with the former being present in late-type/starforminggalaxies and the latter in all galaxy types. CC SNe seem to favor brighter galaxies than TN SNe. KS tests on the stellarmass-extinction distribution show that TN and CC are drawn from the normal galaxy population, and on the SFR-extinction indicatesthat TN SN host galaxies are culled from it as well, but CC SN host galaxies are not derived from it.

Keyword [en]
supernova, host galaxies
National Category
Natural Sciences
Research subject
URN: urn:nbn:se:su:diva-62289OAI: diva2:440843
Available from: 2011-09-13 Created: 2011-09-13 Last updated: 2011-09-15Bibliographically approved
In thesis
1. Distant supernovae and galaxies in the Stockholm VIMOS Supernova Survey
Open this publication in new window or tab >>Distant supernovae and galaxies in the Stockholm VIMOS Supernova Survey
2011 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Multi colour imaging surveys help astronomers to find galaxies and clusters,and to gain insights on their physical properties and evolution.

In this thesis, I present the Stockholm VIMOS Supernova Survey (SVISS), where the ELAIS-S field was observed with VIMOS UBVRI broad-band optical bands over a period of 5 years. The main goal of SVISS is to determine supernova rates at redshifts from z~0.1-1, but the wealth of data enable us to study also galaxy evolution and the supernovae hosts galaxies. I describe the work done to create a deep photometric catalogue of galaxies in the field,including computations of survey completeness and galaxy number counts. In addition I describehow we use colour criteria to select high redshift galaxy candidates (so called Lyman Break Galaxies).Photometric redshifts have been obtained for most galaxies in the field using a template-fitting method. I briefly describe this method and present the resulting redshift distribution.

We have found 16 supernovae in total, 7 thermonuclear supernovae and 9 core collapse, using the difference imaging technique.From their broad band flux and colour evolution of the supernovae, we classified them into core collapse and thermonuclear supernovae, with an internal accuracy of 95%. We compute supernova rates for both types up to redshift of 1, and we show a good agreement with the other determined rates.

We have done studies on the relation between supernovae and host galaxies to try understand the nature of supernovae and their environments.The position of the supernovae within the galaxies, their star formation rate, host galaxy luminosity, among others, have been derived and tested against published results showing a good agreement with results at lower redshifts.

Place, publisher, year, edition, pages
Stockholm: Department of Astronomy, Stockholm University, 2011. 80 p.
imaging surveys, photometric redshfits, Lyman Break galaxies, supernova typing, supernova rates, supernova host galaxies
National Category
Astronomy, Astrophysics and Cosmology
Research subject
urn:nbn:se:su:diva-62118 (URN)978-91-7447-362-9 (ISBN)
Public defence
2011-10-10, sal FA32, AlbaNova universitetscentrum, Roslagstullsbacken 21, Stockholm, 13:00 (English)
At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 1: Submitted. Paper 2: Submitted. Paper 3: Manuscript. Paper 4: Manuscript.Available from: 2011-09-18 Created: 2011-09-09 Last updated: 2011-09-15Bibliographically approved

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Mencia Trinchant, LaiaMelinder, JensFransson, Claes
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