C.D.S. - SIMBAD4 rel 1.7 - 2020.07.08CEST03:04:58

2014A&A...563A.140F - Astronomy and Astrophysics, volume 563A, 140-140 (2014/3-1)

Spectroscopic identification of a redshift 1.55 supernova host galaxy from the Subaru Deep Field Supernova Survey.


Abstract (from CDS):

The Subaru Deep Field (SDF) Supernova Survey discovered ten Type Ia supernovae (SNe Ia) in the redshift range 1.5<z<2.0, determined solely from photometric redshifts of the host galaxies. However, photometric redshifts might be biased, and the SN sample could be contaminated by active galactic nuclei (AGNs). We aim to obtain the first robust redshift measurement and classification of a z>1.5 SDF SN Ia host galaxy candidate. We use the X-shooter (U-to-K-band) spectrograph on the Very Large Telescope to allow the detection of different emission lines in a wide spectral range. We measure a spectroscopic redshift of 1.54563±0.00027 of hSDF0705.25, consistent with its photometric redshift of 1.552±0.018. From the strong emission-line spectrum we rule out AGN activity, thereby confirming the optical transient as a SN. The host galaxy follows the fundamental metallicity relation showing that the properties of this high-redshift SN Ia host galaxy is similar to other field galaxies. Spectroscopic confirmation of additional SDF SN hosts would be required to confirm the cosmic SN rate evolution measured in the SDF.

Abstract Copyright:

Journal keyword(s): Galaxy: abundances - galaxies: distances and redshifts - galaxies: high-redshift

Simbad objects: 4

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Number of rows : 4

N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
1 CD-32 5613 WD* 08 41 32.4293043356 -32 56 32.916852010   12.07 11.85 12.3   DA5.5 264 0
2 NAME Subaru Deep Field NGP reg 13 24 21.3 +27 29 23           ~ 303 1
3 [GPM2011] SNSDF 0705.25 SN* 13 25 30.610 +27 12 59.39           Ia 2 0
4 [GPM2011] hSDF 0705.25 G 13 25 30.640 +27 12 59.84   24.49 24.46 24.17   ~ 2 0

    Equat.    Gal    SGal    Ecl

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