J/A+A/544/A81 Supernovae and their hosts in the SDSS DR8 (Hakobyan+, 2012)
Supernovae and their host galaxies. I. The SDSS DR8 database and statistics.
Hakobyan A.A., Adibekyan V.Zh., Aramyan L.S., Petrosian A.R., Gomes J.M.,
Mamon G.A., Kunth D., Turatto M.
<Astron. Astrophys. 544, A81 (2012)>
=2012A&A...544A..81H 2012A&A...544A..81H
ADC_Keywords: Supernovae ; Galaxies, optical ; Galaxies, photometry ;
Galaxy catalogs ; Morphology ; Positional data ; Surveys
Keywords: astronomical databases: miscellaneous - supernovae: general -
galaxies: general - galaxies: fundamental parameters -
galaxies: structure
Abstract:
We report the creation of large and well-defined database that
combines extensive new measurements and a literature search of 3876
supernovae (SNe) and their 3679 host galaxies located in the sky area
covered by the Sloan Digital Sky Survey (SDSS) Data Release 8 (DR8).
This database should be much larger than previous ones, and should
contain a homogenous set of global parameters of SN hosts, including
morphological classifications and measures of nuclear activity.
Identification of the host galaxy sample is 91% complete (with 3536
SNe in 3340 hosts), of which the SDSS names of ∼1100 anonymous hosts
are listed for the first time. The morphological classification is
available for 2104 host galaxies, including 73 (56) hosts in
interacting (merging) systems. The total sample of host galaxies
collects heliocentric redshifts for 3317 (∼90%) galaxies. The g-band
magnitudes, D25, b/a, and PA are available for 2030 hosts of the
morphologically classified sample of galaxies. Nuclear activity
measures are provided for 1189 host galaxies. We analyze and discuss
many selection effects and biases that can significantly affect any
future analysis of our sample. The creation of this large database
will help to better understand how the different types of SNe are
correlated with the properties of the nuclei and global physical
parameters of the host galaxies, and minimize possible selection
effects and errors that often arise when data are selected from
different sources and catalogues.
Description:
The measurements of apparent magnitudes, diameters (D25), axial
ratios (b/a), and position angles (PA) of SN host galaxies were made
using the images extracted from the SDSS g-band. For each host galaxy,
we analyzed RGB images of the SDSS to accurately measure the position
of its nucleus to provide the SDSS name. With these images, we also
provide the host galaxy's morphological type, and note if it has a
bar, a disturbed disk, and whether it is part of an interacting or
merging system. In addition, the SDSS nuclear spectra were analyzed to
diagnose the central power source of the galaxies. Special attention
was paid to collect accurate data on the spectroscopic classes,
coordinates, offsets of SNe, and heliocentric redshifts of the host
galaxies.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
snsdss.dat 187 3876 Physical parameters of SNe and their host galaxies
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See also:
B/sn : Asiago Supernova Catalogue (Barbon et al., 1999-)
J/ApJ/708/661 : SDSS-II SN Survey: SNe II-P standardization (D'Andrea+, 2010)
J/ApJ/713/1026 : SN Ia rate at redshift ≲0.3 from SDSS-II (Dilday+, 2010)
J/ApJS/185/32 : First-year SDSS-II SN results (Kessler+, 2009)
http://www.sdss.org : SDSS Home Page
Byte-by-byte Description of file: snsdss.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- SN Supernova (SN) designation
8 A1 --- u_SN [?] "?" denote an unconfirmed SN
10- 18 F9.5 deg RAdeg ? SN right ascension in degrees (J2000.0)
20- 28 F9.5 deg DEdeg ? SN declination in degrees (J2000.0)
30 A1 --- u_DEdeg Uncertainty flag on SN position
32- 37 F6.2 arcsec oRA ? SN offset right ascension from host galaxy
nucleus, in the E/W direction
39 A1 --- n_oRA [E/W] E/W direction of SN offset oRA
41- 47 F7.2 arcsec oDE ? SN offset declination from host galaxy
nucleus in arcsec, in the N/S direction
49 A1 --- n_oDE [N/S] N/S direction of SN offset oDE
51 A1 --- u_oDE SN offset uncertainty flag
54- 64 A11 --- Type ? SN type (mostly from spectroscopy)
66 A1 --- u_Type [*:?] Uncertainty flag on SN type (1)
68 A1 --- f_Type [U] U for updated SN type
71- 89 A19 --- Gal SN host galaxy identification (2)
94 A1 --- u_Gal SN host galaxy uncertainty (3)
97-105 F9.5 deg RAg.deg ? Host galaxy right ascension (J2000.0)
107-115 F9.5 deg DEg.deg ? Host galaxy declination (J2000.0)
117-124 F8.5 --- z ? Host galaxy redshift (4)
126-135 A10 --- MType ? Host galaxy morphological type
136 A1 --- u_MType [:?] Uncertainty flag on morphology (5)
138 A1 --- Bar [B] Presence of bar in the host galaxy
141-145 A5 --- int [inter/merg ] Host in interacting or in merging
147 A1 --- dd [D] Host with disturbed disk structure
151-155 F5.1 arcsec Diam ? Host galaxy isophotal diameter (6)
157-161 F5.3 --- b/a ? Host galaxy axial ratio
163-167 F5.1 deg PA ? Host galaxy position angle
169-173 F5.2 mag gmag ? Host galaxy g-band magnitude
175-179 A5 --- BPT Host galaxy activity class in BPT (7)
182-187 A6 --- WHAN Host galaxy activity class in WHAN (8)
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Note (1): In a few cases, marked by "*", SN types have been inferred from
the light curve. Uncertainties in SN type are marked by ":"
and "?" (highly uncertain).
Note (2): Host galaxy SDSS identification. An alternative name is mentioned
when SDSS identification was not possible to obtain.
Unidentified (anonymous) galaxies are listed with the letter A.
Note (3): In a few cases, where the association with
a definite host galaxy was not possible (multiple galaxy
systems, etc.), we have added ":" symbol.
Note (4): Heliocentric redshift of host galaxy from different sources
(mostly from the SN catalogues and SDSS spectra).
Note (5): Uncertainties in host galaxy morphological type are marked by ":"
and "?" (highly uncertain).
Note (6): Measured major axis in arcsec (isophotal level of 25mag/arcsec2
in the SDSS g-band) of the host galaxy.
Note (7): The activity of host in the BPT diagram, which includes narrow-line
AGN (Seyfert (Sy) or LINER), SF (star-forming), and composite (C) galaxies.
Note (8): The activity of host in the WHAN diagram, which includes narrow-line
AGN (Seyfert (Sy) or LINER), SF (star-forming), and retired/passive (RP)
galaxies. The WHAN column includes also broad-line AGN (BL AGN), and
passive (P) galaxies.
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Acknowledgements:
Artur Hakobyan, hakobyan(at)bao.sci.am
(End) Artur Hakobyan [BAO], Patricia Vannier [CDS] 27-Jun-2012