J/ApJ/895/32 Zwicky Transient Facility BTS. I. (Fremling+, 2020)
The Zwicky Transient Facility Bright Transient Survey.
I. Spectroscopic classification and the redshift completeness of local galaxy
catalogs.
Fremling C., Miller A.A., Sharma Y., Dugas A., Perley D.A., Taggart K.,
Sollerman J., Goobar A., Graham M.L., Neill J.D., Nordin J., Rigault M.,
Walters R., Andreoni I., Bagdasaryan A., Belicki J., Cannella C.,
Bellm E.C., Cenko S.B., De K., Dekany R., Frederick S., Golkhou V.Z.,
Graham M.J., Helou G., Ho A.Y.Q., Kasliwal M.M., Kupfer T., Laher R.R.,
Mahabal A., Masci F.J., Riddle R., Rusholme B., Schulze S., Shupe D.L.,
Smith R.M., Van Velzen S., Yan L., Yao Y., Zhuang Z., Kulkarni S.R.
<Astrophys. J., 895, 32-32 (2020)>
=2020ApJ...895...32F 2020ApJ...895...32F (SIMBAD/NED BibCode)
ADC_Keywords: Supernovae; Galaxies; Photometry, ugriz; Redshifts
Keywords: Supernovae; Galaxies; Redshift surveys; Surveys
Abstract:
The Zwicky Transient Facility (ZTF) is performing a three-day cadence
survey of the visible northern sky (∼3π) with newly found transient
candidates announced via public alerts. The ZTF Bright Transient
Survey (BTS) is a large spectroscopic campaign to complement the
photometric survey. BTS endeavors to spectroscopically classify all
extragalactic transients with mpeak≲18.5mag in either the gZTF or
rZTF filters, and publicly announce said classifications. BTS
discoveries are predominantly supernovae (SNe), making this the
largest flux-limited SN survey to date. Here we present a catalog of
761 SNe, classified during the first nine months of ZTF (2018 April
1-2018 December 31). We report BTS SN redshifts from SN template
matching and spectroscopic host-galaxy redshifts when available. We
analyze the redshift completeness of local galaxy catalogs, the
redshift completeness fraction (RCF; the ratio of SN host galaxies
with known spectroscopic redshift prior to SN discovery to the total
number of SN hosts). Of the 512 host galaxies with SNe Ia, 227 had
previously known spectroscopic redshifts, yielding an RCF estimate of
44%±4%. The RCF decreases with increasing distance and decreasing
galaxy luminosity (for z<0.05, or ∼200Mpc, RCF∼0.6). Prospects for
dramatically increasing the RCF are limited to new multifiber
spectroscopic instruments or wide-field narrowband surveys. Existing
galaxy redshift catalogs are only ∼50% complete at r∼16.9mag. Pushing
this limit several magnitudes deeper will pay huge dividends when
searching for electromagnetic counterparts to gravitational wave
events or sources of ultra-high-energy cosmic rays or neutrinos.
Description:
With the Zwicky Transient Facility (ZTF) in combination with the fully
automated Spectral Energy Distribution Machine (SEDM), a
low-resolution (R∼100), integral-field-unit (IFU) spectrograph mounted
on the robotic Palomar 60inch telescope (P60), we have set out to
address the lack of spectroscopic completeness. We aim to monitor the
entire visible sky at moderate cadence while being complete in terms
of spectroscopic classification.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 148 764 ZTF Bright Transient Survey (BTS) SNe
table3.dat 127 764 BTS Host Galaxies
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See also:
II/349 : The Pan-STARRS release 1 (PS1) Survey - DR1 (Chambers+, 2016)
J/ApJ/853/62 : Optical and NIR spectra and LCs of SN2016ija (Tartaglia+, 2018)
J/ApJ/886/152 : ZTF early observations of Type Ia SNe. I. LCs (Yao+, 2019)
http://italiansupernovae.org/ : Italian Supernovae Search Project
http://www.posssupernova.com/ : Puckett Observatory main page
http://nesssi.cacr.caltech.edu/SNhunt/ : The Great Supernova Hunt
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 12 A12 --- ZTF ZTF Name
14- 15 I2 h RAh [0/24] Hour of Right Ascension, SNe (J2000)
17- 18 I2 min RAm Minute of Right Ascension, SNe (J2000)
20- 24 F5.2 s RAs Second of Right Ascension, SNe (J2000)
26- 26 A1 --- DE- [±] Sign of the Declination, SNe (J2000)
27- 28 I2 deg DEd Degree of Declination, SNe (J2000)
30- 31 I2 arcmin DEm Arcminute of Declination, SNe (J2000)
33- 36 F4.1 arcsec DEs Arcsecond of Declination, SNe (J2000)
38- 46 A9 --- IAU IAU Name
48- 76 A29 --- TNS Transient Name Server Internal Name
78- 90 A13 --- Survey Discovered by, survey/reference (1)
92- 96 F5.3 mag B-V [0.005/0.67] Reddening (2)
98-106 A9 --- SNtype Sueprnova Type
108-112 F5.3 --- z [0.001/0.28] Supernova Redshift (3)
114-119 F6.2 d JDg [210/715]? Observed time, maximum brightness,
g-band, JD-2458000 (4)
121-125 F5.2 mag gmag [13.9/20.6]? g-ZTF band magnitude, maximum
brightness (4)
127-130 F4.2 mag e_gmag [0.01/0.3]? Uncertainty in gmag (4)
132-137 F6.2 d JDr [214/706]? Observed time, maximum brightness,
r-band, JD-2458000 (4)
139-143 F5.2 mag rmag [13.9/20.2]? r-ZTF band magnitude, maximum
brightness (4)
145-148 F4.2 mag e_rmag [0.01/0.3]? Uncertainty, rmag (4)
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Note (1): References as follows:
ASAS-SN = Shappee+, 2014AAS...22323603S 2014AAS...22323603S
ATLAS = Tonry+, 2018PASP..130f4505T 2018PASP..130f4505T
CSNS = Corona Borealis Observatory Supernova Survey
Sun+, 2018TNSTR2007....1S 2018TNSTR2007....1S
G. Cortini = Cortini, 2018TNSTR.393....1C 2018TNSTR.393....1C
DLT40 = Tartaglia+, 2018, J/ApJ/853/62
Gaia = Hodgkin+, 2013RSPTA.37120239H 2013RSPTA.37120239H
K. Itagaki = Itagaki, 2018TNSTR1614....1I 2018TNSTR1614....1I, and 2018TNSTR1766....1I 2018TNSTR1766....1I
ISSP = Italian Supernovae Search Project; http://italiansupernovae.org/
LOSS = Filippenko+, 2001ASPC..246..121F 2001ASPC..246..121F
MASTER = Mobile Astronomical System of TElescope Robots,
Gorbovskoy+, 2013ARep...57..233G 2013ARep...57..233G
POSS = Puckett Observatory Supernova Search, http://www.posssupernova.com/
PS1 = Chambers+, 2016, II/349
J. Grzegorzek = Grzegorzek, 2018TNSTR.582....1G 2018TNSTR.582....1G
PTSS = MO-Tsinghua Supernova Survey, http://www.cneost.org/ptss/
SNhunt = Great Supernova Hunt, http://nesssi.cacr.caltech.edu/SNhunt/
TNTS = Tsinghua University-National Astronomical Observatories,
Chinese Academy of Sciences Transient Survey,
Zhang+, 2015RAA....15..215Z 2015RAA....15..215Z
XOSS = Xinming Observatory Supernova Survey,
Zhang+, 2018TNSTR1393....1Z 2018TNSTR1393....1Z
Y. Tanaka = Tanaka, 2018TNSTR.469....1T 2018TNSTR.469....1T
ZTF = Zwicky Transient Facility
Note (2): E(B-V) is determined using the
Schlafly & Finkbeiner, 2011ApJ...737..103S 2011ApJ...737..103S updates to the
Schlegel+, 1998ApJ...500..525S 1998ApJ...500..525S maps.
Note (3): Redshift determined from SNID (see text). No corrections for
Heliocentric, Galactocentric, or host-galaxy-rotation velocity are
applied to z.
Note (4): Time and magnitude of maximum brightness are determined directly
from the observations, as available in the AVRO alert packets. Null
values are given (as blanks) when the SN was not detected in either the
g-ZTF or r-ZTF filter. No correction for extinction has been applied.
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 12 A12 --- ZTF ZTF Name
14- 34 A21 --- Host Host Name
36- 37 I2 h RAh [0/24]? Hour of Right Ascension (J2000)
39- 40 I2 min RAm ? Minute of Right Ascension (J2000)
42- 46 F5.2 s RAs ? Second of Right Ascension (J2000)
48- 48 A1 --- DE- [±] Sign of the Declination (J2000)
49- 50 I2 deg DEd ? Degree of Declination (J2000)
52- 53 I2 arcmin DEm ? Arcminute of Declination (J2000)
55- 58 F4.1 arcsec DEs ? Arcsecond of Declination (J2000)
60- 66 F7.5 --- z [0.002/0.15]? Redshift, host
68- 73 F6.2 arcsec SNoffset [0.01/103]? SN offset from host
75- 79 F5.2 kpc Dist [0.01/35.4]? Distance
81- 85 F5.2 mag gmag [9.84/23.1]? PS1 Kron g band AB magnitude (1)
87- 91 F5.2 mag rmag [9.37/22.8]? PS1 Kron r band AB magnitude (1)
93- 97 F5.2 mag imag [8.91/22.7]? PS1 Kron i band AB magnitude (1)
99-103 F5.2 mag zmag [8.74/21.5]? PS1 Kron z band AB magnitude (1)
105-109 F5.2 mag ymag [9.82/20.7]? PS1 Kron y band AB magnitude (1)
111-115 F5.2 mag W1mag [7.67/21.4]? Tractor derived WISE band 1 AB
magnitude (1)
117-121 F5.2 mag W2mag [7.54/21.1]? Tractor derived WISE band 2 AB
magnitude (1)
123-127 F5.3 mag B-V [0.006/0.66]? Reddening, E(B-V) (2)
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Note (1): Optical grizy photometry is taken from PS1 Kron magnitude
measurements, while mid-IR W1 and W2 photometry are from Tractor and
WISE (see text). All magnitudes are reported in the AB system, and no
correction for extinction has been applied. The host galaxies for
ZTF18acbzoyh (SN 2018hqu) and ZTF18acdwohd (SN 2018ids) are not detected
in the PS1 catalog.
Note (2): E(B-V) is determined using the
Schlafly & Finkbeiner, 2011ApJ...737..103S 2011ApJ...737..103S updates to the
Schlegel+, 1998ApJ...500..525S 1998ApJ...500..525S maps.
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History:
From electronic version of the journal
References:
Perley et al. Paper II: 2020ApJ...904...35P 2020ApJ...904...35P
(End) Prepared by [AAS], Coralie Fix [CDS], 17-Sep-2021