J/AJ/137/3731 ESSENCE high-redshift supernova (Foley+, 2009)
Spectroscopy of high-redshift supernovae from the ESSENCE project:
the first four years.
Foley R.J., Matheson T., Blondin S., Chornock R., Silverman J.M.,
Challis P., Clocchiatti A., Filippenko A.V., Kirshner R.P., Leibundgut B.,
Sollerman J., Spyromilio J., Tonry J.L., Davis T.M., Garnavich P.M.,
Jha S.W., Krisciunas K., Li W., Pignata G., Rest A., Riess A.G.,
Schmidt B.P., Smith R.C., Stubbs C.W., Tucker B.E., Wood-Vasey W.M.
<Astron. J., 137, 3731-3742 (2009)>
=2009AJ....137.3731F 2009AJ....137.3731F
ADC_Keywords: Supernovae ; Redshifts
Keywords: distance scale - galaxies: distances and redshifts -
supernovae: general
Abstract:
We present the results of spectroscopic observations from the ESSENCE
high-redshift supernova (SN) survey during its first four years of
operation. This sample includes spectra of all SNe Ia whose light
curves were presented by Miknaitis et al. (2007, Cat. J/ApJ/666/674)
and used in the cosmological analyses of Davis et al.
(2007ApJ...666..716D 2007ApJ...666..716D) and Wood-Vasey et al. (2007ApJ...666..694W 2007ApJ...666..694W).
The sample represents 273hr of spectroscopic observations with 6.5-10m
class telescopes of objects detected and selected for spectroscopy by
the ESSENCE team. We present 184 spectra of 156 objects. Combining
this sample with that of Matheson et al. (2008, Cat. J/AJ/135/1598),
we have a total sample of 329 spectra of 274 objects. From this, we
are able to spectroscopically classify 118 Type Ia SNe.
Description:
Spectroscopic observations of ESSENCE targets were obtained at a wide
variety of telescopes: the Keck I and II 10m telescopes, the European
Southern Observatory 8.2m Very Large Telescope (ESO VLT), the Gemini
North and South 8m telescopes, the Magellan Baade and Clay 6.5m
telescopes, and the MMT 6.5m telescope. The spectrographs used were
LRIS with Keck I, DEIMOS with Keck II, FORS1 with the VLT, GMOS with
Gemini (North and South), IMACS with Baade, LDSS2 and LDSS322 with
Clay, and the Blue Channel with MMT. Nod-and-shuffle techniques were
used with GMOS (North and South) and some IMACS observations to
improve sky subtraction in the red portion of the spectrum. A single
spectrum was obtained with the FAST spectrograph mounted on the
Tillinghast 1.5m telescope at the F.L. Whipple Observatory.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 136 330 ESSENCE spectroscopic targets
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See also:
http://www.ctio.noao.edu/essence/ : ESSENCE page
J/ApJ/666/674 : ESSENCE supernova survey (Miknaitis+, 2007)
J/AJ/135/1598 : Optical spectroscopy of type Ia supernovae (Matheson+, 2008)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- ID ESSENCE internal identification (1)
5- 18 A14 --- n_ID ESSENCE internal identification (1)
20- 25 A6 --- IAUC IAUC identification, YYYYaa (2)
27- 30 I4 yr Obs.Y ? UT Year of the observation
32- 33 I2 month Obs.M ? UT Month of the observation
35- 40 F6.3 d Obs.D ? UT Day of the observation
42- 51 A10 --- Tel Telescope used ("Description" section above)
53- 56 A4 --- Type Best guess at object classification (3)
58- 61 A4 --- SType Best guess at object subtype
63- 67 F5.3 --- zGal ? Host galaxy redshift (4)
69- 73 F5.3 --- zSN ? Supernova redshift from SNID template fit
(Blondin & Tonry 2007ApJ...666.1024B 2007ApJ...666.1024B)
75- 79 F5.3 --- e_zSN ? Uncertainty in z-SNID
81- 86 A6 --- Templ Template supernova used
88- 92 F5.1 d phSN ? SNID template derived phase
94- 97 F4.1 d e_phSN ? Uncertainty in Ph-SNID
99-103 F5.1 d phLC ? Light curve rest-frame derived phase
105-107 F3.1 d e_phLC ? Uncertainty in Ph-LC
109-114 F6.3 --- Delta ? Supernova Δ value (5)
116 A1 --- l_mag Limit flag on mag
118-121 F4.1 mag mag ? Magnitude at discovery
123-136 A14 s ExpTime Exposure times
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Note (1): The first letter indicates the month in the observing season.
This is followed by a sequential number as targets are discovered.
The remaining letters and numbers (in n_ID) show the specific
ESSENCE field where the object was located.
Note (2): Note that not all objects judged to be SNe have official
International Astronomical Union names.
Note (3): Classification as follows:
AGN = AGN
Gal = Galaxy
II = SN II
II? = indicates a lack of certainty in the identification as a SN II
IA = SN Ia
Ia? = indicates a lack of certainty in the identification as a SN Ia
Ib = SN Ib
Ib/c = SN Ib/c
Ic = SN Ic
Star = star
Unk = unknown
N.S. = indicates that the telescope was pointed to the object, but
no exposure was taken or the exposure contained no signal
Note (4): Measured from narrow emission or absorption lines from the host
galaxy. All galactic redshift errors are <0.001.
Note (5): where the absolute magnitude is
Mv(t=0)=-19.504mag+0.736Δ+0.182Δ2+log(H0/65)
(Jha et al., 2007ApJ...659..122J 2007ApJ...659..122J, Cat. J/ApJ/659/122).
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 10-Sep-2011