J/ApJ/730/119 HST/WFC3 observations of Cepheids in SN Ia hosts (Riess+, 2011)
A 3% solution: determination of the Hubble constant with the Hubble Space
Telescope and Wide Field Camera 3.
Riess A.G., Macri L., Casertano S., Lampeitl H., Ferguson H.C.,
Filippenko A.V., Jha S.W., Li W., Chornock R., Silverman J.M.
<Astrophys. J., 730, 119 (2011)>
=2011ApJ...730..119R 2011ApJ...730..119R
ADC_Keywords: Photometry, HST ; Stars, variable ; Galaxies, photometry ;
Infrared sources
Keywords: cosmological parameters - dark energy - distance scale -
galaxies: distances and redshifts - stars: variables: Cepheids -
supernovae: general
Abstract:
We use the Wide Field Camera 3 (WFC3) on the Hubble Space Telescope
(HST) to determine the Hubble constant from optical and infrared
observations of over 600 Cepheid variables in the host galaxies of
eight recent Type Ia supernovae (SNe Ia), providing the calibration
for a magnitude-redshift relation based on 253 SNe Ia.
Description:
The SH0ES ("Supernovae and H0 for the Equation of State")
program was developed to improve upon the calibration of the
luminosity of SNe Ia in order to better measure the Hubble constant.
The data employed to observe Cepheids in eight SN Ia hosts and NGC
4258 have been collected over 15 years with four cameras over ∼500
orbits of HST Cycles 16 and 17.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 90 647 WFC3-IR observations of Cepheids
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See also:
J/ApJ/715/277 : Insights into the Cepheid distance scale (Bono+, 2010)
J/ApJS/183/109 : Cepheids in 3 host galaxies (Riess+, 2009)
J/ApJ/699/539 : Cepheids in SN-Ia host galaxies (Riess+, 2009)
J/ApJ/652/1133 : BVI photometry of NGC 4258 Cepheids (Macri+, 2006)
J/A+A/411/361 : VI photometry of extra-galactic Cepheids (Kanbur+, 2003)
J/ApJ/529/723 : VI photometry of Cepheids (Gibson+, 2000)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 5 A5 --- Field Cepheid's host field (nNNNN)
7- 14 F8.4 deg RAdeg Right Ascension in decimal degrees (J2000)
16- 24 F9.5 deg DEdeg Declination in decimal degrees (J2000)
26- 32 I7 --- ID ? Object identification (1)
34- 40 F7.3 d Period [3.072/203.3] Period
42- 45 F4.2 mag V-I [0.38/1.92] Mean (V-I) color index
47- 51 F5.2 mag F160W [19.94/27.02] HST/WFC3 F160W band magnitude
53- 57 F5.2 mag e_F160W ?=99 Uncertainty in F160W
59- 62 F4.2 pix Offset [0/9.81] Flux centroid displacement (2)
64- 68 F5.2 mag Bias [-0.1/1.48] Photometric crowding bias (3)
70- 75 F6.2 --- IMrms Root-mean square of the residual image (4)
77- 80 F4.2 [-] [O/H] [8.26/9.25] Metallicity parameter (5)
82- 90 A9 --- Flag Rejection flag for P-L relations (low P, rej)
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Note (1): From Macri et al. (2006, Cat. J/ApJ/652/1133;
<[MSB2006] O-NNNNN> or <[MSB2006] I-NNNNNN> in Simbad),
Riess et al. (2009, Cat. J/ApJS/183/109; <[RML2009] NGC 3370 NNNNN>
and <[RML2009] NGC 1309 NNNNN> in Simbad), Riess et al. 2009,
Cat. J/ApJ/699/539, for NGC 42558 (<[RMC2009] NIC-POSNN NNNNNN> in
Simbad and other formats) and Macri et al. (2011a,b,c in prep).
Note (2): In the near-IR data relative to the optical Cepheid position,
expressed in units of pixels (1 pixel =0.08"), used to refine the
determination of the crowding bias.
Note (3): Determined using the artificial-star tests for each Cepheid's
environment (see Section 2.3 of Riess et al. (2009,
Cat. J/ApJS/183/109) and the displacement tabulated in the previous
column; this correction has already been applied to the F160Wmag
magnitudes.
Note (4): Weighted by the inverse distance from the Cepheid position, useful
for determining the quality of the crowded-scene fit.
Note (5): 12+log[O/H] (Zaritsky et al. 1994ApJ...420...87Z 1994ApJ...420...87Z) derived from the
deprojected galactocentric radii of each Cepheid and the abundance
gradient of its host.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 10-Oct-2012