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J/ApJ/699/539      Cepheids in SN-Ia host galaxies                (Riess+, 2009)

A redetermination of the Hubble constant with the Hubble space telescope from a differential distance ladder. Riess A.G., Macri L., Casertano S., Sosey M., Lampeitl H., Ferguson H.C., Filippenko A.V., Jha S.W., Li W., Chornock R., Sarkar D. <Astrophys. J., 699, 539-563 (2009)> =2009ApJ...699..539R
ADC_Keywords: Stars, variable ; Photometry, HST ; Supernovae Keywords: cosmology: observations - distance scale - galaxies: distances and redshifts - supernovae: general Abstract: This is the second of two papers reporting results from a program to determine the Hubble constant to ∼5% precision from a refurbished distance ladder based on extensive use of differential measurements. Here we report observations of 240 Cepheid variables obtained with the Near-Infrared Camera and Multi-Object Spectrometer (NICMOS) Camera 2 through the F160W filter on the Hubble Space Telescope (HST). The Cepheids are distributed across six recent hosts of Type Ia supernovae (SNe Ia) and the "maser galaxy" NGC 4258, allowing us to directly calibrate the peak luminosities of the SNe Ia from the precise, geometric distance measurements provided by the masers. New features of our measurement include the use of the same instrument for all Cepheid measurements across the distance ladder and homogeneity of the Cepheid periods and metallicities, thus necessitating only a differential measurement of Cepheid fluxes and reducing the largest systematic uncertainties in the determination of the fiducial SN Ia luminosity. In addition, the NICMOS measurements reduce the effects of differential extinction in the host galaxies by a factor of ∼5 over past optical data. Combined with a greatly expanded set of 240 SNe Ia at z<0.1 which define their magnitude-redshift relation, we find H0=74.2±3.6km/s/Mpc, a 4.8% uncertainty including both statistical and systematic errors. Description: The goal of the Supernovae and H0 for the Equation of State (SHOES) Program (HST Cycle 15, GO-10802) is to measure H0 to <5% precision by mitigating the dominant systematic errors. Here we reporting the results of infrared (IR) observations of Cepheids which are homogeneous in their periods, metallicities, and measurements in both the anchor (NGC 4258) and the SN hosts. In HST Cycle 15, the SHOES program obtained deep (10-35ks), near-IR observations of the Cepheids in six SN Ia hosts. In Cycle 15, we also obtained 2 ks NICMOS imaging of Cepheids in NGC 4258 to augment that obtained in Cycle 13 by GO 10399 (P.I. Greenhill). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table3.dat 67 61 NIC2 F160W Cepheid observations table4.dat 97 240 NICMOS Cepheids
See also: J/ApJS/183/109 : Cepheids in 3 host galaxies (Riess+, 2009) J/ApJ/652/1133 : BVI photometry of NGC 4258 Cepheids (Macri+, 2006) J/ApJ/627/579 : Photometry of variables in NGC 3370 (Riess+, 2005) J/ApJ/529/723 : VI photometry of Cepheids (Gibson+, 2000) Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 20 A20 --- Target Target designation (1) 21 A1 --- n_Target [a] Duplicated field (2) 23- 24 I2 h RAh Hour of right ascension (J2000) 26- 27 I2 min RAm Minute of right ascension (J2000) 29- 34 F6.3 s RAs Second of right ascension (J2000) 36 A1 --- DE- Sign of declination (J2000) 37- 38 I2 deg DEd Degree of declination (J2000) 40- 41 I2 arcmin DEm Arcminute of declination (J2000) 43- 48 F6.3 arcsec DEs Arcsecond of declination (J2000) 50- 56 F7.1 s ExpT Exposure time 58- 67 A10 --- Field Field designation as in table 4 (added by CDS)
Note (1): Cepheid hosts observed by SHOES (Supernovae and H0 for the Equation of State program) in optical (see Paper I, Riess et al. 2009, Cat. J/ApJS/183/109) and NIR: ------------------------------------------------------------------------ Host SN Ia Initial HST Reobservation, NIR, Cycle 15 Optical Cycle Cycle 15 (and 13 for NGC 4258) ------------------------------------------------------------------------ NGC 4536 SN 1981B WFPC2 4 WFPC2 NIC2 NGC 4639 SN 1990N WFPC2 5 ACS NIC2 NGC 3982 SN 1998aq WFPC2 8 ACS NIC2 NGC 3370 SN 1994ae ACS 11 ACS NIC2 NGC 3021 SN 1995al ACS 14 ACS NIC2 NGC 1309 SN 2002fk ACS 14 ACS NIC2 NGC 4258 ACS 12 ACS/WFPC2 NIC2 ------------------------------------------------------------------------ Note (2): a = Same region as NGC4639-BLUE with different orientation.
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 10 A10 --- Field Cepheid's NIC2 field designation 12- 21 F10.6 deg RAdeg Right ascension in decimal degrees (J2000) 23- 32 F10.6 deg DEdeg Declination in decimal degrees (J2000) 34- 39 I6 --- [RML2009] Identification number (1) 41- 47 F7.3 d Per Period 49- 52 F4.2 mag V-I Mean (V-I) color index 54- 58 F5.2 mag F160W HST/NICMOS NIR F160W band magnitude 60- 63 F4.2 mag e_F160W F160W uncertainty 65- 69 F5.2 pix Offset Separation between NICMOS and optical position (2) 71- 75 F5.2 mag Bias Photometric bias (3) 77- 81 F5.2 mag Phase Correction from the sampled phase to the mean (already substracted to determine F160W) 83- 86 F4.2 [---] [O/H] Metallicity parameter, 12+log[O/H] inferred at the position of each Cepheid 88- 93 A6 --- Flag [<P/rej, ] Rejection flag employed (4) 95- 97 A3 --- r_V-I [lm/psl] Source of the optical detection (5)
Note (1): From * Riess et al. 2009, Cat. J/ApJS/183/109, <[RML2009] NGC NNNN NNNNN> in Simbad) * Macri et al. 2006, Cat. J/ApJ/652/1133, <[MSB2006] {O/I}-NNNNNN> in Simbad. * Cepheids from this paper are <[RMC2009] {Field} NNNNN> in Simbad. Note (2): Displacement of the Cepheid in the NICMOS data from its optical position in pixels of 0.038" size. Note (3): Photometric bias determined from the artificial star tests for the Cepheid's environment and displacement and are already added to determine F160W magnitude. Note (4): Flag as follows: <P = the period is shorter than the optical completeness from Riess et al. 2009, Cat. J/ApJS/183/109. rej = σ clipped. Note (5): Source of optical Cepheid parameters as follows: lm = Riess et al. 2009, Cat. J/ApJS/183/109 and Macri et al. 2009, ApJ in prep psl = Stetson & Gibson 2001MNRAS.328L...1S
History: From electronic version of the journal References: Riess et al. Paper I. 2009ApJS..183..109R Cat. J/ApJS/183/109 Riess et al. 2011ApJ...730..119R
(End) Emmanuelle Perret [CDS] 24-Jun-2011
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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