J/ApJ/745/156 M31 Cepheids with HST/WFC3 (Riess+, 2012)
Cepheid period-luminosity relations in the near-infrared and the distance to
M31 from the Hubble Space Telescope Wide Field Camera 3.
Riess A.G., Fliri J., Valls-Gabaud D.
<Astrophys. J., 745, 156 (2012)>
=2012ApJ...745..156R 2012ApJ...745..156R
ADC_Keywords: Stars, variable ; Photometry, HST ; Infrared sources;
Galaxies, nearby
Keywords: cosmological parameters; cosmology: observations; distance scale;
galaxies: distances and redshifts; stars: variables: Cepheids
Abstract:
We present measurements of 68 classical Cepheids, most detected from
the Canada-France-Hawaii Telescope POMME Survey, with periods from 10
to 78 days observed in the near-infrared by the Panchromatic Hubble
Andromeda Treasury Program using the Wide Field Camera 3 (WFC3) on the
Hubble Space Telescope (HST). The combination of HST's resolution and
the use of near-infrared measurements provide a dramatic reduction in
the dispersion of the period-luminosity relation over the present
optical, ground-based data. Even using random phase magnitudes we
measure a dispersion of just 0.17mag, implying a dispersion of just
0.12mag for mean magnitudes. The error in the mean for this relation
is 1% in distance. Combined with similar observations of Cepheids in
other hosts and independent distance determinations, we measure a
distance to M31 of µ0=24.38±0.06(statistical)±0.03(systematic),
752±27kpc, in good agreement with past measurements though with a
better, 3% precision here. The result is also in good agreement with
independent distance determinations from two detached eclipsing
binaries allowing for an independent calibration of the Cepheid
luminosities and a determination of the Hubble constant.
Description:
The Panchromatic Hubble Andromeda Treasury (PHAT) Program (Dalcanton
et al. 2012ApJS..200...18D 2012ApJS..200...18D) is imaging the northeast quadrant of M31
with WFC3 with two UV filters (F275W, F336W), two IR filters (F110W,
F160W), and two optical filters with ACS (F475W, F814W) over the
course of a three-year survey. Our primary source of positions and
periods of Cepheids was the recent POMME Survey from Megacam on CFHT
whose sample of >2500 Cepheids covering most of M31 is the largest
sample collected to date (Fliri et al. 2012Ap&SS.341...57F 2012Ap&SS.341...57F), with 180
in the north half of M31 with logP>1.
In the first year PHAT obtained data through the middle of 2011, and
65 long-period POMME Cepheids were contained in the Survey. These 65
were augmented with one object from DIRECT (Cat. J/AJ/126/175) and two
from the Pan-STARRS Survey data (Lee et al. 2013ApJ...777...35L 2013ApJ...777...35L).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 71 68 M31 Cepheids in WFC3 F160W and F110W
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See also:
J/AJ/145/106 : M31 Cepheid disk sample of 1st year of PS1 (Kodric+, 2013)
J/ApJ/752/95 : PHAT stellar cluster survey. I. Year 1 (Johnson+, 2012)
J/ApJ/730/119 : HST/WFC3 obs. of Cepheids in SN Ia hosts (Riess+, 2011)
J/A+A/509/A70 : Study of an eclipsing binary in M31 (Vilardell+, 2010)
J/other/A+ARV/15.289 : Distances of local galaxies (Tammann+, 2008)
J/A+A/445/423 : WeCAPP Survey. M31 variables (Fliri+, 2006)
J/A+A/421/509 : AGAPE catalogue of M31 variables (Ansari+, 2004)
J/MNRAS/351/1071 : POINT-AGAPE Survey. M31 variables (An+, 2004)
J/A+A/402/113 : (RI)c photometry of variables in M31 (Joshi+, 2003)
J/AJ/126/175 : M31Y eclipsing binaries and Cepheids (Bonanos+, 2003)
J/ApJ/504/113 : F175W and F275W photometry of M31 and M32 (Brown+, 1998)
J/A+AS/126/401 : M 31 Cepheids periods (Magnier+ 1997)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 9 F9.6 deg RAdeg [10.81/11.58] Right ascension (J2000)
11- 19 F9.6 deg DEdeg [41.15/42.22] Declination (J2000)
21- 31 A11 --- ID Identification (1)
33- 37 F5.2 d Per [10/78] Period
39- 43 F5.2 mag F160W [16/19.3] HST/WFC3 F160W magnitude (2)
45- 48 F4.2 mag e_F160W [0.03/0.05] F160W uncertainty (2)
50- 54 F5.2 mag F110W [16.5/19.7] HST/WFC3 F110W magnitude
56- 59 F4.2 mag e_F110W [0.02/0.2] F110W uncertainty
61- 65 F5.3 mag Bias [0/0.02] Photometric bias
67- 71 F5.3 [-] [O/H] [8.8/9.1] Metallicity, 12+log[O/H] based on
Zaritsky et al. (1994ApJ...420...87Z 1994ApJ...420...87Z)
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Note (1): Source of optical parameters for the Cepheids:
vn.* = Pixel Observations of M31 with MEgacam (POMME; J. Fliri et al.
2012Ap&SS.341...57F 2012Ap&SS.341...57F),
0* = Pan-STARRS (Lee et al. 2013ApJ...777...35L 2013ApJ...777...35L;
in Simbad);
D* = DIRECT (Bonanos et al. 2003, Cat. J/AJ/126/175;
<D31 JHHMMSS.s+DDMMSS.s> in Simbad).
Note (2): Includes absolute zero-point uncertainty of 0.03mag.
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History:
From electronic version of the journal
(End) Emmanuelle Perret [CDS] 08-Aug-2014