J/ApJ/920/84 HST photometry of 55 cepheids in M31 (Li+, 2021)
A Sub-2% Distance to M31 from Photometrically Homogeneous Near-infrared Cepheid
Period-Luminosity Relations Measured with the Hubble Space Telescope.
Li S.,Riess A.G.,Busch M.P.,Casertano S.,Macri L.M.,Yuan W.
<Astrophys. J., 920, 84 (2021)>
=2021ApJ...920...84L 2021ApJ...920...84L
ADC_Keywords: Stars, variable; Photometry, infrared; Optical
Keywords: Cepheid variable stars ; Galaxies ; Cepheid distance ;
Cosmology ; Observational astronomy ; Observational cosmology ;
Hubble Space Telescope ; Near infrared astronomy ; Optical
astronomy
Abstract:
We present period-luminosity relations (PLRs) for 55 Cepheids in M31
with periods ranging from 4 to 78 days observed with the Hubble Space
Telescope using the same three-band photometric system recently used
to calibrate their luminosities. Images were taken with the Wide Field
Camera 3 in two optical filters (F555W and F814W) and one
near-infrared filter (F160W) using the Drift and Shift (DASH) mode of
operation to significantly reduce overheads and observe widely
separated Cepheids in a single orbit. We include additional F160W
epochs for each Cepheid from the Panchromatic Hubble Andromeda
Treasury and use light curves from the Panoramic Survey Telescope and
Rapid Response System of the Andromeda galaxy project to determine
mean magnitudes. Combined with a 1.28% absolute calibration of Cepheid
PLRs in the Large Magellanic Cloud from Riess et al. in the same three
filters, we find a distance modulus to M31 of µ0=24.407±0.032,
corresponding to 761±11kpc and 1.49% uncertainty including all
error sources, the most precise determination of its distance to date.
We compare our results to past measurements using Cepheids and the tip
of the red giant branch. This study also provides the groundwork for
turning M31 into a precision anchor galaxy in the cosmic distance
ladder to measure the Hubble constant together with efforts to measure
a fully geometric distance to M31.
Description:
We obtained multi-epoch Hubble Space Telescope (HST) images of 57
Cepheids in M31 in two WFC3-UVIS optical filters (F555W and F814W) and
one WFC3-IR near-infrared filter (F160W) as part of program GO-15146
(PI: Riess) using Drift and Shift (DASH). Exposure times were 10s for
F555W and F814W and 21.3s for F160W.
Objects:
-----------------------------------------
RA (ICRS) DE Designation(s)
-----------------------------------------
00 42 44.33 +41 16 07.5 M31 = 2C 56
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 80 462 Observations of M31 cepheids
table2.dat 122 55 *Photometric results for M31 cepheids
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Note on table2.dat: Gold sample errors are calculated by adding the
photometric and template errors in quadrature. An intrinsic scatter of
0.069mag from Riess+, 2019, J/ApJ/876/85 is added to the NIR Wesenheit
in quadrature after propagation. Silver sample F555W, F814W, and F160W
mean magnitude errors are calculated by adding in quadrature the
photometric errors for each epoch and dividing by the square root of
the number of epochs used. These errors are propagated into the VIS
and NIR Wesenheit indices. We add a random phase error of 0.13mag from
Macri, 2015, J/AJ/149/117 in the VIS and NIR Wesenheits in quadrature
with the propagated uncertainties as well as the intrinsic scatter of
0.069 to the NIR Wesenheit index. Geometric corrections have been
added to the VIS and NIR Wesenheits magnitudes in this table.
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See also:
J/A+A/509/A70 : Study of an eclipsing binary in M31 (Vilardell+, 2010)
J/ApJ/730/119 : HST/WFC3 observations of Cepheids in SN Ia hosts (Riess+, 2011)
J/ApJ/758/11 : Bayesian distances to M31 satellites (Conn+, 2012)
J/ApJ/745/156 : M31 Cepheids with HST/WFC3 (Riess+, 2012)
J/ApJ/758/133 : Metallicity profile of M31 HII regions and PNe (Sanders+, 2012)
J/A+A/576/A30 : NIR light-curve templates for classical Cepheids (Inno+, 2015)
J/AJ/149/117 : LMC infrared survey. I. Photometry of Cepheids (Macri+, 2015)
J/MNRAS/451/724 : PHAT. XIII. M31 Cepheid P-L relation (Wagner-Kaiser+, 2015)
J/ApJ/826/56 : HST/WFC3 obs. of Cepheids in SN Ia host gal. (Riess+, 2016)
J/AJ/156/130 : Cepheids in M31 - PAndromeda Cepheid sample (Kodric+, 2018)
J/ApJ/864/59 : M31 PAndromeda Cepheid sample in four HST bands (Kodric+, 2018)
J/MNRAS/482/5138 : Galactic GC proper motions & velocities (Baumgardt+, 2019)
J/ApJ/876/85 : HST observations for LMC Cepheids (Riess+, 2019)
J/ApJ/886/61 : OGLE-III, MCPS and HST VI obs. of LMC & SMC (Yuan+, 2019)
J/ApJ/896/3 : Cosmicflows-4 Tully-Fisher relation calib. (Kourkchi+, 2020)
J/AJ/160/199 : Estimated distances ∼12000 galaxies with NED-D (Steer, 2020)
J/ApJ/902/26 : HST opt. & H-band obs. of Cepheids in NGC4151 (Yuan+, 2020)
J/ApJ/913/38 : Compilation of Cepheids in the MW and MCs (Breuval+, 2021)
J/ApJ/906/125 : Carnegie-Chicago Hubble Program IX. TRGB in M106 (Jang+, 2021)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 22 A22 --- ID Target identifier
24- 29 A6 --- Frame Frame identifier
31- 35 A5 --- Filt Filter used; F160W, F555W, or F814W
37- 47 F11.5 d MJD [55560/58136] Modified Julian Date; MJD-2400000.5
49- 53 F5.1 s Texp [5/500] Exposure time
55- 60 F6.1 pix Xpix [4.5/1013]? X pixel coordinate
62- 67 F6.1 pix Ypix [20.6/1006]? Y pixel coordinate
69- 75 A7 --- Prog Program identifier; GO15146 or PHAT
77- 80 A4 --- Flag Observation flag (1)
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Note (1): Flags as follows:
1 = Excessive drift, PSF semi-major axis greater than 3 pixels for
F555W and F814W and 2 pixels for F160W (7 occurrences)
2 = Cepheid is not fully in frame (15 occurrences)
3 = Cepheid matching algorithm from Riess+, 2019, J/ApJ/876/85 has fewer
than 10 matches and the Cepheid could not be found visually
(10 occurrences)
4 = Cepheid removed because all images in one or more filters
were unrecoverable due to flags 1-3 (17 occurrences)
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 22 A22 --- ID Cepheid identifier
24- 29 F6.3 deg RAdeg [10/12] Right Ascension (J2000)
31- 36 F6.3 deg DEdeg [41/42] Declination (J2000)
38- 43 F6.3 d Per [4.13/76.6] Period
45- 50 F6.3 mag F160W [16.2/20.3] HST/WFC3 F160W mean magnitude
52- 56 F5.3 mag e_F160W [0.03/0.2] Uncertainty in F160Wmag
58- 63 F6.3 mag F814W [17.8/21.6] HST/WFC3 F814W mean magnitude
65- 69 F5.3 mag e_F814W [0.03/0.3] Uncertainty in F814Wmag
71- 76 F6.3 mag F555W [19.7/22.5] HST/WFC3 F555W mean magnitude
78- 82 F5.3 mag e_F555W [0.04/0.5] Uncertainty in F555Wmag
84- 89 F6.3 mag mWH [15.4/19.9] Wesenheit NIR H band index (1)
91- 95 F5.3 mag e_mWH [0.09/0.3] Uncertainty in mWH
97-102 F6.3 mag mWI [15/20.4] Wesenheit visible I band index (1)
104-108 F5.3 mag e_mWI [0.1/0.8] Uncertainty in mWI
110-115 F6.3 mag GCor [-0.007/0.03] Geometric correction from M31 center
117-122 A6 --- Sample Sample identifier
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Note (1): Where mWV=F814Wmag-1.3(F555Wmag-F814Wmag) &
mWH=F160Wmag-0.386(F555Wmag-F814Wmag).
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 28-Feb-2023