J/ApJ/799/144 M31 Cepheids in near-IR (Kodric+, 2015)
The M31 near-infrared period-luminosity relation and its non-linearity for
δ Cep variables with 0.5≤log(P)≤1.7.
Kodric M., Riffeser A., Seitz S., Snigula J., Hopp U., Lee C.-H.,
Koppenhoefer J., Bender R., Gieren W.
<Astrophys. J. 799, 144 (2015)>
=2015ApJ...799..144K 2015ApJ...799..144K
ADC_Keywords: Galaxies, nearby ; Stars, variable ; Photometry, HST
Keywords: catalogs - distance scale - galaxies: individual (M31, NGC 224) -
galaxies: star formation - Local Group - stars: variables: Cepheids
Abstract:
We present the largest M31 near-infrared (F110W (close to J band),
F160W (H band)) Cepheid sample so far. The sample consists of 371
Cepheids with photometry obtained from the HST PHAT program. The
sample of 319 fundamental mode Cepheids, 16 first overtone Cepheids
and 36 type II Cepheids, was identified using the median absolute
deviation (MAD) outlier rejection method we develop here. This method
does not rely on priors and allows us to obtain this clean Cepheid
sample without rejecting a large fraction of Cepheids. The obtained
Period-Luminosity relations (PLRs) have a very small dispersion, i.e.
0.155mag in F160W, despite using random phased observations. This
remarkably small dispersion allows us to determine that the PLRs are
significantly better described by a broken slope at ten days than a
linear slope. The use of our sample as an anchor to determine the
Hubble constant gives a 3.2% larger Hubble constant compared to the
Riess et al. (2012ApJ...745..156R 2012ApJ...745..156R, Cat. J/ApJ/745/156) sample.
Description:
Near-Infrared photometry (F110W and F160W) of the PAndromeda Cepheids
(Kodric et al., 2013AJ....145..106K 2013AJ....145..106K, Cat. J/AJ/145/106) that are
inside the HST PHAT program. The ground based optical photometry and
the light curves can be found in Kodric et al. (2013, Cat.
J/AJ/145/106).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table.dat 75 371 Cepheid coordinates and photometry
clipped.dat 75 42 *Clipped Cepheid coordinates and photometry
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Note on clipped.dat: The outlier rejection is discussed in section 3 of
the paper.
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See also:
J/ApJ/745/156 : M31 Cepheids with HST/WFC3 (Riess+, 2012)
J/AJ/145/106 : M31 Cepheid disk sample of 1st year of PS1 (Kodric+, 2013)
Byte-by-byte Description of file: clipped.dat table.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- --- [PSO]
5- 21 A17 --- PSO Cepheid identifier (JDDD.dddd+DD.dddd)
23- 30 F8.5 deg RAdeg Right ascension (J2000)
32- 39 F8.5 deg DEdeg Declination (J2000)
41- 46 F6.3 d Per [2/54] Period
48- 53 F6.3 mag F110W HST/ACS F110W magnitude
55- 59 F5.3 mag e_F110W F110W magnitude error
61- 66 F6.3 mag F160W HST/ACS F160W magnitude
68- 72 F5.3 mag e_F160W F160W magnitude error
74- 75 A2 --- Type Cepheid type: FM=Fundamental Mode,
FO=First Overtone, T2=Type-II Cepheid
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Acknowledgements:
Mihael Kodric, kodric(at)usm.lmu.de
(End) Mihael Kodric [Univ. Obs. Munich], Patricia Vannier [CDS] 30-Jan-2015