J/ApJ/907/112 The astrophysical distance scale. III. The WLM gal. (Lee+, 2021)
The astrophysical distance scale.
III. Distance to the Local Group galaxy WLM using multiwavelength observations
of the tip of the red giant branch, Cepheids, and JAGB stars.
Lee A.J., Freedman W.L., Madore B.F., Owens K.A., Monson A.J., Hoyt T.J.
<Astrophys. J., 907, 112 (2021)>
=2021ApJ...907..112L 2021ApJ...907..112L
ADC_Keywords: Local group; Galaxies, photometry; Stars, variable;
Stars, giant
Keywords: Distance indicators ; Population II stars ; Asymptotic giant
branch stars ; Carbon stars ; Observational cosmology ; Hubble
constant ; Cepheid variable stars
Abstract:
The local determination of the Hubble constant sits at a crossroad.
Current estimates of the local expansion rate of the universe differ
by about 1.7σ, derived from the Cepheid- and TRGB-based
calibrations, applied to Type Ia supernovae. To help elucidate
possible sources of systematic error causing the tension, we show in
this study the recently developed distance indicator, the J-region
Asymptotic Giant Branch (JAGB) method, can serve as an independent
cross-check and comparison with other local distance indicators.
Furthermore, we make the case that the JAGB method has substantial
potential as an independent, precise, and accurate calibrator of Type
Ia supernovae for the determination of H0. Using the Local Group
galaxy Wolf-Lundmark-Melotte (WLM), we present distance comparisons
between the JAGB method, a TRGB measurement at near-infrared (JHK)
wavelengths, a TRGB measurement in the optical I band, and a
multiwavelength Cepheid period-luminosity relation determination. We
find
µ0(JAGB)=24.97±0.02(stat)±0.04(sys)mag
µ0(TRGBNIR)=24.98±0.04(stat)±0.07(sys)mag
µ0(TRGBF814W=24.93±0.02(stat)±0.06(sys)mag
µ0(Cepheids)=24.98±0.03(stat)±0.04(sys)mag.
All four methods are in good agreement, confirming the local
self-consistency of the four distance scales at the 3% level and
adding confidence that the JAGB method is as accurate and as precise a
distance indicator as either of the other three astrophysically based
methods.
Description:
Ground-based VI data of WLM were obtained at the Inamori-Magellan
Areal Camera and Spectrograph (IMACS) on the 6.5m Magellan-Baade
telescope using the f/4 imaging mode at Las Campanas Observatory on
2019 November 16. The field has a dimension of 15.4x15.4'at a scale of
0.111"/pixel.
We utilized HST archival data in order to calibrate the I-band
ground-based photometry to the Vegamag magnitude system. We found one
HST/ACS data set of WLM in the HST archives that overlapped with the
IMACS chips: Completing the Census of Isolated Dwarf Galaxy Star
Formation Histories (Weisz 2014, PID: GO13768, PI: Weisz). This data
set contained F814W data (the HST filter corresponding to the
Kron-Cousins I band) and observations taken on 2015 July 17-19.
See Section 2.1.2.
Ground-based JHK data were taken at the 6.5m Magellan-Baade telescope
at Las Campanas Observatory with the FourStar Infrared Camera. The
FourStar imager has a field of view of 10.8x10.8' and a resolution of
0.159"/pixel. The first set of observations, taken on 2011 September
7, targeted the NIR TRGB and JAGB stars. The second set of
observations, taken on 2011 October 5, also targeted JAGB stars.
Finally, the third set of observations, used for calibration purposes,
was taken on 2019 November 13.
See Section 2.2.
Objects:
----------------------------------------------------------
RA (ICRS) DE Designation(s)
----------------------------------------------------------
00 01 57.90 -15 27 49.9 WLM = NAME WLM Galaxy
----------------------------------------------------------
File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
cepheids.dat 78 60 Cepheids in the Local Group irregular galaxy WLM;
table added by CDS and taken from
Pietrzynski+ 2007, J/AJ/134/594 (Table 1)
lcs/* . 60 *Individual GLOESS-fit light curves in VIJHK
in ASCII format (Data behind Figure 7)
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Note on lcs/* : The majority of archival VI data originate from
Pietrzynski+ (2007, J/AJ/134/594), and J, K originate from
Gieren+ (2008ApJ...683..611G 2008ApJ...683..611G). Single-epoch J-band observations were
added from Valcheva+ (2007, J/A+A/466/501) when available. New
single-epoch observations in the I-band were added from our own IMACS
observations, and 2 epoch observations were added in J, H, K from our
FourStar observations.
--------------------------------------------------------------------------------
Description of files:
apjabd253f7.tar.gz is the original file for the "Data behind Figure 7".
The 60 Cepheid light-curve data are in MRT format.
See also:
B/hst : HST Archived Exposures Catalog (STScI, 2007)
J/A+A/466/501 : JKs photometry of WLM galaxy carbon stars (Valcheva+, 2007)
J/A+A/474/35 : JKs photometry of C stars in IC10 and WLM (Battinelli+, 2007)
J/AJ/134/594 : Araucaria project: Cepheids in WLM galaxy (Pietrzynski+, 2007)
J/ApJ/715/277 : Insights into the Cepheid distance scale (Bono+, 2010)
J/AJ/143/74 : HST photometry in 6 dwarf galaxies (Bianchi+, 2012)
J/ApJ/800/51 : DUSTiNGS II. Metal-poor dusty AGB stars (Boyer+, 2015)
J/ApJ/877/110 : SPIRITS cat. of IR long period variables (Karambelkar+, 2019)
Byte-by-byte Description of file: cepheids.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 A3 --- --- [cep]
4- 5 I02 --- cep [1/60] Cepheid identification
(<[PGU2007] cepNN> in Simbad)
7 I1 h RAh [0] Hour of Right Ascension (J2000)
9- 10 I2 min RAm [1/2] Minute of Right Ascension (J2000)
12- 16 F5.2 s RAs Second of Right Ascension (J2000)
18 A1 --- DE- [-] Sign of the Declination (J2000)
19- 20 I2 deg DEd [15] Degree of Declination (J2000)
22- 23 I2 arcmin DEm [19/33] Arcminute of Declination (J2000)
25- 28 F4.1 arcsec DEs Arcsecond of Declination (J2000)
30- 37 F8.5 d Per [1.6/54.2] Period
39- 51 F13.5 d T0 JD of maximum brightness in the V band
53- 58 F6.3 mag Vmag [19.12/22.98] Mean V band intensity magnitude
60- 65 F6.3 mag Imag [18.14/22.54]? Mean I band intensity magnitude
67- 72 F6.3 mag WImag [16.6/22]? Mean Wesenheit band intensity
magnitude, defined as WI=I-1.55(V-I)
74- 78 A5 --- Rem Additional remark (1)
--------------------------------------------------------------------------------
Note (1): Entries beginning with "V" give the Cepheid identifications of
Sandage and Carlson (1985AJ.....90.1464S 1985AJ.....90.1464S, [SC85b] VNN in Simbad).
--------------------------------------------------------------------------------
Byte-by-byte Description of file: lcs/*
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 14 F14.6 d JD Julian Date
16- 21 F6.3 mag Imag [18.8/24.1]?=99.99 I-band magnitude
23- 27 F5.3 mag e_Imag [0.007/0.8]?=9.99 I-band magnitude error
29- 34 F6.3 mag Vmag [18/23.6]?=99.99 V-band magnitude
36- 41 F6.4 mag e_Vmag [0.002/1]?=9.99 V-band magnitude error
43- 48 F6.3 mag Jmag [17/21.8]?=99.99 J-band magnitude
50- 55 F6.4 mag e_Jmag [0/0.5]?=9.99 J-band magnitude error
57- 62 F6.3 mag Hmag [16.9/20.7]?=99.99 H-band magnitude
64- 69 F6.4 mag e_Hmag [0.003/0.2]?=9.99 H-band magnitude error
71- 76 F6.3 mag Kmag [16.7/21.5]?=99.99 K-band magnitude
78- 83 F6.4 mag e_Kmag [0.005/0.6]?=9.99 K-band magnitude error
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History:
From electronic version of the journal for Data behind Figure 7.
Table of Cepheids from Pietrzynski+ 2007, J/AJ/134/594 (Table 1)
References:
Madore et al. Paper I. 2020ApJ...899...66M 2020ApJ...899...66M
Freedman et al. Paper II. 2020ApJ...899...67F 2020ApJ...899...67F
Madore et al. Paper IV. 2022ApJ...926..153M 2022ApJ...926..153M
(End) Prepared by [AAS], Coralie Fix [CDS], 17-Jun-2022