J/ApJ/906/125 The Carnegie-Chicago Hubble Program IX. TRGB in M106 (Jang+, 2021)
The Carnegie-Chicago Hubble Program.
IX. Calibration of the Tip of the Red Giant Branch Method in the Megamaser Host
Galaxy, NGC 4258 (M106).
Jang In S., Hoyt T.J., Beaton R.L., Freedman W.L., Madore B.F., Lee M.G.,
Neeley J.R., Monson A.J., Rich J.A., Seibert M.
<Astrophys. J., 906, 125 (2021)>
=2021ApJ...906..125J 2021ApJ...906..125J
ADC_Keywords: Stars, giant; Photometry, HST; Optical
Keywords: Distance measure ; Galaxy distances ; Stellar distance ; Linear
regression ; Stellar populations ; Population II stars ; Galaxy
stellar halos ; Galaxy stellar disks
Abstract:
In the nearby galaxy NGC4258, the well-modeled orbital motion of H2O
masers about its supermassive black hole provides the means to measure
a precise geometric distance. As a result, NGC4258 is one of a few
"geometric anchors" available to calibrate the true luminosities of
stellar distance indicators such as the Tip of the Red Giant Branch
(TRGB) or the Cepheid Leavitt law. In this paper, we present a
detailed study of the apparent magnitude of the TRGB within NGC4258,
using publicly available HST observations optimally situated in the
unreddened stellar halo along the minor axis, spanning distances
ranging from 8 to 22kpc in projected galactocentric radius, or 6'
(13kpc) to 30' (66kpc) in distance along the semimajor axis. We
undertake a systematic evaluation of the uncertainties associated with
measuring the TRGB in this galaxy, based on an analysis of 54arcmin2
of HST/ACS imaging. After quantifying these uncertainties, we measure
the TRGB in NGC4258 to be
F814W0=25.347±0.014(stat)±0.042(sys)mag. Combined with a
recent 1.5% megamaser distance to NGC4258, we determine the absolute
luminosity of the TRGB to be
MF814WTRGB-4.050±0.028(stat)±0.048(sys)mag. This new
calibration agrees to better than 1% with an independent calibration
presented in Freedman et al. that was based on detached eclipsing
binaries (DEBs) located in the LMC.
Description:
Details on the observations are given in table1.
Objects:
-------------------------------------------
RA (2000) DE Designation(s)
-------------------------------------------
12 18 57.62 +47 18 13.4 NGC 4258 = M 106
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 83 15 Archival HST/ACS images used in this study
table3.dat 73 75 A List of bright and isolated stars used for the
aperture correction
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See also:
J/ApJ/652/1133 : BVI photometry of NGC 4258 Cepheids (Macri+, 2006)
J/AJ/138/332 : LEDA CMD/tip of the red giant branch (Jacobs+, 2009)
J/ApJ/826/56 : HST/WFC3 obs. of Cepheids in SN Ia host gal. (Riess+, 2016)
J/ApJ/845/146 : The Carnegie-Chicago Hubble Program. II. IC 1613 (Hatt+, 2017)
J/ApJS/235/23 : LEGUS galaxies1 observations (Sabbi+, 2018)
J/ApJ/859/L8 : Properties of TriAnd stars (Hayes+, 2018)
J/ApJ/886/61 : OGLE-III, MCPS and HST VI obs. of LMC & SMC (Yuan+, 2019)
http://acszeropoints.stsci.edu/ : ACS zeropoint online calculator
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 A3 --- Field Field identifier
5- 6 I2 h RAh [12] Hour of right ascension (J2000)
8- 9 I2 min RAm [19] Minute of right ascension (J2000)
11- 15 F5.2 s RAs [18.3/60] Second of right ascension (J2000)
17 A1 --- DE- [+] Sign of declination (J2000)
18- 19 I2 deg DEd [47] Degree of declination (J2000)
21- 22 I2 arcmin DEm [17/22] Arcminute of declination
24- 27 F4.1 arcsec DEs Arcsecond of declination
29- 32 F4.1 arcmin Rad [4.2/10.5] Radius
34- 37 F4.1 arcmin a [11/24.8] Semimajor axis (1)
39- 42 F4.1 kpc LEDA [24.3/54.7] HyperLEDA (2)
44- 47 I4 s Texp555 [900/5700] Exposure time for F555W
49- 52 I4 s Texp814 [900/2600] Exposure time for F814W
54- 57 I4 yr Obs.Y [2003/2005] Year of observation
59- 60 I2 "month" Obs.M Month of observation
62- 63 I2 d Obs.d Day of observation
65- 70 F6.3 --- F555-0 [25.7/25.8] Zero points for F555W (3)
72- 77 F6.3 --- F814-0 [25.5/25.6] Zero points for F814W (3)
79- 83 I5 --- PropID [9477/10399] Prop.ID
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Note (1): Semimajor axis of the stellar disk that has a position angle of
150deg and an inclination angle of 68.3deg.
Note (2): Assuming the distance of D=7.58Mpc from Reid+, 2019ApJ...886L..27R 2019ApJ...886L..27R.
Note (3): From the ACS zero-point calculator (http://acszeropoints.stsci.edu/).
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 I2 --- ID [1/75] Identifier number
4- 5 I2 h RAh [12] Hour of Right Ascension (J2000)
7- 8 I2 min RAm [19/20] Minute of Right Ascension (J2000)
10- 15 F6.3 s RAs Second of Right Ascension (J2000)
17 A1 --- DE- [+] Sign of declination (J2000)
18- 19 I2 deg DEd [47] Degree of Declination (J2000)
21- 22 I2 arcmin DEm [16/23] Arcminute of Declination (J2000)
24- 28 F5.2 arcsec DEs Arcsecond of Declination (J2000)
30- 35 F6.3 mag F814W [18.58/23.5]? HST/ACS F814W filter magnitude (1)
37- 41 F5.3 mag e_F814W [0.001/0.03]? Uncertainty in F814W
43- 44 I2 --- o_F814W [1/11]? Number of independent measurements from
different FLC frames in F814W
46- 50 F5.3 --- std814W [0/0.06]? Standard deviation of independent
measurements in F814W
52- 57 F6.3 mag F555W [18.911/24.6]? HST/ACS F555W filt magnitude (1)
59- 64 F6.3 mag e_F555W [0.001/0.02]? Uncertainty in F555W
66- 67 I2 --- o_F555W [1/11]? Number of independent measurements from
different FLC frames in F555W
69- 73 F5.3 --- std555W [0/0.05]? Standard deviation of independent
measurements in F555W
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Note (1): Measured at a 5 pixel apreture radius.
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History:
From electronic version of the journal
References:
Beaton et al. Paper I : 2016ApJ...832..210B 2016ApJ...832..210B
Hatt et al. Paper II : 2017ApJ...845..146H 2017ApJ...845..146H Cat. J/ApJ/845/146
Jang et al. Paper III : 2018ApJ...852...60J 2018ApJ...852...60J
Hatt et al. Paper IV : 2018ApJ...861..104H 2018ApJ...861..104H
Hatt et al. Paper V : 2018ApJ...866..145H 2018ApJ...866..145H
Hoyt et al. Paper VI : 2019ApJ...882..150H 2019ApJ...882..150H
Beaton et al. Paper VII : 2019ApJ...885..141B 2019ApJ...885..141B
Freedman et al. Paper VIII : 2019ApJ...882...34F 2019ApJ...882...34F
Hoyt et al. Paper X : 2021ApJ...915...34H 2021ApJ...915...34H
(End) Prepared by [AAS], Coralie Fix [CDS], 18-May-2022