J/ApJ/891/85 Manganese abundances in GC & dSph galaxies (de los Reyes+, 2020)
Manganese indicates a transition from sub- to near-Chandrasekhar Type Ia
supernovae in dwarf galaxies.
de los Reyes M.A.C., Kirby E.N., Seitenzahl I.R., Shen K.J.
<Astrophys. J., 891, 85 (2020)>
=2020ApJ...891...85D 2020ApJ...891...85D
ADC_Keywords: Abundances; Spectra, optical; Clusters, globular;
Galaxies, spectra; Effective temperatures
Keywords: Dwarf spheroidal galaxies ; Dwarf galaxies ;
Sculptor dwarf elliptical galaxy ; SNe Ia ; Chemical abundances ;
Galaxy abundances ; Stellar abundances
Abstract:
Manganese abundances are sensitive probes of the progenitors of TypeIa
supernovae (SNe Ia). In this work, we present a catalog of manganese
abundances in dwarf spheroidal satellites of the Milky Way, measured
using medium-resolution spectroscopy. Using a simple chemical
evolution model, we infer the manganese yield of SNe Ia in the
Sculptor dwarf spheroidal galaxy (dSph) and compare to theoretical
yields. The sub-solar yield from SNIa ([Mn/Fe]Ia=-0.30-0.03+0.03
at [Fe/H]=-1.5dex, with negligible dependence on metallicity) implies
that sub-Chandrasekhar-mass (sub-MCh) white dwarf progenitors are the
dominant channel of SNe Ia at early times in this galaxy, although
some fraction (≳20%) of MCh Type Ia or Type Iax SNe are still
needed to produce the observed yield. First-order corrections for
deviations from local thermodynamic equilibrium increase the inferred
[Mn/Fe]Ia by as much as ∼0.3dex. However, our results also suggest
that the nucleosynthetic source of SNe Ia may depend on environment.
In particular, we find that dSphs with extended star formation
histories (Leo I, Fornax dSphs) appear to have higher [Mn/Fe] at a
given metallicity than galaxies with early bursts of star formation
(Sculptor dSph), suggesting that MCh progenitors may become the
dominant channel of SNe Ia at later times in a galaxy's chemical
evolution.
Description:
Medium-resolution spectroscopy (MRS, R=4500 at 5000Å) was performed
using the DEep Imaging Multi-Object Spectrograph (DEIMOS) on the
KeckII telescope between 2017 Sep and 2019 Mar. Table 1 details the
observations for each field.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 107 18 Spectroscopic targets
table3.dat 28 10931 Full line list
table4.dat 31 51 Effect of varying atmospheric parameters
on [Mn/Fe] measurements
table7.dat 118 241 Manganese abundance catalog of globular cluster
(GC) and dwarf spheroidal galaxy (dSph) stars
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See also:
VII/195 : Globular Clusters in the Milky Way (Harris, 1996)
VII/202 : Globular Clusters in the Milky Way (Harris, 1997)
J/AJ/131/2949 : Mn abundances in cluster and field stars (Sobeck+, 2006)
J/A+A/447/685 : Elemental abundance analyses. XXIX. (Adelman+, 2006)
J/A+A/467/665 : Manganese abundances in the Galactic disk (Feltzing+, 2007)
J/A+A/501/519 : Extremely metal-poor turnoff stars abund. (Bonifacio+, 2009)
J/ApJ/705/328 : Abundance measurements in Sculptor dSph (Kirby+, 2009)
J/ApJ/708/560 : Spectroscopy of UMa II and Coma Ber (Frebel+, 2010)
J/A+A/520/A95 : Abundances of red giants in M54 and Sgr dSph (Carretta+, 2010)
J/ApJ/722/1373 : ω Centauri giants abundances (Johnson+, 2010)
J/A+A/523/A17 : Individual stars in Fornax dSph center (Letarte+, 2010)
J/ApJS/191/352 : Abundances in stars of MW dwarf satellites (Kirby+, 2010)
J/A+A/527/A18 : EW of 6 subgiants of ω Cen (Pancino+, 2011)
J/AJ/141/175 : Abundances in M15 RGB/RHB stars (Sobeck+, 2011)
J/AJ/144/4 : Dwarf galaxies in the Local Group (McConnachie+, 2012)
J/ApJ/789/147 : Star formation histories of LG dwarf galaxies (Weisz+, 2014)
J/ApJ/791/101 : Terzan 5 chemical and kinematical properties (Massari+, 2014)
J/ApJ/817/53 : Fe-group elemental abundances in HD84937 (Sneden+, 2016)
J/ApJ/819/135 : Lithium-rich giants in globular clusters (Kirby+, 2016)
J/ApJ/847/16 : NLTE sp. II. Galactic metal-poor stars (Bergemann+, 2017)
J/ApJS/237/18 : Cr, Co, and Ni abund. for metal-poor red giants (Kirby+, 2018)
J/ApJ/869/50 : Barium abundances of red giant branch stars (Duggan+, 2018)
J/A+A/631/A43 : Late-type stars FeI & FeII NLTE lines (Mashonkina+, 2019)
J/A+A/631/A80 : Mn lines formation in late-type stars (Bergemann+, 2019)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- OT GC=globular cluster or
dSph=dwarf spheroidal galaxy
6- 21 A16 --- Name GC or dSph name
23- 30 A8 --- OName NGC identifier
32- 33 I2 h RAh Hour of right ascension (J2000)
35- 36 I2 min RAm Minute of right ascension (J2000)
38- 39 I2 s RAs Second of right ascension (J2000)
41 A1 --- DE- Sign of declination (J2000)
42- 43 I2 deg DEd Degree of declination (J2000)
45- 46 I2 arcmin DEm Arcminute of declination (J2000)
48- 49 I2 arcsec DEs Arcsecond of declination (J2000)
51- 55 F5.1 kpc Dist [10.4/254] Distance
57- 62 A6 --- Slit Slitmask identifier
64- 66 I3 --- Ns [21/182] Number of stars
68- 78 A11 "Y:M:D" Date Date of observation (UT)
80- 82 F3.1 --- Airmass [1/2] Airmass
84- 86 F3.1 arcsec Seeing [0.6/1.6]? Seeing
88- 101 A14 s Exp Exposure times
103- 107 A5 --- AName Abbreviated name as used in Table 7;
column added by CDS
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 8 F8.3 0.1nm lambda [4729/6501.9] Spectral line wavelength
10- 14 F5.1 --- Ion [4.1/607] Atomic species in MOOG format (1)
16- 21 F6.3 eV ExPot [0/26.6] Excitation potential
23- 28 F6.3 --- log(gf) [-10/1.11] Oscillator strength
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Note (1): Atomic species are denoted using the MOOG (Sneden et al. 2012;
2012ascl.soft02009S) format of Z.i, where Z is the atomic number of
the element and i is its ionization state.
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- Gal Name of galaxy ("Scl"=Sculptor dSph)
5- 11 I7 --- ID [1003702/1200017] ID of star;
<[KGS2010] Scl NNNNNNN> in Simbad
13- 16 F4.2 --- dTeff125K [0/0.05] Average change in [Mn/Fe] from
varying Teff by 125K
18- 21 F4.2 --- dTeff250K [0/0.08] Average change in [Mn/Fe] from
varying Teff by 250K
23- 26 F4.2 --- dlogg03 [0/0.09] Average change in [Mn/Fe] from
varying log(g) by 0.3dex
28- 31 F4.2 --- dlogg06 [0/0.17] Average change in [Mn/Fe] from
varying log(g) by 0.6dex
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Byte-by-byte Description of file: table7.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 5 A5 --- AName Abbreviated name of galaxy or GC
7- 24 A18 --- ID ID of star
26- 27 I2 h RAh Hour of Right Ascension (J2000)
29- 30 I2 min RAm Minute of Right Ascension (J2000)
32- 36 F5.2 s RAs Second of Right Ascension (J2000)
38 A1 --- DE- Sign of the Declination (J2000)
39- 40 I2 deg DEd Degree of Declination (J2000)
42- 43 I2 arcmin DEm Arcminute of Declination (J2000)
45- 49 F5.2 arcsec DEs Arcsecond of Declination (J2000)
51- 54 I4 K Teff [3769/5368] Effective temperature (1)
56- 61 F6.2 K e_Teff [9/140]? Error in Teff (1)
63- 66 F4.2 [cm/s2] log(g) [0.2/3.4] Surface gravity (1)
68- 71 F4.2 [cm/s2] e_log(g) [0.1/0.2]? Error in log(g) (1)
73- 76 F4.2 km/s xi [1.35/2.11] Microturbulent velocity (1)
78- 81 F4.2 km/s e_xi [0.05/0.11]? Error in xi (1)
83- 87 F5.2 [-] [a/Fe] [-0.8/1.2] Alpha-element log abundance (1)
89- 93 F5.2 [-] e_[a/Fe] [0.08/0.6] Error in [a/Fe] (1)
95- 99 F5.2 [-] [Fe/H] [-2.93/-0.61] Iron logarithmic abundance (1)
101-105 F5.2 [-] e_[Fe/H] [0.1/0.4] Mean error in FeH (1)
107-112 F6.3 [-] [Mn/Fe] [-0.94/1.2] Manganese-to-iron log abundance
114-118 F5.3 [-] e_[Mn/Fe] [0.1/0.3] Mean error in [Mn/Fe] (2)
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Note (1): From Kirby+ (2010, J/ApJS/191/352) for dSph galaxies, and from
Kirby+ (2016, J/ApJ/819/135) for globular clusters.
Note (2): The errors reported here are total errors (statistical and systematic
errors added in quadrature). The statistical (fitting) errors can be
obtained by removing the contribution from the systematic error,
which we estimate (cf. Section 3.2.3) to be σsys=0.10dex.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 09-Aug-2021