J/ApJ/833/167 PAndAS view of Andromeda satellites. II. (Martin+, 2016)
The PAndAS view of the Andromeda satellite system. II. Detailed properties of 23 M31 dwarf spheroidal galaxies. Martin N.F., Ibata R.A., Lewis G.F., McConnachie A., Babul A., Bate N.F., Bernard E., Chapman S.C., Collins M.M.L., Conn A.R., Crnojevic D., Fardal M.A., Ferguson A.M.N., Irwin M., Mackey A.D., McMonigal B., Navarro J.F., Rich R.M. <Astrophys. J., 833, 167-167 (2016)> =2016ApJ...833..167M (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, nearby ; Magnitudes, absolute ; Photometry, surface Keywords: galaxies: dwarf; Local Group Abstract: We present a comprehensive analysis of the structural properties and luminosities of the 23 dwarf spheroidal galaxies that fall within the footprint of the Pan-Andromeda Archaeological Survey (PAndAS). These dwarf galaxies represent the large majority of Andromeda's known satellite dwarf galaxies and cover a wide range in luminosity (-11.6≲MV≲-5.8 or 104.2≲L≲106.5L☉) and surface brightness (25.1≲µ0≲29.3mag/arcsec2). We confirm most previous measurements, but we find And XIX to be significantly larger than before (rh=3065-935+1065pc, MV=-10.1-0.4+0.8) and cannot derive parameters for And XXVII as it is likely not a bound stellar system. We also significantly revise downward the luminosities of And XV and And XVI, which are now MV~-7.5 or L∼105L☉. Finally, we provide the first detailed analysis of Cas II/And XXX, a fairly faint system (MV=-8.0-0.3+0.4) of typical size (rh=270±50pc), located in close proximity to the two bright elliptical dwarf galaxies NGC 147 and NGC 185. Combined with the set of homogeneous distances published in an earlier contribution, our analysis dutifully tracks all relevant sources of uncertainty in the determination of the properties of the dwarf galaxies from the PAndAS photometric catalog. We further publish the posterior probability distribution functions of all the parameters we fit for in the form of MCMC chains available online; these inputs should be used in any analysis that aims to remain truthful to the data and properly account for covariance between parameters. Description: The specifics of the design, acquisition, reduction, and calibration of the Pan-Andromeda Archaeological Survey (PAndAS) survey have been explained in detail in previous contributions from our collaboration (e.g., Ibata+ 2014ApJ...780..128I). This Canada-France-Hawaii Telescope (CFHT) Large Program was built on two previous CFHT surveys led by R. Ibata and A. McConnachie (Ibata+ 2007ApJ...671.1591I; McConnachie+ 2008ApJ...688.1009M), which were further complemented by ∼230hr of observation with the same wide-field imager, MegaCam, in order to cover a contiguous region of ∼390deg2 within ∼150kpc of M31 and ∼50kpc of its companion M33. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 96 23 Derived structural parameters of the dwarf galaxies table2.dat 70 23 Derived luminosity-related properties of the dwarf galaxies table3.dat 109 11500 *Chains generated by the algorithm for the 23 dwarf spheroidal galaxies
Note on table3.dat: Table 3 is a concatenation of the 23 files contained in apjaa45d0.tar.gz file. Each file contains 500 randomly selected drawings from each chain for a single galaxy. Each row corresponds to a single drawing.
See also: J/ApJ/798/77 : Metallicity of RGB stars in 6 M31 dwarf galaxies (Ho+, 2015) J/ApJ/789/147 : Star formation histories of LG dwarf galaxies (Weisz+, 2014) J/ApJ/776/80 : PAndAS view of Andromeda satellites. I. (Martin+, 2013) J/ApJ/768/172 : Kinematic analysis of red giant in M31 dSphs (Collins+, 2013) J/ApJ/758/11 : Bayesian distances to M31 satellites (Conn+, 2012) J/AJ/144/4 : Dwarf galaxies in the Local Group (McConnachie+, 2012) J/MNRAS/380/281 : Faint galactic satellites spectrosc. survey (Martin+, 2007) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 8 A8 --- Gal Galaxy Name 10- 15 A6 --- Flag Flag(s) on Gal or other name (G1) 17- 18 I2 h RAh Hour of right ascension (J2000) 20- 21 I2 min RAm Minute of right ascension (J2000) 23- 26 F4.1 s RAs Second of right ascension (J2000) 28- 30 F3.1 s e_RAs [0.3/3] RA uncertainty 32 A1 --- DE- Sign of declination (J2000) 33- 34 I2 deg DEd Degree of declination (J2000) 36- 37 I2 arcmin DEm Arcminute of declination (J2000) 39- 40 I2 arcsec DEs Arcsecond of declination (J2000) 42- 43 I2 arcsec e_DEs [4/53] DE uncertainty 45- 48 F4.2 --- ell [0/0.7] Ellipticity ε 50- 53 F4.2 --- e_ell [0/0.5] Negative error on ell 55- 58 F4.2 --- E_ell [0.02/0.5] Positive error on ell 60- 62 I3 deg PA [-20/140] Position angle θ 64- 65 I2 deg e_PA [3/90] Negative error on PA 67- 68 I2 deg E_PA [3/90] Positive error on PA 70- 73 F4.1 arcmin rh [0.4/14.2] Half-light radius in arcminutes 75- 77 F3.1 arcmin e_rh [0.1/2] Negative error on rh 79- 81 F3.1 arcmin E_rh [0.1/3.4] Positive error on rh 83 A1 --- u_rhpc [~] Uncertainty flag on rhpc 84- 87 I4 pc rhpc Half-light radius in parsecs (G2) 89- 92 I4 pc e_rhpc [15/1065]? Negative error on rhpc 94- 96 I3 pc E_rhpc [30/935]? Positive error on rhpc
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 8 A8 --- Gal Galaxy name 10- 15 A6 --- Flag Flag(s) on Gal or other name (G1) 17- 20 F4.1 mag Vmag [12.4/18.5] Apparent magnitude mv,0 22- 24 F3.1 mag e_Vmag [0.2/0.5] Negative uncertainty on Vmag 26- 28 F3.1 mag E_Vmag [0.2/0.7] Positive uncertainty on Vmag 30- 34 F5.1 mag VMag [-11.6/-5.8] Absolute magnitude Mv,0 (G2) 36- 38 F3.1 mag e_VMag [0.2/1] Negative uncertainty on VMag 40- 42 F3.1 mag E_VMag [0.2/0.9] Positive uncertainty on VMag 44- 47 F4.2 [Lsun] logL [4.2/6.6] Log of the luminosity of the dwarf galaxy (G2) 49- 52 F4.2 [Lsun] e_logL [0.09/0.4] Negative uncertainty on logL 54- 57 F4.2 [Lsun] E_logL [0.09/0.4] Positive uncertainty on logL 59- 62 F4.1 mag/arcsec2 mu0 [25/29.3] Central surface brightness 64- 66 F3.1 mag/arcsec2 e_mu0 [0.2/1] Negative uncertainty on mu0 68- 70 F3.1 mag/arcsec2 E_mu0 [0.2/1] Positive uncertainty on mu0
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 8 A8 --- Gal Galaxy name 10- 19 F10.6 deg RAdeg Right ascension of the centroid (J2000) 21- 30 F10.6 deg DEdeg Declination of the centroid (J2000) 32- 35 F4.2 --- ell Ellipticity ε 37- 43 F7.1 deg PA [-90/230] Position angle θ 45- 49 F5.2 arcmin rh [0.2/29.4] Half-light radius rh in arcminutes (1) 51- 56 I6 pc rhpc [47/7120] Half-light radius rh in parsecs (1) 58- 61 F4.1 mag Vmag [11.8/21.4] Apparent magnitude mv,0 63- 67 F5.1 mag VMag [-12.2/-2.6] Absolute magnitude Mv,0 (2) 69- 81 F13.2 [Lsun] logL [2.9/6.8] Log of the luminosity of the dwarf galaxy (log10(LV/L☉) 83-100 F18.2 mag/arcsec2 mu0 [23.7/31] Central surface brightness 102-109 F8.2 mag DM [22.8/25.8] Distance modulus from Conn+ (2012, J/ApJ/758/11)
Note (1): The half-light radius as determined using a distance modulus value randomly drawn from the relevant chain provided by Conn+ (2012, J/ApJ/758/11). Note (2): Absolute magnitude MV,0, determined using the same distance modulus value as explain in Note (1) (Conn+ 2012, J/ApJ/758/11).
Global notes: Note (G1): Flag as follows: b = Substructure in the field may impact the structural parameters. c = Stricter priors were used to ensure convergence. See the text for more details Note (G2): Calculated using the posterior heliocentric distance PDFs calculated by Conn+ (2012, J/ApJ/758/11).
History: From electronic version of the journal References: Martin et al. Paper I. 2013ApJ...776...80M Cat. J/ApJ/776/80
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 24-Apr-2017
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