THE PAndAS VIEW of the ANDROMEDA SATELLITE SYSTEM. II. DETAILED PROPERTIES of 23 M31 DWARF SPHEROIDAL GALAXIES

Nicolas F. Martin; Rodrigo A. Ibata; Geraint F. Lewis; Alan McConnachie; Arif Babul; Nicholas F. Bate; Edouard Bernard; Scott C. Chapman; Michelle M.L. Collins; Anthony R. Conn; Denija Crnojević; Mark A. Fardal; Annette M.N. Ferguson; Michael Irwin; A. Dougal Mackey; Brendan McMonigal; Julio F. Navarro; R. Michael Rich

doi:10.3847/1538-4357/833/2/167

THE PAndAS VIEW of the ANDROMEDA SATELLITE SYSTEM. II. DETAILED PROPERTIES of 23 M31 DWARF SPHEROIDAL GALAXIES

Nicolas F. Martin, Rodrigo A. Ibata, Geraint F. Lewis, Alan McConnachie, Arif Babul, Nicholas F. Bate, Edouard Bernard, Scott C. Chapman, Michelle M.L. Collins, Anthony R. Conn, Denija Crnojević, Mark A. Fardal, Annette M.N. Ferguson, Michael Irwin, A. Dougal Mackey, Brendan McMonigal, Julio F. Navarro, R. Michael Rich

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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 Andromedas known satellite dwarf galaxies and cover a wide range in luminosity (-11.6 ≲M_V ≲-5.8 or 10^4.2 ≲L ≲106.5 L) and surface brightness (25.1 ≲μ₀ ≲29.3mag arcsec^-2). We confirm most previous measurements, but we find And XIX to be significantly larger than before (rh= 3065⁺¹⁰⁶⁵ ^-935 pc, M_v= -10.1^{+ 0.8} _-0.4) 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 ∼ 105 L. Finally, we provide the first detailed analysis of Cas II/And XXX, a fairly faint system (M₄=- 8.0 ^+0.4 _-0.3) of typical size (rh = 270 ± 50 pc), 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.

Original language	English
Article number	167
Journal	Astrophysical Journal
Volume	833
Issue number	2
DOIs	https://doi.org/10.3847/1538-4357/833/2/167
Publication status	Published - 20 Dec 2016

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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., Crnojević, D., Fardal, M. A., Ferguson, A. M. N., Irwin, M., Mackey, A. D., McMonigal, B., Navarro, J. F., & Rich, R. M. (2016). THE PAndAS VIEW of the ANDROMEDA SATELLITE SYSTEM. II. DETAILED PROPERTIES of 23 M31 DWARF SPHEROIDAL GALAXIES. Astrophysical Journal, 833(2), Article 167. https://doi.org/10.3847/1538-4357/833/2/167

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title = "THE PAndAS VIEW of the ANDROMEDA SATELLITE SYSTEM. II. DETAILED PROPERTIES of 23 M31 DWARF SPHEROIDAL GALAXIES",

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 Andromedas known satellite dwarf galaxies and cover a wide range in luminosity (-11.6 ≲MV ≲-5.8 or 104.2 ≲L ≲106.5 L) and surface brightness (25.1 ≲μ0 ≲29.3mag arcsec-2). We confirm most previous measurements, but we find And XIX to be significantly larger than before (rh= 3065+1065 -935 pc, Mv= -10.1+ 0.8 -0.4) 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 ∼ 105 L. Finally, we provide the first detailed analysis of Cas II/And XXX, a fairly faint system (M4=- 8.0 +0.4 -0.3) of typical size (rh = 270 ± 50 pc), 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.",

keywords = "Local Group, galaxies: dwarf",

author = "Martin, {Nicolas F.} and Ibata, {Rodrigo A.} and Lewis, {Geraint F.} and Alan McConnachie and Arif Babul and Bate, {Nicholas F.} and Edouard Bernard and Chapman, {Scott C.} and Collins, {Michelle M.L.} and Conn, {Anthony R.} and Denija Crnojevi{\'c} and Fardal, {Mark A.} and Ferguson, {Annette M.N.} and Michael Irwin and Mackey, {A. Dougal} and Brendan McMonigal and Navarro, {Julio F.} and Rich, {R. Michael}",

note = "Publisher Copyright: {\textcopyright} 2016 Published by Elsevier B.V.",

year = "2016",

month = dec,

day = "20",

doi = "10.3847/1538-4357/833/2/167",

language = "English",

volume = "833",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "American Astronomical Society",

number = "2",

}

Martin, NF, Ibata, RA, Lewis, GF, McConnachie, A, Babul, A, Bate, NF, Bernard, E, Chapman, SC, Collins, MML, Conn, AR, Crnojević, D, Fardal, MA, Ferguson, AMN, Irwin, M, Mackey, AD, McMonigal, B, Navarro, JF & Rich, RM 2016, 'THE PAndAS VIEW of the ANDROMEDA SATELLITE SYSTEM. II. DETAILED PROPERTIES of 23 M31 DWARF SPHEROIDAL GALAXIES', Astrophysical Journal, vol. 833, no. 2, 167. https://doi.org/10.3847/1538-4357/833/2/167

TY - JOUR

T1 - THE PAndAS VIEW of the ANDROMEDA SATELLITE SYSTEM. II. DETAILED PROPERTIES of 23 M31 DWARF SPHEROIDAL GALAXIES

AU - Martin, Nicolas F.

AU - Ibata, Rodrigo A.

AU - Lewis, Geraint F.

AU - McConnachie, Alan

AU - Babul, Arif

AU - Bate, Nicholas F.

AU - Bernard, Edouard

AU - Chapman, Scott C.

AU - Collins, Michelle M.L.

AU - Conn, Anthony R.

AU - Crnojević, Denija

AU - Fardal, Mark A.

AU - Ferguson, Annette M.N.

AU - Irwin, Michael

AU - Mackey, A. Dougal

AU - McMonigal, Brendan

AU - Navarro, Julio F.

AU - Rich, R. Michael

PY - 2016/12/20

Y1 - 2016/12/20

N2 - 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 Andromedas known satellite dwarf galaxies and cover a wide range in luminosity (-11.6 ≲MV ≲-5.8 or 104.2 ≲L ≲106.5 L) and surface brightness (25.1 ≲μ0 ≲29.3mag arcsec-2). We confirm most previous measurements, but we find And XIX to be significantly larger than before (rh= 3065+1065 -935 pc, Mv= -10.1+ 0.8 -0.4) 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 ∼ 105 L. Finally, we provide the first detailed analysis of Cas II/And XXX, a fairly faint system (M4=- 8.0 +0.4 -0.3) of typical size (rh = 270 ± 50 pc), 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.

AB - 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 Andromedas known satellite dwarf galaxies and cover a wide range in luminosity (-11.6 ≲MV ≲-5.8 or 104.2 ≲L ≲106.5 L) and surface brightness (25.1 ≲μ0 ≲29.3mag arcsec-2). We confirm most previous measurements, but we find And XIX to be significantly larger than before (rh= 3065+1065 -935 pc, Mv= -10.1+ 0.8 -0.4) 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 ∼ 105 L. Finally, we provide the first detailed analysis of Cas II/And XXX, a fairly faint system (M4=- 8.0 +0.4 -0.3) of typical size (rh = 270 ± 50 pc), 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.

KW - Local Group

KW - galaxies: dwarf

UR - http://www.scopus.com/inward/record.url?scp=85007590654&partnerID=8YFLogxK

U2 - 10.3847/1538-4357/833/2/167

DO - 10.3847/1538-4357/833/2/167

M3 - Article

SN - 0004-637X

VL - 833

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 2

M1 - 167

ER -

THE PAndAS VIEW of the ANDROMEDA SATELLITE SYSTEM. II. DETAILED PROPERTIES of 23 M31 DWARF SPHEROIDAL GALAXIES

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