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Article: A bayesian approach to locating the red giant branch tip magnitude. II. Distances to the satellites of m31
Title  A bayesian approach to locating the red giant branch tip magnitude. II. Distances to the satellites of m31 

Authors  
Keywords  galaxies: stellar content galaxies: general Local Group 
Issue Date  2012 
Citation  Astrophysical Journal, 2012, v. 758, n. 1 How to Cite? 
Abstract  In "A Bayesian Approach to Locating the Red Giant Branch Tip Magnitude (Part I)," a new technique was introduced for obtaining distances using the tip of the red giant branch (TRGB) standard candle. Here we describe a useful complement to the technique with the potential to further reduce the uncertainty in our distance measurements by incorporating a matchedfilter weighting scheme into the model likelihood calculations. In this scheme, stars are weighted according to their probability of being true object members. We then retest our modified algorithm using randomrealization artificial data to verify the validity of the generated posterior probability distributions (PPDs) and proceed to apply the algorithm to the satellite system of M31, culminating in a threedimensional view of the system. Further to the distributions thus obtained, we apply a satellitespecific prior on the satellite distances to weight the resulting distance posterior distributions, based on the halo density profile. Thus in a single publication, using a single method, a comprehensive coverage of the distances to the companion galaxies of M31 is presented, encompassing the dwarf spheroidals Andromedas IIII, V, IXXXVII, and XXX along with NGC147, NGC185, M33, and M31 itself. Of these, the distances to Andromedas XXIVXXVII and Andromeda XXX have never before been derived using the TRGB. Object distances are determined from highresolution tip magnitude posterior distributions generated using the Markov Chain Monte Carlo technique and associated sampling of these distributions to take into account uncertainties in foreground extinction and the absolute magnitude of the TRGB as well as photometric errors. The distance PPDs obtained for each object both with and without the aforementioned prior are made available to the reader in tabular form. The large object coverage takes advantage of the unprecedented size and photometric depth of the PanAndromeda Archaeological Survey. Finally, a preliminary investigation into the satellite density distribution within the halo is made using the obtained distance distributions. For simplicity, this investigation assumes a single power law for the density as a function of radius, with the slope of this power law examined for several subsets of the entire satellite sample. © 2012. The American Astronomical Society. All rights reserved. 
Persistent Identifier  http://hdl.handle.net/10722/208957 
ISSN  2015 Impact Factor: 5.909 2015 SCImago Journal Rankings: 3.266 
DC Field  Value  Language 

dc.contributor.author  Conn, Anthony R.   
dc.contributor.author  Ibata, Rodrigo A.   
dc.contributor.author  Lewis, Geraint F.   
dc.contributor.author  Parker, Quentin A.   
dc.contributor.author  Zucker, Daniel B.   
dc.contributor.author  Martin, Nicolas F.   
dc.contributor.author  McConnachie, Alan W.   
dc.contributor.author  Irwin, Mike J.   
dc.contributor.author  Tanvir, Nial R.   
dc.contributor.author  Fardal, Mark A.   
dc.contributor.author  Ferguson, Annette M N   
dc.contributor.author  Chapman, Scott C.   
dc.contributor.author  VallsGabaud, David   
dc.date.accessioned  20150323T02:02:21Z   
dc.date.available  20150323T02:02:21Z   
dc.date.issued  2012   
dc.identifier.citation  Astrophysical Journal, 2012, v. 758, n. 1   
dc.identifier.issn  0004637X   
dc.identifier.uri  http://hdl.handle.net/10722/208957   
dc.description.abstract  In "A Bayesian Approach to Locating the Red Giant Branch Tip Magnitude (Part I)," a new technique was introduced for obtaining distances using the tip of the red giant branch (TRGB) standard candle. Here we describe a useful complement to the technique with the potential to further reduce the uncertainty in our distance measurements by incorporating a matchedfilter weighting scheme into the model likelihood calculations. In this scheme, stars are weighted according to their probability of being true object members. We then retest our modified algorithm using randomrealization artificial data to verify the validity of the generated posterior probability distributions (PPDs) and proceed to apply the algorithm to the satellite system of M31, culminating in a threedimensional view of the system. Further to the distributions thus obtained, we apply a satellitespecific prior on the satellite distances to weight the resulting distance posterior distributions, based on the halo density profile. Thus in a single publication, using a single method, a comprehensive coverage of the distances to the companion galaxies of M31 is presented, encompassing the dwarf spheroidals Andromedas IIII, V, IXXXVII, and XXX along with NGC147, NGC185, M33, and M31 itself. Of these, the distances to Andromedas XXIVXXVII and Andromeda XXX have never before been derived using the TRGB. Object distances are determined from highresolution tip magnitude posterior distributions generated using the Markov Chain Monte Carlo technique and associated sampling of these distributions to take into account uncertainties in foreground extinction and the absolute magnitude of the TRGB as well as photometric errors. The distance PPDs obtained for each object both with and without the aforementioned prior are made available to the reader in tabular form. The large object coverage takes advantage of the unprecedented size and photometric depth of the PanAndromeda Archaeological Survey. Finally, a preliminary investigation into the satellite density distribution within the halo is made using the obtained distance distributions. For simplicity, this investigation assumes a single power law for the density as a function of radius, with the slope of this power law examined for several subsets of the entire satellite sample. © 2012. The American Astronomical Society. All rights reserved.   
dc.language  eng   
dc.relation.ispartof  Astrophysical Journal   
dc.subject  galaxies: stellar content   
dc.subject  galaxies: general   
dc.subject  Local Group   
dc.title  A bayesian approach to locating the red giant branch tip magnitude. II. Distances to the satellites of m31   
dc.type  Article   
dc.description.nature  link_to_subscribed_fulltext   
dc.identifier.doi  10.1088/0004637X/758/1/11   
dc.identifier.scopus  eid_2s2.084866652451   
dc.identifier.volume  758   
dc.identifier.issue  1   
dc.identifier.eissn  15384357   