CaltechAUTHORS
  A Caltech Library Service

Kinematics and Metallicities in the Boötes III Stellar Overdensity: A Disrupted Dwarf Galaxy?

Carlin, Jeffrey L. and Grillmair, Carl J. and Muñoz, Ricardo R. and Nidever, David L. and Majewski, Steven R. (2009) Kinematics and Metallicities in the Boötes III Stellar Overdensity: A Disrupted Dwarf Galaxy? Astrophysical Journal Letters, 702 (1). L9-L13. ISSN 2041-8205. https://resolver.caltech.edu/CaltechAUTHORS:20090910-122014872

[img]
Preview
PDF - Published Version
See Usage Policy.

325Kb

Use this Persistent URL to link to this item: https://resolver.caltech.edu/CaltechAUTHORS:20090910-122014872

Abstract

We report the results of a spectroscopic study of the Boötes III (BooIII) stellar overdensity carried out with the Hectospec multifiber spectrograph on the MMT telescope. Radial velocities have been measured for 193 BooIII candidate stars selected to have magnitudes and colors consistent with its upper main sequence and lower red giant branch, as well as a number of horizontal-branch candidates. From 20 identified candidate BooIII members, we measure a systemic velocity of V_☉ = 197.5 ± 3.8 km s^(–1) and a velocity dispersion of σ_o = 14.0 ± 3.2 km s^(–1). We use the somewhat large velocity dispersion and the implied highly radial orbit, along with morphological evidence from Grillmair and stellar abundances, to argue that BooIII is likely the first known object observed in a transitional state between being a bound dwarf galaxy and a completely unbound tidal stream.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1088/0004-637X/702/1/L9DOIArticle
http://www.iop.org/EJ/abstract/1538-4357/702/1/L9/PublisherArticle
ORCID:
AuthorORCID
Carlin, Jeffrey L.0000-0002-3936-9628
Grillmair, Carl J.0000-0003-4072-169X
Majewski, Steven R.0000-0003-2025-3147
Additional Information:© 2009 American Astronomical Society. Print publication: Issue 1 (2009 September 1); received 2009 June 12; accepted for publication 2009 July 24 Published 2009 August 11. We thank the anonymous referee for helpful suggestions and gratefully acknowledge support by NSF grant AST-0807945 and NASA/JPL contract 1228235.
Group:Infrared Processing and Analysis Center (IPAC)
Funders:
Funding AgencyGrant Number
NSFAST-0807945
NASA/JPL1228235
Subject Keywords:galaxies: individual (Boötes)
Issue or Number:1
Record Number:CaltechAUTHORS:20090910-122014872
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20090910-122014872
Official Citation:Kinematics and Metallicities in the Boötes III Stellar Overdensity: A Disrupted Dwarf Galaxy? Jeffrey L. Carlin, Carl J. Grillmair, Ricardo R. Muñoz, David L. Nidever, and Steven R. Majewski 2009 ApJ 702 L9-L13 doi: 10.1088/0004-637X/702/1/L9
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:15729
Collection:CaltechAUTHORS
Deposited By: Jason Perez
Deposited On:15 Sep 2009 17:06
Last Modified:09 Mar 2020 13:19

Repository Staff Only: item control page