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Discovery of an extended, halo-like stellar population around the Large Magellanic Cloud

Published online by Cambridge University Press:  01 July 2008

Steven R. Majewski ,
David L. Nidever ,
Ricardo R. Muñoz ,
Richard J. Patterson ,
William E. Kunkel  and
Jeffrey L. Carlin
Steven R. Majewski
Affiliation:
Department of Astronomy, University of Virginia, Charlottesville, VA, 22904-4325, USA email: [email protected], [email protected], [email protected], [email protected], [email protected]
David L. Nidever
Affiliation:
Department of Astronomy, University of Virginia, Charlottesville, VA, 22904-4325, USA email: [email protected], [email protected], [email protected], [email protected], [email protected]
Ricardo R. Muñoz
Affiliation:
Department of Astronomy, University of Virginia, Charlottesville, VA, 22904-4325, USA email: [email protected], [email protected], [email protected], [email protected], [email protected]
Richard J. Patterson
Affiliation:
Department of Astronomy, University of Virginia, Charlottesville, VA, 22904-4325, USA email: [email protected], [email protected], [email protected], [email protected], [email protected]
William E. Kunkel
Affiliation:
Las Campanas Observatory, Carnegie Institution of Washington, Casilla 601, La Serena, Chile email: [email protected]
Jeffrey L. Carlin
Affiliation:
Department of Astronomy, University of Virginia, Charlottesville, VA, 22904-4325, USA email: [email protected], [email protected], [email protected], [email protected], [email protected]
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Abstract

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We describe an ongoing, large-scale, photometric and spectroscopic survey of the Large Magellanic Cloud (LMC) periphery. This survey uses Washington M, T2 + DDO51 photometry to identify distant LMC red giant branch (RGB) star candidates; multi-object spectroscopy is used to confirm the stellar surface gravities of these RGB stars and their association with the LMC (e.g., through radial velocities). The survey now encompasses hundreds of fields ranging from the LMC center with full azimuthal coverage around the LMC and out to 23° from the LMC center. We have confirmed the existence of RGB stars with (the unusual) Magellanic velocities out to the radial limit of this survey coverage. From data in a subsample of these fields, we show that this extended population of stars makes up a diffuse structure enveloping the LMC with a two-dimensional distribution resembling a classical halo with a shallow de Vaucouleurs profile and a broad metallicity spread around a typical mean value of [Fe/H] ~ −1.0.

Keywords

surveysgalaxies: evolutiongalaxies: halosgalaxies: individual (LMC)Magellanic Cloudsgalaxies: structure
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 4 , Symposium S256: The Magellanic System: Stars, Gas, and Galaxies , July 2008 , pp. 51 - 56
Copyright
Copyright © International Astronomical Union 2009

References

Alves, D. R. 2004, ApJ, 601, L151CrossRefGoogle Scholar
Besla, G., Kallivayalil, N., Hernquist, L., Robertson, B., Cox, T. J., van der Marel, R. P., & Alcock, C. 2007, ApJ, 668, 949CrossRefGoogle Scholar
Borissova, J., Minniti, D., Rejkuba, M., Alves, D., Cook, K. H., & Freeman, K. C. 2004, A&A, 423, 97Google Scholar
Borissova, J., Minniti, D., Rejkuba, M., & Alves, D. 2006, A&A, 460, 459Google Scholar
Chapman, S. C., Ibata, R., Lewis, G. F., Ferguson, A. M. N., Irwin, M., McConnachie, A., & Tanvir, N. 2006, ApJ, 653, 255CrossRefGoogle Scholar
Diemand, J., Kuhlen, M., & Madau, P. 2007, ApJ, 657, 262Google Scholar
D'Onghia, E. 2008, ApJ submitted, arXiv:0802.0302Google Scholar
Guhathakurta, P., Ostheimer, J. C., & Gilbert, K. M., et al. 2005, arXiv:astro-ph/0502366Google Scholar
Harris, J. 2007, ApJ, 658, 345Google Scholar
Harris, J. & Zaritsky, D. 2004, AJ, 127, 1531CrossRefGoogle Scholar
Kalirai, J. S., Gilbert, C. M., & Guhathakurta, P., et al. 2006, ApJ, 648, 389Google Scholar
Kallivayalil, N., van der Marel, R. P., Alcock, C., Axelrod, T., Cook, K. H., Drake, A. J., & Geha, M. 2006, ApJ, 638, 772CrossRefGoogle Scholar
Kunkel, W. E., Demers, S., Irwin, M. J., & Albert, L. 1997, ApJ, 488, L129CrossRefGoogle Scholar
Majewski, S. R., Ostheimer, J. C., Kunkel, W. E., Johnston, K. V., Patterson, R. J., & Palma, C. 1999, in Chu, Y.-H., Suntzeff, N., Hesser, J., & Bohlender, D. (eds.), New Views of the Magellanic Clouds, IAU Symposium 190, p. 508Google Scholar
Majewski, S. R., Ostheimer, J. C., Kunkel, W. E., & Patterson, R. J. 2000, AJ, 120, 2550CrossRefGoogle Scholar
Majewski, S. R. 2004, PASA, 21, 197Google Scholar
McConnachie, A. W., Chapman, S. C., Ibata, R. A., Ferguson, A. M. N., Irwin, M. J., Lewis, G. F., Tanvir, N. R., & Martin, N. 2006, ApJL, 647, L25Google Scholar
Minniti, D., Borissova, J., Rejkuba, M., Alves, D. R., Cook, K. H., & Freeman, K. C. 2003, Science, 301, 1508CrossRefGoogle Scholar
Muñoz, R. R., Majewski, S. R., & Zaggia, S., et al. 2006, ApJ, 649, 201CrossRefGoogle Scholar
Ostheimer, J. C. 2002, Ph. D. dissertation, University of VirginiaGoogle Scholar
Sarajedini, A., Barker, M. K., Geisler, D., Harding, P., & Schommer, R. 2006, AJ, 132, 1361CrossRefGoogle Scholar
Schiavon, R. P. 2007, ApJS, 171, 146Google Scholar
van der Marel, R. P. 2001, AJ, 122, 1827Google Scholar
van der Marel, R. P., Alves, D. R., Hardy, E., & Suntzeff, N. B. 2002, AJ, 124, 2639Google Scholar
Weinberg, D. 2000, ApJ, 532, 922CrossRefGoogle Scholar
Zartisky, D., Harris, J., Thompson, I. B., Grebel, E. K.. & Massey, P. 2002, AJ, 123, 855CrossRefGoogle Scholar
Zartisky, D., Harris, J., Thompson, I. B., & Grebel, E. K. 2004, AJ, 128, 1606CrossRefGoogle Scholar