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Detection of a stellar halo in NGC 4244

  • A. Seth (a1), R. de Jong (a2) and J. Dalcanton (a3)
  • DOI: http://dx.doi.org/10.1017/S1743921307009003
  • Published online: 01 December 2006
Abstract
Abstract

We present the preliminary detection of a stellar halo in the nearby, edge-on galaxy, NGC 4244. Using data from the Hubble Space Telescope's Advanced Camera for Surveys (HST/ACS), we have examined number counts of red giant branch (RGB) stars along the minor axis of the galaxy out to 10 kpc, with a limiting surface brightness of μR ∼ 31 mag/arcsec2. At distances more than 2.5 kpc above the disk, a second stellar component is clearly visible. This component is well fit by either an exponential or a power law. The best-fit exponential scale height is similar to the scale length of the galaxy disk, suggesting that we are indeed detecting a halo component. Furthermore, the color of the RGB stars above 2.5 kpc are significantly bluer than those in the disk, suggesting a more metal-poor population. Outside the local group, this finding represents one of the first detections of a resolved stellar halo in a spiral galaxy.

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Linked references
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This list contains references from the content that can be linked to their source. For a full set of references and notes please see the PDF or HTML where available.

J. S. Bullock , & K. V. Johnston 2005, ApJ, 635, 931

A. M. Fry , H. L. Morrison , P. Harding , & T. A. Boroson 1999, AJ, 118, 1209

J. S. Kalirai , 2006, ApJ, 648, 389

A. W. McConnachie , 2006, ApJL, 647, L25

A. C. Seth , J. J. Dalcanton , & R. S. de Jong 2005a, AJ, 129, 1331

A. C. Seth 2005b, AJ, 130, 1574

S. Zibetti , S. D. M. White , & J. Brinkmann 2004, MNRAS, 347, 556

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Proceedings of the International Astronomical Union
  • ISSN: 1743-9213
  • EISSN: 1743-9221
  • URL: /core/journals/proceedings-of-the-international-astronomical-union
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