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Title: PROBING THE GC-LMXB CONNECTION IN NGC 1399: A WIDE-FIELD STUDY WITH THE HUBBLE SPACE TELESCOPE AND CHANDRA

Abstract

We present a wide-field study of the globular cluster (GC)/low-mass X-ray binary (LMXB) connection in the giant elliptical NGC 1399. The large field of view of the Advanced Camera for Surveys/WFC, combined with Hubble Space Telescope and Chandra high resolution, allow us to constrain the LMXB formation scenarios in elliptical galaxies. We confirm that NGC 1399 has the highest LMXB fraction in GCs of all nearby elliptical galaxies studied so far, even though the exact value depends on galactocentric distance due to the interplay of a differential GC versus galaxy light distribution and the GC color dependence. In fact, LMXBs are preferentially hosted by bright, red GCs out to >5 R{sub eff} of the galaxy light. The finding that GCs hosting LMXBs follow the radial distribution of their parent GC population argues against the hypothesis that the external dynamical influence of the galaxy affects the LMXB formation in GCs. On the other hand, field-LMXBs closely match the host galaxy light, thus indicating that they are originally formed in situ and not inside GCs. We measure GC structural parameters, finding that the LMXB formation likelihood is influenced independently by mass, metallicity, and GC structural parameters. In particular, the GC central densitymore » plays a major role in predicting which GCs host accreting binaries. Finally, our analysis shows that LMXBs in GCs are marginally brighter than those in the field, and in particular the only color-confirmed GC with L{sub X} > 10{sup 39} erg s{sup -1} shows no variability, which may indicate a superposition of multiple LMXBs in these systems.« less

Authors:
 [1];  [2];  [3];  [4];  [5];  [6];  [7];  [8]
  1. Department of Physical Sciences, University of Napoli Federico II, 80126 Napoli (Italy)
  2. Herzberg Institute of Astrophysics, Victoria, BC V9E 2E7 (Canada)
  3. Space Telescope Science Institute, Baltimore, MD 21218 (United States)
  4. Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824 (United States)
  5. School of Physics and Astronomy, University of Southampton, Southampton SO17 1BJ (United Kingdom)
  6. Eureka Scientific, Oakland, CA 94602 (United States)
  7. Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138 (United States)
  8. Laboratory for High Energy Astrophysics, NASA Goddard Space Flight Center, Code 660, Greenbelt, MD 20771 (United States)
Publication Date:
OSTI Identifier:
21578272
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 736; Journal Issue: 2; Other Information: DOI: 10.1088/0004-637X/736/2/90; Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; SPATIAL DISTRIBUTION; STAR CLUSTERS; X-RAY GALAXIES; COSMIC RAY SOURCES; COSMIC X-RAY SOURCES; DISTRIBUTION; GALAXIES

Citation Formats

Paolillo, Maurizio, Puzia, Thomas H., Goudfrooij, Paul, Zepf, Stephen E., Maccarone, Thomas J., Kundu, Arunav, Fabbiano, Giuseppina, and Angelini, Lorella, E-mail: paolillo@na.infn.it. PROBING THE GC-LMXB CONNECTION IN NGC 1399: A WIDE-FIELD STUDY WITH THE HUBBLE SPACE TELESCOPE AND CHANDRA. United States: N. p., 2011. Web. doi:10.1088/0004-637X/736/2/90.
Paolillo, Maurizio, Puzia, Thomas H., Goudfrooij, Paul, Zepf, Stephen E., Maccarone, Thomas J., Kundu, Arunav, Fabbiano, Giuseppina, & Angelini, Lorella, E-mail: paolillo@na.infn.it. PROBING THE GC-LMXB CONNECTION IN NGC 1399: A WIDE-FIELD STUDY WITH THE HUBBLE SPACE TELESCOPE AND CHANDRA. United States. doi:10.1088/0004-637X/736/2/90.
Paolillo, Maurizio, Puzia, Thomas H., Goudfrooij, Paul, Zepf, Stephen E., Maccarone, Thomas J., Kundu, Arunav, Fabbiano, Giuseppina, and Angelini, Lorella, E-mail: paolillo@na.infn.it. Mon . "PROBING THE GC-LMXB CONNECTION IN NGC 1399: A WIDE-FIELD STUDY WITH THE HUBBLE SPACE TELESCOPE AND CHANDRA". United States. doi:10.1088/0004-637X/736/2/90.
@article{osti_21578272,
title = {PROBING THE GC-LMXB CONNECTION IN NGC 1399: A WIDE-FIELD STUDY WITH THE HUBBLE SPACE TELESCOPE AND CHANDRA},
author = {Paolillo, Maurizio and Puzia, Thomas H. and Goudfrooij, Paul and Zepf, Stephen E. and Maccarone, Thomas J. and Kundu, Arunav and Fabbiano, Giuseppina and Angelini, Lorella, E-mail: paolillo@na.infn.it},
abstractNote = {We present a wide-field study of the globular cluster (GC)/low-mass X-ray binary (LMXB) connection in the giant elliptical NGC 1399. The large field of view of the Advanced Camera for Surveys/WFC, combined with Hubble Space Telescope and Chandra high resolution, allow us to constrain the LMXB formation scenarios in elliptical galaxies. We confirm that NGC 1399 has the highest LMXB fraction in GCs of all nearby elliptical galaxies studied so far, even though the exact value depends on galactocentric distance due to the interplay of a differential GC versus galaxy light distribution and the GC color dependence. In fact, LMXBs are preferentially hosted by bright, red GCs out to >5 R{sub eff} of the galaxy light. The finding that GCs hosting LMXBs follow the radial distribution of their parent GC population argues against the hypothesis that the external dynamical influence of the galaxy affects the LMXB formation in GCs. On the other hand, field-LMXBs closely match the host galaxy light, thus indicating that they are originally formed in situ and not inside GCs. We measure GC structural parameters, finding that the LMXB formation likelihood is influenced independently by mass, metallicity, and GC structural parameters. In particular, the GC central density plays a major role in predicting which GCs host accreting binaries. Finally, our analysis shows that LMXBs in GCs are marginally brighter than those in the field, and in particular the only color-confirmed GC with L{sub X} > 10{sup 39} erg s{sup -1} shows no variability, which may indicate a superposition of multiple LMXBs in these systems.},
doi = {10.1088/0004-637X/736/2/90},
journal = {Astrophysical Journal},
issn = {0004-637X},
number = 2,
volume = 736,
place = {United States},
year = {2011},
month = {8}
}