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Title: The bright unidentified γ-ray source 1FGL J1227.9–4852: Can it be associated with a low-mass X-ray binary? [The bright unidentified γ-ray source 1FGL J1227.9–4852: Can it be associated with an LMXB?]

Abstract

We present an analysis of high energy (HE; 0.1–300 GeV) γ-ray observations of 1FGL J1227.9–4852 with the Fermi Gamma-ray Space Telescope, follow-up radio observations with the Australia Telescope Compact Array, Giant Metrewave Radio Telescope and Parkes radio telescopes of the same field and follow-up optical observations with the ESO VLT. We also examine archival XMMNewton and INTEGRAL X-ray observations of the region around this source. The γ-ray spectrum of 1FGL J1227.9–4852 is best fitted with an exponentially cut-off power law, reminiscent of the population of pulsars observed by Fermi. A previously unknown, compact radio source within the 99.7 per cent error circle of 1FGL J1227.9–4852 is discovered and has a morphology consistent either with an AGN core/jet structure or with two roughly symmetric lobes of a distant radio galaxy. A single bright X-ray source XSS J12270–4859, a low-mass X-ray binary, also lies within the 1FGL J1227.9–4852 error circle and we report the first detection of radio emission from this source. The potential association of 1FGL J1227.9–4852 with each of these counterparts is discussed. Based upon the available data we find the association of the γ-ray source to the compact double radio source unlikely and suggest that XSS J12270–4859 ismore » a more likely counterpart to the new HE source. As a result, we propose that XSS J12270–4859 may be a millisecond binary pulsar and draw comparisons with PSR J1023+0038.« less

Authors:
 [1];  [2];  [3];  [4];  [5];  [6];  [1];  [7];  [8];  [6];  [3];  [9];  [10]
  1. Univ. Joseph Fourier Grenoble I/CNRS, Grenoble (France)
  2. Univ. Joseph Fourier Grenoble I/CNRS, Grenoble (France); Jagiellonian Univ., Krakow (Poland)
  3. Univ. Paris 7 Denis Diderot and Service d'Astrophysique, Gif sure Yvette (France)
  4. Columbia Univ., New York, NY (United States)
  5. NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States); Univ. of Maryland Baltimore County (UMBC), Baltimore, MD (United States)
  6. Stanford Univ., Stanford, CA (United States)
  7. CSIRO Astronomy and Space Science, Epping, NSW (Australia)
  8. NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)
  9. Jagiellonian Univ., Krakow (Poland)
  10. Jagiellonian Univ., Krakow (Poland); Institute of Space and Astronautical Science, Kanagawa (Japan)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1357228
Grant/Contract Number:  
AC02-76SF00515
Resource Type:
Accepted Manuscript
Journal Name:
Monthly Notices of the Royal Astronomical Society
Additional Journal Information:
Journal Volume: 415; Journal Issue: 1; Journal ID: ISSN 0035-8711
Publisher:
Royal Astronomical Society
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; pulsars: general; galaxies: active; gamma-rays: general; radio continuum: galaxies; X-rays: individual: XSS J12270−4859

Citation Formats

Hill, A. B., Szostek, A., Corbel, S., Camilo, F., Corbet, R. H. D., Dubois, R., Dubus, G., Edwards, P. G., Ferrara, E. C., Kerr, M., Koerding, E., Kozieł, D., and Stawarz, Ł. The bright unidentified γ-ray source 1FGL J1227.9–4852: Can it be associated with a low-mass X-ray binary? [The bright unidentified γ-ray source 1FGL J1227.9–4852: Can it be associated with an LMXB?]. United States: N. p., 2011. Web. doi:10.1111/j.1365-2966.2011.18692.x.
Hill, A. B., Szostek, A., Corbel, S., Camilo, F., Corbet, R. H. D., Dubois, R., Dubus, G., Edwards, P. G., Ferrara, E. C., Kerr, M., Koerding, E., Kozieł, D., & Stawarz, Ł. The bright unidentified γ-ray source 1FGL J1227.9–4852: Can it be associated with a low-mass X-ray binary? [The bright unidentified γ-ray source 1FGL J1227.9–4852: Can it be associated with an LMXB?]. United States. doi:10.1111/j.1365-2966.2011.18692.x.
Hill, A. B., Szostek, A., Corbel, S., Camilo, F., Corbet, R. H. D., Dubois, R., Dubus, G., Edwards, P. G., Ferrara, E. C., Kerr, M., Koerding, E., Kozieł, D., and Stawarz, Ł. Fri . "The bright unidentified γ-ray source 1FGL J1227.9–4852: Can it be associated with a low-mass X-ray binary? [The bright unidentified γ-ray source 1FGL J1227.9–4852: Can it be associated with an LMXB?]". United States. doi:10.1111/j.1365-2966.2011.18692.x. https://www.osti.gov/servlets/purl/1357228.
@article{osti_1357228,
title = {The bright unidentified γ-ray source 1FGL J1227.9–4852: Can it be associated with a low-mass X-ray binary? [The bright unidentified γ-ray source 1FGL J1227.9–4852: Can it be associated with an LMXB?]},
author = {Hill, A. B. and Szostek, A. and Corbel, S. and Camilo, F. and Corbet, R. H. D. and Dubois, R. and Dubus, G. and Edwards, P. G. and Ferrara, E. C. and Kerr, M. and Koerding, E. and Kozieł, D. and Stawarz, Ł.},
abstractNote = {We present an analysis of high energy (HE; 0.1–300 GeV) γ-ray observations of 1FGL J1227.9–4852 with the Fermi Gamma-ray Space Telescope, follow-up radio observations with the Australia Telescope Compact Array, Giant Metrewave Radio Telescope and Parkes radio telescopes of the same field and follow-up optical observations with the ESO VLT. We also examine archival XMM–Newton and INTEGRAL X-ray observations of the region around this source. The γ-ray spectrum of 1FGL J1227.9–4852 is best fitted with an exponentially cut-off power law, reminiscent of the population of pulsars observed by Fermi. A previously unknown, compact radio source within the 99.7 per cent error circle of 1FGL J1227.9–4852 is discovered and has a morphology consistent either with an AGN core/jet structure or with two roughly symmetric lobes of a distant radio galaxy. A single bright X-ray source XSS J12270–4859, a low-mass X-ray binary, also lies within the 1FGL J1227.9–4852 error circle and we report the first detection of radio emission from this source. The potential association of 1FGL J1227.9–4852 with each of these counterparts is discussed. Based upon the available data we find the association of the γ-ray source to the compact double radio source unlikely and suggest that XSS J12270–4859 is a more likely counterpart to the new HE source. As a result, we propose that XSS J12270–4859 may be a millisecond binary pulsar and draw comparisons with PSR J1023+0038.},
doi = {10.1111/j.1365-2966.2011.18692.x},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 1,
volume = 415,
place = {United States},
year = {2011},
month = {7}
}

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