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Title: Discovery of a GeV blazar shining through the galactic plane

Abstract

The Fermi Large Area Telescope (LAT) discovered a new gamma-ray source near the Galactic plane, Fermi J0109+6134, when it flared brightly in 2010 February. The low Galactic latitude (b = –1$$ο\atop{.}$$2) indicated that the source could be located within the Galaxy, which motivated rapid multi-wavelength follow-up including radio, optical, and X-ray observations. Here, we report the results of analyzing all 19 months of LAT data for the source, and of X-ray observations with both Swift and the Chandra X-ray Observatory. We determined the source redshift, z = 0.783, using a Keck Low-Resolution Imaging Spectrometer observation. Finally, we compiled a broadband spectral energy distribution (SED) from both historical and new observations contemporaneous with the 2010 February flare. The redshift, SED, optical line width, X-ray absorption, and multi-band variability indicate that this new GeV source is a blazar seen through the Galactic plane. Because several of the optical emission lines have equivalent width >5 Å, this blazar belongs in the flat-spectrum radio quasar category.

Authors:
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Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
Contributing Org.:
The Fermi LAT Collaboration
OSTI Identifier:
1357541
Grant/Contract Number:  
AC02-76SF00515
Resource Type:
Accepted Manuscript
Journal Name:
Astrophysical Journal Letters
Additional Journal Information:
Journal Volume: 718; Journal Issue: 2; Journal ID: ISSN 2041-8205
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; galaxies active

Citation Formats

Vandenbroucke, J., Buehler, R., Ajello, M., Bechtol, K., Bellini, A., Bolte, M., Cheung, C. C., Civano, F., Donato, D., Fuhrmann, L., Funk, S., Healey, S. E., Hill, A. B., Knigge, C., Madejski, G. M., Romani, R. W., Santander-García, M., Shaw, M. S., Steeghs, D., Torres, M. A. P., Van Etten, A., and Williams, K. A.. Discovery of a GeV blazar shining through the galactic plane. United States: N. p., 2010. Web. doi:10.1088/2041-8205/718/2/L166.
Vandenbroucke, J., Buehler, R., Ajello, M., Bechtol, K., Bellini, A., Bolte, M., Cheung, C. C., Civano, F., Donato, D., Fuhrmann, L., Funk, S., Healey, S. E., Hill, A. B., Knigge, C., Madejski, G. M., Romani, R. W., Santander-García, M., Shaw, M. S., Steeghs, D., Torres, M. A. P., Van Etten, A., & Williams, K. A.. Discovery of a GeV blazar shining through the galactic plane. United States. doi:10.1088/2041-8205/718/2/L166.
Vandenbroucke, J., Buehler, R., Ajello, M., Bechtol, K., Bellini, A., Bolte, M., Cheung, C. C., Civano, F., Donato, D., Fuhrmann, L., Funk, S., Healey, S. E., Hill, A. B., Knigge, C., Madejski, G. M., Romani, R. W., Santander-García, M., Shaw, M. S., Steeghs, D., Torres, M. A. P., Van Etten, A., and Williams, K. A.. Wed . "Discovery of a GeV blazar shining through the galactic plane". United States. doi:10.1088/2041-8205/718/2/L166. https://www.osti.gov/servlets/purl/1357541.
@article{osti_1357541,
title = {Discovery of a GeV blazar shining through the galactic plane},
author = {Vandenbroucke, J. and Buehler, R. and Ajello, M. and Bechtol, K. and Bellini, A. and Bolte, M. and Cheung, C. C. and Civano, F. and Donato, D. and Fuhrmann, L. and Funk, S. and Healey, S. E. and Hill, A. B. and Knigge, C. and Madejski, G. M. and Romani, R. W. and Santander-García, M. and Shaw, M. S. and Steeghs, D. and Torres, M. A. P. and Van Etten, A. and Williams, K. A.},
abstractNote = {The Fermi Large Area Telescope (LAT) discovered a new gamma-ray source near the Galactic plane, Fermi J0109+6134, when it flared brightly in 2010 February. The low Galactic latitude (b = –1$ο\atop{.}$2) indicated that the source could be located within the Galaxy, which motivated rapid multi-wavelength follow-up including radio, optical, and X-ray observations. Here, we report the results of analyzing all 19 months of LAT data for the source, and of X-ray observations with both Swift and the Chandra X-ray Observatory. We determined the source redshift, z = 0.783, using a Keck Low-Resolution Imaging Spectrometer observation. Finally, we compiled a broadband spectral energy distribution (SED) from both historical and new observations contemporaneous with the 2010 February flare. The redshift, SED, optical line width, X-ray absorption, and multi-band variability indicate that this new GeV source is a blazar seen through the Galactic plane. Because several of the optical emission lines have equivalent width >5 Å, this blazar belongs in the flat-spectrum radio quasar category.},
doi = {10.1088/2041-8205/718/2/L166},
journal = {Astrophysical Journal Letters},
number = 2,
volume = 718,
place = {United States},
year = {2010},
month = {7}
}

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