0FGL J1830.3+0617: A FERMI BLAZAR NEAR THE GALACTIC PLANE
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Type of Work5 pages
journal articles preprints
Citation of Original PublicationN. Mirabal and J. P. Halpern, 0FGL J1830.3+0617: A FERMI BLAZAR NEAR THE GALACTIC PLANE, Astrophys.J.701:L129-L132,2009, doi: 10.1088/0004-637X/701/2/L129
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aas-2018.png iop-2016.png 0FGL J1830.3+0617: A FERMI BLAZAR NEAR THE GALACTIC PLANE N. Mirabal1,3 and J. P. Halpern2 Published 10 August 2009 • © 2009. The American Astronomical Society. All rights reserved. The Astrophysical Journal Letters, Volume 701, Number 2 DownloadArticle PDF Figures References 642 Total downloads 1818 total citations on Dimensions. Turn on MathJax Get permission to re-use this article Share this article Share this content via email Share on Facebook Share on Twitter Share on Google+ Share on Mendeley Article information Abstract We present a multiwavelength study of the unidentified Fermi γ-ray source 0FGL J1830.3+0617, which exhibits variability above 200 MeV on timescales of days to weeks. Within the Fermi 95% confidence error contour lies B1827+0617, a radio source with spectral index α = 0.09 between 1.4 and 4.85 GHz. The flat spectral index and flux density of 443 mJy at 4.85 GHz are consistent with the bulk of Fermi sources associated with blazars. It is also detected in the 0.3-10 keV band by Swift. Optical imaging in 2009 May identifies B1827+0617 at R ≈ 16.9, and shows that it is at least 2 mag brighter than on the Palomar Sky Survey plates. Contemporaneous optical spectroscopy acquired during this high state finds a weak emission line that we attribute to Mg II λ2798 at redshift z = 0.75, supporting a flat spectrum radio quasar classification. The variability characteristics and radio properties together indicate that 0FGL J1830.3+0617 at Galactic latitude b = +7.5 is a blazar. Blazar identifications of three additional low-latitude Fermi sources, 0FGL J0643.2+0858, 0FGL J1326.6 – 5302, and 0FGL J1328.8 – 5604, are also suggested.