The X-ray spectrum and spectral energy distribution of FIRST J155633.8+351758: a LoBAL quasar with a probable polar outflow

Cardinal Scholar

Show simple item record

dc.contributor.author Berrington, Robert C.
dc.contributor.author Brotherton, Michael S.
dc.contributor.author Gallagher, Sarah C.
dc.contributor.author Ganguly, Rajib
dc.contributor.author Shang, Zhaohouli
dc.contributor.author DiPompeo, Michael
dc.contributor.author Chatterjee, Ritaban
dc.contributor.author Lacy, Mark
dc.contributor.author Gregg, Michael D.
dc.contributor.author Hall, Patrick B.
dc.contributor.author Laurent-Muehleisen, S.A.
dc.date.accessioned 2020-01-23T15:26:55Z
dc.date.available 2020-01-23T15:26:55Z
dc.date.issued 10/23/2013
dc.identifier.citation Robert C. Berrington, Michael S. Brotherton, Sarah C. Gallagher, Rajib Ganguly, Zhaohui Shang, Michael DiPompeo, Ritaban Chatterjee, Mark Lacy, Michael D. Gregg, Patrick B. Hall, S. A. Laurent-Muehleisen, The X-ray spectrum and spectral energy distribution of FIRST J155633.8+351758: a LoBAL quasar with a probable polar outflow, Monthly Notices of the Royal Astronomical Society, Volume 436, Issue 4, 21 December 2013, Pages 3321–3330, https://doi.org/10.1093/mnras/stt1808 en_US
dc.identifier.uri http://cardinalscholar.bsu.edu/handle/123456789/202066
dc.description.abstract We report the results of a new 60 ks Chandra X-ray Observatory Advanced CCD Imaging Spectrometer S-array (ACIS-S) observation of the reddened, radio-selected, highly polarized ‘FeLoBAL’ quasar FIRST J1556+3517. We investigated a number of models of varied sophistication to fit the 531-photon spectrum. These models ranged from simple power laws to power laws absorbed by hydrogen gas in differing ionization states and degrees of partial covering. Preferred fits indicate that the intrinsic X-ray flux is consistent with that expected for quasars of similarly high luminosity, i.e. an intrinsic, dereddened and unabsorbed optical to X-ray spectral index of −1.7. We cannot tightly constrain the intrinsic X-ray power-law slope, but find indications that it is flat (photon index Γ = 1.7 or flatter at a >99 per cent confidence for a neutral hydrogen absorber model). Absorption is present, with a column density a few times 1023 cm−2, with both partially ionized models and partially covering neutral hydrogen models providing good fits. We present several lines of argument that suggest the fraction of X-ray emissions associated with the radio jet is not large. We combine our Chandra data with observations from the literature to construct the spectral energy distribution of FIRST J1556+3517 from radio to X-ray energies. We make corrections for Doppler beaming for the pole-on radio jet, optical dust reddening and X-ray absorption, in order to recover a probable intrinsic spectrum. The quasar FIRST J1556+3517 seems to be an intrinsically normal radio-quiet quasar with a reddened optical/UV spectrum, a Doppler-boosted but intrinsically weak radio jet and an X-ray absorber not dissimilar from that of other broad absorption line quasars. en_US
dc.format.mimetype application/pdf
dc.relation.isversionof https://doi.org/10.1093/mnras/stt1808 en_US
dc.rights This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2013 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
dc.subject quasars: absorption lines en_US
dc.subject quasars: general en_US
dc.subject quasars: individual (FIRST J155633.8+351758) en_US
dc.subject X-rays: galaxies en_US
dc.title The X-ray spectrum and spectral energy distribution of FIRST J155633.8+351758: a LoBAL quasar with a probable polar outflow en_US
dc.type Article en_US


Files in this item

This item appears in the following Collection(s)

Show simple item record

Search Cardinal Scholar


Browse

My Account