High‐Energy Properties of PKS 1830−211

Zhang, Shu; Chen, Yupeng; Collmar, W.; Foschini, L.; Li, Ti-Pei; Torres, D. F.; Wang, Jian-Min

doi:10.1086/589498

Cited by 8 publications

(10 citation statements)

References 42 publications

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“…XMM-Newton observations of PKS 1830−211 were modeled by Foschini et al (2006) with a broken power-law model, with the photon index changing from ∼1.0 to ∼1.3 at about 3.5 keV. The joint fit of XMM/INTEGRAL data performed by Zhang et al (2008) confirmed that the broken power law is the best model fit, with column density, photon indices, and energy break parameters very similar to those found in the previously cited works.…”

Section: Swift Xrt Observationssupporting

confidence: 74%

“…As a first step we fit the average spectrum with the same model used for the single observations, obtaining an acceptable fit. Leaving the value of the column density of the 2003, COMPTEL (bowtie), and EGRET are taken from the literature (de Rosa et al 2005;Foschini et al 2006;Zhang et al 2008) and are plotted as light-gray open circles with a light-gray dashed-line model. All data are corrected for lensing for a factor of 10 magnification (although note that the magnification may not be the same for all frequencies; see Section 6.1).…”

Section: Swift Xrt Observationsmentioning

confidence: 99%

“…PKS 1830−211 is the brightest gravitational lens in the sky at centimeter wavelengths, hard X-ray, and MeV energies. Chandra, XMM-Newton, Swift BAT, and INTEGRAL have measured very hard spectra (Γ X ∼ 1) and high absorbing column densities accounting for a spectral break below ∼4 keV (de Rosa et al 2005;Foschini et al 2006;Zhang et al 2008).…”

Section: Introductionmentioning

confidence: 99%

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GAMMA-RAY FLARING ACTIVITY FROM THE GRAVITATIONALLY LENSED BLAZAR PKS 1830–211 OBSERVED BYFermiLAT

Abdo

Ackermann

Ajello

et al. 2015

ApJ

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The Large Area Telescope (LAT) on board the Fermi Gamma-ray Space Telescope routinely detects the MeV-peaked flat-spectrum radio quasar PKS 1830−211 (z = 2.507). Its apparent isotropic γ-ray luminosity (E > 100 MeV), averaged over ∼3 years of observations and peaking on 2010 October 14/15 at 2.9 × 10 50 erg s −1 , makes it among the brightest high-redshift Fermi blazars. No published model with a single lens can account for all of the observed characteristics of this complex system. Based on radio observations, one expects time-delayed variability to follow about 25 days after a primary flare, with flux about a factor of 1.5 less. Two large γ-ray flares of PKS 1830−211 have been detected by the LAT in the considered period, and no substantial evidence for such a delayed activity was found. This allows us to place a lower limit of about 6 on the γ-ray flux ratio between the two lensed images. Swift XRT observations from a dedicated Target of Opportunity program indicate a hard spectrum with no significant correlation of X-ray flux with the γ-ray variability. The spectral energy distribution can be modeled with inverse Compton scattering of thermal photons from the dusty torus. The implications of the LAT data in terms of variability, the lack of evident delayed flare events, and different radio and γ-ray flux ratios are discussed. Microlensing effects, absorption, size and location of the emitting regions, the complex mass distribution of the system, an energy-dependent inner structure of the source, and flux suppression by the lens galaxy for one image path may be considered as hypotheses for understanding our results.

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Section: Swift Xrt Observationssupporting

confidence: 74%

Section: Swift Xrt Observationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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GAMMA-RAY FLARING ACTIVITY FROM THE GRAVITATIONALLY LENSED BLAZAR PKS 1830–211 OBSERVED BYFermiLAT

Abdo

Ackermann

Ajello

et al. 2015

ApJ

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“…PKS 1830–211 is a gravitationally lensed galaxy and the excess absorption can be attributed to the intervening galaxy at z = 0.89. The best fit of the observed spectrum requires both an absorber and a broken power law (model D), confirming the results reported by Zhang et al (2008) with three XMM–Newton observations (Obs. IDs 0204580201, 0204580301 and 0204580401) 6 and the INTEGRAL average data (up to 2006 April 29).…”

Section: Broad‐band Spectral Analysissupporting

confidence: 86%

An X-ray view of the INTEGRAL/IBIS blazars

Gianni

Rosa

Bassani³

et al. 2011

Monthly Notices of the Royal Astronomical Society

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Aim of this work is a broad-band study with INTEGRAL, Swift and XMM-Newton satellites of a sample of 9 blazars (7 FSRQ and 2 BL Lac) with redshift up to about 4. The spectral analysis has shown clear evidence of a flattening of the continuum towards the low energies ($E<3$ keV observer frame). This behaviour is well reproduced both with an absorbed power-law model ($N_H\sim10^{20}$-$10^{23}$ cm$^{-2}$ in the rest-frame of the sources) or a broken power-law continuum model (with an energy break below 3 keV in the observer-frame). No Compton reflection features, Fe $K\alpha$ line and hump at high energies, have been detected, with the exception of the source IGR J22517+2218 that shows the presence of a weak iron line. In this work we also investigate a possible correlation between the absorption column density $N_H$ and the red-shift. We confirm the existence of a $N_H$-z trend, with the higher absorption at z$>$2 for a larger sample compared to previous results. The distribution of the $N_H$ and the photon index $\Gamma$ is also presented. The hard X-ray data allow us to detect highly absorbed sources (with $N_H\ge10^{23}$cm$^{-2}$ in rest-frame of the source) characterized by photon index distribution peaked at harder values ($\Gamma\sim1.4$) with respect to that obtained with XMM data only ($\Gamma\sim2$).Comment: accepted for publication in MNRA

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“…The most important additional source is the "nearby" quasar PKS 1830-210 at l/b=∼12.2 • /-5.7 • , which is also a known COMPTEL source (e.g. Zhang et al, 2008). The inclusion of two further MeV source, one at the Galactic Center, the other one being the COMPTEL detected blazar PKS 1622-297 (Zhang et al, 2002) showed no influence on the derived source fluxes of GRO J1823-12.…”

Section: Instrument and Data Analysismentioning

confidence: 91%

LS 5039 – the counterpart of the unidentified MeV source GRO J1823-12

Collmar

Zhang

2014

A&A

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Context. The COMPTEL experiment on CGRO observed the γ-ray sky at energies from 0.75 MeV to 30 MeV between April 1991 and June 2000. COMPTEL detected many γ-ray sources, among them an unidentified one labeled GRO J1823-12. It is located near l/b=17.5 • /-0.5 • and positionally consistent with the prominent γ-ray binary LS 5039. Aims. LS 5039 was established as a γ-ray source at TeV energies by HESS and at GeV energies by Fermi/LAT during recent years, whose γ-ray radiation is modulated along its binary orbit. Given this new information we reanalysed the COMPTEL data of GRO J1823-12 including an orbital resolved analysis. Methods. We applied the standard methods, proper event selections and data binning with subsequent maximum-likelihood deconvolution, to analyse the COMPTEL data. In addition we developed a tool to select and bin the COMPTEL data in a phase-resolved manner. We present the orbit-averaged as well as orbit-resolved MeV analyses, lightcurves and spectra, and put them into multifrequency context. Results. The COMPTEL data show a significant MeV source, which is positionally consistent with LS 5039, however also with other closeby Fermi/LAT sources. The orbit-resolved analysis provides strong evidence, at about the 3σ level, that the MeV flux of GRO J1823-12 is modulated along the binary orbit of about 3.9 days of LS 5039. We show that at MeV energies the source is brighter at the orbital part around the inferior conjuction than at the part of the superior conjunction, being in phase with X-rays and TeV γ-rays, however being in anti-phase with GeV γ-rays. The high-energy SED (X-rays to TeV γ-rays) shows the high-energy emission maximum of LS 5039 at MeV energies. Conclusions. We conclude that the COMPTEL source GRO J1823-12 is the counterpart of the microquasar LS 5039, at least for the majority of its MeV emission. The COMPTEL fluxes, put into multifrequency perspective, provide new constraints on the modelling of the high-energy emission pattern of the γ-ray binary LS 5039.

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High‐Energy Properties of PKS 1830−211

Cited by 8 publications

References 42 publications

GAMMA-RAY FLARING ACTIVITY FROM THE GRAVITATIONALLY LENSED BLAZAR PKS 1830–211 OBSERVED BYFermiLAT

GAMMA-RAY FLARING ACTIVITY FROM THE GRAVITATIONALLY LENSED BLAZAR PKS 1830–211 OBSERVED BYFermiLAT

An X-ray view of the INTEGRAL/IBIS blazars

LS 5039 – the counterpart of the unidentified MeV source GRO J1823-12

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