%0 Generic %1 citeulike:13659138 %A Madsen, Kristin K. %A Fürst, Felix %A Walton, Dominic J. %A Harrison, Fiona A. %A Ballantyne, David R. %A Boggs, Steve E. %A Brenneman, Laura W. %A Christensen, Finn E. %A Craig, William W. %A Fabian, Andrew C. %A Forster, Karl %A Grefenstette, Brian W. %A Guainazzi, Matteo %A Hailey, Charles J. %A Madejski, Greg M. %A Matt, Giorgio %A Stern, Daniel %A Zhang, William W. %D 2015 %K imported %T 3C 273 with NuSTAR: Unveiling the AGN %U http://arxiv.org/abs/1506.06182 %X We present results from a 244 ks \$NuSTAR\$ observation of 3C 273, obtained during a cross-calibration campaign with the \$Chandra\$, \$INTEGRAL\$, \$Suzaku\$, \$Swift\$, and \$XMM-Newton\$ observatories. We show that the spectrum, when fit with a power-law model using data from all observatories except \$INTEGRAL\$ over the 1-78 keV band, leaves significant residuals in the \$NuSTAR\$ data between 30-78 keV. The \$NuSTAR\$ 3-78 keV spectrum is well-described by an exponentially cutoff power-law (\$\Gamma = 1.646 0.006\$, E\$\_cutoff = 202\_-34^+51\$ keV) with a weak reflection component from cold, dense material. There is also evidence for a weak (\$EW = 23 11\$ eV) neutral iron line. We interpret these features as arising from coronal emission plus reflection off an accretion disk or distant material. Beyond 80 keV \$INTEGRAL\$ data show clear excess flux relative to an extrapolation of the AGN model fit to \$NuSTAR\$. This high-energy power-law is consistent with the presence of a beamed jet, which begins to dominate over emission from the inner accretion flow at 30-40 keV. Modeling the jet as a power-law, we find the coronal component is fit by \$\Gamma\_AGN = 1.638 0.045\$, \$E\_cutfoff = 47 15\$ keV, and jet photon index by \$\Gamma\_jet = 1.05 0.4\$. We applied comptonizing coronal electron plasma models to place constraints on the plasma temperature and optical depth. Finally, we investigate the variability and find an inverse correlation between flux and \$\Gamma\$. We interpret this hardening of the spectrum with increasing flux to be due to the jet.

@misc{citeulike:13659138, abstract = {We present results from a 244 ks \$NuSTAR\$ observation of 3C 273, obtained during a cross-calibration campaign with the \$Chandra\$, \$INTEGRAL\$, \$Suzaku\$, \$Swift\$, and \$XMM-Newton\$ observatories. We show that the spectrum, when fit with a power-law model using data from all observatories except \$INTEGRAL\$ over the 1-78 keV band, leaves significant residuals in the \$NuSTAR\$ data between 30-78 keV. The \$NuSTAR\$ 3-78 keV spectrum is well-described by an exponentially cutoff power-law (\$\Gamma = 1.646 \pm 0.006\$, E\$\_\mathrm{cutoff} = 202\_{-34}^{+51}\$ keV) with a weak reflection component from cold, dense material. There is also evidence for a weak (\$EW = 23 \pm 11\$ eV) neutral iron line. We interpret these features as arising from coronal emission plus reflection off an accretion disk or distant material. Beyond 80 keV \$INTEGRAL\$ data show clear excess flux relative to an extrapolation of the AGN model fit to \$NuSTAR\$. This high-energy power-law is consistent with the presence of a beamed jet, which begins to dominate over emission from the inner accretion flow at 30-40 keV. Modeling the jet as a power-law, we find the coronal component is fit by \$\Gamma\_\mathrm{AGN} = 1.638 \pm 0.045\$, \$E\_\mathrm{cutfoff} = 47 \pm 15\$ keV, and jet photon index by \$\Gamma\_\mathrm{jet} = 1.05 \pm 0.4\$. We applied comptonizing coronal electron plasma models to place constraints on the plasma temperature and optical depth. Finally, we investigate the variability and find an inverse correlation between flux and \$\Gamma\$. We interpret this hardening of the spectrum with increasing flux to be due to the jet.}, added-at = {2019-03-25T08:20:55.000+0100}, archiveprefix = {arXiv}, author = {Madsen, Kristin K. and F\"{u}rst, Felix and Walton, Dominic J. and Harrison, Fiona A. and Ballantyne, David R. and Boggs, Steve E. and Brenneman, Laura W. and Christensen, Finn E. and Craig, William W. and Fabian, Andrew C. and Forster, Karl and Grefenstette, Brian W. and Guainazzi, Matteo and Hailey, Charles J. and Madejski, Greg M. and Matt, Giorgio and Stern, Daniel and Zhang, William W.}, biburl = {https://www.bibsonomy.org/bibtex/2e0a06e000c47653eaacf78cc6860697e/ericblackman}, citeulike-article-id = {13659138}, citeulike-linkout-0 = {http://arxiv.org/abs/1506.06182}, citeulike-linkout-1 = {http://arxiv.org/pdf/1506.06182}, day = 19, eprint = {1506.06182}, interhash = {50eecc899a1968ea0bebd62af95af053}, intrahash = {e0a06e000c47653eaacf78cc6860697e}, keywords = {imported}, month = jun, posted-at = {2015-06-29 04:11:08}, priority = {2}, timestamp = {2019-03-25T08:20:55.000+0100}, title = {{3C 273 with NuSTAR: Unveiling the AGN}}, url = {http://arxiv.org/abs/1506.06182}, year = 2015 }