The Gamma-Ray Emitting Radio-Loud Narrow-Line Seyfert 1 Galaxy PKS 2004-447 I. The X-Ray View
Annika Kreikenbohm, Robert Schulz, Matthias Kadler, J\"orn Wilms, Alex, Markowitz, Chin Shin Chang, Bryce Carpenter, Dominik Els\"asser, Neil, Gehrels, Karl Mannheim, Cornelia M\"uller, Roopesh Ojha, Eduardo Ros, Jonas, Tr\"ustedt

TL;DR
This study presents X-ray observations of the gamma-ray and radio-loud Narrow-Line Seyfert 1 galaxy PKS 2004-447, revealing a flat spectrum dominated by jet emission, variability over months and years, and insights into its X-ray properties compared to similar galaxies.
Contribution
First detailed X-ray monitoring of PKS 2004-447, showing jet-dominated emission and variability, expanding understanding of gamma-ray NLS1 galaxies.
Findings
X-ray spectrum is a flat power law indicating jet emission.
Moderate flux variability observed over months and years.
X-ray luminosity ranges from 0.5 to 2.7 x 10^{44} erg/s.
Abstract
As part of the TANAMI multiwavelength progam, we discuss new X-ray observations of the -ray and radio-loud Narrow Line Seyfert galaxy (-NLS1) PKS 2004-447. The active galaxy is a member of a small sample of radio-loud NLS1s detected in -rays by the Fermi Large Area Telescope. It is the radio-loudest and only southern-hemisphere source in this sample. We present results from our X-ray monitoring program comprised of Swift snapshot observations from 2012 through 2014 and two new X-ray observations with XMM-Newton in 2012. We analyze the X-ray spectrum and variability of this peculiar source using supplementary archival data from 2004 and 2011. The (0.5-10) keV spectrum is well described by a flat power law, which can be interpreted as non-thermal emission from a relativistic jet. The source exhibits moderate flux variability on timescales of both months and years.…
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