The gamma-ray emitting radio-loud narrow-line Seyfert 1 galaxy PKS 2004−447

Simple item page
dc.contributor.authorKreikenbohm, A.
dc.contributor.authorSchulz, R.
dc.contributor.authorKadler, M.
dc.contributor.authorWilms, J.
dc.contributor.authorMarkowitz, A.
dc.contributor.authorChang, C. S.
dc.contributor.authorCarpenter, B.
dc.contributor.authorElsässer, D.
dc.contributor.authorGehrels, N.
dc.contributor.authorMannheim, K.
dc.contributor.authorMüller, C.
dc.contributor.authorOjha, R.
dc.contributor.authorRos, E.
dc.contributor.authorTrüstedt, J.
dc.date.accessioned2020-05-04T15:03:03Z
dc.date.available2020-05-04T15:03:03Z
dc.date.issued2015-12-23
dc.description.abstractAs part of the TANAMI multiwavelength progam, we discuss new X-ray observations of the γ-ray and radio-loud narrow line Seyfert 1 galaxy (γ-NLS1) PKS 2004−447. The active galaxy is a member of a small sample of radio-loud NLS1s detected in γ-rays by the Fermi Large Area Telescope. It stands out for being the radio-loudest and the 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. Supplemented by archival data from 2004 and 2011, our data set allows for a careful analysis of the X-ray spectrum and variability of this peculiar source. The (0.5–10) keV spectrum is described well by a power law (Γ ~ 1.6), 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. Correlated brightness variations in the (0.5–2) keV and (2–10) keV bands are explained by a single variable spectral component, such as the one from the jet. A possible soft excess seen in the data from 2004 cannot be confirmed by the new XMM-Newton observations taken during low-flux states. Any contribution to the total flux in 2004 is less than 20% of the power-law component. The (0.5–10) keV luminosities of PKS 2004−447 are in the range of (0.5−2.7) × 10⁴⁴ erg s⁻¹. A comparison of the X-ray properties among the known γ-NLS1 galaxies shows that in four out of five cases the X-ray spectrum is dominated by a flat power law without intrinsic absorption. These objects are moderately variable in their brightness, while spectral variability is observed in at least two sources. The major difference across the X-ray spectra of γ-NLS1s is the luminosity, which spans a range of almost two orders of magnitude from 10⁴⁴ erg s⁻¹ to 10⁴⁶ erg s⁻¹ in the (0.5–10) keV band.en_US
dc.description.sponsorshipWe acknowledge support by the Bundesministerium für Wirtschaft und Technologie through the Deutsches Zentrum für Luft- und Raumfahrt contract 50 OR 1303, the Deutsche Forschungsgemeinschaft under contract WI 1860/10-1, the Spanish MINECO projects AYA2009-13036-C02-02, AYA2012-38491-C02-01, and by the Generalitat Valenciana project PROMETEO/2009/104 and PROMETEOII/2014/057. E.R. and C.S.C. were partially supported by the MP0905 action “Black Holes in a Violent Universe”. C.S.C. was supported by the EU Framework 6 Marie Curie Early Stage Training program under contract number MEST-CT-2005-19669 “ESTRELA”. This research made use of a collection of ISIS scripts provided by the Dr. Karl Remeis observatory, Bamberg, Germany at http://www.sternwarte.uni-erlangen.de/isis/. This research was funded in part by NASA through Fermi Guest Investigator grants NNH10ZDA001N and NNH12ZDA001N (proposal numbers 41213 and 61089). This research was supported by an appointment to the NASA Postdoctoral Program at the Goddard Space Flight Center, administered by Oak Ridge Associated Universities through a contract with NASA. This research makes use of data obtained by XMM-Newton, an ESA science mission funded by ESA Member States and the USA (NASA), and Swift, a NASA mission with international participation.en_US
dc.description.urihttps://www.aanda.org/articles/aa/abs/2016/01/aa24818-14/aa24818-14.htmlen_US
dc.format.extent12 pagesen_US
dc.genrejournal articlesen_US
dc.identifierdoi:10.13016/m21gfv-oyez
dc.identifier.citationThe gamma-ray emitting radio-loud narrow-line Seyfert 1 galaxy PKS 2004−447 - I. The X-ray View A. Kreikenbohm, R. Schulz, M. Kadler, J. Wilms, A. Markowitz, C. S. Chang, B. Carpenter, D. Elsässer, N. Gehrels, K. Mannheim, C. Müller, R. Ojha, E. Ros and J. Trüstedt A&A, 585 (2016) A91 DOI: https://doi.org/10.1051/0004-6361/201424818en_US
dc.identifier.urihttps://doi.org/10.1051/0004-6361/201424818
dc.identifier.urihttp://hdl.handle.net/11603/18476
dc.identifier.urihttp://simbad.u-strasbg.fr/simbad/sim-ref?querymethod=bib&simbo=on&submit=submit+bibcode&bibcode=2016A%26A...585A..91K
dc.identifier.urihttps://ned.ipac.caltech.edu/cgi-bin/objsearch?search_type=Search&refcode=2016A%26A...585A..91K
dc.identifier.urihttps://ui.adsabs.harvard.edu/link_gateway/2016A%26A...585A..91K/XMM
dc.identifier.urihttps://heasarc.gsfc.nasa.gov/xamin/xamin.jsp?bibcode=2016A%26A%2E%2E%2E585A%2E%2E91K
dc.language.isoen_USen_US
dc.publisherEDP sciencesen_US
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC Physics Department Collection
dc.relation.ispartofUMBC Center for Space Sciences and Technology (CSST) / Center for Research and Exploration in Space Sciences & Technology II (CRSST II)
dc.relation.ispartofUMBC Faculty Collection
dc.rightsThis item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author.
dc.rightsPublic Domain Mark 1.0*
dc.rightsThis work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law
dc.rights.urihttp://creativecommons.org/publicdomain/mark/1.0/*
dc.titleThe gamma-ray emitting radio-loud narrow-line Seyfert 1 galaxy PKS 2004−447en_US
dc.typeTexten_US

Files

Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
aa24818-14.pdf
Size:
424.2 KB
Format:
Adobe Portable Document Format
Description:
Download
License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
2.56 KB
Format:
Item-specific license agreed upon to submission
Description:
Download

Collections

UMBC Physics Department
UMBC Center for Space Sciences and Technology (CSST) / Center for Research and Exploration in Space Sciences & Technology II (CRSST II)
UMBC Faculty Collection