The first gamma-ray outburst of a narrow-line Seyfert 1 galaxy: The case of PMN J0948+0022 in 2010 July

Foschini, Luigi; Ghisellini, G.; Kovalev, Y. Y.; Lister, M. L.; D’Ammando, F.; Thompson, D. J.; Tramacere, A.; Angelakis, E.; Donato, D.; Falcone, A.; Fuhrmann, L.; Hauser, M.; Kovalev, Yu. A.; Mannheim, K.; Maraschi, L.; Max-Moerbeck, W.; Nestoras, I.; Pavlidou, V.; Pearson, T. J.; Pushkarev, A. B.; Readhead, A. C. S.; Richards, J. L.; Stevenson, M. A.; Tagliaferri, G.; Tibolla, O.; Tavecchio, F.; Wagner, S.

doi:10.1111/j.1365-2966.2011.18240.x

Title: The first gamma-ray outburst of a narrow-line Seyfert 1 galaxy: The case of PMN J0948+0022 in 2010 July

Abstract

We report on a multiwavelength campaign for the radio-loud narrow-line Seyfert 1 (NLS1) galaxy PMN J0948+0022 (z= 0.5846) performed in 2010 July–September and triggered by a high-energy γ-ray outburst observed by the Large Area Telescope onboard the Fermi Gamma-ray Space Telescope. The peak flux in the 0.1–100 GeV energy band exceeded, for the first time in this type of source, the value of ~10–6 photon cm–2 s–1, corresponding to an observed luminosity of ~1048 erg s–1. Although the source was too close to the Sun position to organize a densely sampled follow-up, it was possible to gather some multiwavelength data that confirmed the state of high activity across the sampled electromagnetic spectrum. Furthermore, the comparison of the spectral energy distribution of the NLS1 PMN J0948+0022 with that of a typical blazar – such as 3C 273 – shows that the power emitted at γ-rays is extreme.

Authors:

Foschini, Luigi ^[1]; Ghisellini, G. ^[1]; Kovalev, Y. Y. ^[2]; Lister, M. L. ^[3]; D’Ammando, F. ^[4]; Thompson, D. J. ^[5]; Tramacere, A. ^[6]; Angelakis, E. ^[7]; Donato, D. ^[8]; Falcone, A. ^[9]; Fuhrmann, L. ^[7]; Hauser, M. ^[10]; Kovalev, Yu. A. ^[11]; Mannheim, K. ^[12]; Maraschi, L. ^[1]; Max-Moerbeck, W. ^[13]; Nestoras, I. ^[7]; Pavlidou, V. ^[13]; Pearson, T. J. ^[13]; Pushkarev, A. B. ^[14] more »

INAF - Osservatorio Astronomico di Brera, Merate (LC) (Italy)
Astro Space Center of the Lebedev Physical Institute, Moscow (Russia); Max-Planck-Institut fur Radioastronomie, Bonn (Germany)
Purdue Univ., West Lafayette, IN (United States)
INAF - IASF-Palermo, Palermo (Italy)
NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)
ISDC Data Centre for Astrophysics, Versoix (Switzerland)
Max-Planck-Institut fur Radioastronomie, Bonn (Germany)
NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States); Univ. of Maryland, College Park, MD (United States)
Pennsylvania State Univ., University Park, PA (United States)
Univ. Heidelberg, Heidelberg (Germany)
Astro Space Center of the Lebedev Physical Institute, Moscow (Russia)
Univ. of Wurzburg, Wurzburg (Germany)
California Inst. of Technology (CalTech), Pasadena, CA (United States)
Max-Planck-Institut fur Radioastronomie, Bonn (Germany); Crimean Astrophysical Observatory, Crimea (Ukraine); Pulkovo Observatory, St. Petersburg (Russia)

Publication Date:: Wed May 11 00:00:00 EDT 2011

Research Org.:: SLAC National Accelerator Lab., Menlo Park, CA (United States)

Sponsoring Org.:: USDOE

OSTI Identifier:: 1357259

Grant/Contract Number:: AC02-76SF00515

Resource Type:: Accepted Manuscript

Journal Name:: Monthly Notices of the Royal Astronomical Society

Additional Journal Information:: Journal Volume: 413; Journal Issue: 3; Journal ID: ISSN 0035-8711

Publisher:: Royal Astronomical Society

Country of Publication:: United States

Language:: English

Subject:: 79 ASTRONOMY AND ASTROPHYSICS; galaxies: individual: PMN J0948+0022; galaxies: jets; galaxies: Seyfert

Citation Formats


                    Foschini, Luigi, Ghisellini, G., Kovalev, Y. Y., Lister, M. L., D’Ammando, F., Thompson, D. J., Tramacere, A., Angelakis, E., Donato, D., Falcone, A., Fuhrmann, L., Hauser, M., Kovalev, Yu. A., Mannheim, K., Maraschi, L., Max-Moerbeck, W., Nestoras, I., Pavlidou, V., Pearson, T. J., Pushkarev, A. B., Readhead, A. C. S., Richards, J. L., Stevenson, M. A., Tagliaferri, G., Tibolla, O., Tavecchio, F., and Wagner, S. The first gamma-ray outburst of a narrow-line Seyfert 1 galaxy: The case of PMN J0948+0022 in 2010 July.  United States: N. p., 2011. 
Web.  doi:10.1111/j.1365-2966.2011.18240.x.

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                    Foschini, Luigi, Ghisellini, G., Kovalev, Y. Y., Lister, M. L., D’Ammando, F., Thompson, D. J., Tramacere, A., Angelakis, E., Donato, D., Falcone, A., Fuhrmann, L., Hauser, M., Kovalev, Yu. A., Mannheim, K., Maraschi, L., Max-Moerbeck, W., Nestoras, I., Pavlidou, V., Pearson, T. J., Pushkarev, A. B., Readhead, A. C. S., Richards, J. L., Stevenson, M. A., Tagliaferri, G., Tibolla, O., Tavecchio, F., & Wagner, S. The first gamma-ray outburst of a narrow-line Seyfert 1 galaxy: The case of PMN J0948+0022 in 2010 July.  United States.  https://doi.org/10.1111/j.1365-2966.2011.18240.x

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                    Foschini, Luigi, Ghisellini, G., Kovalev, Y. Y., Lister, M. L., D’Ammando, F., Thompson, D. J., Tramacere, A., Angelakis, E., Donato, D., Falcone, A., Fuhrmann, L., Hauser, M., Kovalev, Yu. A., Mannheim, K., Maraschi, L., Max-Moerbeck, W., Nestoras, I., Pavlidou, V., Pearson, T. J., Pushkarev, A. B., Readhead, A. C. S., Richards, J. L., Stevenson, M. A., Tagliaferri, G., Tibolla, O., Tavecchio, F., and Wagner, S. Wed .  
"The first gamma-ray outburst of a narrow-line Seyfert 1 galaxy: The case of PMN J0948+0022 in 2010 July".  United States.  https://doi.org/10.1111/j.1365-2966.2011.18240.x.  https://www.osti.gov/servlets/purl/1357259.

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@article{osti_1357259,

  title        = {The first gamma-ray outburst of a narrow-line Seyfert 1 galaxy: The case of PMN J0948+0022 in 2010 July},

  author       = {Foschini, Luigi and Ghisellini, G. and Kovalev, Y. Y. and Lister, M. L. and D’Ammando, F. and Thompson, D. J. and Tramacere, A. and Angelakis, E. and Donato, D. and Falcone, A. and Fuhrmann, L. and Hauser, M. and Kovalev, Yu. A. and Mannheim, K. and Maraschi, L. and Max-Moerbeck, W. and Nestoras, I. and Pavlidou, V. and Pearson, T. J. and Pushkarev, A. B. and Readhead, A. C. S. and Richards, J. L. and Stevenson, M. A. and Tagliaferri, G. and Tibolla, O. and Tavecchio, F. and Wagner, S.},

  abstractNote = {We report on a multiwavelength campaign for the radio-loud narrow-line Seyfert 1 (NLS1) galaxy PMN J0948+0022 (z= 0.5846) performed in 2010 July–September and triggered by a high-energy γ-ray outburst observed by the Large Area Telescope onboard the Fermi Gamma-ray Space Telescope. The peak flux in the 0.1–100 GeV energy band exceeded, for the first time in this type of source, the value of ~10–6 photon cm–2 s–1, corresponding to an observed luminosity of ~1048 erg s–1. Although the source was too close to the Sun position to organize a densely sampled follow-up, it was possible to gather some multiwavelength data that confirmed the state of high activity across the sampled electromagnetic spectrum. Furthermore, the comparison of the spectral energy distribution of the NLS1 PMN J0948+0022 with that of a typical blazar – such as 3C 273 – shows that the power emitted at γ-rays is extreme.},

  doi          = {10.1111/j.1365-2966.2011.18240.x},

  journal      = {Monthly Notices of the Royal Astronomical Society},

  number       = 3,

  volume       = 413,

  place        = {United States},

  year         = {Wed May 11 00:00:00 EDT 2011},

  month        = {Wed May 11 00:00:00 EDT 2011}

}

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Following the recent discovery of gamma rays from the radio-loud narrow-line Seyfert 1 galaxy PMN J0948+0022 (z = 0.5846), we started a multiwavelength campaign from radio to gamma rays, which was carried out between the end of 2009 March and the beginning of July. The source displayed activity at all the observed wavelengths: a general decreasing trend from optical to gamma-ray frequencies was followed by an increase of radio emission after less than two months from the peak of the gamma-ray emission. The largest flux change, about a factor of about 4, occurred in the X-ray band. The smallest wasmore »« less
https://doi.org/10.1088/0004-637X/707/1/727
Fermi/Large Area Telescope Discovery of Gamma-Ray Emission from a Relativistic Jet in the Narrow-Line Quasar PMN J0948+0022

Journal Article Abdo, A. A. ; Ackermann, M. ; Ajello, M. ; ... - The Astrophysical Journal

In this paper, we report the discovery by the Large Area Telescope (LAT) onboard the Fermi Gamma-Ray Space Telescope of high-energy γ-ray emission from the peculiar quasar PMN J0948+0022 (z = 0.5846). The optical spectrum of this object exhibits rather narrow Hβ (FWHM(Hβ) ~1500 km s^–1), weak forbidden lines, and is therefore classified as a narrow-line type I quasar. This class of objects is thought to have relatively small black hole mass and to accrete at a high Eddington ratio. The radio loudness and variability of the compact radio core indicate the presence of a relativistic jet. Quasi-simultaneous radio/optical/X-ray andmore »« less
Cited by 146
https://doi.org/10.1088/0004-637X/699/2/976

Full Text Available
Radio-to-γ-ray monitoring of the narrow-line Seyfert 1 galaxy PMN J0948 + 0022 from 2008 to 2011

Journal Article Foschini, L. ; Angelakis, E. ; Fuhrmann, L. ; ... - Astronomy and Astrophysics

Here, we present more than three years of observations at different frequencies, from radio to high-energy γ-rays, of the Narrow-Line Seyfert 1 (NLS1) Galaxy PMN J0948 + 0022 (z = 0.585). This source is the first NLS1 detected at energies above 100 MeV and therefore can be considered the prototype of this emerging new class of γ-ray emitting active galactic nuclei (AGN). The observations performed from 2008 August 1 to 2011 December 31 confirmed that PMN J0948 + 0022 generates a powerful relativistic jet, which is able to develop an isotropic luminosity at γ-rays of the order of 10⁴⁸ ergmore »« less
Cited by 38
https://doi.org/10.1051/0004-6361/201220225

Full Text Available

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Title: The first gamma-ray outburst of a narrow-line Seyfert 1 galaxy: The case of PMN J0948+0022 in 2010 July

Abstract

Citation Formats

Radio-Loud Narrow-Line Seyfert 1 as a new Class of Gamma-Ray Active Galactic Nuclei journal, December 2009

FERMI /LARGE AREA TELESCOPE DISCOVERY OF GAMMA-RAY EMISSION FROM A RELATIVISTIC JET IN THE NARROW-LINE QUASAR PMN J0948+0022 journal, June 2009

Multiwavelength Monitoring of the Enigmatic Narrow-Line Seyfert 1 pmn J0948+0022 in 2009 March-July journal, November 2009

FERMI LARGE AREA TELESCOPE FIRST SOURCE CATALOG journal, May 2010

PKS 1502+106: A NEW AND DISTANT GAMMA-RAY BLAZAR IN OUTBURST DISCOVERED BY THE FERMI LARGE AREA TELESCOPE journal, January 2010

The colour of the narrow line Sy1-blazar 0324+3410 journal, August 2008

The γ-ray brightest days of the blazar 3C 454.3: The γ-ray brightest of 3C 454.3 journal, September 2010

An Evolutionary Scenario for Blazar Unification journal, January 2002

Parameter estimation in astronomy through application of the likelihood ratio journal, March 1979

Super-Eddington accretion rates in Narrow Line Seyfert 1 galaxies journal, October 2004

The Host Galaxies of Narrow-Line Seyfert 1 Galaxies: Nuclear Dust Morphology and Starburst Rings journal, June 2006

VLBI Observations of the Most Radio-Loud, Narrow-Line Quasar SDSS J094857.3 + 002225 journal, October 2006

Does the gamma-ray flux of the blazar 3C 454.3 vary on subhour time-scales?: Gamma-ray variability 3C 454.3 journal, August 2010

Canonical high-power blazars journal, August 2009

General physical properties of bright Fermi blazars: Properties of bright Fermi blazars journal, November 2009

A Panchromatic view of pks 0558–504: an Ideal Laboratory to Study the Disk-Jet link journal, June 2010

A Complete Sample of Soft X-Ray-selected AGNs. II. Statistical Analysis journal, April 2004

The Compact Radio Structure of Radio-Loud Narrow line Seyfert 1 Galaxies journal, May 2010

The Leiden/Argentine/Bonn (LAB) Survey of Galactic HI: Final data release of the combined LDS and IAR surveys with improved stray-radiation corrections journal, September 2005

FIVE-YEAR WILKINSON MICROWAVE ANISOTROPY PROBE OBSERVATIONS: COSMOLOGICAL INTERPRETATION journal, February 2009

Radio-loud Narrow-Line Type 1 Quasars journal, June 2006

Survey of instantaneous 1-22 GHz spectra of 550 compact extragalactic objects with declinations from $-30^\circ$ to $+43^\circ$ journal, November 1999

Mojave: Monitoring of jets in Active Galactic Nuclei with vlba Experiments. v. Multi-Epoch vlba Images journal, February 2009

The Likelihood Analysis of EGRET Data journal, April 1996

Narrow-line Seyfert 1s: 15 years later journal, September 2000

A Population of Radio‐Loud Narrow‐Line Seyfert 1 Galaxies with Blazar‐Like Properties? journal, October 2008

SDSS J094857.3+002225: A Very Radio Loud, Narrow‐Line Quasar with Relativistic Jets? journal, February 2003

A Comprehensive Study of 2000 Narrow Line Seyfert 1 Galaxies from the Sloan Digital Sky Survey. I. The Sample journal, September 2006

A Narrow-Line Seyfert 1-Blazar Composite Nucleus in 2MASX J0324+3410 journal, February 2007

Observatory science with eXTP journal, August 2018

Radio-to- γ -ray monitoring of the narrow-line Seyfert 1 galaxy PMN J0948 + 0022 from 2008 to 2011 journal, November 2012

Statistical multifrequency study of narrow-line Seyfert 1 galaxies journal, December 2014

What powers the radio-loud narrow-line Seyfert 1 galaxy RX J2314.9+2243?: A view onto its central engine from radio to X-rays⋆ journal, February 2015

Properties of flat-spectrum radio-loud narrow-line Seyfert 1 galaxies journal, February 2015

Fermi-LAT observation of nonblazar AGNs journal, June 2018

Radio-emitting narrow-line Seyfert 1 galaxies in the JVLA perspective journal, June 2018

Broadband X-ray observations of four gamma-ray narrow-line Seyfert 1 galaxies journal, December 2019

Intranight optical variability of -ray-loud narrow-line Seyfert 1 galaxies journal, November 2012

The ordinary life of the γ-ray emitting narrow-line Seyfert 1 galaxy PKS 1502+036 journal, June 2013

The most powerful flaring activity from the NLSy1 PMN J0948+0022 journal, November 2014

Prospects for gamma-ray observations of narrow-line Seyfert 1 galaxies with the Cherenkov Telescope Array journal, September 2018

Faint γ-ray sources at low redshift: the radio galaxy IC 1531 journal, September 2018

SDSS J211852.96−073227.5: a new γ-ray flaring narrow-line Seyfert 1 galaxy journal, April 2018

B2 0954+25A: a typical Fermi blazar or a γ-ray loud Narrow Line Seyfert 1≟: B2 0954+25A: a typical blazar or a γ-ray NLS1? journal, July 2012

SBS 0846+513: a new γ-ray-emitting narrow-line Seyfert 1 galaxy: SBS 0846+513: a new γ-ray-emitting NLS1 journal, September 2012

Gamma-ray Emitting Narrow-Line Seyfert 1 Galaxies: Past, Present, and Future text, January 2019

Relativistic Jets in Gamma-Ray-Emitting Narrow-Line Seyfert 1 Galaxies journal, November 2019

Relativistic Jets from AGN Viewed at Highest Angular Resolution journal, December 2019

Intermediate-line Emission in AGNs: The Effect of Prescription of the Gas Density journal, March 2018

General Physical Properties of Gamma-Ray-emitting Narrow-line Seyfert 1 Galaxies journal, February 2019

Gamma-ray emitting narrow-line Seyfert 1 galaxies: Past, present, and future journal, October 2019

The most powerful flaring activity from the NLSy1 PMN J0948+0022 text, January 2015

Gamma-Ray and Parsec-Scale Jet Properties of a Complete Sample of Blazars From the MOJAVE Program text, January 2011

Radio-to-gamma-ray Monitoring of the Narrow-Line Seyfert 1 Galaxy PMN J0948+0022 from 2008 to 2011 text, January 2012

The ordinary life of the gamma-ray emitting narrow-line Seyfert 1 galaxy PKS 1502+036 text, January 2013

Fermi-LAT Observation of Non-Blazar AGNs text, January 2018

Observatory science with eXTP text, January 2018

General Physical Properties of Gamma-ray Emitting Narrow-Line Seyfert 1 Galaxies text, January 2019

Radio-Loud Narrow-Line Seyfert 1 as a new Class of Gamma-Ray Active Galactic Nuclei
journal, December 2009

FERMI /LARGE AREA TELESCOPE DISCOVERY OF GAMMA-RAY EMISSION FROM A RELATIVISTIC JET IN THE NARROW-LINE QUASAR PMN J0948+0022
journal, June 2009

Multiwavelength Monitoring of the Enigmatic Narrow-Line Seyfert 1 pmn J0948+0022 in 2009 March-July
journal, November 2009

FERMI LARGE AREA TELESCOPE FIRST SOURCE CATALOG
journal, May 2010

PKS 1502+106: A NEW AND DISTANT GAMMA-RAY BLAZAR IN OUTBURST DISCOVERED BY THE FERMI LARGE AREA TELESCOPE
journal, January 2010

The colour of the narrow line Sy1-blazar 0324+3410
journal, August 2008

The γ-ray brightest days of the blazar 3C 454.3: The γ-ray brightest of 3C 454.3
journal, September 2010

An Evolutionary Scenario for Blazar Unification
journal, January 2002

Parameter estimation in astronomy through application of the likelihood ratio
journal, March 1979

Super-Eddington accretion rates in Narrow Line Seyfert 1 galaxies
journal, October 2004

The Host Galaxies of Narrow-Line Seyfert 1 Galaxies: Nuclear Dust Morphology and Starburst Rings
journal, June 2006

VLBI Observations of the Most Radio-Loud, Narrow-Line Quasar SDSS J094857.3 + 002225
journal, October 2006

Does the gamma-ray flux of the blazar 3C 454.3 vary on subhour time-scales?: Gamma-ray variability 3C 454.3
journal, August 2010

Canonical high-power blazars
journal, August 2009

General physical properties of bright Fermi blazars: Properties of bright Fermi blazars
journal, November 2009

A Panchromatic view of pks 0558–504: an Ideal Laboratory to Study the Disk-Jet link
journal, June 2010

A Complete Sample of Soft X-Ray-selected AGNs. II. Statistical Analysis
journal, April 2004

The Compact Radio Structure of Radio-Loud Narrow line Seyfert 1 Galaxies
journal, May 2010

The Leiden/Argentine/Bonn (LAB) Survey of Galactic HI: Final data release of the combined LDS and IAR surveys with improved stray-radiation corrections
journal, September 2005

FIVE-YEAR WILKINSON MICROWAVE ANISOTROPY PROBE OBSERVATIONS: COSMOLOGICAL INTERPRETATION
journal, February 2009

Radio-loud Narrow-Line Type 1 Quasars
journal, June 2006

Survey of instantaneous 1-22 GHz spectra of 550 compact extragalactic objects with declinations from $-30^\circ$ to $+43^\circ$
journal, November 1999

Mojave: Monitoring of jets in Active Galactic Nuclei with vlba Experiments. v. Multi-Epoch vlba Images
journal, February 2009

The Likelihood Analysis of EGRET Data
journal, April 1996

Narrow-line Seyfert 1s: 15 years later
journal, September 2000

A Population of Radio‐Loud Narrow‐Line Seyfert 1 Galaxies with Blazar‐Like Properties?
journal, October 2008

SDSS J094857.3+002225: A Very Radio Loud, Narrow‐Line Quasar with Relativistic Jets?
journal, February 2003

A Comprehensive Study of 2000 Narrow Line Seyfert 1 Galaxies from the Sloan Digital Sky Survey. I. The Sample
journal, September 2006

A Narrow-Line Seyfert 1-Blazar Composite Nucleus in 2MASX J0324+3410
journal, February 2007

Observatory science with eXTP
journal, August 2018

Radio-to- γ -ray monitoring of the narrow-line Seyfert 1 galaxy PMN J0948 + 0022 from 2008 to 2011
journal, November 2012

Statistical multifrequency study of narrow-line Seyfert 1 galaxies
journal, December 2014

What powers the radio-loud narrow-line Seyfert 1 galaxy RX J2314.9+2243?: A view onto its central engine from radio to X-rays⋆
journal, February 2015

Properties of flat-spectrum radio-loud narrow-line Seyfert 1 galaxies
journal, February 2015

Fermi-LAT observation of nonblazar AGNs
journal, June 2018

Radio-emitting narrow-line Seyfert 1 galaxies in the JVLA perspective
journal, June 2018

Broadband X-ray observations of four gamma-ray narrow-line Seyfert 1 galaxies
journal, December 2019

Intranight optical variability of -ray-loud narrow-line Seyfert 1 galaxies
journal, November 2012

The ordinary life of the γ-ray emitting narrow-line Seyfert 1 galaxy PKS 1502+036
journal, June 2013

The most powerful flaring activity from the NLSy1 PMN J0948+0022
journal, November 2014

Prospects for gamma-ray observations of narrow-line Seyfert 1 galaxies with the Cherenkov Telescope Array
journal, September 2018

Faint γ-ray sources at low redshift: the radio galaxy IC 1531
journal, September 2018

SDSS J211852.96−073227.5: a new γ-ray flaring narrow-line Seyfert 1 galaxy
journal, April 2018

B2 0954+25A: a typical Fermi blazar or a γ-ray loud Narrow Line Seyfert 1≟: B2 0954+25A: a typical blazar or a γ-ray NLS1?
journal, July 2012

SBS 0846+513: a new γ-ray-emitting narrow-line Seyfert 1 galaxy: SBS 0846+513: a new γ-ray-emitting NLS1
journal, September 2012

Gamma-ray Emitting Narrow-Line Seyfert 1 Galaxies: Past, Present, and Future
text, January 2019

Relativistic Jets in Gamma-Ray-Emitting Narrow-Line Seyfert 1 Galaxies
journal, November 2019

Relativistic Jets from AGN Viewed at Highest Angular Resolution
journal, December 2019

Intermediate-line Emission in AGNs: The Effect of Prescription of the Gas Density
journal, March 2018

General Physical Properties of Gamma-Ray-emitting Narrow-line Seyfert 1 Galaxies
journal, February 2019

Gamma-ray emitting narrow-line Seyfert 1 galaxies: Past, present, and future
journal, October 2019

The most powerful flaring activity from the NLSy1 PMN J0948+0022
text, January 2015

Gamma-Ray and Parsec-Scale Jet Properties of a Complete Sample of Blazars From the MOJAVE Program
text, January 2011

Radio-to-gamma-ray Monitoring of the Narrow-Line Seyfert 1 Galaxy PMN J0948+0022 from 2008 to 2011
text, January 2012

The ordinary life of the gamma-ray emitting narrow-line Seyfert 1 galaxy PKS 1502+036
text, January 2013

Fermi-LAT Observation of Non-Blazar AGNs
text, January 2018

Observatory science with eXTP
text, January 2018

General Physical Properties of Gamma-ray Emitting Narrow-Line Seyfert 1 Galaxies
text, January 2019