Prospects for gamma-ray observations of narrow-line Seyfert 1 galaxies with the Cherenkov Telescope Array II. Gamma-gamma absorption in the broad-line region radiation fields

Abstract

Gamma-ray emitting narrow-line Seyfert 1 ($\gamma$-NLS1) galaxies possibly harbour relatively low-mass black holes (10${}^6$-10${}^8$ M${}_{\odot }$) accreting close to the Eddington limit, and share many characteristics with their sibling sources, flat-spectrum radio quasars. Although they have been detected in the MeV--GeV band with Fermi-LAT, they have never been seen in the very high energy band with current imaging atmospheric Cherenkov telescopes (IACTs). Thus, they are key targets for the next-generation IACT, the Cherenkov Telescope Array (CTA). In a previous work we selected, by means of extensive simulations, the best candidates for a prospective CTA detection (SBS 0846$+$513, PMN J0948$+$0022, and PKS 1502$+$036) taking into account the effects of both the intrinsic absorption (approximated with a cut-off at 30 GeV), and the extra-galactic background light on the propagation of $\gamma$-rays. In this work we simulate the spectra of these three sources by adopting more realistic broad-line region (BLR) absorption models. In particular, we consider the detailed treatment of $\gamma$-$\gamma$ absorption in the radiation fields of the BLR as a function of the location of the $\gamma$-ray emission region with parameters inferred from observational constraints. We find that, due to the energy range extent and its sensitivity, CTA is particularly well suited to locate the $\gamma$-ray emitting region in $\gamma$-NLS1. In particular CTA will be able not only to distinguish whether the $\gamma$-ray emitting region is located inside or outside the BLR, but also where inside the BLR it may be.

arXiv commentAccepted for publication in Monthly Notices of the Royal Astronomical Society. 15 pages, 8 figures, 7 tables

References in corpus (49)

• Central Masses and Broad-Line Region Sizes of Active Galactic Nuclei. II. A Homogeneous Analysis of a Large Reverberation-Mapping Database
• Fermi Large Area Telescope Fourth Source Catalog
• The Low-Luminosity End of the Radius-Luminosity Relationship for Active Galactic Nuclei
• Leptonic and Hadronic Modeling of Fermi-Detected Blazars
• Extragalactic Background Light Inferred from AEGIS Galaxy SED-type Fractions
• General physical properties of bright Fermi blazars
• Very-High-Energy Gamma Rays from a Distant Quasar: How Transparent Is the Universe?
• MAGIC discovery of VHE Emission from the FSRQ PKS 1222+21
• Radio-loud Narrow-Line Type 1 Quasars
• The blazar sequence: a new perspective
• A Population of Radio-loud Narrow Line Seyfert 1 Galaxies with Blazar-like Properties?
• Minute-Timescale >100 MeV gamma-ray variability during the giant outburst of quasar 3C 279 observed by Fermi-LAT in 2015 June
• Science with the Cherenkov Telescope Array
• Fermi/LAT discovery of gamma-ray emission from a relativistic jet in the narrow-line quasar PMN J0948+0022
• Properties of flat-spectrum radio-loud Narrow-Line Seyfert 1 Galaxies
• On the Location of the Gamma-ray Emission in the 2008 Outburst in the BL Lacertae Object AO 0235+164 through Observations across the Electromagnetic Spectrum
• Very-high-energy gamma-rays from the Universe's middle age: detection of the z=0.940 blazar PKS 1441+25 with MAGIC
• A spectroscopic analysis of a sample of narrow-line Seyfert 1 galaxies selected from the Sloan Digital Sky Survey
• Multiwavelength monitoring of the enigmatic Narrow-Line Seyfert 1 PMN J0948+0022 in March-July 2009
• H.E.S.S. discovery of VHE gamma-rays from the quasar PKS 1510-089
• Gamma rays from the quasar PKS 1441+25: story of an escape
• Radiation fields of disk, BLR and torus in quasars and blazars: implications for gamma-ray absorption
• An adaptive-binning method for generating constant-uncertainty/constant-significance light curves with Fermi-LAT data
• GammaLib and ctools: A software framework for the analysis of astronomical gamma-ray data
• The first gamma-ray outburst of a Narrow-Line Seyfert 1 Galaxy: the case of PMN J0948+0022 in July 2010
• A Very Radio-Loud Narrow-Line Seyfert 1: PKS 2004-447
• The redshift-dependence of gamma-ray absorption in the environments of strong-line AGN
• Flux upper limits for 47 AGN observed with H.E.S.S. in 2004-2011
• Gamma-Gamma Absorption in the Broad Line Region Radiation Fields of Gamma-Ray Blazars
• Intrinsic absorption in 3C 279 at GeV-TeV energies and consequences for estimates of the EBL
• Compact steep-spectrum sources as the parent population of flat-spectrum radio-loud NLS1s
• Exploring the blazar zone in High Energy flares of FSRQs
• Monte Carlo Performance Studies for the Site Selection of the Cherenkov Telescope Array
• The red blazar PMN J2345-1555 becomes blue
• The most powerful flaring activity from the NLSy1 PMN J0948+0022
• 37 GHz observations of narrow-line Seyfert 1 galaxies
• Constraints on the emission region of 3C 279 during strong flares in 2014 and 2015 through VHE gamma-ray observations with H.E.S.S
• Blazar nuclei in radio-loud narrow-line Seyfert 1?
• Absorption of 10 Gev--1 Tev Gamma Rays by Radiation from Broad-Line Region in 3C 279
• Modification of the gamma-ray spectra by internal absorption in OVV blazars: The example cases of 3C 273 and 3C 279
• PKS 1510-089: a rare example of a flat spectrum radio quasar with a very high-energy emission
• A Search for TeV Gamma-Ray Emission from High-Peaked Flat Spectrum Radio Quasars Using the Whipple Air-Cherenkov Telescope
• Prospects for gamma-ray observations of narrow-line Seyfert 1 galaxies with the Cherenkov Telescope Array
• Infrared to X-ray observations of PKS 2155-304 in a low state
• The awakening of the gamma-ray narrow-Line Seyfert 1 galaxy PKS 1502+036
• H.E.S.S. detection of very-high-energy gamma-ray emission from the quasar PKS 0736+017
• Broadband Observations of the Gamma-ray Emitting Narrow Line Seyfert 1 Galaxy SBS 0846+513
• Are Narrow Line Seyfert 1 Galaxies powered by low mass black holes?
• H.E.S.S. discovery of very-high-energy emission from the blazar PKS 0736+017: on the location of the $\gamma$-ray emitting region in FSRQs

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• ASTRI Mini-Array Core Science at the Observatorio del Teide
• Galactic Observatory Science with the ASTRI Mini-Array at the Observatorio del Teide
• Modelling the variable emission states of $\gamma$-ray emitting Narrow-Line Seyfert 1 galaxies
• Hunting for the nature of the enigmatic narrow-line Seyfert 1 galaxy PKS 2004-447
• High-energy and Very High-energy Constraints from Log-parabolic Spectral Models in Narrow-line Seyfert 1 Galaxies
• Modeling Cosmological Evolution of Jetted Seyfert Galaxies for z<10