The broad-band spectrum of the narrow-line Seyfert 1 NGC 4748: from UV to hard X-ray
Sign Up to like & getrecommendations! Published in 2018 at "Astrophysics and Space Science"
DOI: 10.1007/s10509-018-3447-2
Abstract: We report the results obtained by a broad-band (0.5–500 keV) data analysis of narrow-line Seyfert 1 galaxy NGC 4748 observed with an XMM-Newton/PN, INTEGRAL/ISGRI and SWIFT/BAT telescopes. This galaxy has a soft X-ray excess that… read more here.
Keywords: narrow line; ngc 4748; model; line seyfert ... See more keywords
Gamma-ray emitting narrow-line Seyfert 1 galaxies: Past, present, and future
Sign Up to like & getrecommendations! Published in 2019 at "Journal of Astrophysics and Astronomy"
DOI: 10.1007/s12036-019-9604-3
Abstract: This article reviews our current understanding about $\gamma$-ray detected narrow-line Seyfert 1 ($\gamma$-NLSy1) galaxies. The detection with the Large Area Telescope onboard {\it Fermi}~Gamma-ray Space Telescope has provided the strongest evidence for the presence of… read more here.
Keywords: line seyfert; narrow line; gamma ray; gamma ... See more keywords
Spectro-timing analysis of a highly variable narrow-line Seyfert 1 galaxy NGC 4748 with AstroSat and XMM-Newton
Sign Up to like & getrecommendations! Published in 2021 at "Journal of Astrophysics and Astronomy"
DOI: 10.1007/s12036-021-09719-1
Abstract: We present a detailed timing and spectral study of an extremely variable narrow-line Seyfert 1 galaxy NGC 4748 using observations in the year 2017 and 2014 performed with AstroSat and XMM-Newton , respectively. Both observations show extremely… read more here.
Keywords: galaxy ngc; line; variable narrow; seyfert galaxy ... See more keywords
Solid-Effect Dynamic Nuclear Polarization in Viscous Liquids at 9.4 T Using Narrow-Line Polarizing Agents.
Sign Up to like & getrecommendations! Published in 2023 at "Journal of the American Chemical Society"
DOI: 10.1021/jacs.3c01358
Abstract: Dynamic nuclear polarization (DNP) is a hyperpolarization method that is widely used for increasing the sensitivity of nuclear magnetic resonance (NMR) experiments. DNP is efficient in solid-state and liquid-state NMR, but its implementation in the… read more here.
Keywords: nuclear polarization; line polarizing; narrow line; using narrow ... See more keywords
Probing narrow-line Seyfert 1 galaxies in the southern hemisphere
Sign Up to like & getrecommendations! Published in 2018 at "Astronomy and Astrophysics"
DOI: 10.1051/0004-6361/201832678
Abstract: We present a new accurate catalog of narrow-line Seyfert 1 galaxies (NLS1s) in the southern hemisphere from the Six-degree Field Galaxy Survey (6dFGS) final data release, which is currently the most extensive spectroscopic survey available… read more here.
Keywords: probing narrow; seyfert galaxies; southern hemisphere; line seyfert ... See more keywords
Broadband X-ray observations of four gamma-ray narrow-line Seyfert 1 galaxies
Sign Up to like & getrecommendations! Published in 2019 at "Astronomy and Astrophysics"
DOI: 10.1051/0004-6361/201935929
Abstract: Narrow-line Seyfert 1 galaxies (NLS1s) is one of the few classes of active galactic nuclei (AGN) harboring powerful relativistic jets and detected in $\gamma$ rays. NLS1s are well-known X-ray sources. While in non-jetted sources the… read more here.
Keywords: narrow line; line; seyfert galaxies; line seyfert ... See more keywords
Detection of a variable ultrafast outflow in the narrow-line Seyfert 1 galaxy PG 1448+273
Sign Up to like & getrecommendations! Published in 2020 at "Monthly Notices of the Royal Astronomical Society"
DOI: 10.1093/mnras/staa1425
Abstract: Relativistically blueshifted absorption features of highly ionised ions, the so-called ultra-fast outflows (UFOs), have been detected in the X-ray spectra of a number of accreting supermassive black holes. If these features truly originate from accretion… read more here.
Keywords: detection; 1448 273; seyfert galaxy; line seyfert ... See more keywords
Gamma-ray-emitting narrow-line Seyfert 1 galaxies: the Swift view
Sign Up to like & getrecommendations! Published in 2020 at "Monthly Notices of the Royal Astronomical Society"
DOI: 10.1093/mnras/staa1580
Abstract: We report the analysis of all Swift observations available up to 2019 April of $\gamma$-ray-emitting narrow-line Seyfert 1 galaxies (NLSy1). The distribution of X-ray luminosities (and fluxes) indicates that the jet radiation significantly contributes to… read more here.
Keywords: gamma ray; narrow line; ray emitting; jet ... See more keywords
A Suzaku sample of unabsorbed narrow-line and broad-line Seyfert 1 galaxies – I. X-ray spectral properties
Sign Up to like & getrecommendations! Published in 2020 at "Monthly Notices of the Royal Astronomical Society"
DOI: 10.1093/mnras/staa2783
Abstract: A sample of narrow-line (NLS1) and broad-line Seyfert 1 (BLS1) galaxies observed with Suzaku is presented. The final sample consists of 22 NLS1s and 47 BLS1s, for a total of 69 AGN that are all… read more here.
Keywords: soft hard; line; hard excesses; line seyfert ... See more keywords
The radio structure of the narrow-line Seyfert 1 Mrk 783 with VLBA and e-MERLIN
Sign Up to like & getrecommendations! Published in 2020 at "Monthly Notices of the Royal Astronomical Society"
DOI: 10.1093/mnras/staa3024
Abstract: In this paper, we present the analysis of new radio and optical observations of the narrow-line Seyfert 1 galaxy Mrk 783. 1.6 GHz observations performed with the e-MERLIN interferometer confirm the presence of the diffuse… read more here.
Keywords: mrk 783; radio; radio structure; line seyfert ... See more keywords
Comparative intranight optical variability of X-ray and γ-ray-detected narrow-line Seyfert 1 galaxies
Sign Up to like & getrecommendations! Published in 2020 at "Monthly Notices of the Royal Astronomical Society"
DOI: 10.1093/mnras/staa408
Abstract: In a systematic program to characterize the intranight optical variability (INOV) of different classes of narrow-line Seyfert 1 (NLSy1s) galaxies, we report here the first comparative INOV study of NLSy1 sets detected in the X-ray… read more here.
Keywords: optical variability; narrow line; ray; per cent ... See more keywords