A Multiwavelength study of NLS1s galaxies from the Second Byurakan Survey

Abstract

In this work we present a multiwavelength study of narrow-line Seyfert 1 galaxies (NLS1s) discovered in the Second Byurakan Survey (SBS). The sample consists of 26 objects, which have $M_B\ge -23.0$, or $-19.9>M_B>-23.0$, $0.0243<z<0.317$ and $15.2<B<19.0$. For these objects, we present accurate coordinates, magnitudes, redshifts and the identification of optical objects with X-ray, IR and radio sources. Several galaxies are identified as X-ray or radio sources for the first time. We also report spectroscopic and photometric data, the spectral energy distribution, ${\alpha }_{ox}$ indices and other data. Our study shows that SBS NLS1s are strong or moderately strong soft X-ray sources with $\log L_x=42.8-45.4$. Soft X-ray luminous sources in our sample do not tend to be luminous in the infrared. All SBS NLS1s are radio quiet objects ($\log L_R<40.0$), and 52% of them are strong FeII emitters (FeII$\lambda 4570/H\beta >1$). The traditional linear correlation $L_x$ and $L_{op}$, which seems to hold for AGN in general, is found for SBS NLS1s. An anticorrelation between FWHM of $H\beta$ and the ratio of FeII$\lambda 4570/H\beta$ is also observed. A weak correlation is found between ${\alpha }_{ox}$ slope and $L_{op}$. One of our main findings is that almost all SBS NLS1s may not have a FIR bump. Their SED suggest that they may also possess a BBB. The absence of IR bump in most of SBS NLS1s and the weakness of X-ray radiation in some of them, may argue against the presence of a BLR. The surface density of SBS NLS1s is $<$ 0.015 per $deg{.}^2$ ($B<17.5,z<0.16$).

arXiv comment44 pages, 8 figures, published ApJ May 2003

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• Radio jet emission from GeV-emitting narrow-line Seyfert 1 galaxies
• The Unified Model of Active Galactic Nuclei: II. Evolutionary Connection
• On-axis spectroscopy of the host galaxies of 20 optically luminous quasars at z~0.3
• Very Long Baseline Array Imaging of Parsec-scale Radio Emissions in Nearby Radio-quiet Narrow-line Seyfert 1 Galaxies
• The Unified Model of Active Galactic Nuclei: I. Non-hidden Broad Line Region Seyfert 2 and Narrow Line Seyfert 1 Galaxies
• Very Long Baseline Array Imaging of Parsec-scale Jet Structures in Radio-loud Narrow-line Seyfert 1 Galaxies
• The X-ray afterglow of GRB030329
• The continuum and narrow line region of the NLS1 galaxy Mrk 766
• The optical emission line spectrum of Mark 110
• Exploring the physics of the accretion and jet in nearby narrow-line Seyfert 1 galaxies
• Compact and variable radio emission from an active galaxy with supersoft X-ray emission