scholarly journals Metallicity and black hole masses of z≃6 quasars

2006 ◽  
Vol 2 (14) ◽  
pp. 257-257
Author(s):  
Jaron D. Kurk ◽  
Fabian Walter ◽  
Dominik Riechers ◽  
Hans-Walter Rix ◽  
Stefan Wagner ◽  
...  
Keyword(s):  
Black Hole ◽  
Nir Spectroscopy ◽  
Emission Lines ◽  
Line Widths ◽  
Black Hole Masses

AbstractWe present NIR spectroscopy of emission lines of a sample of five z≃6 quasars, including fainter objects than observed before. The measured FeII/MgII ratios are around solar and consistent with a lack of evolution of the metallicity of quasar BLRs up to z≃6, suggesting that stars in their hosts formed at z≫6. The BH masses, measured from both MgII and CIV line widths are within the range 2-16×108M⊙, the smallest found in such distant objects.

scholarly journals Measuring Supermassive Black Hole Masses: Correlation between the Redshifts of the Fe iii UV Lines and the Widths of Broad Emission Lines

2019 ◽  
Vol 880 (2) ◽  
pp. 96 ◽  
Author(s):  
E. Mediavilla ◽  
J. Jiménez-vicente ◽  
J. Mejía-restrepo ◽  
V. Motta ◽  
E. Falco ◽  
...  
Keyword(s):  
Black Hole ◽  
Emission Lines ◽  
Supermassive Black Hole ◽  
Broad Emission ◽  
Black Hole Masses

scholarly journals Black Hole Masses of Active Galaxies with Double‐peaked Balmer Emission Lines

2006 ◽  
Vol 642 (2) ◽  
pp. 711-719 ◽  
Author(s):  
Karen T. Lewis ◽  
Michael Eracleous
Keyword(s):  
Black Hole ◽  
Active Galaxies ◽  
Emission Lines ◽  
Black Hole Masses

scholarly journals SWIFT/BAT AGN2 reveal broad emission lines in the NIR: the first virial measure of their black hole masses

2015 ◽  
Author(s):  
Francesca Onori ◽  
Fabio La Franca ◽  
Federica Ricci ◽  
Marcella Brusa ◽  
Eleonora Sani ◽  
...  
Keyword(s):  
Black Hole ◽  
Emission Lines ◽  
Broad Emission ◽  
Black Hole Masses

Radio galaxies with and without emission lines

2020 ◽  
Vol 15 (S359) ◽  
pp. 396-401
Author(s):  
Grażyna Stasińska ◽  
Natalia Vale Asari ◽  
Dorota Kozieł-Wierzbowska
Keyword(s):  
Black Hole ◽  
Active Galactic Nuclei ◽  
Equivalent Width ◽  
Galactic Nuclei ◽  
Optical Emission ◽  
Radio Galaxies ◽  
Emission Lines ◽  
The Common ◽  
Black Hole Masses

AbstractUsing the recent ROGUE I catalogue of galaxies with radio cores (Kozie_l-Wierzbowska et al. 2020) and after selecting the objects which are truly radio active galactic nuclei, AGNs, (which more than doubles the samples available so far), we perform a thorough comparison of the properties of radio galaxies with and without optical emission lines (galaxies where the equivalent width of Hα is smaller than 3Å are placed in the last category). We do not find any strong dichotomy between the two classes as regards the radio luminosities or black hole masses. The same is true when using the common classification into high- and low-excitation radio galaxies (HERGs and LERGs respectively).

scholarly journals Black hole masses from emission‐line widths

2021 ◽  
Author(s):  
Elena Dalla Bontà ◽  
Bradley M. Peterson
Keyword(s):  
Black Hole ◽  
Emission Line ◽  
Line Widths ◽  
Black Hole Masses

Properties of AGN in NIR within the context of the Eigenvector 1

2019 ◽  
Vol 15 (S359) ◽  
pp. 460-461
Author(s):  
D. Dias dos Santos ◽  
A. Rodríguez-Ardila ◽  
M. Marinello
Keyword(s):  
Large Range ◽  
Outer Region ◽  
Nir Spectroscopy ◽  
Emission Lines ◽  
Continuum Emission ◽  
Type I ◽  
Sublimation Temperature ◽  
Line Widths ◽  
Ongoing Project ◽  
The Continuum

AbstractWe present a spectral atlas of 70 type-I AGN with the wavelength ranging 0.4–2.5 μm. For 37 sources, this is the first report of NIR spectroscopy in literature. The sample was constructed to study narrow line Seyfert 1 and quasars, with a large range of line widths (800 km s−1 < FWHM < 4000 km s−1) and Fe II intensities (0.2 < R4570 < 2.8). This work presents partial results of an ongoing project that has the objective of modeling the continuum emission and emission lines in order to derive the physics driven the Eigenvector 1 through a panchromatic spectral analysis, with emphasis on strong to super-strong Fe ii emitters. Our results show that hot dust near the sublimation temperature is necessary to explain the 1μm break of the power law component of the continuum. We estimated the hot dust mass and found a weak or absent correlation with the Fe II intensity. Moreover, we found that low ionisation ions are formed in an outer region of the BLR.

scholarly journals Near-infrared emission lines trace the state-independent accretion disc wind of the black hole transient MAXI J1820+070

2020 ◽  
Vol 640 ◽  
pp. L3 ◽  
Author(s):  
J. Sánchez-Sierras ◽  
T. Muñoz-Darias
Keyword(s):  
Black Hole ◽  
Emission Line ◽  
Near Infrared ◽  
Nir Spectroscopy ◽  
Accretion Disc ◽  
Emission Lines ◽  
X Rays ◽  
Data Set ◽  
Soft State ◽  
Hard State

The black hole transient MAXI J1820+070 displayed optical P Cyg profiles and other wind-related emission line features during the hard state of its discovery outburst. We present near-infrared (NIR) spectroscopy covering the different accretion states of the system during this event. Our eight-epoch data set (VLT/X-shooter) reveals strong variability in the properties of the NIR emission lines. This includes absorption troughs and extended emission line wings with kinetic properties that are remarkably similar to those inferred from the wind signatures observed in optical emission lines, indicating that they most likely trace the same accretion disc wind. Unlike the optical features, these NIR signatures are not exclusive of the hard state, as they are also witnessed across the soft state with similar observational properties. This supports the presence of a relatively steady outflow during the entire outburst of the system, and it represents the first detection of an accretion disc wind in a black hole soft state at energies other than X-rays. We discuss the visibility of the wind as a function of the spectral band and the potential of NIR spectroscopy for wind studies, in particular during luminous accretion phases.

scholarly journals SDSS-IV/SPIDERS: A catalogue of X-ray selected AGN properties

2019 ◽  
Vol 625 ◽  
pp. A123 ◽  
Author(s):  
D. Coffey ◽  
M. Salvato ◽  
A. Merloni ◽  
Th. Boller ◽  
K. Nandra ◽  
...  
Keyword(s):  
Black Hole ◽  
Spectral Properties ◽  
Value Added ◽  
Emission Lines ◽  
Black Hole Mass ◽  
X Ray ◽  
Sky Survey ◽  
Spectroscopic Identification ◽  
Single Epoch ◽  
Black Hole Masses

This work presents the catalogue of optical spectral properties for all X-ray selected SPIDERS active galactic nuclei (AGN) up to SDSS DR14. SPIDERS (SPectroscopic IDentification of eROSITA Sources) is an SDSS-IV programme that is currently conducting optical spectroscopy of the counterparts to the X-ray selected sources detected in the ROSAT all-sky survey and the XMM-Newton slew survey in the footprint of the Extended Baryon Oscillation Spectroscopic Survey (eBOSS). The SPIDERS DR14 sample is the largest sample of X-ray selected AGN with optical spectroscopic follow-up to date. The catalogue presented here is based on a clean sample of 7344 2RXS (z¯ = 0.5) and 1157 XMM-Newton slew survey (z¯ = 0.4) type 1 AGN with spectroscopic coverage of the Hβ and/or MgII emission lines. Visual inspection results for each object in this sample are available from a combination of literature sources and the SPIDERS group, which provide both reliable redshifts and source classifications. The spectral regions around the Hβ and MgII emission lines have been fit in order to measure both line and continuum properties, estimate bolometric luminosities, and provide black hole mass estimates using the single-epoch (or photoionisation) method. The use of both Hβ and MgII allows black hole masses to be estimated up to z ≃ 2.5. A comparison is made between the spectral properties and black hole mass estimates derived from Hβ and MgII using the subsample of objects which have coverage of both lines in their spectrum. These results have been made publicly available as an SDSS-IV DR14 value added catalogue.

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