other query modes : |
Identifier query |
Coordinate query |
Criteria query |
Reference query |
Basic query |
Script submission |
TAP |
Output options |
Object types |
Help |
Query : 2010MNRAS.409..591F |
2010MNRAS.409..591F - Mon. Not. R. Astron. Soc., 409, 591-610 (2010/December-1)
The CIV linewidth distribution for quasars and its implications for broad-line region dynamics and virial mass estimation.
FINE S., CROOM S.M., BLAND-HAWTHORN J., PIMBBLET K.A., ROSS N.P., SCHNEIDER D.P. and SHANKS T.
Abstract (from CDS):
The results are compared with a previous study of the Mgiiλ2799 line in the same sample. We find the Civ line tends to be broader than the Mgii line in spectra that have both lines, and the average ratio between the lines is consistent with a simplistic model for a photoionized, virialized and stratified broad-line region. There exists a statistically significant correlation between the widths of the Civ and Mgii lines. However, the correlation is weak, and the scatter around a best fit is only marginally less than the full dynamic range of linewidths.
Motivated by previous work on the Mgii line, we examine the dispersion in the distribution of Civ linewidths. We find that the dispersion in Civ linewidths is essentially independent of both redshift and luminosity. This result is in stark contrast to the Mgii line, which shows a strong luminosity dependence. Furthermore, we demonstrate that the low level of dispersion in Civ linewidth (∼0.08dex) is inconsistent with a pure-disc model for the emitting region and use our data to constrain simple models for the broad-line region.
Finally, we consider our results in terms of their implications for the virial technique for estimating black hole masses. The inconsistency between Mgii and Civ linewidths in single spectra, combined with the differing behaviour of the Mgii and Civ linewidth distributions as a whole, indicates that there must be an inconsistency between Mgii and Civ virial mass estimators. Furthermore, the level of intrinsic dispersion in Mgii and Civ linewidths contributes less dynamic range to virial mass estimates than the error associated with the estimates. The indication is that the linewidth term in these UV virial mass estimators may be essentially irrelevant with respect to the typical uncertainty on a mass estimate.
Abstract Copyright: © 2010 The Authors. Monthly Notices of the Royal Astronomical Society © 2010 RAS
Journal keyword(s): galaxies: active - quasars: absorption lines - quasars: emission lines - quasars: general
Simbad objects: 4
Number of rows : 4 |
N | Identifier | Otype |
ICRS (J2000) RA |
ICRS (J2000) DEC |
Mag U | Mag B | Mag V | Mag R | Mag I | Sp type |
#ref
1850 - 2024 |
#notes |
---|---|---|---|---|---|---|---|---|---|---|---|---|
1 | SDSS J010810.52+001755.8 | QSO | 01 08 10.5230847192 | +00 17 55.832291016 | 20.58 | 20.49 | ~ | 21 | 0 | |||
2 | [VV2006] J011229.4+151213 | Sy1 | 01 12 29.41 | +15 12 14.0 | 20.30 | 19.72 | ~ | 23 | 0 | |||
3 | [VV2006] J024634.1-082536 | QSO | 02 46 34.1073782928 | -08 25 36.209854308 | 18.42 | 18.20 | 17.94 | ~ | 59 | 1 | ||
4 | [VV2006] J222203.7-320438 | QSO | 22 22 03.6976294056 | -32 04 37.259031108 | 18.62 | ~ | 5 | 0 |
To bookmark this query, right click on this link: simbad:objects in 2010MNRAS.409..591F and select 'bookmark this link' or equivalent in the popup menu