Periodical
The Effect of Variability on the Estimation of Quasar Black Hole Masses
| العنوان: | The Effect of Variability on the Estimation of Quasar Black Hole Masses |
|---|---|
| المؤلفون: | Wilhite, Brian C., Brunner, Robert J., Schneider, Donald P., Vanden, Daniel E. |
| المصدر: | The Astrophysical Journal; November 2007, Vol. 669 Issue: 2 p791-800, 10p |
| مستخلص: | We investigate the time-dependent variations of ultraviolet (UV) black hole mass estimates of quasars in the Sloan Digital Sky Survey (SDSS). From SDSS spectra of 615 high-redshift (1.69 < z < 4.75) quasars with spectra from two epochs, we estimate black hole masses using a single-epoch technique, which employs an additional, automated night-sky line removal and relies on UV continuum luminosity and C IV l1549 emission-line dispersion. Mass estimates show variations between epochs at about the 30% level for the sample as a whole. We determine that for our full sample, measurement error in the line dispersion likely plays a larger role than the inherent variability in terms of contributing to variations in mass estimates between epochs. However, we use the variations in quasars with r-band spectral signal-to-noise ratio greater than 15 to estimate that the contribution to these variations from inherent variability is roughly 20%. We conclude that these differences in black hole mass estimates between epochs indicate that variability does not make a large contribution to the current factor of 2 scatter between mass estimates derived from low- and high-ionization emission lines. |
| قاعدة البيانات: | Supplemental Index |
Full Text Finder | ResultId |
1 |
|---|---|
| Header |
edo Supplemental Index ejs18566140 818 6 Periodical serialPeriodical 817.927795410156 |
| PLink |
https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&scope=site&db=edo&AN=ejs18566140&custid=s6537998&authtype=sso |
| FullText |
Array
(
[Availability] => 0
)
Array ( [0] => Array ( [Url] => https://resolver.ebscohost.com/openurl?custid=s6537998&groupid=main&authtype=ip,guest&sid=EBSCO:edo&genre=article&issn=0004637X&ISBN=&volume=669&issue=2&date=20071110&spage=791&pages=791-800&title=The Astrophysical Journal&atitle=The%20Effect%20of%20Variability%20on%20the%20Estimation%20of%20Quasar%20Black%20Hole%20Masses&id=DOI: [Name] => Full Text Finder (s6537998api) [Category] => fullText [Text] => Full Text Finder [Icon] => https://imageserver.ebscohost.com/branding/images/FTF.gif [MouseOverText] => Full Text Finder ) ) |
| Items |
Array
(
[Name] => Title
[Label] => Title
[Group] => Ti
[Data] => The Effect of Variability on the Estimation of Quasar Black Hole Masses
)
Array ( [Name] => Author [Label] => Authors [Group] => Au [Data] => <searchLink fieldCode="AR" term="%22Wilhite%2C+Brian+C%2E%22">Wilhite, Brian C.</searchLink><br /><searchLink fieldCode="AR" term="%22Brunner%2C+Robert+J%2E%22">Brunner, Robert J.</searchLink><br /><searchLink fieldCode="AR" term="%22Schneider%2C+Donald+P%2E%22">Schneider, Donald P.</searchLink><br /><searchLink fieldCode="AR" term="%22Vanden%2C+Daniel+E%2E%22">Vanden, Daniel E.</searchLink> ) Array ( [Name] => TitleSource [Label] => Source [Group] => Src [Data] => The Astrophysical Journal; November 2007, Vol. 669 Issue: 2 p791-800, 10p ) Array ( [Name] => Abstract [Label] => Abstract [Group] => Ab [Data] => We investigate the time-dependent variations of ultraviolet (UV) black hole mass estimates of quasars in the Sloan Digital Sky Survey (SDSS). From SDSS spectra of 615 high-redshift (1.69 < z < 4.75) quasars with spectra from two epochs, we estimate black hole masses using a single-epoch technique, which employs an additional, automated night-sky line removal and relies on UV continuum luminosity and C IV l1549 emission-line dispersion. Mass estimates show variations between epochs at about the 30% level for the sample as a whole. We determine that for our full sample, measurement error in the line dispersion likely plays a larger role than the inherent variability in terms of contributing to variations in mass estimates between epochs. However, we use the variations in quasars with r-band spectral signal-to-noise ratio greater than 15 to estimate that the contribution to these variations from inherent variability is roughly 20%. We conclude that these differences in black hole mass estimates between epochs indicate that variability does not make a large contribution to the current factor of 2 scatter between mass estimates derived from low- and high-ionization emission lines. ) |
| RecordInfo |
Array
(
[BibEntity] => Array
(
[Languages] => Array
(
[0] => Array
(
[Code] => eng
[Text] => English
)
)
[PhysicalDescription] => Array
(
[Pagination] => Array
(
[PageCount] => 10
[StartPage] => 791
)
)
[Titles] => Array
(
[0] => Array
(
[TitleFull] => The Effect of Variability on the Estimation of Quasar Black Hole Masses
[Type] => main
)
)
)
[BibRelationships] => Array
(
[HasContributorRelationships] => Array
(
[0] => Array
(
[PersonEntity] => Array
(
[Name] => Array
(
[NameFull] => Wilhite, Brian C.
)
)
)
[1] => Array
(
[PersonEntity] => Array
(
[Name] => Array
(
[NameFull] => Brunner, Robert J.
)
)
)
[2] => Array
(
[PersonEntity] => Array
(
[Name] => Array
(
[NameFull] => Schneider, Donald P.
)
)
)
[3] => Array
(
[PersonEntity] => Array
(
[Name] => Array
(
[NameFull] => Vanden, Daniel E.
)
)
)
)
[IsPartOfRelationships] => Array
(
[0] => Array
(
[BibEntity] => Array
(
[Dates] => Array
(
[0] => Array
(
[D] => 10
[M] => 11
[Text] => November 2007
[Type] => published
[Y] => 2007
)
)
[Identifiers] => Array
(
[0] => Array
(
[Type] => issn-print
[Value] => 0004637X
)
[1] => Array
(
[Type] => issn-print
[Value] => 15384357
)
)
[Numbering] => Array
(
[0] => Array
(
[Type] => volume
[Value] => 669
)
[1] => Array
(
[Type] => issue
[Value] => 2
)
)
[Titles] => Array
(
[0] => Array
(
[TitleFull] => The Astrophysical Journal
[Type] => main
)
)
)
)
)
)
)
|
| IllustrationInfo |