Revealing the structure of the lensed quasar Q 0957+561 III. Constraints on the size of the broad-line region
| Title: | Revealing the structure of the lensed quasar Q 0957+561 III. Constraints on the size of the broad-line region |
|---|---|
| Authors: | Fian, C., Muñoz, J. A., Mediavilla, E., Jiménez-Vicente, J., Motta, V., Chelouche, D., Wurzer, A., Hanslmeier, A., Rojas, K. |
| Source: | A&A 678, A108 (2023) |
| Publication Year: | 2023 |
| Collection: | Astrophysics |
| Subject Terms: | Astrophysics - Astrophysics of Galaxies |
| More Details: | Our aim is to examine the size, kinematics, and geometry of the broad-line region (BLR) in the double-lensed quasar Q 0957+561 by analyzing the impact of microlensing on various rest-frame ultraviolet broad-emission lines (BELs). We explore the influence of intrinsic variability and microlensing on the C IV, C III], and Mg II emission lines through multiple spectroscopic observations taken between April 1999 and January 2017. By utilizing the line cores as a reference for no microlensing and correcting for the long time delay between the images, we estimate the sizes of the regions emitting the broad-line wings using a Bayesian approach. Our study of the microlensing amplitudes between the lensed images of the quasar Q 0957+561 reveals differing sizes of the regions emitting the three prominent BELs C IV, C III], and Mg II. The strength of the differential microlensing indicates that the high-ionization line C IV arises from a compact inner region of the BLR with a half-light radius of $R_{1/2} \gtrsim 16.0$ lt-days, which represents a lower limit on the overall size of the BLR and is comparable to the size of the region emitting the r-band continuum in this system. A somewhat larger size of $R_{1/2}\gtrsim 44$ lt-days is obtained for the semi-forbidden line C III]. Microlensing has a weak impact on the lower-ionization line Mg II, which is emitted from a region with a half-light radius of $R_{1/2} \gtrsim 50$ lt-days. These findings suggest that the BEL regions may have distinct geometries and kinematics, with the more extended ones being spherically symmetric, and the most compact ones being nonspherical, with motions likely confined to a plane. |
| Document Type: | Working Paper |
| DOI: | 10.1051/0004-6361/202140975 |
| Access URL: | http://arxiv.org/abs/2307.02914 |
| Accession Number: | edsarx.2307.02914 |
| Database: | arXiv |
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| Items | – Name: Title Label: Title Group: Ti Data: Revealing the structure of the lensed quasar Q 0957+561 III. Constraints on the size of the broad-line region – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Fian%2C+C%2E%22">Fian, C.</searchLink><br /><searchLink fieldCode="AR" term="%22Muñoz%2C+J%2E+A%2E%22">Muñoz, J. A.</searchLink><br /><searchLink fieldCode="AR" term="%22Mediavilla%2C+E%2E%22">Mediavilla, E.</searchLink><br /><searchLink fieldCode="AR" term="%22Jiménez-Vicente%2C+J%2E%22">Jiménez-Vicente, J.</searchLink><br /><searchLink fieldCode="AR" term="%22Motta%2C+V%2E%22">Motta, V.</searchLink><br /><searchLink fieldCode="AR" term="%22Chelouche%2C+D%2E%22">Chelouche, D.</searchLink><br /><searchLink fieldCode="AR" term="%22Wurzer%2C+A%2E%22">Wurzer, A.</searchLink><br /><searchLink fieldCode="AR" term="%22Hanslmeier%2C+A%2E%22">Hanslmeier, A.</searchLink><br /><searchLink fieldCode="AR" term="%22Rojas%2C+K%2E%22">Rojas, K.</searchLink> – Name: TitleSource Label: Source Group: Src Data: A&A 678, A108 (2023) – Name: DatePubCY Label: Publication Year Group: Date Data: 2023 – Name: Subset Label: Collection Group: HoldingsInfo Data: Astrophysics – Name: Subject Label: Subject Terms Group: Su Data: <searchLink fieldCode="DE" term="%22Astrophysics+-+Astrophysics+of+Galaxies%22">Astrophysics - Astrophysics of Galaxies</searchLink> – Name: Abstract Label: Description Group: Ab Data: Our aim is to examine the size, kinematics, and geometry of the broad-line region (BLR) in the double-lensed quasar Q 0957+561 by analyzing the impact of microlensing on various rest-frame ultraviolet broad-emission lines (BELs). We explore the influence of intrinsic variability and microlensing on the C IV, C III], and Mg II emission lines through multiple spectroscopic observations taken between April 1999 and January 2017. By utilizing the line cores as a reference for no microlensing and correcting for the long time delay between the images, we estimate the sizes of the regions emitting the broad-line wings using a Bayesian approach. Our study of the microlensing amplitudes between the lensed images of the quasar Q 0957+561 reveals differing sizes of the regions emitting the three prominent BELs C IV, C III], and Mg II. The strength of the differential microlensing indicates that the high-ionization line C IV arises from a compact inner region of the BLR with a half-light radius of $R_{1/2} \gtrsim 16.0$ lt-days, which represents a lower limit on the overall size of the BLR and is comparable to the size of the region emitting the r-band continuum in this system. A somewhat larger size of $R_{1/2}\gtrsim 44$ lt-days is obtained for the semi-forbidden line C III]. Microlensing has a weak impact on the lower-ionization line Mg II, which is emitted from a region with a half-light radius of $R_{1/2} \gtrsim 50$ lt-days. These findings suggest that the BEL regions may have distinct geometries and kinematics, with the more extended ones being spherically symmetric, and the most compact ones being nonspherical, with motions likely confined to a plane. – Name: TypeDocument Label: Document Type Group: TypDoc Data: Working Paper – Name: DOI Label: DOI Group: ID Data: 10.1051/0004-6361/202140975 – Name: URL Label: Access URL Group: URL Data: <link linkTarget="URL" linkTerm="http://arxiv.org/abs/2307.02914" linkWindow="_blank">http://arxiv.org/abs/2307.02914</link> – Name: AN Label: Accession Number Group: ID Data: edsarx.2307.02914 |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1051/0004-6361/202140975 Subjects: – SubjectFull: Astrophysics - Astrophysics of Galaxies Type: general Titles: – TitleFull: Revealing the structure of the lensed quasar Q 0957+561 III. Constraints on the size of the broad-line region Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Fian, C. – PersonEntity: Name: NameFull: Muñoz, J. A. – PersonEntity: Name: NameFull: Mediavilla, E. – PersonEntity: Name: NameFull: Jiménez-Vicente, J. – PersonEntity: Name: NameFull: Motta, V. – PersonEntity: Name: NameFull: Chelouche, D. – PersonEntity: Name: NameFull: Wurzer, A. – PersonEntity: Name: NameFull: Hanslmeier, A. – PersonEntity: Name: NameFull: Rojas, K. IsPartOfRelationships: – BibEntity: Dates: – D: 06 M: 07 Type: published Y: 2023 |
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