A Broad-line Quasar with Unexplained Extreme Velocity Offsets: Post-shock Outflow?
The quasar SDSS 0956 + 5128 exhibits three distinct velocity components with large offsets in emission: the systemic velocity of [O ii ], [O iii ], and [Ne iii ] narrow lines have redshift z = 0.7142; the broad Mg ii line is shifted by −1200 km s ^−1 with respect to the narrow lines; the broad H α a...
| Main Authors: | , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
IOP Publishing
2023-01-01
|
| Series: | The Astrophysical Journal |
| Subjects: | |
| Online Access: | https://doi.org/10.3847/1538-4357/acadd8 |
| _version_ | 1827830767284125696 |
|---|---|
| author | Vadim Rusakov Charles L. Steinhardt Malte Schramm Andreas L. Faisst Daniel Masters Bahram Mobasher Petchara Pattarakijwanich |
| author_facet | Vadim Rusakov Charles L. Steinhardt Malte Schramm Andreas L. Faisst Daniel Masters Bahram Mobasher Petchara Pattarakijwanich |
| author_sort | Vadim Rusakov |
| collection | DOAJ |
| description | The quasar SDSS 0956 + 5128 exhibits three distinct velocity components with large offsets in emission: the systemic velocity of [O ii ], [O iii ], and [Ne iii ] narrow lines have redshift z = 0.7142; the broad Mg ii line is shifted by −1200 km s ^−1 with respect to the narrow lines; the broad H α and H β lines are at −4100 km s ^−1 . We present new Hubble Space Telescope spectra of Ly α and C iv emission lines and high-resolution images of the quasar. The offsets of these lines are consistent with the velocity component of the Balmer emission, and the photometry in optical and near-infrared wavelengths does not show any signs of recent mergers in the host galaxy or irregularities in the location of the quasar. The data do not confirm predictions of the previous most likely hypotheses involving a special orientation and morphology of the quasar disk, such as in the recoiling black hole scenario, neither it is consistent with accretion disk winds. Instead, based on the cumulative evidence, we propose a new scenario, in which the broad-line region is in the state of outflow caused by a strong shock wave, with a supernova as a possible event for producing the shock ejecta. |
| first_indexed | 2024-03-12T04:34:03Z |
| format | Article |
| id | doaj.art-a045f5d8c92f440498b3dd23e0a1de69 |
| institution | Directory Open Access Journal |
| issn | 1538-4357 |
| language | English |
| last_indexed | 2024-03-12T04:34:03Z |
| publishDate | 2023-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal |
| spelling | doaj.art-a045f5d8c92f440498b3dd23e0a1de692023-09-03T09:58:18ZengIOP PublishingThe Astrophysical Journal1538-43572023-01-01944221710.3847/1538-4357/acadd8A Broad-line Quasar with Unexplained Extreme Velocity Offsets: Post-shock Outflow?Vadim Rusakov0https://orcid.org/0000-0001-7633-3985Charles L. Steinhardt1https://orcid.org/0000-0003-3780-6801Malte Schramm2https://orcid.org/0000-0001-7825-0075Andreas L. Faisst3https://orcid.org/0000-0002-9382-9832Daniel Masters4https://orcid.org/0000-0001-5382-6138Bahram Mobasher5https://orcid.org/0000-0001-5846-4404Petchara Pattarakijwanich6https://orcid.org/0000-0001-8451-5316Niels Bohr Institute, University of Copenhagen , Lyngbyvej 2, København Ø 2100, Denmark ; rusakov124@gmail.com; Cosmic Dawn Center (DAWN) , DenmarkCosmic Dawn Center (DAWN) , Denmark; Niels Bohr Institute, University of Copenhagen , Lyngbyvej 2, København Ø 2100, DenmarkGraduate school of Science and Engineering , Saitama Univ., 255 Shimo-Okubo, Sakura-ku, Saitama City, Saitama 338-8570, JapanCalifornia institute of Technology , 1200 E California Blvd, Pasadena, CA 91125, USACalifornia institute of Technology , 1200 E California Blvd, Pasadena, CA 91125, USADepartment of Physics and Astronomy, University of California , Riverside, 900 University Avenue, Riverside, CA 92521, USADepartment of Physics, Faculty of Science, Mahidol University , 272 Rama IV Road, Ratchathewi, Bangkok, ThailandThe quasar SDSS 0956 + 5128 exhibits three distinct velocity components with large offsets in emission: the systemic velocity of [O ii ], [O iii ], and [Ne iii ] narrow lines have redshift z = 0.7142; the broad Mg ii line is shifted by −1200 km s ^−1 with respect to the narrow lines; the broad H α and H β lines are at −4100 km s ^−1 . We present new Hubble Space Telescope spectra of Ly α and C iv emission lines and high-resolution images of the quasar. The offsets of these lines are consistent with the velocity component of the Balmer emission, and the photometry in optical and near-infrared wavelengths does not show any signs of recent mergers in the host galaxy or irregularities in the location of the quasar. The data do not confirm predictions of the previous most likely hypotheses involving a special orientation and morphology of the quasar disk, such as in the recoiling black hole scenario, neither it is consistent with accretion disk winds. Instead, based on the cumulative evidence, we propose a new scenario, in which the broad-line region is in the state of outflow caused by a strong shock wave, with a supernova as a possible event for producing the shock ejecta.https://doi.org/10.3847/1538-4357/acadd8QuasarsShocksSupernovae |
| spellingShingle | Vadim Rusakov Charles L. Steinhardt Malte Schramm Andreas L. Faisst Daniel Masters Bahram Mobasher Petchara Pattarakijwanich A Broad-line Quasar with Unexplained Extreme Velocity Offsets: Post-shock Outflow? The Astrophysical Journal Quasars Shocks Supernovae |
| title | A Broad-line Quasar with Unexplained Extreme Velocity Offsets: Post-shock Outflow? |
| title_full | A Broad-line Quasar with Unexplained Extreme Velocity Offsets: Post-shock Outflow? |
| title_fullStr | A Broad-line Quasar with Unexplained Extreme Velocity Offsets: Post-shock Outflow? |
| title_full_unstemmed | A Broad-line Quasar with Unexplained Extreme Velocity Offsets: Post-shock Outflow? |
| title_short | A Broad-line Quasar with Unexplained Extreme Velocity Offsets: Post-shock Outflow? |
| title_sort | broad line quasar with unexplained extreme velocity offsets post shock outflow |
| topic | Quasars Shocks Supernovae |
| url | https://doi.org/10.3847/1538-4357/acadd8 |
| work_keys_str_mv | AT vadimrusakov abroadlinequasarwithunexplainedextremevelocityoffsetspostshockoutflow AT charleslsteinhardt abroadlinequasarwithunexplainedextremevelocityoffsetspostshockoutflow AT malteschramm abroadlinequasarwithunexplainedextremevelocityoffsetspostshockoutflow AT andreaslfaisst abroadlinequasarwithunexplainedextremevelocityoffsetspostshockoutflow AT danielmasters abroadlinequasarwithunexplainedextremevelocityoffsetspostshockoutflow AT bahrammobasher abroadlinequasarwithunexplainedextremevelocityoffsetspostshockoutflow AT petcharapattarakijwanich abroadlinequasarwithunexplainedextremevelocityoffsetspostshockoutflow AT vadimrusakov broadlinequasarwithunexplainedextremevelocityoffsetspostshockoutflow AT charleslsteinhardt broadlinequasarwithunexplainedextremevelocityoffsetspostshockoutflow AT malteschramm broadlinequasarwithunexplainedextremevelocityoffsetspostshockoutflow AT andreaslfaisst broadlinequasarwithunexplainedextremevelocityoffsetspostshockoutflow AT danielmasters broadlinequasarwithunexplainedextremevelocityoffsetspostshockoutflow AT bahrammobasher broadlinequasarwithunexplainedextremevelocityoffsetspostshockoutflow AT petcharapattarakijwanich broadlinequasarwithunexplainedextremevelocityoffsetspostshockoutflow |