Gaia-assisted discovery of a detached low-ionisation BAL quasar with very large ejection velocities

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Gaia-assisted discovery of a detached low-ionisation BAL quasar with very large ejection velocities. / Fynbo, J. P. U.; Moller, P.; Heintz, K. E.; Burchett, J. N.; Christensen, L.; Geier, S. J.; Jakobsson, P.; Krogager, J-K; Ledoux, C.; Milvang-Jensen, B.; Noterdaeme, P.; Prochaska, J. X.; Tripp, T. M.

In: Astronomy & Astrophysics, Vol. 634, A111, 19.02.2020.

Research output: Contribution to journalJournal articlepeer-review

Harvard

Fynbo, JPU, Moller, P, Heintz, KE, Burchett, JN, Christensen, L, Geier, SJ, Jakobsson, P, Krogager, J-K, Ledoux, C, Milvang-Jensen, B, Noterdaeme, P, Prochaska, JX & Tripp, TM 2020, 'Gaia-assisted discovery of a detached low-ionisation BAL quasar with very large ejection velocities', Astronomy & Astrophysics, vol. 634, A111. https://doi.org/10.1051/0004-6361/201936957

APA

Fynbo, J. P. U., Moller, P., Heintz, K. E., Burchett, J. N., Christensen, L., Geier, S. J., Jakobsson, P., Krogager, J-K., Ledoux, C., Milvang-Jensen, B., Noterdaeme, P., Prochaska, J. X., & Tripp, T. M. (2020). Gaia-assisted discovery of a detached low-ionisation BAL quasar with very large ejection velocities. Astronomy & Astrophysics, 634, [A111]. https://doi.org/10.1051/0004-6361/201936957

Vancouver

Fynbo JPU, Moller P, Heintz KE, Burchett JN, Christensen L, Geier SJ et al. Gaia-assisted discovery of a detached low-ionisation BAL quasar with very large ejection velocities. Astronomy & Astrophysics. 2020 Feb 19;634. A111. https://doi.org/10.1051/0004-6361/201936957

Author

Fynbo, J. P. U. ; Moller, P. ; Heintz, K. E. ; Burchett, J. N. ; Christensen, L. ; Geier, S. J. ; Jakobsson, P. ; Krogager, J-K ; Ledoux, C. ; Milvang-Jensen, B. ; Noterdaeme, P. ; Prochaska, J. X. ; Tripp, T. M. / Gaia-assisted discovery of a detached low-ionisation BAL quasar with very large ejection velocities. In: Astronomy & Astrophysics. 2020 ; Vol. 634.

Bibtex

@article{c92e8797a6b44198b70dc3d9794827bd,
title = "Gaia-assisted discovery of a detached low-ionisation BAL quasar with very large ejection velocities",
abstract = "We report on the discovery of a peculiar broad absorption line (BAL) quasar identified in our Gaia-assisted survey of red quasars. The systemic redshift of this quasar was difficult to establish because of the absence of conspicuous emission lines. Based on deep and broad BAL troughs of at least Six202f;IV, Cx202f;IV, and Alx202f;III, a redshift of zx2004;=& x2004;2.41 was established under the assumption that the systemic redshift can be inferred from the red edge of the BAL troughs. However, we observe a weak and spatially extended emission line at 4450 angstrom that is most likely due to Lyman-alpha emission, which implies a systemic redshift of zx2004;=x2004;2.66 if correctly identified. There is also evidence for the onset of Lyman-alpha forest absorption bluewards of 4450 angstrom and evidence for H alpha emission in the K band consistent with a systemic redshift of zx2004;=& x2004;2.66. If this redshift is correct, the quasar is an extreme example of a detached low-ionisation BAL quasar. The BALs must originate from material moving with very large velocities ranging from 22 000 km s(-1) to 40 000 km s(-1). To our knowledge, this is the first case of a systemic-redshift measurement based on extended Lyman-alpha emission for a BAL quasar. This method could also be useful in cases of sufficiently distant BL Lac quasars without systemic-redshift information.",
keywords = "quasars, general, absorption lines, individual, GQ 1309+2604, BROAD ABSORPTION-LINE, LYMAN-ALPHA EMISSION, POLARIZATION PROPERTIES, SKY, VARIABILITY",
author = "Fynbo, {J. P. U.} and P. Moller and Heintz, {K. E.} and Burchett, {J. N.} and L. Christensen and Geier, {S. J.} and P. Jakobsson and J-K Krogager and C. Ledoux and B. Milvang-Jensen and P. Noterdaeme and Prochaska, {J. X.} and Tripp, {T. M.}",
year = "2020",
month = feb,
day = "19",
doi = "10.1051/0004-6361/201936957",
language = "English",
volume = "634",
journal = "Astronomy & Astrophysics",
issn = "0004-6361",
publisher = "E D P Sciences",

}

RIS

TY - JOUR

T1 - Gaia-assisted discovery of a detached low-ionisation BAL quasar with very large ejection velocities

AU - Fynbo, J. P. U.

AU - Moller, P.

AU - Heintz, K. E.

AU - Burchett, J. N.

AU - Christensen, L.

AU - Geier, S. J.

AU - Jakobsson, P.

AU - Krogager, J-K

AU - Ledoux, C.

AU - Milvang-Jensen, B.

AU - Noterdaeme, P.

AU - Prochaska, J. X.

AU - Tripp, T. M.

PY - 2020/2/19

Y1 - 2020/2/19

N2 - We report on the discovery of a peculiar broad absorption line (BAL) quasar identified in our Gaia-assisted survey of red quasars. The systemic redshift of this quasar was difficult to establish because of the absence of conspicuous emission lines. Based on deep and broad BAL troughs of at least Six202f;IV, Cx202f;IV, and Alx202f;III, a redshift of zx2004;=& x2004;2.41 was established under the assumption that the systemic redshift can be inferred from the red edge of the BAL troughs. However, we observe a weak and spatially extended emission line at 4450 angstrom that is most likely due to Lyman-alpha emission, which implies a systemic redshift of zx2004;=x2004;2.66 if correctly identified. There is also evidence for the onset of Lyman-alpha forest absorption bluewards of 4450 angstrom and evidence for H alpha emission in the K band consistent with a systemic redshift of zx2004;=& x2004;2.66. If this redshift is correct, the quasar is an extreme example of a detached low-ionisation BAL quasar. The BALs must originate from material moving with very large velocities ranging from 22 000 km s(-1) to 40 000 km s(-1). To our knowledge, this is the first case of a systemic-redshift measurement based on extended Lyman-alpha emission for a BAL quasar. This method could also be useful in cases of sufficiently distant BL Lac quasars without systemic-redshift information.

AB - We report on the discovery of a peculiar broad absorption line (BAL) quasar identified in our Gaia-assisted survey of red quasars. The systemic redshift of this quasar was difficult to establish because of the absence of conspicuous emission lines. Based on deep and broad BAL troughs of at least Six202f;IV, Cx202f;IV, and Alx202f;III, a redshift of zx2004;=& x2004;2.41 was established under the assumption that the systemic redshift can be inferred from the red edge of the BAL troughs. However, we observe a weak and spatially extended emission line at 4450 angstrom that is most likely due to Lyman-alpha emission, which implies a systemic redshift of zx2004;=x2004;2.66 if correctly identified. There is also evidence for the onset of Lyman-alpha forest absorption bluewards of 4450 angstrom and evidence for H alpha emission in the K band consistent with a systemic redshift of zx2004;=& x2004;2.66. If this redshift is correct, the quasar is an extreme example of a detached low-ionisation BAL quasar. The BALs must originate from material moving with very large velocities ranging from 22 000 km s(-1) to 40 000 km s(-1). To our knowledge, this is the first case of a systemic-redshift measurement based on extended Lyman-alpha emission for a BAL quasar. This method could also be useful in cases of sufficiently distant BL Lac quasars without systemic-redshift information.

KW - quasars

KW - general

KW - absorption lines

KW - individual

KW - GQ 1309+2604

KW - BROAD ABSORPTION-LINE

KW - LYMAN-ALPHA EMISSION

KW - POLARIZATION PROPERTIES

KW - SKY

KW - VARIABILITY

U2 - 10.1051/0004-6361/201936957

DO - 10.1051/0004-6361/201936957

M3 - Journal article

VL - 634

JO - Astronomy & Astrophysics

JF - Astronomy & Astrophysics

SN - 0004-6361

M1 - A111

ER -

ID: 247985549