An unusual "mini-BAL" quasar at z = 4.59

Christopher W. Churchill, Donald P. Schneider, Maarten Schmidt, James E. Gunn

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

The z = 4.591 quasar PC 1415 + 3408 exhibits very strong associated metal-line absorption from the N v λλ1238, 1242, Si IV λλ1393, 1402, and C IV λλ1548, 1550 doublets spanning the velocity interval - 1700 km s-1 ≤ υ ≤ 0 km s-1. Also present are detached absorption troughs in N v and C IV spanning -5000 km s-1 ≤ υ ≤ -3000 km s-1; this is characteristic of broad absorption line (BAL) quasars, but the small overall velocity spread suggests that PC 1415 + 3408 be classified as a "mini-BAL" quasar. The N v doublet is consistent with black saturation over the velocity interval -1200 to -500 km s-1; black N v absorption is extraordinary in all classes of quasars at all redshifts. Over this velocity interval, the C IV doublet is severely blended but also consistent with black saturation. The material over this range of velocity appears to fully occult the continuum source, the broad emission line region, and any material that could give rise to scattered light. In view of a unified scenario for BAL and mini-BAL absorption, these facts imply that the quasar is being viewed along a preferred direction. On the other hand, the black mini-BALs in PC 1415 + 3408 could be explained if the BAL flow has an unusual geometry compared with the population of BAL quasars and/or the spatial extent of a scattering region is small at the lower velocities (-1700 km s-1 ≤ υ ≤ 0 km s-1).

Original languageEnglish (US)
Pages (from-to)2573-2581
Number of pages9
JournalAstronomical Journal
Volume117
Issue number6
DOIs
StatePublished - Jun 1999

Fingerprint

quasars
intervals
saturation
troughs
low speed
trough
scattering
continuums
geometry
metal
metals

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Churchill, C. W., Schneider, D. P., Schmidt, M., & Gunn, J. E. (1999). An unusual "mini-BAL" quasar at z = 4.59. Astronomical Journal, 117(6), 2573-2581. https://doi.org/10.1086/300884
Churchill, Christopher W. ; Schneider, Donald P. ; Schmidt, Maarten ; Gunn, James E. / An unusual "mini-BAL" quasar at z = 4.59. In: Astronomical Journal. 1999 ; Vol. 117, No. 6. pp. 2573-2581.
@article{c22140a584d14c229d9045d1ef81e232,
title = "An unusual {"}mini-BAL{"} quasar at z = 4.59",
abstract = "The z = 4.591 quasar PC 1415 + 3408 exhibits very strong associated metal-line absorption from the N v λλ1238, 1242, Si IV λλ1393, 1402, and C IV λλ1548, 1550 doublets spanning the velocity interval - 1700 km s-1 ≤ υ ≤ 0 km s-1. Also present are detached absorption troughs in N v and C IV spanning -5000 km s-1 ≤ υ ≤ -3000 km s-1; this is characteristic of broad absorption line (BAL) quasars, but the small overall velocity spread suggests that PC 1415 + 3408 be classified as a {"}mini-BAL{"} quasar. The N v doublet is consistent with black saturation over the velocity interval -1200 to -500 km s-1; black N v absorption is extraordinary in all classes of quasars at all redshifts. Over this velocity interval, the C IV doublet is severely blended but also consistent with black saturation. The material over this range of velocity appears to fully occult the continuum source, the broad emission line region, and any material that could give rise to scattered light. In view of a unified scenario for BAL and mini-BAL absorption, these facts imply that the quasar is being viewed along a preferred direction. On the other hand, the black mini-BALs in PC 1415 + 3408 could be explained if the BAL flow has an unusual geometry compared with the population of BAL quasars and/or the spatial extent of a scattering region is small at the lower velocities (-1700 km s-1 ≤ υ ≤ 0 km s-1).",
author = "Churchill, {Christopher W.} and Schneider, {Donald P.} and Maarten Schmidt and Gunn, {James E.}",
year = "1999",
month = "6",
doi = "10.1086/300884",
language = "English (US)",
volume = "117",
pages = "2573--2581",
journal = "Astronomical Journal",
issn = "0004-6256",
publisher = "IOP Publishing Ltd.",
number = "6",

}

Churchill, CW, Schneider, DP, Schmidt, M & Gunn, JE 1999, 'An unusual "mini-BAL" quasar at z = 4.59', Astronomical Journal, vol. 117, no. 6, pp. 2573-2581. https://doi.org/10.1086/300884

An unusual "mini-BAL" quasar at z = 4.59. / Churchill, Christopher W.; Schneider, Donald P.; Schmidt, Maarten; Gunn, James E.

In: Astronomical Journal, Vol. 117, No. 6, 06.1999, p. 2573-2581.

Research output: Contribution to journalArticle

TY - JOUR

T1 - An unusual "mini-BAL" quasar at z = 4.59

AU - Churchill, Christopher W.

AU - Schneider, Donald P.

AU - Schmidt, Maarten

AU - Gunn, James E.

PY - 1999/6

Y1 - 1999/6

N2 - The z = 4.591 quasar PC 1415 + 3408 exhibits very strong associated metal-line absorption from the N v λλ1238, 1242, Si IV λλ1393, 1402, and C IV λλ1548, 1550 doublets spanning the velocity interval - 1700 km s-1 ≤ υ ≤ 0 km s-1. Also present are detached absorption troughs in N v and C IV spanning -5000 km s-1 ≤ υ ≤ -3000 km s-1; this is characteristic of broad absorption line (BAL) quasars, but the small overall velocity spread suggests that PC 1415 + 3408 be classified as a "mini-BAL" quasar. The N v doublet is consistent with black saturation over the velocity interval -1200 to -500 km s-1; black N v absorption is extraordinary in all classes of quasars at all redshifts. Over this velocity interval, the C IV doublet is severely blended but also consistent with black saturation. The material over this range of velocity appears to fully occult the continuum source, the broad emission line region, and any material that could give rise to scattered light. In view of a unified scenario for BAL and mini-BAL absorption, these facts imply that the quasar is being viewed along a preferred direction. On the other hand, the black mini-BALs in PC 1415 + 3408 could be explained if the BAL flow has an unusual geometry compared with the population of BAL quasars and/or the spatial extent of a scattering region is small at the lower velocities (-1700 km s-1 ≤ υ ≤ 0 km s-1).

AB - The z = 4.591 quasar PC 1415 + 3408 exhibits very strong associated metal-line absorption from the N v λλ1238, 1242, Si IV λλ1393, 1402, and C IV λλ1548, 1550 doublets spanning the velocity interval - 1700 km s-1 ≤ υ ≤ 0 km s-1. Also present are detached absorption troughs in N v and C IV spanning -5000 km s-1 ≤ υ ≤ -3000 km s-1; this is characteristic of broad absorption line (BAL) quasars, but the small overall velocity spread suggests that PC 1415 + 3408 be classified as a "mini-BAL" quasar. The N v doublet is consistent with black saturation over the velocity interval -1200 to -500 km s-1; black N v absorption is extraordinary in all classes of quasars at all redshifts. Over this velocity interval, the C IV doublet is severely blended but also consistent with black saturation. The material over this range of velocity appears to fully occult the continuum source, the broad emission line region, and any material that could give rise to scattered light. In view of a unified scenario for BAL and mini-BAL absorption, these facts imply that the quasar is being viewed along a preferred direction. On the other hand, the black mini-BALs in PC 1415 + 3408 could be explained if the BAL flow has an unusual geometry compared with the population of BAL quasars and/or the spatial extent of a scattering region is small at the lower velocities (-1700 km s-1 ≤ υ ≤ 0 km s-1).

UR - http://www.scopus.com/inward/record.url?scp=0039866521&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0039866521&partnerID=8YFLogxK

U2 - 10.1086/300884

DO - 10.1086/300884

M3 - Article

AN - SCOPUS:0039866521

VL - 117

SP - 2573

EP - 2581

JO - Astronomical Journal

JF - Astronomical Journal

SN - 0004-6256

IS - 6

ER -