Near-infrared spectroscopy of PKS 1549-79: A protoquasar revealed?

M. J. Bellamy; C. N. Tadhunter; R. Morganti; K. A. Wills; J. Holt; M. D. Taylor; C. A. Watson

doi:10.1046/j.1365-8711.2003.07078.x

Near-infrared spectroscopy of PKS 1549-79: A protoquasar revealed?

M. J. Bellamy, C. N. Tadhunter, R. Morganti, K. A. Wills, J. Holt, M. D. Taylor, C. A. Watson

Faculty of Education (FE)

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Abstract

We present a near-infrared (near-IR) spectrum of the nearby radio galaxy PKS 1549-79 (z = 0.153). These data were taken with the aim of testing the idea that this object contains a quasar nucleus that is moderately extinguished, despite evidence that its radio jet points close to our line of sight. We detect broad Paα emission (FWHM 1745 ± 40 km s-1), relatively bright continuum emission, and a continuum slope consistent with a reddened quasar spectrum (3.1 <Av <7.3), all emitted by an unresolved point source. Therefore we conclude that we have, indeed, detected a hidden quasar nucleus in PKS 1549-79. Combined with previous results, these observations are consistent with the idea that PKS 1549-79 is a young radio source in which the cocoon of debris left over from the triggering events has not yet been swept aside by circumnuclear outflows.

Original language	English
Pages (from-to)	L80-L84
Journal	Monthly Notices of the Royal Astronomical Society
Volume	344
Issue number	4
DOIs	https://doi.org/10.1046/j.1365-8711.2003.07078.x
Publication status	Published - 1 Oct 2003

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@article{8509bdb03c2541928f2cf03f697f6861,

title = "Near-infrared spectroscopy of PKS 1549-79: A protoquasar revealed?",

abstract = "We present a near-infrared (near-IR) spectrum of the nearby radio galaxy PKS 1549-79 (z = 0.153). These data were taken with the aim of testing the idea that this object contains a quasar nucleus that is moderately extinguished, despite evidence that its radio jet points close to our line of sight. We detect broad Paα emission (FWHM 1745 ± 40 km s-1), relatively bright continuum emission, and a continuum slope consistent with a reddened quasar spectrum (3.1 <Av <7.3), all emitted by an unresolved point source. Therefore we conclude that we have, indeed, detected a hidden quasar nucleus in PKS 1549-79. Combined with previous results, these observations are consistent with the idea that PKS 1549-79 is a young radio source in which the cocoon of debris left over from the triggering events has not yet been swept aside by circumnuclear outflows.",

keywords = "Galaxies: active, Galaxies: individual: PKS 1549-79, Infrared: galaxies, Quasars: emission lines, Quasars: general",

author = "Bellamy, {M. J.} and Tadhunter, {C. N.} and R. Morganti and Wills, {K. A.} and J. Holt and Taylor, {M. D.} and Watson, {C. A.}",

year = "2003",

month = oct,

day = "1",

doi = "10.1046/j.1365-8711.2003.07078.x",

language = "English",

volume = "344",

pages = "L80--L84",

journal = "Monthly Notices of the Royal Astronomical Society",

issn = "0035-8711",

publisher = "Oxford University Press",

number = "4",

}

TY - JOUR

T1 - Near-infrared spectroscopy of PKS 1549-79

T2 - A protoquasar revealed?

AU - Bellamy, M. J.

AU - Tadhunter, C. N.

AU - Morganti, R.

AU - Wills, K. A.

AU - Holt, J.

AU - Taylor, M. D.

AU - Watson, C. A.

PY - 2003/10/1

Y1 - 2003/10/1

N2 - We present a near-infrared (near-IR) spectrum of the nearby radio galaxy PKS 1549-79 (z = 0.153). These data were taken with the aim of testing the idea that this object contains a quasar nucleus that is moderately extinguished, despite evidence that its radio jet points close to our line of sight. We detect broad Paα emission (FWHM 1745 ± 40 km s-1), relatively bright continuum emission, and a continuum slope consistent with a reddened quasar spectrum (3.1 <Av <7.3), all emitted by an unresolved point source. Therefore we conclude that we have, indeed, detected a hidden quasar nucleus in PKS 1549-79. Combined with previous results, these observations are consistent with the idea that PKS 1549-79 is a young radio source in which the cocoon of debris left over from the triggering events has not yet been swept aside by circumnuclear outflows.

AB - We present a near-infrared (near-IR) spectrum of the nearby radio galaxy PKS 1549-79 (z = 0.153). These data were taken with the aim of testing the idea that this object contains a quasar nucleus that is moderately extinguished, despite evidence that its radio jet points close to our line of sight. We detect broad Paα emission (FWHM 1745 ± 40 km s-1), relatively bright continuum emission, and a continuum slope consistent with a reddened quasar spectrum (3.1 <Av <7.3), all emitted by an unresolved point source. Therefore we conclude that we have, indeed, detected a hidden quasar nucleus in PKS 1549-79. Combined with previous results, these observations are consistent with the idea that PKS 1549-79 is a young radio source in which the cocoon of debris left over from the triggering events has not yet been swept aside by circumnuclear outflows.

KW - Galaxies: active

KW - Galaxies: individual: PKS 1549-79

KW - Infrared: galaxies

KW - Quasars: emission lines

KW - Quasars: general

U2 - 10.1046/j.1365-8711.2003.07078.x

DO - 10.1046/j.1365-8711.2003.07078.x

M3 - Article

SN - 0035-8711

VL - 344

SP - L80-L84

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 4

ER -

Near-infrared spectroscopy of PKS 1549-79: A protoquasar revealed?

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