The spectral energy distribution of the z = 3 quasar

HS 1946+7658

O. Kuhn, Jill Bechtold, R. Cutri, M. Elvis, Marcia J Rieke

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

For the bright z = 3.02 radio-quiet quasar, HS 1946+7658, we have obtained radio to X-ray data within the past year: 5 GHz and 1415 MHz data from the VLA; IR photometry at J, H, K, L′ (3.4 μm) and N; IR spectroscopy; UBVRI photometry; optical spectrophotometry and high-resolution spectra; and an X-ray spectrum from the ROSAT PSPC. The spectral energy distribution (SED) constructed from these data is compared to the mean SED for a set of low-redshift quasars, and while.they appear generally similar, there are several differences. In relation to the low-redshift mean, the SED of HS 1946+7658 shows (1) only an upper limit at 10 μm (a rest wavelength of 2.5 μm), indicating that HS 1946+7658 does not have a strong near-IR excess such as hot dust would produce; (2) relatively weak Fe II and Balmer continuum emission at ∼3000 Å; and (3) a steeper turndown shortward of Lyα, even after correction for the Lyα forest absorption lines.

Original languageEnglish (US)
Pages (from-to)643-649
Number of pages7
JournalAstrophysical Journal
Volume438
Issue number2
StatePublished - Jan 10 1995

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spectral energy distribution
quasars
photometry
radio
energy
spectrophotometry
x rays
dust
spectroscopy
continuums
wavelength
high resolution
wavelengths
distribution

Keywords

  • Radio continuum: galaxies
  • X-rays: galaxies

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

The spectral energy distribution of the z = 3 quasar : HS 1946+7658. / Kuhn, O.; Bechtold, Jill; Cutri, R.; Elvis, M.; Rieke, Marcia J.

In: Astrophysical Journal, Vol. 438, No. 2, 10.01.1995, p. 643-649.

Research output: Contribution to journalArticle

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abstract = "For the bright z = 3.02 radio-quiet quasar, HS 1946+7658, we have obtained radio to X-ray data within the past year: 5 GHz and 1415 MHz data from the VLA; IR photometry at J, H, K, L′ (3.4 μm) and N; IR spectroscopy; UBVRI photometry; optical spectrophotometry and high-resolution spectra; and an X-ray spectrum from the ROSAT PSPC. The spectral energy distribution (SED) constructed from these data is compared to the mean SED for a set of low-redshift quasars, and while.they appear generally similar, there are several differences. In relation to the low-redshift mean, the SED of HS 1946+7658 shows (1) only an upper limit at 10 μm (a rest wavelength of 2.5 μm), indicating that HS 1946+7658 does not have a strong near-IR excess such as hot dust would produce; (2) relatively weak Fe II and Balmer continuum emission at ∼3000 {\AA}; and (3) a steeper turndown shortward of Lyα, even after correction for the Lyα forest absorption lines.",
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T2 - HS 1946+7658

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AU - Bechtold, Jill

AU - Cutri, R.

AU - Elvis, M.

AU - Rieke, Marcia J

PY - 1995/1/10

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N2 - For the bright z = 3.02 radio-quiet quasar, HS 1946+7658, we have obtained radio to X-ray data within the past year: 5 GHz and 1415 MHz data from the VLA; IR photometry at J, H, K, L′ (3.4 μm) and N; IR spectroscopy; UBVRI photometry; optical spectrophotometry and high-resolution spectra; and an X-ray spectrum from the ROSAT PSPC. The spectral energy distribution (SED) constructed from these data is compared to the mean SED for a set of low-redshift quasars, and while.they appear generally similar, there are several differences. In relation to the low-redshift mean, the SED of HS 1946+7658 shows (1) only an upper limit at 10 μm (a rest wavelength of 2.5 μm), indicating that HS 1946+7658 does not have a strong near-IR excess such as hot dust would produce; (2) relatively weak Fe II and Balmer continuum emission at ∼3000 Å; and (3) a steeper turndown shortward of Lyα, even after correction for the Lyα forest absorption lines.

AB - For the bright z = 3.02 radio-quiet quasar, HS 1946+7658, we have obtained radio to X-ray data within the past year: 5 GHz and 1415 MHz data from the VLA; IR photometry at J, H, K, L′ (3.4 μm) and N; IR spectroscopy; UBVRI photometry; optical spectrophotometry and high-resolution spectra; and an X-ray spectrum from the ROSAT PSPC. The spectral energy distribution (SED) constructed from these data is compared to the mean SED for a set of low-redshift quasars, and while.they appear generally similar, there are several differences. In relation to the low-redshift mean, the SED of HS 1946+7658 shows (1) only an upper limit at 10 μm (a rest wavelength of 2.5 μm), indicating that HS 1946+7658 does not have a strong near-IR excess such as hot dust would produce; (2) relatively weak Fe II and Balmer continuum emission at ∼3000 Å; and (3) a steeper turndown shortward of Lyα, even after correction for the Lyα forest absorption lines.

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KW - X-rays: galaxies

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