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Spatially resolved spectra of 3C galaxy nuclei
Astrophysics · Submitted 13 May 1998
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim These jets are bright and highly collimated only within a circumnuclear region of lower galaxy luminosity, which is not dusty.
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The abstract, sentence by sentence
We present and discuss visible-wavelength long-slit spectra of four low redshift 3C galaxies obtained with the STIS instrument on the Hubble Space Telescope. The slit was aligned with near-nuclear jet-like structure seen in HST images of the galaxies, to give unprecedented spatial resolution of the galaxy inner regions. In 3C 135 and 3C 171, the spectra reveal clumpy emission line structures that indicate outward motions of a few hundred km s$^{-1}$ within a centrally illuminated and ionised biconical region. There may also be some low-ionisation high-velocity material associated with 3C 135. In 3C 264 and 3C 78, the jets have blue featureless spectra consistent with their proposed synchrotron origin. There is weak associated line emission in the innermost part of the jets with mild outflow velocity. These jets are bright and highly collimated only within a circumnuclear region of lower galaxy luminosity, which is not dusty. We discuss the origins of these central regions and their connection with relativistic jets.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | We present and discuss visible-wavelength long-slit spectra of four low redshift 3C galaxies obtained with the STIS instrument on the Hubble Space Telescope. | contribution 0.90 | 0.97 | 0.04 | asserted 0.98 |
| s1 | The slit was aligned with near-nuclear jet-like structure seen in HST images of the galaxies, to give unprecedented spatial resolution of the galaxy inner regions. | method 0.99 | 0.89 | 0.04 | asserted 0.99 |
| s2 | In 3C 135 and 3C 171, the spectra reveal clumpy emission line structures that indicate outward motions of a few hundred km s$^{-1}$ within a centrally illuminated and ionised biconical region. | result 0.93 | 0.94 | 0.29 | hedged possibility 0.65 |
| s3 | There may also be some low-ionisation high-velocity material associated with 3C 135. | result 0.99 | 0.78 | 0.05 | hedged possibility 1.00 |
| s4 | In 3C 264 and 3C 78, the jets have blue featureless spectra consistent with their proposed synchrotron origin. | result 0.99 | 0.91 | 0.10 | asserted 0.53 |
| s5 | There is weak associated line emission in the innermost part of the jets with mild outflow velocity. | result 1.00 | 0.88 | 0.06 | asserted 1.00 |
| s6 | These jets are bright and highly collimated only within a circumnuclear region of lower galaxy luminosity, which is not dusty. | result 0.95 | 0.78 | 0.13 | asserted 1.00 |
| s7 | We discuss the origins of these central regions and their connection with relativistic jets. | interpretation 0.80 | 0.40 | 0.09 | unclear 0.92 |
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The paper
Original abstract
We present and discuss visible-wavelength long-slit spectra of four low redshift 3C galaxies obtained with the STIS instrument on the Hubble Space Telescope. The slit was aligned with near-nuclear jet-like structure seen in HST images of the galaxies, to give unprecedented spatial resolution of the galaxy inner regions. In 3C 135 and 3C 171, the spectra reveal clumpy emission line structures that indicate outward motions of a few hundred km s$^{-1}$ within a centrally illuminated and ionised biconical region. There may also be some low-ionisation high-velocity material associated with 3C 135. In 3C 264 and 3C 78, the jets have blue featureless spectra consistent with their proposed synchrotron origin. There is weak associated line emission in the innermost part of the jets with mild outflow velocity. These jets are bright and highly collimated only within a circumnuclear region of lower galaxy luminosity, which is not dusty. We discuss the origins of these central regions and their connection with relativistic jets.
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