Lacerta

Definitions

  • WordNet 3.6
    • n Lacerta type genus of the Lacertidae
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Webster's Revised Unabridged Dictionary
    • n Lacerta A fathom.
    • Lacerta (Zoöl) A genus of lizards. See Lizard.
    • Lacerta (Astron) The Lizard, a northern constellation.
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Century Dictionary and Cyclopedia
    • n Lacerta In zoology, a genus of lizards, typical of the family Lacertidæ. The name has been used in senses almost as broad as those of Lacertæ or Lacertilia. As now restricted, it covers a large number of common harmless lizards of the Old World, and chiefly of its warmer parts, of active diurnal habits, living on the ground chiefly, with four well-developed limbs and movable eyelids. They are of slender form, with long slim tail and non-imbricated scales. L. agilis is the common gray lizard or sand lizard of England. L. viridis is the green lizard of southern Europe.
    • n Lacerta A small constellation which first appears in the “Prodromus Astronomiæ” of Hevelius, published in 1690. It is bounded by Cepheus, Cygnus, Pegasus, and Andromeda. Its brightest star is of the fourth magnitude.
    • n Lacerta A fathom.
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Chambers's Twentieth Century Dictionary
    • n Lacerta la-sėr′ta a genus of saurian reptiles, the name properly restricted to slender, active lizards
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Etymology

Webster's Revised Unabridged Dictionary
L. a lizard. See Lizard
Chambers's Twentieth Century Dictionary
L.

Usage

In literature:

Lacerta varia, White, Journal of a Voyage to New Holland, 253, t. 38.
"Narrative of a Survey of the Intertropical and Western Coasts of Australia] [Volume 2 of 2]" by Phillip Parker King
Lacerta taeniolata, Shaw Zool.
"Journals Of Two Expeditions Of Discovery In North-West And Western Australia, Vol. 2 (of 2)" by George Grey
Unius sese dominum fecisse lacertae.
"The Atlantic Monthly, Volume 16, No. 98, December, 1865" by Various
THE FROG, THE LACERTA VIRIDIS, AND THE TOAD.
"Zoological Mythology (Volume II)" by Angelo de Gubernatis
About one degree south-west of 7 is 5 Lacertae, a deep orange star with a blue companion in a fine field.
"Astronomical Curiosities" by J. Ellard Gore
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In science:

Thus, it is clear that, as hinted by previous observations (Gabuzda et al. 1999 and references therein), a sizeable fraction (∼ 30%) of sources in the K¨uhr & Schmidt (1990) sample of BL Lacertae ob jects have longitudinal magnetic fields in their VLBI jets.
Analysis of 6cm VLBI polarization observations of a complete sample of northern BL Lacertae Objects
The distribution extends to appreciably higher speeds than the distribution for the K¨uhr & Schmidt BL Lacertae ob jects shown in Fig. 13.
Analysis of 6cm VLBI polarization observations of a complete sample of northern BL Lacertae Objects
This paper completes analysis of our first-epoch observations of all sources in the complete sample of BL Lacertae ob jects defined by K¨uhr & Schmidt (1990).
Analysis of 6cm VLBI polarization observations of a complete sample of northern BL Lacertae Objects
The VLBI core polarizations of BL Lacertae ob jects are appreciable, with values typically ranging from ∼ 2 − 7%, and occasionally reaching values as high as ∼ 10%.
Analysis of 6cm VLBI polarization observations of a complete sample of northern BL Lacertae Objects
There is some evidence from the University of Michigan monitoring database that outbursts in BL Lacertae ob jects may be more frequent and well resolved than those in quasars, suggesting that BL Lac ob jects may generate new components more frequently (M.
Analysis of 6cm VLBI polarization observations of a complete sample of northern BL Lacertae Objects
Since the superluminal speeds observed in BL Lacertae objects are, on average, slower than those in quasars, it may be that the jet components of BL Lacertae ob jects spend more time in the unresolved core region before becoming detectable as distinct jet knots.
Analysis of 6cm VLBI polarization observations of a complete sample of northern BL Lacertae Objects
Thus, it could be that the dominant magnetic-field component in the VLBI jets of BL Lacertae ob jects is characteristically toroidal.
Analysis of 6cm VLBI polarization observations of a complete sample of northern BL Lacertae Objects
The characteristically modest superluminal speeds observed in the K¨uhr & Schmidt sources suggest that BL Lacertae ob jects differ from quasars in either the characteristic angles of their jets to the line of sight, or the characteristic intrinsic velocities of components in their jets, or both.
Analysis of 6cm VLBI polarization observations of a complete sample of northern BL Lacertae Objects
Therefore, if the intrinsic velocities in the two types of sources were essentially the same, the BL Lacertae ob jects could, in principle, have smaller apparent velocities if their jets were significantly further from or nearer to the line of sight than the jets in quasars.
Analysis of 6cm VLBI polarization observations of a complete sample of northern BL Lacertae Objects
Since BL Lacertae ob jects are obviously highly beamed sources (Kollgaard 1994, for example), it is not reasonable to suppose that their jets could typically be at significantly larger angles to the line of sight than those in quasars.
Analysis of 6cm VLBI polarization observations of a complete sample of northern BL Lacertae Objects
On the other hand, if their jets were significantly closer to the line of sight than quasar jets, we would expect BL Lacertae ob jects to be significantly more highly beamed than quasars, and there is no evidence for this (Ghisellini et al. 1993).
Analysis of 6cm VLBI polarization observations of a complete sample of northern BL Lacertae Objects
Thus, the most straightforward interpretation of the more modest superluminal speeds observed in the VLBI jets of BL Lacertae ob jects compared to quasars is that the intrinsic velocities in the BL Lac jets are lower.
Analysis of 6cm VLBI polarization observations of a complete sample of northern BL Lacertae Objects
All of the VHE blazars detected to date are relatively close-by with redshifts ranging from 0.031 to 0.129, and perhaps to 0.444; they are all members of the BL Lacertae blazar subclass (BL Lacs).
Extragalactic Sources of TeV Gamma Rays: A Summary
The paper (63) that reported the detection of BL Lacertae by EGRET also reported an upper limit at TeV energies from the Whipple group.
Extragalactic Sources of TeV Gamma Rays: A Summary
Blazars (quasars and BL Lacertae, or BL Lac, objects) are important objects that have strong and variable emission at most wavelengths where they are detected.
The Status of VHE Gamma-Ray Astronomy
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