Paper from Thysanolaena maxima

Saikia, Debajit; Goswami, Tridip; Chaliha, Bithika

doi:10.1016/0960-8524(92)90150-v

Cited by 11 publications

(6 citation statements)

References 1 publication

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“…As mentioned above, Scheuer (1995) has argued that a much sharper interpretation of the Qdistribution is possible by invoking additional information, namely, the presence of the jet, which allows one to distinguish the approaching lobe/hot-spot from its receding counterpart. This clue was earlier employed by Saikia (1984), but his sample of 36 quasars did not show the expected trend; namely a statistical excess of the lobe-length on the jet side. Since the orientation dominated effects are likely to be stronger for highly luminous radio sources with their hot-spots advancing more rapidly, Scheuer has determined the lobe-length ratios for 3 essentially independent samples containing a total of 43 sources with conspicuous jets (including 41 quasars), above an emitted integrated luminosity of ∼ 10 27.5 W Hz −1 sr −1 at 178 MHz.…”

Section: Further Constraining the Hot-spot Speeds By The Jet-sidednessmentioning

confidence: 76%

“…In an early examination of orientation effects, a correlation between the two orientation dependent parameters, Q and the core-fraction, f c (the flux ratio of the radio core flux to total flux) was searched for using a set of 26 3CR sources with detected radio cores (Gopal-Krishna 1980). Subsequently, using larger samples of quasars, a weak but significant Q-f c correlation was found (e.g., Kapahi & Saikia 1982;Saikia 1984;Hough & Readhead 1989), though the effect has not been discerned in some other quasar samples (e.g., . Baryshev & Teerikorpi (1995) have analyzed the asymmetry properties of double RGs within the context of the unified scheme.…”

Section: Subtleties Of the Asymmetry Parameter Qmentioning

confidence: 99%

“…While such large hot-spot speeds conform to the estimates coming from the analysis of synchrotron ageing effects in the radio lobes in powerful sources at z ≥ 0.2 (e.g., Liu, Pooley & Riley 1992; also, Leahy, Muxlow & Stephens 1989), an analysis of the Q-distributions of quasars by Scheuer (1995), within the framework of the unified theory (which imposes a θ c ), has indicated that even for the most powerful sources, the hot-spot speeds are only a few percent of the speed of light. As discussed below ( §2.4), the extra clue employed by Scheuer is the apparent jet-sidedness, which can be used to identify the approaching and receding lobes (see, also, Saikia 1984). Thus, the origin of the substantially higher values of β obtained in the analysis of Best et al (1995) remain to be fully understood, particularly in view of their assertion that such high speeds are necessary to explain the observed contrast between the distributions of Q and Ψ for powerful RGs and quasars, within the framework of the unified scheme.…”

Section: Subtleties Of the Asymmetry Parameter Qmentioning

confidence: 99%

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Unified Schemes for Extragalactic Radio Sources

Gopal-Krishna

1996

Extragalactic Radio Sources

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My own suspicion is that the universe is not only queerer than we suppose, but queerer than we can suppose -J.B.S. Haldane OverviewThis review aims to provide the background and current perspective of some of the striking asymmetries exhibited by extragalactic double-lobed radio sources, paying special attention to the reported interrelationships among some of them. The asymmetries addressed here are related not only to the jets, and we particularly aim to highlight some less discussed aspects pertaining to the radio lobes and hot-spots for which any relativistic beaming effects are milder than those imposed on the jets. Various attributes of these features, such as their geometry, intensity, spectrum, and polarization provide important underpinnings to models of radio galaxies and quasars, as well as to theories that attempt to unify them. These constraints can be further sharpened by exploiting the more recently discovered asymmetry properties of the extended optical emission-line regions (EELR) associated with powerful radio sources, including the giant halos of Lyman-α emission associated with them. We suggest that highly extended disks of dusty gaseous material, which could also be parts of cosmic filaments, around the host galaxies of radio sources may hold the key to understanding some important types of asymmetries, namely, the correlated radio-optical asymmetry and perhaps also the depolarization asymmetry of the twin radio lobes.We also discuss the nature and possible implications of the extreme type of asymmetry witnessed in the enigmatic quasar 3C273, whose entire radio emission is observed on just one side of the nucleus. In this context, theoretical scenarios for the production of one-sided jets are also briefly recounted. Taking a clue from the observed one-sidedness of the extended radio jets even in 'weak-headedquasars', we also propose a scenario for the late evolutionary stage of double radio sources. We end by providing a list of key questions relating to radio source asymmetries which still require final answers.

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Section: Further Constraining the Hot-spot Speeds By The Jet-sidednessmentioning

confidence: 76%

Section: Subtleties Of the Asymmetry Parameter Qmentioning

confidence: 99%

Section: Subtleties Of the Asymmetry Parameter Qmentioning

confidence: 99%

See 1 more Smart Citation

Unified Schemes for Extragalactic Radio Sources

Gopal-Krishna

1996

Extragalactic Radio Sources

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“…Tiger Grass can be found at altitudes of up to 1800m all over India. The flowering season runs from March to June [9].…”

Section: Botanical Description and Taxonomymentioning

confidence: 99%

Thysanolaena maxima (roxb.) kuntze: a therapeutically less explored plant from northeastern India

Sharma¹,

Pandit²,

Pradhan³

et al. 2022

Journal of Applied Pharmaceutical Research

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Thysanolaena maxima is a member of the Poaceae family of medicinal plants, and it is used to cure a variety of ailments, including boils, vomiting, stomach disorders, and infectious diseases like tuberculosis. Thysanolaena maxima has been found to possess a variety of chemicals, including terpenoids, polysaccharides, tannins, flavonoids, saponins, glycosides, phenols, and steroids. The current mini-review analyses its pharmacological profile, chemical components, and phytochemistry, with an emphasis on, cytotoxic, antioxidant and antimicrobial properties, in order to better assess the plant's medicinal potential. Traditional and modern medicine, as well as possible herbal therapy for a number of ailments, have a lot of potential for Thysanolaena maxima. Its active ingredients and pharmacological activities is yet to be thoroughly researched. This brief review has offered up-to-date work on Thysanolaena maxima's phtyochemical and other information, which will serve as a reference for future research

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“…Shaikh et al ( 1992) successfully utilized linseed stalk for the fabrication of paper and twines. Saikia et al ( 1992) fabricated paper from waste grass stems generated by a local grass broom industry. Eminov et al ( 1991) applied the silica content from waste rice hulls to the manufacture of porcelain, while Vlasov et al ( 1991) investigated utilization of rice shell waste in the silicon carbide production industry.…”

Section: Reuse and Recyclementioning

confidence: 99%