Matches in SemOpenAlex for { <https://semopenalex.org/work/W2023003235> ?p ?o ?g. }
Showing items 1 to 65 of
65
with 100 items per page.
- W2023003235 endingPage "L35" @default.
- W2023003235 startingPage "L35" @default.
- W2023003235 abstract "view Abstract Citations (69) References (15) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Masering Torus in NGC 4258 Haschick, Aubrey D. ; Baan, Willem A. ; Peng, Eric W. Abstract The galaxy NGC 4258 displays strong spectral variability in its H_2_O maser emission during a 7 year monitoring program. Variations of line strength and line velocity are particularly prominent. A velocity-epoch diagram of prominent spectral features shows that all features are accelerated systematically with an effective rate of 7.5 km s^-1^ yr^-1^. Combining this result with a recent VLBI result of an angular gradient for the velocity, we find that the masering clouds are located at the inner edge of a molecular torus/disk or a ring at a radial distance of 0.11 pc and have a Keplerian velocity of 900 km s^-1^ around a 2.2 x 10^7^ M_sun_ nuclear mass. The masering clouds amplify the radio continuum during the 15 years it takes to pass in front of the extended (0.014 pc) nucleus. The pumping of the high density masering clouds does not directly result from the nuclear activity itself but rather from short-lived pump sources within the torus. Searches for periodic behavior have not revealed any incidences besides the one reported earlier. The observed high-velocity features in NGC 4258 originate in the tangential sections of the torus. Publication: The Astrophysical Journal Pub Date: December 1994 DOI: 10.1086/187676 Bibcode: 1994ApJ...437L..35H Keywords: Active Galactic Nuclei; Angular Velocity; Molecular Clouds; Toruses; Water Masers; Emission Spectra; Kinematics; Line Spectra; Red Shift; Stellar Luminosity; Very Long Base Interferometry; Astrophysics; GALAXIES: INDIVIDUAL NGC NUMBER: NGC 4258; GALAXIES: NUCLEI; GALAXIES: KINEMATICS AND DYNAMICS; MASERS full text sources ADS | data products SIMBAD (5) NED (1)" @default.
- W2023003235 created "2016-06-24" @default.
- W2023003235 creator A5062642543 @default.
- W2023003235 creator A5072266967 @default.
- W2023003235 creator A5090759453 @default.
- W2023003235 date "1994-12-01" @default.
- W2023003235 modified "2023-10-13" @default.
- W2023003235 title "The masering torus in NGC 4258" @default.
- W2023003235 doi "https://doi.org/10.1086/187676" @default.
- W2023003235 hasPublicationYear "1994" @default.
- W2023003235 type Work @default.
- W2023003235 sameAs 2023003235 @default.
- W2023003235 citedByCount "57" @default.
- W2023003235 countsByYear W20230032352012 @default.
- W2023003235 countsByYear W20230032352013 @default.
- W2023003235 countsByYear W20230032352016 @default.
- W2023003235 countsByYear W20230032352017 @default.
- W2023003235 countsByYear W20230032352018 @default.
- W2023003235 countsByYear W20230032352022 @default.
- W2023003235 crossrefType "journal-article" @default.
- W2023003235 hasAuthorship W2023003235A5062642543 @default.
- W2023003235 hasAuthorship W2023003235A5072266967 @default.
- W2023003235 hasAuthorship W2023003235A5090759453 @default.
- W2023003235 hasConcept C121332964 @default.
- W2023003235 hasConcept C1276947 @default.
- W2023003235 hasConcept C198352243 @default.
- W2023003235 hasConcept C2524010 @default.
- W2023003235 hasConcept C33923547 @default.
- W2023003235 hasConcept C43481613 @default.
- W2023003235 hasConcept C44870925 @default.
- W2023003235 hasConcept C46061668 @default.
- W2023003235 hasConcept C79896159 @default.
- W2023003235 hasConcept C9767117 @default.
- W2023003235 hasConcept C98444146 @default.
- W2023003235 hasConceptScore W2023003235C121332964 @default.
- W2023003235 hasConceptScore W2023003235C1276947 @default.
- W2023003235 hasConceptScore W2023003235C198352243 @default.
- W2023003235 hasConceptScore W2023003235C2524010 @default.
- W2023003235 hasConceptScore W2023003235C33923547 @default.
- W2023003235 hasConceptScore W2023003235C43481613 @default.
- W2023003235 hasConceptScore W2023003235C44870925 @default.
- W2023003235 hasConceptScore W2023003235C46061668 @default.
- W2023003235 hasConceptScore W2023003235C79896159 @default.
- W2023003235 hasConceptScore W2023003235C9767117 @default.
- W2023003235 hasConceptScore W2023003235C98444146 @default.
- W2023003235 hasLocation W20230032351 @default.
- W2023003235 hasOpenAccess W2023003235 @default.
- W2023003235 hasPrimaryLocation W20230032351 @default.
- W2023003235 hasRelatedWork W1672899537 @default.
- W2023003235 hasRelatedWork W1736016406 @default.
- W2023003235 hasRelatedWork W1993652163 @default.
- W2023003235 hasRelatedWork W2138548737 @default.
- W2023003235 hasRelatedWork W2154701545 @default.
- W2023003235 hasRelatedWork W2625331563 @default.
- W2023003235 hasRelatedWork W2943155809 @default.
- W2023003235 hasRelatedWork W3006725784 @default.
- W2023003235 hasRelatedWork W3100740287 @default.
- W2023003235 hasRelatedWork W4288359478 @default.
- W2023003235 hasVolume "437" @default.
- W2023003235 isParatext "false" @default.
- W2023003235 isRetracted "false" @default.
- W2023003235 magId "2023003235" @default.
- W2023003235 workType "article" @default.