1,732,355 research outputs found
K.2244+
No full textK.2244 + K.4117 (+) K.3891 + K.9807 + K.10198 (+) K.6884 (+) K.11964
Photographs by the Shumma alu team (FNS projects nos. 175970 and 205122
Vaticanus graecus 2244 – H
No full textThis article provides a codicological and historical description of the manuscript Vaticanus graecus 2244, containing the text of Pollux’s Onomasticon
Ms. 2244
No full textSiglos XV-XVI. - Texto en catalán y castellano. - 210 f.; papel; 260x190 mm; letra redonda de libros de dos manos principales; enc. pasta española, tej.: POESIAS DE AUSIAS Y MENA, corte: MENA MARC.- faltan algunos folios Iniciales caligráficas para cada estrofa. - Olim: Bart. 241; Pal. VII-H-3, 2-H-4, 950.Manuscrito número 2244 de la Biblioteca Histórica de la USAL
Mass segregation in very young open clusters: A case study of NGC 2244 and NGC 6530
No full textWe derive the proper motions, membership probabilities, and velocity dispersions of stars in the regions of the young (similar to 2 - 4 Myr old) open clusters NGC 2244 ( the central cluster in the Monoceros R2 association) and NGC 6530 ( the dominant cluster in the Sgr OB1 association) from photographic plate material obtained at Shanghai Astronomical Observatory, with time baselines of 34 and 87 yr, respectively. Both clusters show clear evidence of mass segregation, but they do not exhibit any significant velocity- mass ( or, equivalently, velocity- luminosity) dependence. This provides strong support for the suggestion that the observed mass segregation is at least partially due to the way in which star formation has proceeded in these complex star- forming regions ("primordial'' mass segregation). Based on arguments related to the clusters' published initial mass functions, in conjunction with our new measurements of their internal velocity dispersions (similar to 35 and 8 km s(-1) for NGC 2244 and NGC 6530, respectively), we provide strong arguments in favor of the dissolution of NGC 2244 on very short timescales, while we speculate that NGC 6530 may be more stable against the effects of internal two- body relaxation. However, this latter object may well be destroyed by the strong tidal field prevalent at its location in the Galactic plane in the direction of the Galactic center
Block Card 2244 Upton Avenue
No full textThis image was produced by the Auditor's Office in Lucas County, Ohio for tax assessment purposes. Associated dates are approximate. Descriptive terms related to this photograph include: 2244 Upton Avenue (Toledo, Ohio) | Kellys Addition to Auburndale (Toledo, Ohio) | Auburndale Area (Toledo, Ohio) | Folk House Style | Cross gabled | Dwellin
Stellar population of the Rosette Nebula and NGC 2244
Get PDFContext. Measurements of internal dynamics of young clusters and star-forming regions are crucial to fully understand the process of their formation. A basic prerequisite for this is a well-established and robust list of probable members.
Aims. In this work, we study the 2.8° ×2.6° region in the emblematic Rosette Nebula, centred in the young cluster NGC 2244, with the aim of constructing the most reliable candidate member list to date. Using the obtained catalogue, we can determine various structural and kinematic parameters, which can help to draw conclusions about the past and the future of the region.
Methods. We constructed a catalogue containing optical to mid-infrared photometry, as well as accurate positions and proper motions from Gaia EDR3 for the sources in the field of the Rosette Nebula. We applied the probabilistic random forest algorithm to derive the membership probability for each source within our field of view. Based on the list of almost 3000 probable members, of which about a third are concentrated within the radius of 20′ from the centre of NGC 2244, we identified various clustered sources and stellar concentrations in the region, and estimated the average distance to the entire region at 1489 ± 37 pc, 1440 ± 32 pc to NGC 2244, and 1525 ± 36 pc to NGC 2237. The masses, extinction, and ages were derived by fitting the spectral energy distribution to the atmosphere and evolutionary models, and the internal dynamic was assessed via proper motions relative to the mean proper motion of NGC 2244.
Results. NGC 2244 is showing a clear expansion pattern, with an expansion velocity that increases with radius. Its initial mass function (IMF) is well represented by two power laws (dN/dM ∝ M−α), with slopes α = 1.05 ± 0.02 for the mass range 0.2–1.5 M⊙ and α = 2.3 ± 0.3 for the mass range 1.5–20 M⊙, and it is in agreement with slopes detected in other star-forming regions. The mean age of the region, derived from the HR diagram, is ∼2 Myr. We find evidence for the difference in ages between NGC 2244 and the region associated with the molecular cloud, which appears slightly younger. The velocity dispersion of NGC 2244 is well above the virial velocity dispersion derived from the total mass (1000 ± 70 M⊙) and half-mass radius (3.4 ± 0.2 pc). From the comparison to other clusters and to numerical simulations, we conclude that NGC 2244 may be unbound and that it possibly may have even formed in a super-virial state
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Block Card 2244 Bachelor Lane
No full textThis image was produced by the Auditor's Office in Lucas County, Ohio for tax assessment purposes. Associated dates are approximate. Descriptive terms related to this photograph include: Italianate Style | 2244 Bachelor Lane (Toledo, Ohio) | apartment houses | Gretna Green Addition (Toledo, Ohio) | Auburndale Area (Toledo, Ohio
Block Card 2244 Ward Street
No full textThis image was produced by the Auditor's Office in Lucas County, Ohio for tax assessment purposes. Associated dates are approximate. Descriptive terms related to this photograph include: 2244 Ward Street (Toledo, Ohio) | Dwelling | Danberry Heights Addition (Toledo, Ohio) | Modern Colonial Styl
- …
