1,726,297 research outputs found
Discovery and Characterization of ZTF J0112+5827: an 80.9-Minute Polar with Strong Cyclotron Features
No full textThis dataset includes spectral data associated with the research "Discovery and Characterization of ZTF J0112+5827: an 80.9-Minute Polar with Strong Cyclotron Features." It contains images of spectra obtained from different telescopes, each supplemented with phase information to support detailed analysis. - Emission_line.png: Phase-resolved spectroscopy of ZTF J0112+5827, captured with low-resolution spectra from the P200, illustrates the evolution of the Balmer emission lines over the orbital period. - spectraP200.png: The time-resolved spectra of ZTF J0112+5827 obtained with P200/DBSP displays 30 partial spectra over one cycle. The grey portion indicates the region where the red and blue spectra are stitched together, characterized by a relatively low signal-to-noise ratio. - spectraGTC.png: Four spectra of ZTF J0112+5827 obtained with OSIRIS/GTC. - spectra_fits.zip: A compressed file containing processed spectral data in FITS format, allowing researchers to utilize the source files for further examination and replication of the findings.Peer reviewe
Discovery and characterization of ZTF J0112+5827: An 80.9-minute polar with strong cyclotron features
No full textContext. A new X-ray Cataclysmic variable (CV) candidate exhibits distinct light-curve characteristics in the ZTF’s g, r, and i bands. The paper includes the optical identification and multiwavelength analysis of this CV candidate.
Aims. This work aims to determine if a previously identified CV candidate, ZTF J0112+5827, is a polar system by examining its X-ray and cyclotron radiation characteristics.
Methods. We characterized the X-ray emission of ZTF J0112+5827 using the ROSAT observations. The gri-band optical light curves were obtained from the Zwicky Transient Facility. After two nights of time-domain spectroscopic observations with the Palomar 200-inch telescope, we mapped the accretion structures using Doppler tomography.
Results. ZTF J0112+5827 exhibits an orbital period of 80.9 minutes, determined from the ZTF light curves, and an average X-ray flux of (68.4 ± 15.7)×10−14 erg s−1 cm−2 in the 0.1–2.4 keV range. It shows an ellipsoidal-like variability curve in the g band, with two prominent humps around phases of ∼0.0 and ∼0.7 in the i and r bands. In the spectra corresponding to these phases, a redward-increasing power-law continuum appears, which is accompanied by prominent features of cyclotron emission humps. Emission lines of He II and Balmer series were observed. The magnetic field strength of ZTF J0112+5827 was determined from the cyclotron harmonics. Its tomography map revealed the presence of accretion streams, but there was no evidence of an accretion disk structure. The line-of-sight velocity of the Balmer emission was measured at about 500 km s−1, the majority of which was contributed by accretion streams and accretion spots. Our result confirms that ZTF J0112+5827 is a polar system. It contains a magnetic white dwarf with a magnetic field strength of MG
Block Card 5827 Davida Drive
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: dwelling | 5827 Davida Drive (Toledo, Ohio) | Cape Cod Style | North Toledo (Toledo, Ohio) | Greenwood Area (Toledo, Ohio) | Davida Park (Toledo, Ohio
Analysis of LCO No. 5827
No full textTitle from Web page (publisher's Web site, viewed Oct. 4, 2011).; "May 19, 1995."; Discusses LCO 5827 (originally drafted as a proposed substitute for SB 327), which expands the type of misconduct that disqualifies a person from receiving unemployment compensation benefits, expands the definition of misconduct to include deliberate violation of a reasonable and uniformly enforced employer rule, increases penalties for unemployment compensation fraud, gives construction industry employees a higher benefit rate, gives the labor commissioner more administrative mechanisms for collecting unemployment compensation overpayments and conducting unemployment compensation hearings, and requires certain legislative reports.; Harvested from the web on 10/4/1
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe 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
Variations on the Author
No full text“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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