R. Ptak

981 total citations
12 papers, 21 citations indexed

About

R. Ptak is a scholar working on Astronomy and Astrophysics, Instrumentation and Atomic and Molecular Physics, and Optics. According to data from OpenAlex, R. Ptak has authored 12 papers receiving a total of 21 indexed citations (citations by other indexed papers that have themselves been cited), including 11 papers in Astronomy and Astrophysics, 6 papers in Instrumentation and 4 papers in Atomic and Molecular Physics, and Optics. Recurrent topics in R. Ptak's work include Stellar, planetary, and galactic studies (7 papers), Astronomy and Astrophysical Research (6 papers) and Astrophysics and Star Formation Studies (3 papers). R. Ptak is often cited by papers focused on Stellar, planetary, and galactic studies (7 papers), Astronomy and Astrophysical Research (6 papers) and Astrophysics and Star Formation Studies (3 papers). R. Ptak collaborates with scholars based in United States. R. Ptak's co-authors include R. Stoner, D.J. Rowe and S. A. Gregory and has published in prestigious journals such as Nature, The Astrophysical Journal and American Journal of Physics.

In The Last Decade

R. Ptak

11 papers receiving 19 citations

Peers — A (Enhanced Table)

Peers by citation overlap · career bar shows stage (early→late) cites · hero ref

Name	h						Papers	Cites
R. Ptak United States	3	17	9	3	3	2	12	21
C. G. DARWIN	2	15 0.9×	10 1.1×	6 2.0×			4	24
C. J. Hogan United States	3	20 1.2×	8 0.9×	1 0.3×		3 1.5×	3	24
L. Gorn Switzerland	2	31 1.8×	5 0.6×		6 2.0×		3	32
R. Taylor Germany	2	20 1.2×	19 2.1×		3 1.0×		2	24
I. A. O. MacMillan United States	3	11 0.6×	13 1.4×	3 1.0×	2 0.7×		4	23
Joseph Schwarz Italy	3	37 2.2×	7 0.8×		3 1.0×		11	38
Y. Mino Japan	2	17 1.0×	3 0.3×	8 2.7×			2	18
R. D. Majka United States	3	12 0.7×	4 0.4×				4	27
M. Cavalli-Sforza United States	3	5 0.3×	4 0.4×		3 1.0×	2 1.0×	4	16
A. R. Walker South Africa	3	53 3.1×	4 0.4×	2 0.7×		8 4.0×	3	53

Countries citing papers authored by R. Ptak

Since Specialization

Citations

This map shows the geographic impact of R. Ptak's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by R. Ptak with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites R. Ptak more than expected).

Fields of papers citing papers by R. Ptak

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by R. Ptak. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by R. Ptak. The network helps show where R. Ptak may publish in the future.

Co-authorship network of co-authors of R. Ptak

This figure shows the co-authorship network connecting the top 25 collaborators of R. Ptak. A scholar is included among the top collaborators of R. Ptak based on the total number of citations received by their joint publications. Widths of edges represent the number of papers authors have co-authored together. Node borders signify the number of papers an author published with R. Ptak. R. Ptak is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

Sort: Min cites: Since: Top N: Style:

12 of 12 papers shown

1.

Stoner, R. & R. Ptak. (1985). Evidence for supermassive stars in three Seyfert galaxy nuclei from IUE spectra. The Astrophysical Journal. 297. 611–611. 1 indexed citations

2.

Stoner, R., R. Ptak, & S. A. Gregory. (1984). The variable component of the NGC 4151 IUE spectrum - Evidence for an expanding spherical emission shell. The Astrophysical Journal. 285. 69–69.

3.

Gregory, S. A., R. Ptak, & R. Stoner. (1982). C IV and Lyman-alpha emission lines in Seyfert 1 galaxies. The Astrophysical Journal. 261. 30–30. 1 indexed citations

4.

Rowe, D.J., R. Stoner, & R. Ptak. (1978). Cloud containment by a flux of particles. The Astrophysical Journal. 224. 761–761. 1 indexed citations

5.

Ptak, R. & R. Stoner. (1977). On dust as the source of the infrared luminosity of type 1 Seyfert galaxies. The Astrophysical Journal. 217. 940–940. 1 indexed citations

6.

Stoner, R. & R. Ptak. (1977). Comments on a paper by Katz regarding charge exchange models. The Astrophysical Journal. 214. 653–653. 1 indexed citations

7.

Ptak, R. & R. Stoner. (1976). On the interpretation of Fe II emission profiles in Seyfert galaxies and QSOs. The Astrophysical Journal. 210. 25–25. 1 indexed citations

8.

Ptak, R. & R. Stoner. (1975). The effect of suprathermal protons on the physical conditions in Seyfert galaxy nuclei. The Astrophysical Journal. 200. 558–558. 1 indexed citations

9.

Ptak, R. & R. Stoner. (1973). The Broad Component of Hα in the Seyfert Galaxy NGC 5548. The Astrophysical Journal. 179. L89–L89. 5 indexed citations

10.

Ptak, R. & R. Stoner. (1973). A Radially Streaming Proton Model for the Broad Component of Hydrogen Emission in Seyfert Galaxies. The Astrophysical Journal. 185. 121–121. 6 indexed citations

11.

Ptak, R. & R. Stoner. (1973). Origin of Broad Emission Lines from Quasistellar Objects. Nature. 243(5405). 280–280. 2 indexed citations

12.

Ptak, R. & R. Stoner. (1972). A Physics Survey Course with a Large Entropy. American Journal of Physics. 40(4). 611–614. 1 indexed citations

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

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