Arnold Rots
Sherry Winkelman
& all past and present members of arcops
Outline
 The bibliographic database: description and usage
 Information about the mission
 Further development
 Collaborations and Seamless Astronomy
2012-10-10
CUC: Tracking Chandra Publications
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Bibliography: what’s in it?
 Article ID (“bibcode”)
 Category:





Presents observations
Refers to published results
Predicts Chandra results
Instrumentation, software, etc.
Cannot be classified
 Refereed?
 Publication date
 Data links to archive
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Bibliography: what’s in it (2)?
 Publication form

Article, erratum, memo, abstract, data
 Publication type

Journal, proceedings, thesis, circular, review, multi-media, etc.
 Instrument

ACIS, HRC, gratings, …, software, operations
 Associated subjects

Multi-wavelength, theory, follow-up
 Contributing observatories
 Journal keywords
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Database: population and maintenance




Weekly scan of ADS on key words in title or abstract
Candidate papers go into database
Distributed for review and classification to arcops
Review:
 Accept?
 If yes, classify
 Data links:
 If yes, find them
 Second review, if feasible
 Labor-intensive, but worth it
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Bibliographic Database
 Chandra science paper:
 Chandra observations have contributed significantly to
the scientific results of the paper


2012-10-10
Just used the position of a source detected by Chandra: NO
Analysis and interpretation of Chandra spectra from another
paper: YES
CUC: Tracking Chandra Publications
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Research with the Bibliography
 The bibliography was originally set up as a service to
our users by the CDA – it is first and foremost a
research tool, to be used in three ways:
 Links to publications while browsing the archive

WebChaser, Footprint Service
 Links to underlying data while browsing the literature

ADS
 Combined browsing


2012-10-10
http://cxc.harvard.edu/cgi-gen/cda/bibliography
http://labs.adsabs.harvard.edu/semantic/publications
CUC: Tracking Chandra Publications
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Dataset Ids and Bibliography
 Each ObsId’s Primary and Secondary data product






packages are assigned a DatasetID
Special DatasetIDs: groups of ObsIds or contrib. prods
Bibliography database links DatasetIDs with bibcodes
Mirrored to ADS
CDA resolves DatasetID URIs into URLs
Authors can insert DatasetIDs in manuscripts (please
do! it helps a lot); see AAS and CDA web pages
DSID-DSID links (between missions) are possible
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Links to Contributed Datasets
 Users are encouraged to contribute high-level data
products derived from Chandra data including, but
not limited to, images, graphs, tables in publications
 CDA will curate them in perpetuity
 They will be assigned DatsetIDs
 They can be linked to publications
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About the mission: metrics
 Traditional bibliometrics are problematic:
 Plain number of papers is of limited use; for instance,
the average number of observations used in a paper has
increased dramatically over the life of the mission
 Number of citations sensitive to self-citation – which
cannot be corrected for reliably
 Wealth of metadata in Chandra bibliography offers
opportunities for more meaningful metrics –
especially because of data-publication links
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How long till first publication?
600
Number of Observations
500
Median: 28 months
400
300
200
100
0
0
2012-10-10
1
2
3
4
5
6
Years
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7
8
9
10
11
12
11
Subsequent publications
700
Number of Observations
600
Median: 70 months
500
400
300
200
100
0
0
1
2
3
4
5
6
7
8
9
10
11
12
13
Years
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Percentage of Exposure Time Published
Published percentage of exposure time
100
80
60
No publications
1 publication
2 publications
40
3 publications
>3 publications
20
0
0
2012-10-10
1
2
3
4
5
6
7
Years in Archive
8
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10
11
12
13
Archive Proposals: First Publication
Number of Publications
20
15
10
5
0
0
2012-10-10
1
2
3
4
5
Years since Grant
CUC: Tracking Chandra Publications
6
7
8
14
Theory Proposals: First Publication
Number of Publications
15
10
5
0
0
2012-10-10
1
2
3
4
5
Years since Grant
CUC: Tracking Chandra Publications
6
7
8
15
Archive Proposals: Publications
Percentage of Proposals
100%
80%
60%
0 Papers
1 Paper
2 Papers
40%
3 Papers
4+ Papers
20%
0%
1
2012-10-10
2
3
4
5
6
7
Years Since Grant
CUC: Tracking Chandra Publications
8
9
10
11
16
Theory Proposals: Publications
Percentage of Proposals
100%
80%
60%
0 Papers
1 Paper
2 Papers
40%
3 Papers
4+ Papers
20%
0%
1
2012-10-10
2
3
4
5
6
7
Years Since Grant
CUC: Tracking Chandra Publications
8
9
10
11
17
Further Development
 Include press releases and image gallery
 Aggregate linking
 Full-text search: improve harvesting papers
 Extract grant numbers: tie in grants and proposals;
enhance coverage of archive and theory proposals
 More contributed datasets, integrate these sets
 Integrate with RSS feeds
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Future Collaborations
 Extended metadata extraction, integration of
ontologies, facilitation of semantic tools:
ADS AstroExplorer
 Text analysis:
extract more information from text flows than can
be obtained just from phrase matching
 SIMBAD/NED links to Fields of View
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