Publications

Kavan U. Ratnatunga

Richstone, D. O., Ratnatunga, K. U., & Schaeffer, J. 1980,
Carbon emission line profiles of high redshift Quasars,
Ap. J. 240 1-9. 1980ApJ...240....1R

Ratnatunga, K. U., 1982,
Investigation of the outer regions of the galactic halo,
Proc. Astr. Soc. of Australia 4 422-425. 1982PASAu...4..422R

Ratnatunga, K. U., & Freeman, K. C. 1983,
Objective prism Survey of the outer galactic halo,
IAU Coll. 78 Astronomy with Schmidt like Telescopes
ed. M. Capaccioli (Dordrecht: Reidel) p. 261-263. 1984astt.coll..261R

Freeman, K. C. & Ratnatunga, K. U., 1983,
The Galactic Constant V_o

Paltoglu, G., Wood P. R., Bessell M. S., & Ratnatunga, K. U. 1984,
A search for red variable stars in the LMC,
IAU symp. 108, Structure and evolution of the Magellanic Clouds
ed. S. van den Bergh, and K. S. de Boer (Dordrecht: Reidel) p. 219-220. 1984IAUS..108..219P

Ratnatunga, K. U. 1983,
Outer regions of the Galactic halo,
Ph.D. thesis Australian National University, Canberra.

Ratnatunga, K. U., & Newell, E. B. 1984,
The reduction of panoramic photometry III. An asymmetric clipping algorithm,
A. J. 89 176-184. 1984AJ.....89..176R

Bahcall, J. N., & Ratnatunga, K. U. 1985,
Comparison of the Standard Galaxy Model with Observations in two fields,
M. N. R. A. S. 213 39p-41p. 1985MNRAS.213P..39B

Ratnatunga, K. U., & Freeman, K. C. 1985,
Kinematics of K giants in the outer galactic halo.
Ap. J. 291 260-269. 1985ApJ...291..260R

Ratnatunga, K. U., & Bahcall, J. N. 1985,
Estimated Number of field stars towards Galactic globular clusters and local group galaxies,
Ap. J. Suppl. 59 63-76. 1985ApJS...59...63R

Bahcall, J. N., Ratnatunga, K. U., Buser, R., Fenkart, R. P., & Spaenhauer, A. 1985,
An analysis of the Basel Star Catalog,
Ap. J. 299 616-632. 1985ApJ...299..616B

Bahcall, J. N., Jones, B. F., & Ratnatunga, K. U. 1985,
Wide Binaries in the direction of Andromeda,
Ap. J. Suppl. 60 939-943. 1986ApJS...60..939B

Ratnatunga, K. U. 1986,
A similarity of halo field K giant population with globular cluster system of our Galaxy,
IAU symp. 126, Globular Cluster Systems in Galaxies
ed. J.E. Grindlay and A.G.D. Philip (Reidel:Dordrecht), p. 519-520. 1988IAUS..126..519R

Bahcall, J. N., Casertano, S., & Ratnatunga, K. U. 1987,
An Analysis of the Yale Bright Star Catalog,
Ap. J. 320 515-526. 1987ApJ...320..515B

Ratnatunga, K. U. 1988,
Distance independent Study of Moving Groups,
A. J. 95 1132-1148. 1988AJ.....95.1132R

Ratnatunga, K. U., Bahcall, J. N., & Casertano, S. 1989,
Kinematic Modeling of the Galaxy I. The Yale Bright Star Catalog,
Ap. J. 339 106-125. 1989ApJ...339..106R

Ratnatunga, K. U., & Freeman, K. C. 1989,
Field K giants in the Galactic Halo II,
Ap. J. 339 126-148. 1989ApJ...339..126R

Ratnatunga, K. U., & van den Bergh S. 1989,
The rate of Stellar Collapses in the Galaxy,
Ap. J. 343 713-717. 1989ApJ...343..713R

Ratnatunga, K. U. 1989,
Maximum likelihood number of density components in the Galaxy,
The Gravitational Force Perpendicular to the Galactic Plane
ed. A.G.D. Philip and P.K. Lu (L. Davis Press:Schenectady), p. 115-121. 1989gfpg.conf..115R

Ratnatunga, K. U. 1989,
Correction to Absolute Proper Motion using the IAS-Galaxy Model,
IAU Symp. 141, The Inertial coordinate system in the Sky
ed. J. Lieske and Abalakin V. K. (Kluwer:Dordrecht), p. 427-429. 1990IAUS..141..427R

Ratnatunga, K. U. 1990,
Comparison of GSC photometry in three Southern Fields,
A. J. 100 280-289. 1990AJ....100..280R

Casertano, S., Ratnatunga, K. U., & Bahcall, J. N. 1990,
Kinematic Modeling of the Galaxy II. Two samples of high Proper Motion stars,
Ap. J. 357 435-452. 1990ApJ...357..435C

Ratnatunga, K. U., & Warren, W. H. Jr. 1990,
Comparison of the FK5 Proper-Motion system with a kinematic distribution function,
IAU Coll. 127, Reference Systems
ed. J. A. Hughes and G. H. Kaplan (USNO:Washington), p. 335-338. 1991resy.coll..335R

Ratnatunga, K. U., & Casertano, S. 1991,
Absolute magnitude calibration using Trigonometric Parallax: Incomplete, Spectroscopic samples.
A. J. 101 1075-1088. 1991AJ....101.1075R

Ratnatunga, K. U., & Yoss, K. M. 1991,
Metalicity and Velocity distribution of Giants towards the Galactic Poles,
Ap. J. 377 442-461. 1991ApJ...377..442R

Ratnatunga, K. U. 1991,
Galactic Structure, Stellar Kinematics,
The Reference Encyclopedia of Astronomy and Astrophysics
ed. S.P. Maran (Robert Udell Asso. Inc.:New York), p. 224-227.

Casertano, S, & Ratnatunga, K. U. 1992,
Maximum Likelihood Analysis of Star Catalogs,
Astronomy from Large Databases, II
Eds A. Heck and F. Murtagh (Munich: ESO Conf. and Workshop Proc. no. 43), p. 219-224.

Ratnatunga, K. U., & Griffiths, R. 1992,
The HST Medium-Deep Survey Database,
Astronomy from Large Databases, II
Eds A. Heck and F. Murtagh (Munich: ESO Conf. and Workshop Proc. no. 43), p. 475-479.

Ratnatunga, K. U., & Casertano, S. 1992,
Galaxy Model Parameters using Numerical Maximum likelihood Estimation
Back to the Galaxy
Eds S. Holt and F. Verter (AIP: New York), p. 369-372.

Casertano, S, Bell, D. J., Ratnatunga, K. U., & Yoss, K. M. 1993,
The Quality of photometric information in the Hipparcos input catalog
A. J. 105 2344-2352. 1993AJ....105.2344C

Casertano, S, & Ratnatunga, K. U. 1993,
Application of Maximum Likelihood to the Analysis of Large Stellar Catalogs
Workshop on Databases for Galactic Structure
eds. A. G. D. Philip, B. Hauck and A. R. Upgren, p. 167-171.

Casertano, S, Lattanzi, M. G. & Ratnatunga, K. U. 1993,
Maximum Likelihood and the properties of Open Clusters
Workshop on Databases for Galactic Structure
eds. A. G. D. Philip, B. Hauck and A. R. Upgren, p. 227-231.

Ratnatunga, K. U., Griffiths, R. E., Casertano, S., Neuschaefer, L. W., & Wyckoff, E. W. 1993,
Calibration of HST wide field camera for quantitative analysis of faint galaxy images
Proc. Calibrating Hubble Space Telescope
eds. J. C. Blades and S. J. Osmer, p. 59-67.

Ratnatunga, K. U., Griffiths, R. E., & Casertano, S. 1994,
Maximum Likelihood Estimation of Galaxy Morphology: Faint HST Wide Field Camera Images
Proc. The Restoration of HST Images and Spectra II
eds. R. J. Hanish and R. L. White, p. 333-336.

Windhorst, R. A., Schmidtke, P. C., Pascarelle, S. M., Gordon, J. M., Griffiths, R. E., Ratnatunga, K. U., Neuschaefer, L. W., Ellis, R. S.,Gilmore, G., & Glazebrook, K. 1994,
Hubble Space Telescope Medium Deep Survey. 2: Deconvolution of Wide Field Camera field galaxy images in the 13h+43 field
A. J. 107 930-945. 1994AJ....107..930W

Mutz, S. B., Windhorst, R. A., Schmidtke, P. C., Pascarelle, S. M., Griffiths, R. E., Ratnatunga, K. U., Casertano, S., Im, M., Ellis, R. S.,Glazebrook, K., Green, R. F., & Sarajedini, V. L. 1994,
The Theta-z relation for HST bulges and disks out to z~0.8
Ap. J. 434 L55-L59. 1994ApJ...434L..55M

Griffiths, R. E.,Casertano, S., Ratnatunga, K. U., Neuschaefer, L. W., Ellis, R. S.,Gilmore, G. F., Glazebrook, K., Santiago, B., Huchra, J. P., Windhorst, R. A., Pascarelle, S. M., Green, R. F., Illingworth, G. D., Koo, D. C., & Tyson, A. J. 1994,
The morphology of faint galaxies in Medium Deep Survey images using WFPC2
Ap. J. 435 L19-L22. 1994ApJ...435L..19G

Ratnatunga, K. U., Griffiths, R. E., Casertano, S., Neuschaefer, L. W., & Wyckoff, E. W. 1994,
Calibration of HST wide field camera for quantitative analysis of faint galaxy images
A. J. 108 2362-2382. 1994AJ....108.2362R

Griffiths, R. E., Ratnatunga, K. U., Neuschaefer, L. W., Casertano, S., Im, M., Wyckoff, E. W., Ellis, R. S., Gilmore, G. F., Elson, R. A. W., Glazebrook, K., Schade, D. J., Windhorst, R. A., Schmidtke, P., Gordon, J., Pascarelle, S. M., Illingworth, G. D., Koo, D. C., Bershady, M. A., Forbes, D. A., Phillips, A. C., Green, R. F., Sarajedini, V., Huchra, J. P., & Tyson, J. A. 1994,
The Hubble Space Telescope Medium Deep Survey with the Wide Field and Planetary Camera. 1: Methodology and results on the field near 3C 273
Ap. J. 437 67-82. 1994ApJ...437...67G

Im, M., Casertano, S., Griffiths, R. E., Ratnatunga, K. U., & Tyson, J. A. 1995,
A test of galaxy evolutionary models via angular sizes
Ap. J. 441 494-504. 1995ApJ...441..494I

Im, M., Ratnatunga, K. U., Griffiths, R. E., & Casertano, S. 1995,
The axis ratio distribution of faint galaxies: Evidence for a population of dwarf galaxies at I~20.5
Ap. J. 445 L15-L19. 1995ApJ...445L..15I

Ratnatunga, K. U., Griffiths, R. E., Neuschaefer, L. W., & Ostrander, E. J. 1995,
Calibration of WFPC2 Images for the HST Medium Deep Survey
Proc. HST Calibration Workshop II
eds. A. Koratkar, A. and C. Leitherer, p. 351-359. 1995chst.conf..351R

Neuschaefer, L., Ratnatunga, K. U., Griffiths, R. E., & Valdes, F. 1995,
Detection, Photometry, and Completeness of FOCAS Catalogs for the HST Medium-Deep Survey
Pub. A.S.P. 107 590-599. 1995PASP..107..590N

Ratnatunga, K. U., Ostrander, E. J., Griffiths, R. E., & Im, M. 1995,
New 'Einstein Cross' Gravitational Lens Candidates in Hubble Space Telescope WFPC2 Survey Images

  • Clusters; lensing; and the future of the universe :
    ed. V. Trimble and A. Reisenegger, ASP Conf. Proc., 88 , p. 233- 1996clfu.conf..233R
  • IAU Symp. 173, Astrophysical Applications of Gravitational Lensing
    ed. C. S. Kochanel and J. N. Hewitt (IAU:Netherlands), p. 323-328. 1996IAUS..173..323R
  • Ap. J. 453 L5-L8, 1995ApJ...453L...5R astro-ph/9508131.

    Driver, S. P., Windhorst, R. A., Ostrander, E. J., Keel, W. C., Griffiths, R. E., & Ratnatunga, K. U. 1995,
    The Morphological Mix of Field Galaxies to m_I = 24.25 mag, b_J ~ 26 magnitudes) from a Deep Hubble Space Telescope WFPC2 Image
    Ap. J. Letters 449 L23-L27, 1995ApJ...449L..23D astro-ph/9511132.

    Neuschaefer, L. W., Ratnatunga, K. U., Griffiths, R. E., Casertano, S., & Im, M. 1995,
    Galaxy Clustering Statistics of Hubble Space Telescope Medium Deep Survey WF/PC Images
    Ap. J. 453 559-565. 1995ApJ...453..559N

    Casertano, S., Ratnatunga, K. U., Griffiths, R. E., Im, M., Neuschaefer, L. W., Ostrander, E. J., & Windhorst, R. A. 1995
    Structural Parameters of Faint Galaxies from Prerefurbishment Hubble Space Telescope Medium Deep Survey Observations
    Ap. J. 453 599-610. 1995ApJ...453..599C

    Griffiths, R. E., Ratnatunga, K. U., Im, M., Neuschaefer, L. W., Roche, N., Casertano, S., Ostrander, E. J., Ellis, R. S., Abraham, R., Glazebrook, K., Santiago, B., Gilmore, G. F., Green, R. F., Sarajedini, V., & Huchra, J. P. 1995,
    Cosmology with the HST Medium Deep Survey
    Proc. Science with the Hubble Space Telescope -- II
    eds. P. Benvenuti, F. D. Macchetto, and E. J. Schreier p. 119-128 1996shst.conf..119G

    Im, M., Griffiths, R. E., Ratnatunga, K. U., & Sarajedini, V. 1996,
    Luminosity Functions of Elliptical Galaxies at z < 1.2
    Ap. J. Letters 461 L91-L94. 1996ApJ...461L..79I astro-ph/9602041.

    Owens, E. A., Griffiths, R. E. & Ratnatunga, K. U. 1996,
    Using Oblique Decision trees for the Morphological Classification of Galaxies
    M. N. R. A. S. 281 153-157. 1996MNRAS.281..153O astro-ph/9603004

    Hershey, J. L., & Ratnatunga, K. U. 1996,
    Galactic Model Comparisons with the HST Guide Star Catalog
    P. A. S. P. 108 695-698. 1996PASP..108..695H

    Griffiths, R. E., Casertano, S., Im, M., & Ratnatunga, K. U. 1996,
    Weak Gravitational Lensing around Field Galaxies in HST Survey Images
    M. N. R. A. S. 282 1159-1164. 1996MNRAS.282.1159G astro-ph/9605109.

    Roche, N., Ratnatunga, K. U., Griffiths, R. E., Im, M. & Neuschaefer, L. W. 1996,
    Angular Sizes and Luminosity Evolution of faint galaxies
    M. N. R. A. S. 282 1247-1273. 1996MNRAS.282.1247R

    Sarajedini, V., Green, R. F., Griffiths, R. E., & Ratnatunga, K. U. 1996,
    Compact Nuclei in Moderately Redshifted Galaxies
    Ap. J. Letters 471 L15-L18. 1996ApJ...471L..15S astro-ph/9608180

    Im, M., Griffiths, R. E., & Ratnatunga, K. U. 1997,
    A Measurement of the Cosmological Constant Using Elliptical Galaxies as Strong Gravitational Lenses
    Ap. J. 475 457-461 . 1997ApJ...475..457I astro-ph/9611105

    Naim, A., Ratnatunga, K. U., & Griffiths, R. E. 1997,
    Quantitative Morphology of Moderate Redshift Galaxies: How many peculiars are there ?
    Ap. J. 476 510-520 . 1997ApJ...476..510N astro-ph/9609075

    Ratnatunga, K. U., & Upgren, A. R. 1997,
    Kinematics of Common Dwarf Stars: A Maximum Likelihood Analysis.
    Ap. J. 476 811-828 . 1997ApJ...476..811R

    Neuschaefer, L. W., Im, M., Ratnatunga, K. U., Griffiths, R. E., & Casertano, S. 1997,
    Evidence for Galaxy Interactions Mergers from HST Medium Deep Survey WFPC2 Data.
    Ap. J. 480 59-71 . 1997ApJ...480...59N astro-ph/9609090

    Roche, N., Ratnatunga, K. U., Griffiths, R. E., Im, M. & Neuschaefer, L. W. 1997,
    Angular Sizes of the Faint Blue Galaxies.
    M. N. R. A. S. 288 200-220. 1997MNRAS.288..200R

    Naim, A., Ratnatunga, K. U., & Griffiths, R. E. 1997,
    Galaxy Morphology without classification: Self Organizing Maps.
    Ap. J. S. 111 357-367 . 1997ApJS..111..357N astro-ph/9704012

    Ratnatunga, K. U., Ostrander, E. J. & Griffiths, R. E. 1997,
    Calibrating the WFPC2 Astrometry for MDS
    Proc. The 1997 HST Calibration Workshop
    eds. S. Casertano, R. Jedrzejewski, T. Keyes, and M. Stevens, p. 361-367. 1997hstc.work..361R.

    Roche, N., Ratnatunga, K. U., Griffiths, R. E., Im, M. & Neuschaefer, L. W. 1997,
    Galaxy surface brightness and size evolution to z~4.
    M. N. R. A. S. 293 157-176. 1998MNRAS.293..157R

    Tyson J. A., Fischer, P., Guhathakurta, P., Mcilroy, P., Wenk, R., Huchra, J., Macri, L., Neuschaefer, L., Sarajedini, V., Glazebrook, K., Ratnatunga, K. & Griffiths, R. 1998,
    Deep Optical Imaging of the Bright Seyfert Galaxy NGC 5548: a long, very low Surface Brightness Tail.
    A. J. 116 102-110 . 1998AJ....116..102T

    Lubin, L. M., Postman, M., Oke, J. B., Ratnatunga, K. U., Gunn, J. E., Hoessel, J. G., & Schneider, D. P. 1998,
    A Study of Nine High-Redshift Clusters of Galaxies. III. Hubble Space Telescope Morphology of Clusters 0023+0423 and 1604+4304.
    A. J. 116 584-622 . 1998AJ....116..584L astro-ph/9804286

    Ostrander, E. J., Nichol, R. C., Ratnatunga, K. U., & Griffiths, R. E. 1998,
    The HST MDS Cluster Sample: methodology and Data.
    A. J. 116 2644-2658 . 1998AJ....116.2644O astro-ph/9808304

    Im, M., Griffiths, R. E., Naim, A., Ratnatunga, K. U., Green, R. F. & Sarajedini, V. L. 1999,
    The Morphologically Divided Redshift Distribution of Faint Galaxies
    Ap. J. 510 82-89 . 1999ApJ...510...82I astro-ph/9901424

    Casertano, S., Ratnatunga, K. U. 1998,
    Populating the HR Diagram with the Hipparcos Catalogue
    Proc. Harmonizing Cosmic Distances in a Post-Hipparcos Era
    eds D. Egret and A. Heck, p. 101 STScI/1316

    Sarajedini, V., Green, R. F., Griffiths, R. E., & Ratnatunga, K. U. 1999,
    I. Compact Nuclei in Galaxies at Moderate Redshift: Imaging and Spectroscopy.
    Ap. J. S. 121 417-444 . 1999ApJ...514..746S astro-ph/9811292

    Sarajedini, V., Green, R. F., Griffiths, R. E., & Ratnatunga, K. U. 1999,
    II. Compact Nuclei in Galaxies at Moderate Redshift: Their Nature and Implications for the AGN Luminosity Function.
    Ap. J. 514 746-764 . 1999ApJS..121..417S astro-ph/9811295

    Ratnatunga, K. U., Griffiths, R. E. & Ostrander, E. J. 1999,
    The Top Ten List of Gravitational Lens Candidates from the HST Medium Deep Survey
    A. J. 117 2010-2023 . 1999AJ....117.2010R astro-ph/9902100

    Ratnatunga, K. U., Griffiths, R. E. & Ostrander, E. J. 1999,
    Disk and Bulge Morphology of WFPC2 galaxies: The HST Medium Deep Survey database
    A. J. 118 86-107 . 1999AJ....118...86R astro-ph/9904179

    Ratnatunga, K. U.,& Griffiths, R. E. 1999
    Surface brightness analysis of HST WFPC2 galaxies
    AAS 1999AAS...194.0705R

    Casertano, S., Ratnatunga, K. U., & Griffiths, R. E. 1999,
    The mass distribution of field galaxies from weak gravitational lensing
    Proc. Gravitational Lensing: Recent Progress and Future Goals,
    eds: T. G. Brainerd and C. S. Kochanek. p. 387-390 2001glrp.conf..387C

    Ratnatunga, K. U., Griffiths, R. E. & Knudson A. 1999
    Detection of Gravitational Lens Candidates in HST WFPC2 Data
    Proc. Gravitational Lensing: Recent Progress and Future Goals,
    eds: T. G. Brainerd and C. S. Kochanek. p. 33-36 2001glrp.conf...33R

    Ratnatunga, K. U., 2000
    Astronomy Research via the Internet
    Proc. IAU, Special Session on Astronomy from Developing Countries
    ed. Alan H. Batten 2000IAUSS..24E..28R HTML-version

    Knudson A., Ratnatunga, K. U. & Griffiths, R. E. 2001
    Investigation of Gravitational Lens Mass Models.
    A. J. 122 , 103-112 2001AJ....122..103K 2001astro.ph..4123K astro-ph/0104123

    Ratnatunga, K. U. 2002,
    Statistical Analysis of ACS data without Covariance in Errors.
    Proc.2002 HST Calibration Workshop
    eds. S. Arribas, A. Koekemoer, and B. Whitmore, in press. . .

    Casertano, S., Ratnatunga, K. U., & Griffiths, R. E. 2003,
    Cosmic Gravitational Shear from the Hubble Space Telescope Medium Deep Survey
    Ap. J. 598 L71-L74, 2003ApJ...598L..71C astro-ph/0311328.

    Subset from refereed journal in ADS - astro-ph - UCP - AAS

    Selected conference Proceedings via ADS

    Online Editions AJ - ApJ - PASP - MNRAS
    Query Forms ADS - author - astro-ph - UCP - AAS - ADS:article

    HOME