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7 results on '"Budavári, Tamás"'

1. Optimal probabilistic catalogue matching for radio sources.

Author

Fan, Dongwei, Budavári, Tamás, Norris, Ray P, and Basu, Amitabh

Subjects
*RADIOS, *CATALOGS, *RADIO galaxies, *ALGORITHMS, *WAVELENGTHS, *EYE
Abstract

Cross-matching catalogues from radio surveys to catalogues of sources at other wavelengths is extremely hard, because radio sources are often extended, often consist of several spatially separated components, and often no radio component is coincident with the optical/infrared host galaxy. Traditionally, the cross-matching is done by eye, but this does not scale to the millions of radio sources expected from the next generation of radio surveys. We present an innovative automated procedure, using Bayesian hypothesis testing, that models trial radio-source morphologies with putative positions of the host galaxy. This new algorithm differs from an earlier version by allowing more complex radio-source morphologies, and performing a simultaneous fit over a large field. We show that this technique performs well in an unsupervised mode. [ABSTRACT FROM AUTHOR]

Published
2020
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2. The seventh data release of the sloan digital sky survey

Author

Abazajian, Kevork N, Adelman‐McCarthy, Jennifer K, AgYeros, Marcel A, Allam, Sahar S, Prieto, Carlos Allende, An, Deokkeun, Anderson, Kurt S J, Anderson, Scott F, Annis, James, Bahcall, Neta A, Bailer‐Jones, C A L, Barentine, J C, Bassett, Bruce A, Becker, Andrew C, Beers, Timothy C, Bell, Eric F, Belokurov, Vasily, Berlind, Andreas A, Berman, Eileen F, Bernardi, Mariangela, Bickerton, Steven J, Bizyaev, Dmitry, Blakeslee, John P, Blanton, Michael R, Bochanski, John J, Boroski, William N, Brewington, Howard J, Brinchmann, Jarle, Brinkmann, J, Brunner, Robert J, Budavári, Tamás, Carey, Larry N, Department of Astronomy, and Faculty of Science

Subjects
stars, spectroscopy, astrophysics, photometry, cosmology and astronomy, quasars, Astrophysics::Instrumentation and Methods for Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, calibration, equator, and information science, computing, galaxies, Astrophysics::Solar and Stellar Astrophysics, errors, charge-coupled devices, general and miscellaneous//mathematics, Astrophysics::Galaxy Astrophysics, catalogs, wavelengths
Abstract

This paper describes the Seventh Data Release of the Sloan Digital Sky Survey (SDSS), marking the completion of the original goals of the SDSS and the end of the phase known as SDSS-II. It includes 11, 663 deg2 of imaging data, with most of the ~2000 deg2 increment over the previous data release lying in regions of low Galactic latitude. The catalog contains five-band photometry for 357 million distinct objects. The survey also includes repeat photometry on a 120° long, 2fdg5 wide stripe along the celestial equator in the Southern Galactic Cap, with some regions covered by as many as 90 individual imaging runs. We include a co-addition of the best of these data, going roughly 2 mag fainter than the main survey over 250 deg2. The survey has completed spectroscopy over 9380 deg2 the spectroscopy is now complete over a large contiguous area of the Northern Galactic Cap, closing the gap that was present in previous data releases. There are over 1.6 million spectra in total, including 930, 000 galaxies, 120, 000 quasars, and 460, 000 stars. The data release includes improved stellar photometry at low Galactic latitude. The astrometry has all been recalibrated with the second version of the USNO CCD Astrograph Catalog, reducing the rms statistical errors at the bright end to 45 milliarcseconds per coordinate. We further quantify a systematic error in bright galaxy photometry due to poor sky determination ; this problem is less severe than previously reported for the majority of galaxies. Finally, we describe a series of improvements to the spectroscopic reductions, including better flat fielding and improved wavelength calibration at the blue end, better processing of objects with extremely strong narrow emission lines, and an improved determination of stellar metallicities.

Published
2009
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3. The sixth data release of the Sloan digital sky survey

Author

Adelman‐McCarthy, Jennifer K, AgYeros, Marcel A, Allam, Sahar S, Allende Prieto, Carlos, Anderson, Kurt S J, Anderson, Scott F, Annis, James, Bahcall, Neta A, Bailer‐Jones, C A L, Baldry, Ivan K, Barentine, J C, Bassett, Bruce A, Becker, Andrew C, Beers, Timothy C, Bell, Eric F, Berlind, Andreas A, Bernardi, Mariangela, Blanton, Michael R, Bochanski, John J, Boroski, William N, Brinchmann, Jarle, Brinkmann, J, Brunner, Robert J, Budavári, Tamás, Carliles, Samuel, Carr, Michael A, Castander, Francisco J, Cinabro, David, Cool, R J, Covey, Kevin R, Csabai, István, Cunha, Carlos E, Department of Astronomy, and Faculty of Science

Subjects
horizontal-branch stars, white-dwarfs, astrophysics, Astrophysics::Instrumentation and Methods for Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, system, sample selection, Article, stellar spectra, atlases, 1st data release, surveys, astronomy &, survey photometric, Astrophysics::Solar and Stellar Astrophysics, early-type galaxies, spectroscopic target selection, survey imaging data, Astrophysics::Galaxy Astrophysics, catalogs, galactic halo
Abstract

This paper describes the Sixth Data Release of the Sloan Digital Sky Survey. With this data release, the imaging of the northern Galactic cap is now complete. The survey contains images and parameters of roughly 287 million objects over 9583 deg2 , including scans over a large range of Galactic latitudes and longitudes. The survey also includes 1.27 million spectra of stars, galaxies, quasars, and blank sky (for sky subtraction) selected over 7425 deg2 . This release includes much more stellar spectroscopy than was available in previous data releases and also includes detailed estimates of stellar temperatures, gravities, and metallicities. The results of improved photometric calibration are now available, with uncertainties of roughly 1% in g, r, i, and z, and 2% in u, substantially better than the uncertainties in previous data releases. The spectra in this data release have improved wavelength and flux calibration, especially in the extreme blue and extreme red, leading to the qualitatively better determination of stellar types and radial velocities. The spectrophotometric fluxes are now tied to point-spread function magnitudes of stars rather than fiber magnitudes. This gives more robust results in the presence of seeing variations, but also implies a change in the spectrophotometric scale, which is now brighter by roughly 0.35 mag. Systematic errors in the velocity dispersions of galaxies have been fixed, and the results of two independent codes for determining spectral classifications and redshifts are made available. Additional spectral outputs are made available, including calibrated spectra from individual 15 minute exposures and the sky spectrum subtracted from each exposure. We also quantify a recently recognized underestimation of the brightnesses of galaxies of large angular extent due to poor sky subtraction; the bias can exceed 0.2 mag for galaxies brighter than r ¼ 14 mag.

Published
2008
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4. Calibrating photometric redshifts of luminous red galaxies.

Author

Padmanabhan, Nikhil, Budavári, Tamás, Schlegel, David J., Bridges, Terry, Brinkmann, Jonathan, Cannon, Russell, Connolly, Andrew J., Croom, Scott M., Csabai, István, Drinkwater, Michael, Eisenstein, Daniel J., Hewett, Paul C., Loveday, Jon, Nichol, Robert C., Pimbblet, Kevin A., De Propris, Roberto, Schneider, Donald P., Scranton, Ryan, Seljak, Uroš, and Shanks, Tom

Subjects
*REDSHIFT, *PHOTOMETRY, *SURVEYS, *CATALOGS, *GALAXIES, *ASTROPHYSICS
Abstract

We discuss the construction of a photometric redshift catalogue of luminous red galaxies (LRGs) from the Sloan Digital Sky Survey (SDSS), emphasizing the principal steps necessary for constructing such a catalogue: (i) photometrically selecting the sample, (ii) measuring photometric redshifts and their error distributions, and (iii) estimating the true redshift distribution. We compare two photometric redshift algorithms for these data and find that they give comparable results. Calibrating against the SDSS and SDSS–2dF (Two Degree Field) spectroscopic surveys, we find that the photometric redshift accuracy isfor redshifts less than 0.55 and worsens at higher redshift (∼ 0.06 for). These errors are caused by photometric scatter, as well as systematic errors in the templates, filter curves and photometric zero-points. We also parametrize the photometric redshift error distribution with a sum of Gaussians and use this model to deconvolve the errors from the measured photometric redshift distribution to estimate the true redshift distribution. We pay special attention to the stability of this deconvolution, regularizing the method with a prior on the smoothness of the true redshift distribution. The methods that we develop are applicable to general photometric redshift surveys. [ABSTRACT FROM AUTHOR]

Published
2005
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5. The Third Data Release of the Sloan Digital Sky Survey

Author

Abazajian, Kevork, Adelman-McCarthy, Jennifer K., Agüeros, Marcel A., Allam, Sahar S., Anderson, Kurt S. J., Anderson, Scott F., Annis, James, Bahcall, Neta A., Baldry, Ivan K., Bastian, Steven, Berlind, Andreas, Bernardi, Mariangela, Blanton, Michael R., Bochanski, John J. Jr., Boroski, William N., Brewington, Howard J., Briggs, John W., Brinkmann, J., Brunner, Robert J., Budavári, Tamás, Carey, Larry N., Castander, Francisco J., Connolly, A. J., Covey, Kevin R., Csabai, István, Dalcanton, Julianne J., Doi, Mamoru, Dong, Feng, Eisenstein, Daniel James, Evans, Michael L., Fan, Xiaohui, Finkbeiner, Douglas, Friedman, Scott D., Frieman, Joshua A., Fukugita, Masataka, Gillespie, Bruce, Glazebrook, Karl, Gray, Jim, Grebel, Eva K., Gunn, James E., Gurbani, Vijay K., Hall, Patrick B., Hamabe, Masaru, Harbeck, Daniel, Harris, Frederick H., Harris, Hugh C., Harvanek, Michael, Hawley, Suzanne L., Hayes, Jeffrey, Heckman, Timothy M., Hendry, John S., Hennessy, Gregory S., Hindsley, Robert B., Hogan, Craig J., Hogg, David W., Holmgren, Donald J., Holtzman, Jon A., Ichikawa, Shin-ichi, Ichikawa, Takashi, Ivezic, Zeljko, Jester, Sebastian, Johnston, David E., Jorgensen, Anders M., Juri?, Mario, Kent, Stephen M., Kleinman, S. J., Knapp, G. R., Kniazev, Alexei Yu., Kron, Richard G., Krzesinski, Jurek, Lamb, Donald Q., Lampeitl, Hubert, Lee, Brian C., Lin, Huan, Long, Daniel C., Loveday, Jon, Lupton, Robert H., Mannery, Ed, Margon, Bruce, Martínez-Delgado, David, Matsubara, Takahiko, McGehee, Peregrine M., McKay, Timothy A., Meiksin, Avery, Ménard, Brice, Munn, Jeffrey A., Nash, Thomas, Neilsen, Eric H. Jr., Newberg, Heidi Jo, Newman, Peter R., Nichol, Robert C., Nicinski, Tom, Nieto-Santisteban, Maria, Nitta, Atsuko, Okamura, Sadanori, O, William, Owen, Russell, Padmanabhan, Nikhil, Pauls, George, Peoples, John, Pier, Jeffrey R., Pope, Adrian C., Pourbaix, Dimitri, Quinn, Thomas R., Raddick, M. Jordan, Richards, Gordon T., Richmond, Michael W., Rix, Hans-Walter, Rockosi, Constance M., Schlegel, David J., Schneider, Donald P., Schroeder, Joshua, Scranton, Ryan, Sekiguchi, Maki, Sheldon, Erin, Shimasaku, Kazu, Silvestri, Nicole M., Smith, J. Allyn, Smol?i?, Vernesa, Snedden, Stephanie A., Stebbins, Albert, Stoughton, Chris, Strauss, Michael A., SubbaRao, Mark, Szalay, Alexander S., Szapudi, István, Szkody, Paula, Szokoly, Gyula P., Tegmark, Max, Teodoro, Luis, Thakar, Aniruddha R., Tremonti, Christy, Tucker, Douglas L., Uomoto, Alan, Vanden Berk, Daniel E., Vandenberg, Jan, Vogeley, Michael S., Voges, Wolfgang, Vogt, Nicole P., Walkowicz, Lucianne M., Wang, Shu-i, Weinberg, David H., West, Andrew A., White, Simon D. M., Wilhite, Brian C., Xu, Yongzhong, Yanny, Brian, Yasuda, Naoki, Yip, Ching-Wa, Yocum, D. R., York, Donald G., Zehavi, Idit, Zibetti, Stefano, and Zucker, Daniel B.

Subjects
atlases, catalogs, surveys
Abstract

This paper describes the Third Data Release of the Sloan Digital Sky Survey (SDSS). This release, containing data taken up through 2003 June, includes imaging data in five bands over 5282 deg2, photometric and astrometric catalogs of the 141 million objects detected in these imaging data, and spectra of 528,640 objects selected over 4188 deg2. The pipelines analyzing both images and spectroscopy are unchanged from those used in our Second Data Release., Astronomy

Published
2005
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6. The Second Data Release of the Sloan Digital Sky Survey

Author

Abazajian, Kevork, Adelman-McCarthy, Jennifer K., Agüeros, Marcel A., Allam, Sahar S., Anderson, Kurt, S. J., Anderson, Scott F., Annis, James, Bahcall, Neta A., Baldry, Ivan K., Bastian, Steven, Berlind, Andreas, Bernardi, Mariangela, Blanton, Michael R., Bochanski, John J. Jr., Boroski, William N., Briggs, John W., Brinkmann, J., Brunner, Robert J., Budavári, Tamás, Carey, Larry N., Carliles, Samuel, Castander, Francisco J., Connolly, A. J., Csabai, István, Doi, Mamoru, Dong, Feng, Eisenstein, Daniel James, Evans, Michael L., Fan, Xiaohui, Finkbeiner, Douglas, Friedman, Scott D., Frieman, Joshua A., Fukugita, Masataka, Gal, Roy R., Gillespie, Bruce, Glazebrook, Karl, Gray, Jim, Grebel, Eva K., Gunn, James E., Gurbani, Vijay K., Hall, Patrick B., Hamabe, Masaru, Harris, Frederick H., Harris, Hugh C., Harvanek, Michael, Heckman, Timothy M., Hendry, John S., Hennessy, Gregory S., Hindsley, Robert B., Hogan, Craig J., Hogg, David W., Holmgren, Donald J., Ichikawa, Shin-ichi, Ichikawa, Takashi, Ivezic, Zeljko, Jester, Sebastian, Johnston, David E., Jorgensen, Anders M., Kent, Stephen M., Kleinman, S. J., Knapp, G. R., Kniazev, Alexei Yu., Kron, Richard G., Krzesinski, Jurek, Kunszt, Peter Z., Kuropatkin, Nickolai, Lamb, Donald Q., Lampeitl, Hubert, Lee, Brian C., Leger, R. French, Li, Nolan, Lin, Huan, Loh, Yeong-Shang, Long, Daniel C., Loveday, Jon, Lupton, Robert H., Malik, Tanu, Margon, Bruce, Matsubara, Takahiko, McGehee, Peregrine M., McKay, Timothy A., Meiksin, Avery, Munn, Jeffrey A., Nakajima, Reiko, Nash, Thomas, Neilsen, Eric H. Jr., Newberg, Heidi Jo, Newman, Peter R., Nichol, Robert C., Nicinski, Tom, Nieto-Santisteban, Maria, Nitta, Atsuko, Okamura, Sadanori, O, William, Ostriker, Jeremiah P., Owen, Russell, Padmanabhan, Nikhil, Peoples, John, Pier, Jeffrey R., Pope, Adrian C., Quinn, Thomas R., Richards, Gordon T., Richmond, Michael W., Rix, Hans-Walter, Rockosi, Constance M., Schlegel, David J., Schneider, Donald P., Scranton, Ryan, Sekiguchi, Maki, Seljak, Uros, Sergey, Gary, Sesar, Branimir, Sheldon, Erin, Shimasaku, Kazu, Siegmund, Walter A., Silvestri, Nicole M., Smith, J. Allyn, Smolčić, Vernesa, Snedden, Stephanie A., Stebbins, Albert, Stoughton, Chris, Strauss, Michael A., SubbaRao, Mark, Szalay, Alexander S., Szapudi, István, Szkody, Paula, Szokoly, Gyula P., Tegmark, Max, Teodoro, Luis, Thakar, Aniruddha R., Tremonti, Christy, Tucker, Douglas L., Uomoto, Alan, Vanden Berk, Daniel E., Vandenberg, Jan, Vogeley, Michael S., Voges, Wolfgang, Vogt, Nicole P., Walkowicz, Lucianne M., Wang, Shu-i, Weinberg, David H., West, Andrew A., White, Simon D. M., Wilhite, Brian C., Xu, Yongzhong, Yanny, Brian, Yasuda, Naoki, Yip, Ching-Wa, Yocum, D. R., York, Donald G., Zehavi, Idit, Zibetti, Stefano, and Zucker, Daniel B.

Subjects
atlases, catalogs, surveys
Abstract

The Sloan Digital Sky Survey (SDSS) has validated and made publicly available its Second Data Release. This data release consists of 3324 deg2 of five-band (ugriz) imaging data with photometry for over 88 million unique objects, 367,360 spectra of galaxies, quasars, stars, and calibrating blank sky patches selected over 2627 deg2 of this area, and tables of measured parameters from these data. The imaging data reach a depth of r ≈ 22.2 (95% completeness limit for point sources) and are photometrically and astrometrically calibrated to 2% rms and 100 mas rms per coordinate, respectively. The imaging data have all been processed through a new version of the SDSS imaging pipeline, in which the most important improvement since the last data release is fixing an error in the model fits to each object. The result is that model magnitudes are now a good proxy for point-spread function magnitudes for point sources, and Petrosian magnitudes for extended sources. The spectroscopy extends from 3800 to 9200 Å at a resolution of 2000. The spectroscopic software now repairs a systematic error in the radial velocities of certain types of stars and has substantially improved spectrophotometry. All data included in the SDSS Early Data Release and First Data Release are reprocessed with the improved pipelines and included in the Second Data Release. Further characteristics of the data are described, as are the data products themselves and the tools for accessing them., Astronomy

Published
2004
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7. Sloan Digital Sky Survey Imaging of Low Galactic Latitude Fields: Technical Summary and Data Release

Author

Finkbeiner, Douglas, Padmanabhan, Nikhil, Schlegel, David J., Carr, Michael A., Gunn, James E., Rockosi, Constance M., Sekiguchi, Maki, Lupton, Robert H., Knapp, G. R., Ivezic, Zeljko, Blanton, Michael R., Hogg, David W., Adelman-McCarthy, Jennifer K., Annis, James, Hayes, Jeffrey, Kinney, Ellynne, Long, Daniel C., Seljak, Uros, Strauss, Michael A., Yanny, Brian, Agüeros, Marcel A., Allam, Sahar S., Anderson, Scott F., Bahcall, Neta A., Baldry, Ivan K., Bernardi, Mariangela, Boroski, William N., Briggs, John W., Brinkmann, J., Brunner, Robert J., Budavári, Tamás, Castander, Francisco J., Covey, Kevin R., Csabai, István, Doi, Mamoru, Dong, Feng, Eisenstein, Daniel James, Fan, Xiaohui, Friedman, Scott D., Fukugita, Masataka, Gillespie, Bruce, Grebel, Eva K., Gurbani, Vijay K., de Haas, Ernst, Harris, Frederick H., Hendry, John S., Hennessy, Gregory S., Jester, Sebastian, Johnston, David E., Jorgensen, Anders M., Juric, Mario, Kent, Stephen M., Kniazev, Alexei Yu., Krzesinski, Jurek, Leger, R. French, Lin, Huan, Loveday, Jon, Mannery, Ed, Martínez-Delgado, David, McGehee, Peregrine M., Meiksin, Avery, Munn, Jeffrey A., Neilsen, Eric H. Jr., Newman, Peter R., Nitta, Atsuko, Pauls, George, Quinn, Thomas R., Rafikov, R. R., Richards, Gordon T., Richmond, Michael W., Schneider, Donald P., Schroeder, Joshua, Shimasaku, Kazu, Siegmund, Walter A., Smith, J. Allyn, Snedden, Stephanie A., Stebbins, Albert, Szalay, Alexander S., Szokoly, Gyula P., Tegmark, Max, Tucker, Douglas L., Uomoto, Alan, Vanden Berk, Daniel E., Weinberg, David H., West, Andrew A., Yasuda, Naoki, Yocum, D. R., York, Donald G., and Zehavi, Idit

Subjects
atlases, catalogs, surveys
Abstract

The Sloan Digital Sky Survey (SDSS) mosaic camera and telescope have obtained five-band optical-wavelength imaging near the Galactic plane outside of the nominal survey boundaries. These additional data were obtained during commissioning and subsequent testing of the SDSS observing system, and they provide unique wide-area imaging data in regions of high obscuration and star formation, including numerous young stellar objects, Herbig-Haro objects, and young star clusters. Because these data are outside the survey regions in the Galactic caps, they are not part of the standard SDSS data releases. This paper presents imaging data for 832 square degrees of sky (including repeats), in the star-forming regions of Orion, Taurus, and Cygnus. About 470 deg2 are now released to the public, with the remainder to follow at the time of SDSS Data Release 4. The public data in Orion include the star-forming region NGC 2068/NGC 2071/HH 24 and a large part of Barnard's loop., Astronomy

Published
2004
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