Results 1 to 10 of about 1,090,152 (292)

Cosmological distance indicators [PDF]

Space Science Reviews, 2018
We review three distance measurement techniques beyond the local universe: (1) gravitational lens time delays, (2) baryon acoustic oscillation (BAO), and (3) HI intensity mapping.
A. Agnello, A. Eigenbrod, A. Goobar, A. Hojjati, A. Hojjati, A. More, A. Oscoz, A.G. Riess, A.M. Martin, A.S. Tagore, B.J. Brewer, C. Alcock, C. Grillo, C. Hazard, C. McCully, C. Vanderriest, C. Vuissoz, C. Vuissoz, C.D. Fassnacht, C.D. Fassnacht, C.D. Fassnacht, C.E. Rusu, C.L. Bennett, C.S. Kochanek, C.S. Kochanek, C.W. Morgan, D. Paraficz, D. Sluse, D. Walsh, D.A. Goldstein, D.A. Goldstein, D.H. Weinberg, D.J. Eisenstein, D.J. Eisenstein, E. Eulaers, E. Giannini, E. Jullo, E.E. Falco, E.O. Ofek, E.R. Switzer, F. Courbin, F. Courbin, F. Courbin, F.B. Abdalla, G. Dobler, G. Dobler, G. Efstathiou, G. Golse, G.C.F. Chen, H. Lin, H.J. Seo, H.J. Seo, I. Burud, I. Burud, I. Burud, I. Jee, I. Momcheva, J. Fohlmeister, J. Fohlmeister, J. Hjorth, J. Huchra, J. Lehar, J.R. Shaw, J.R. Shaw, J.W. Nightingale, K. Bandura, K. Liao, K.C. Wong, K.S. Dawson, K.W. Masui, K.W. Masui, L. Amendola, L. Anderson, L. Oldham, L.B. Newburgh, L.J. Hainline, L.L.R. Williams, L.V.E. Koopmans, L.V.E. Koopmans, L.V.E. Koopmans, L.V.E. Koopmans, M. Barnabè, M. Barnabè, M. Cappellari, M. Jauzac, M. Oguri, M. Oguri, M. Oguri, M. Schmidt, M. Sereno, M. Takada, M. Tegmark, M. Tegmark, M. Tewes, M. Tewes, M.A. Zwaan, M.J. Drinkwater, N. Cantale, N. Kaiser, N.A. Grogin, O. Wucknitz, P. Bull, P. Jakobsson, P. Magain, P. Magain, P. Saha, P. Schneider, P. Schneider, P. Schneider, P. Schneider, P. Young, P.A.R. Ade, P.J. Marshall, P.J.E. Peebles, P.L. Kelly, P.L. Kelly, P.L. Kelly, P.L. Schechter, R. Adam, R. Barkana, R. Blandford, R. Blandford, R. Fadely, R. Gavazzi, R. Kawamata, R. Kormann, R.B. Wayth, S. Birrer, S. Cole, S. Dye, S. Hilbert, S. Rathna Kumar, S. Rathna Kumar, S. Refsdal, S. Vegetti, S. Wallington, S. Wyithe, S.A. Rodney, S.H. Suyu, S.H. Suyu, S.H. Suyu, S.H. Suyu, S.H. Suyu, S.H. Suyu, S.H. Suyu, S.H. Suyu, S.J. Warren, S.S. Tie, T. Kundić, T. Matsubara, T. Okumura, T. Okumura, T. Treu, T.C. Chang, T.C. Chang, T.E. Collett, V. Bonvin, V. Bonvin, V.N. Shalyapin, W. Hu, W.L. Freedman, W.N. Colley, X. Fernández, Y. Xu, Y.W. Liao, Z.S. Greene, É. Aubourg   +166 more
core   +5 more sources

The development of accessibility indicators for distance learning programs [PDF]

Research in Learning Technology, 2006
A study was undertaken to explore program policies and practices related to the accessibility of American distance learning courses to qualified students with disabilities.
Sheryl Burgstahler
doaj   +4 more sources

Young and Intermediate-age Distance Indicators [PDF]

Space Science Reviews, 2017
Distance measurements beyond geometrical and semi-geometrical methods, rely mainly on standard candles. As the name suggests, these objects have known luminosities by virtue of their intrinsic proprieties and play a major role in our understanding of ...
A. Bhardwaj, A. Bhardwaj, A. Bhardwaj, A. Bressan, A. Gallenne, A. García-Varela, A. Nakagawa, A. Nakagawa, A. Nakagawa, A. Siebert, A. Udalski, A. Udalski, A.A. Cole, A.G. Riess, A.G. Riess, A.J. Cuesta, A.J. Monson, A.J. Monson, A.K. Dambis, A.M. Jacyszyn-Dobrzeniecka, B. Aringer, B. Paczyński, B. Schölkopf, B. Sesar, B. Westerlund, B. Zhang, B.F. Madore, B.L. Tatton, C. Alcock, C. Dvorkin, C. Min, C. Ngeow, C. Ngeow, C. Wegg, C.-C. Ngeow, C.-C. Ngeow, C.-C. Ngeow, C.-C. Ngeow, C.A. Haniff, C.D. Laney, C.D. Laney, C.G. Román-Zúñiga, C.W. McAlary, D. Graczyk, D. Huber, D. Minniti, D. Nyu, D. Stello, D. Stello, D.E. Knuth, D.J. Marshall, D.L. Nidever, E. Hubble, E. Kapakos, E. Puzeras, E.F. Schlafly, E.P. Hubble, ESA, F. Caputo, F. Leeuwen van, F. Leeuwen van, F. Leeuwen van, G. Bono, G. Bono, G. Bono, G. Bono, G. Bono, G. Fiorentino, G. Fiorentino, G. Marchi De, G. Pietrzyński, G. Pietrzyński, G. Pietrzyński, G.A. Tammann, G.F. Benedict, G.G. Fazio, G.H. Rieke, G.H. Rieke, G.M. Green, G.P. Benedetto di, G.R. Ricker, H. Kobayashi, H. Nakanishi, H. Rauer, H.-B. Yuan, H.R. Neilson, H.S. Leavitt, I. Soszyński, I. Soszyński, I. Soszyński, J. Bovy, J. Storm, J. Storm, J. Storm, J.-J. Ren, J.A. Cardelli, J.A. Rich, J.F. Koerwer, J.P. Beaulieu, J.P. Gardner, K. Fricke, K. Kusuno, K.A.G. Olsen, K.M. Flaherty, K.Z. Stanek, K.Z. Stanek, Kh.S. Rezaei, L. Girardi, L. Girardi, L. Girardi, L. Girardi, L. Inno, L. Inno, L. Inno, L.D. Matthews, L.D. Matthews, L.M. Macri, M. Marconi, M. Marconi, M. Marengo, M. Marengo, M. Marengo, M. Marengo, M. Romaniello, M. Salaris, M. Shintani, M. Wyman, M.-R.L. Cioni, M.A.C. Perryman, M.E.K. Williams, M.H. Pinsonneault, M.L. McCall, M.M. Phillips, M.S. Xiang, M.W. Feast, M.W. Feast, M.W. Feast, M.W. Werner, N. Kawaguchi, N. Matsunaga, N. Matsunaga, N. Matsunaga, N. Zacharias, N.E. Evans, N.L. Chapman, N.R. Evans, N.R. Simon, O. Bienaymé, O. Pejcha, O.L. Creevey, P. Barmby, P. Fouque, P. Fouqué, P. Kervella, P. Kervella, P. Whitelock, P.R. Wood, Planck Collaboration, R. Grijs de, R. Grijs de, R. Haschke, R. Haschke, R. Indebetouw, R. Kamohara, R.C. Kennicutt Jr., R.D. Cannon, R.E. Luck, R.I. Anderson, R.I. Anderson, R.M. Cutri, R.P. Martin, R.V. Jones, S. Bergh van den, S. Bilir, S. Kanbur, S. Nishiyama, S. Roeser, S. Rubele, S. Subramanian, S. Subramanian, S. Subramanian, S. Subramanian, S. Subramanian, S.C. Keller, S.D. Friedman, S.E. Persson, S.M. Andrievsky, T. Kamezaki, T. Kamezaki, T. Kamezaki, T. Kamezaki, T. Kurayama, T.G. Barnes, V. Ripepi, V. Scowcroft, V. Scowcroft, V. Scowcroft, V.M.R. Muggeo, V.R.M. Muggeo, W. Dehnen, W.H.T. Vlemmings, W.H.T. Vlemmings, W.L. Freedman, W.L. Freedman, W.L. Freedman, W.L. Freedman, W.L. Freedman, X.-W. Liu, Y. Asaki, Y. Huang, Y. Huang, Y. Ita, Y.K. Choi   +212 more
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Extreme Quasars as Distance Indicators in Cosmology [PDF]

Frontiers in Astronomy and Space Sciences, 2020
Quasars accreting matter at very high rates (known as extreme Population A [xA] quasars, possibly associated with super-Eddington accreting massive black holes) may provide a new class of distance indicators covering cosmic epochs from present day up to ...
Deborah Dultzin, Paola Marziani, J. A. de Diego, C. A. Negrete, Ascensión Del Olmo, Mary L. Martínez-Aldama, Mary L. Martínez-Aldama, Mauro D'Onofrio, Edi Bon, Natasa Bon, Giovanna M. Stirpe   +10 more
doaj   +5 more sources

RR Lyrae and Type II Cepheid Variables in Globular Clusters: Optical and Infrared Properties

Universe, 2022
Globular clusters are both primary fossils of galactic evolution and formation and are ideal laboratories for constraining the evolution of low-mass and metal-poor stars.
Anupam Bhardwaj
doaj   +1 more source

Miras as a distance indicator in the CSST, JWST, and Gaia era

Frontiers in Astronomy and Space Sciences, 2023
Mira variables are important distance indicators owing to the clear period–luminosity relation at infrared wavelengths. We have compiled a sample of 343 Galactic Miras selected from the American Association of Variable Star Observers database and Gaia ...
Yan Sun, Jingdong Zhang, Jingdong Zhang, Bo Zhang, Shuangjing Xu, Xiaofeng Mai, Xiaofeng Mai, Hao Ding, Wen Chen, Wen Chen, Shiming Wen   +10 more
doaj   +1 more source

Investigating the Relationship Between Urban form and Energy Consumption in Urban Settlements (Case Study: Qazvin City) [PDF]

برنامه‌ریزی توسعه شهری و منطقه‌ای, 2022
Due to global warming, increasing greenhouse gas emissions, and people's dependence on private cars, the need for more attention from urban experts to the impact of urban form indicators and economic and social indicators on energy consumption and ...
fateme ghorbani, Aliakbar Salaripour
doaj   +1 more source

Comparative Analysis of TRGBs (CATs) from Unsupervised, Multi-halo-field Measurements: Contrast is Key

The Astrophysical Journal, 2023
The tip of the red giant branch (TRGB) is an apparent discontinuity of the luminosity function (LF) due to the end of the red giant evolutionary phase and is used to measure distances in the local universe.
J. Wu, D. Scolnic, A. G. Riess, G. S. Anand, R. Beaton, S. Casertano, X. Ke, S. Li   +7 more
doaj   +1 more source

Astrophysical Distance Scale. VII. A Self-consistent, Multiwavelength Calibration of the Slopes and Relative Zero Points for the Run of Luminosity with the Color of Stars Defining the Tip of the Red Giant Branch

The Astronomical Journal, 2023
Given the recent successful launch of the James Webb Space Telescope, determining robust calibrations of the slopes and absolute magnitudes of the near- to mid-infrared tip of the red-giant branch (TRGB) will be essential to measuring precise ...
Barry F. Madore, Wendy L. Freedman, Kayla Owens   +2 more
doaj   +1 more source

Quantifying Uncertainties on the Tip of the Red Giant Branch Method

The Astronomical Journal, 2023
We present an extensive grid of numerical simulations quantifying the uncertainties in measurements of the tip of the red giant branch (TRGB). These simulations incorporate a luminosity function composed of 2 mag of red giant branch (RGB) stars leading ...
Barry F. Madore, Wendy L. Freedman, Kayla A. Owens, In Sung Jang   +3 more
doaj   +1 more source