Article
Astronomy & Astrophysics
Anthony Carr, Tamara M. Davis, Dan Scolnic, Khaled Said, Dillon Brout, Erik R. Peterson, Richard Kessler
Summary: We examine the redshifts of Type Ia supernovae and provide an updated catalogue with improved redshift values. Through using the latest heliocentric redshift data, exact formulae for converting to the Cosmic Microwave Background frame, and an improved peculiar velocity model, we have enhanced the original catalogues. We found and corrected several errors and missing values. The impact of these improvements on measurements of H-0 and the dark energy equation of state w are smaller than previously reported uncertainties.
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF AUSTRALIA
(2022)
Article
Astronomy & Astrophysics
Yehuda Hoffman, Adi Nusser, Aurelien Valade, Noam Libeskind, R. Brent Tully
Summary: Studies have shown that surveys of galaxy distances and radial peculiar velocities can be used to reconstruct large-scale structures. The main source of uncertainties in these data comes from errors in distance moduli. Correction for lognormal bias can help in eliminating spurious nearby outflow and strong infall, leading to more accurate estimation of galaxy data.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Ben Henghes, Jeyan Thiyagalingam, Connor Pettitt, Tony Hey, Ofer Lahav
Summary: The researchers compared deep learning methods with traditional machine learning algorithms for photometric redshift estimation and introduced a mixed-input model to improve the accuracy of redshift estimation. In the tests, the mixed-input inception CNN outperformed the traditional random forest algorithm, especially at lower redshifts.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Richard Watkins, Trey Allen, Collin James Bradford, Albert Ramon Jr, Alexandra Walker, Hume A. Feldman, Rachel Cionitti, Yara Al-Shorman, Ehsan Kourkchi, R. Brent Tully
Summary: We estimated the bulk flow in a volume of radii 150-200 h(-1) Mpc using the minimum variance method with data from the CosmicFlows-4 (CF4) catalogue. The addition of new data in the CF4 increased the estimate of the bulk flow in a sphere of radius 150 h(-1) Mpc compared to the CosmicFlows-3 (CF3). The bulk flow in CF4 has a low probability of occurring in the standard cosmological model, and on scales of 200 h(-1) Mpc, it is in even greater tension with the standard model.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Simon C-C Ho, Tomotsugu Goto, Nagisa Oi, Seong Jin Kim, Matthew A. Malkan, Agnieszka Pollo, Tetsuya Hashimoto, Yoshiki Toba, Helen K. Kim, Ho Seong Hwang, Hyunjin Shim, Ting-Chi Huang, Eunbin Kim, Ting-Wen Wang, Daryl Joe D. Santos, Hideo Matsuhara
Summary: The AKARI space infrared telescope conducted near to mid-infrared observations in the NEPW field for about a year, but the lack of deep and homogeneous optical data limited the use of nearly half of the IR sources for extragalactic studies.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Jarle Brinchmann
Summary: I analyzed the JWST NIRSpec data of SMACS 0723 and provided three new redshifts, bringing the total reliable redshifts to 14. I proposed a modified direct abundance determination method that reduces sensitivity to flux calibration uncertainties by a factor of about 3 and showed that the resulting abundances are consistent with Bayesian photoionization models. I identified a narrow-line active galactic nucleus (AGN) at z = 7.66 and suggested the possibility of AGN contribution to the flux of another object at 10 612 through comparison with photoionization models and low-redshift analogues.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
R. Saglia, S. De Nicola, M. Fabricius, V Guglielmo, J. Snigula, R. Zoeller, R. Bender, J. Heidt, D. Masters, D. Stern, S. Paltani, A. Amara, N. Auricchio, M. Baldi, C. Bodendorf, D. Bonino, E. Branchini, M. Brescia, J. Brinchmann, S. Camera, V Capobianco, C. Carbone, J. Carretero, M. Castellano, S. Cavuoti, R. Cledassou, G. Congedo, C. J. Conselice, L. Conversi, Y. Copin, L. Corcione, F. Courbin, M. Cropper, A. Da Silva, H. Degaudenzi, M. Douspis, F. Dubath, C. A. J. Duncan, X. Dupac, S. Dusini, S. Farrens, M. Frailis, E. Franceschi, S. Galeotta, B. Garilli, W. Gillard, B. Gillis, C. Giocoli, A. Grazian, F. Grupp, S. V. H. Haugan, H. Hoekstra, W. Holmes, F. Hormuth, A. Hornstrup, K. Jahnke, M. Kuemmel, S. Kermiche, A. Kiessling, M. Kunz, H. Kurki-Suonio, R. Laureijs, S. Ligori, P. B. Lilje, I Lloro, E. Maiorano, O. Marggraf, K. Markovic, F. Marulli, R. Massey, H. J. McCracken, M. Melchior, G. Meylan, M. Moresco, L. Moscardini, E. Munari, S. M. Niemi, C. Padilla, F. Pasian, K. Pedersen, W. J. Percival, V Pettorino, S. Pires, M. Poncet, L. Popa, L. Pozzetti, F. Raison, A. Renzi, J. Rhodes, G. Riccio, E. Romelli, E. Rossetti, D. Sapone, B. Sartoris, P. Schneider, A. Secroun, G. Seidel, C. Sirignano, G. Sirri, L. Stanco, P. Tallada-Crespi, D. Tavagnacco, A. N. Taylor, I Tereno, R. Toledo-Moreo, F. Torradeflot, I Tutusaus, E. A. Valentijn, L. Valenziano, T. Vassallo, Y. Wang, A. Zacchei, G. Zamorani, J. Zoubian, S. Andreon, S. Bardelli, J. Gracia-Carpio, D. Maino, N. Mauri, A. Tramacere, E. Zucca, A. Alvarez Ayllon, H. Aussel, C. Baccigalupi, A. Balaguera-Antolinez, M. Ballardini, A. Biviano, M. Bolzonella, E. Bozzo, C. Burigana, R. Cabanac, A. Cappi, C. S. Carvalho, S. Casas, G. Castignani, A. Cooray, J. Coupon, H. M. Courtois, S. Davini, G. Desprez, H. Dole, J. A. Escartin, S. Escoffier, M. Farina, S. Fotopoulou, K. Ganga, J. Garcia-Bellido, K. George, F. Giacomini, G. Gozaliasl, H. Hildebrandt, I Hook, O. Ilbert, V Kansal, A. Kashlinsky, E. Keihanen, C. C. Kirkpatrick, A. Loureiro, J. Macias-Perez, M. Magliocchetti, G. Mainetti, R. Maoli, M. Martinelli, N. Martinet, R. B. Metcalf, G. Morgante, S. Nadathur, A. A. Nucita, L. Patrizii, V Popa, Porciani, D. Potter, A. Pourtsidou, P. Reimberg, A. G. Sanchez, Z. Sakr, M. Schirmer, E. Sefusatti, M. Sereno, J. Stadel, R. Teyssier, C. Valieri, J. Valiviita, A. Veropalumbo, M. Viel
Summary: The C3R2 project aims to empirically calibrate the color-redshift relation of galaxies to the Euclid depth through spectroscopic observations of a representative sample. By filling gaps in previous spectroscopic measurements, the project will provide necessary calibration for the Euclid mission.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
R. Cawthon, J. Elvin-Poole, A. Porredon, M. Crocce, G. Giannini, M. Gatti, A. J. Ross, E. S. Rykoff, A. Carnero Rosell, J. DeRose, S. Lee, M. Rodriguez-Monroy, A. Amon, K. Bechtol, J. De Vicente, D. Gruen, R. Morgan, E. Sanchez, J. Sanchez, I Sevilla-Noarbe, T. M. C. Abbott, M. Aguena, S. Allam, J. Annis, S. Avila, D. Bacon, E. Bertin, D. Brooks, D. L. Burke, M. Carrasco Kind, J. Carretero, F. J. Castander, A. Choi, M. Costanzi, L. N. da Costa, M. E. S. Pereira, K. Dawson, S. Desai, H. T. Diehl, K. Eckert, S. Everett, I Ferrero, P. Fosalba, J. Frieman, J. Garcia-Bellido, E. Gaztanaga, R. A. Gruendl, J. Gschwend, G. Gutierrez, S. R. Hinton, D. Hollowood, K. Honscheid, D. Huterer, D. J. James, A. G. Kim, J-P Kneib, K. Kuehn, N. Kuropatkin, O. Lahav, M. Lima, H. Lin, M. A. G. Maia, P. Melchior, F. Menanteau, R. Miquel, J. J. Mohr, J. Muir, J. Myles, A. Palmese, S. Pandey, F. Paz-Chinchon, W. J. Percival, A. A. Plazas, A. Roodman, G. Rossi, V Scarpine, S. Serrano, M. Smith, M. Soares-Santos, E. Suchyta, M. E. C. Swanson, G. Tarle, C. To, M. A. Troxel, R. D. Wilkinson
Summary: This study presents clustering redshift measurements for the Dark Energy Survey (DES) lens sample galaxies used in weak gravitational lensing and galaxy clustering studies. The methodology is validated in simulations and applied to estimate the redshift distribution for different photometrically selected bins. The results have important implications for calibrating the photometric redshift distributions used in companion papers for DES Year 3 results.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
K. J. Duncan, R. Kondapally, M. J. Brown, M. Bonato, P. N. Best, H. J. A. Roettgering, M. Bondi, R. A. A. Bowler, R. K. Cochrane, G. Guerkan, M. J. Hardcastle, M. J. Jarvis, M. Kunert-Bajraszewska, S. K. Leslie, K. Malek, L. K. Morabito, S. P. O'Sullivan, I Prandoni, J. Sabater, T. W. Shimwell, D. J. B. Smith, L. Wang, A. Wolowska, C. Tasse
Summary: The LOFAR Low Frequency Array Two-metre Sky Survey (LoTSS) provides sensitive, high-resolution survey data split across multiple tiers over the northern sky, including deep radio continuum imaging and photometric redshift estimation, with consistent results across the fields.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
Nesar Ramachandra, Jonas Chaves-Montero, Alex Alarcon, Arindam Fadikar, Salman Habib, Katrin Heitmann
Summary: Photometric redshift estimation algorithms can be improved by using physically motivated synthetic data to overcome sample bias and incompleteness issues. Regression algorithms and zero-point recalibration can enhance the accuracy of redshift estimation.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
P. W. Hatfield, M. J. Jarvis, N. Adams, R. A. A. Bowler, B. Haussler, K. J. Duncan
Summary: The paper presents a technique for predicting the photometric redshifts of galaxies using template fitting and machine learning methods. The results show that combining multiple methods improves the accuracy of photometric redshift predictions compared to using each method individually.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Rajendra P. Gupta
Summary: Ia supernovae are used as standard candles in cosmology, and their luminosity is found to depend on their distance when physical constants are allowed to evolve. Results suggest that SNeIa luminosities could have been much higher in the past, potentially leading to significant discrepancies in distance estimations for early supernovae. Variations in constants are given, showing that they can only vary concurrently rather than individually.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
M. Gatti, G. Giannini, G. M. Bernstein, A. Alarcon, J. Myles, A. Amon, R. Cawthon, M. Troxel, J. DeRose, S. Everett, A. J. Ross, E. S. Rykoff, J. Elvin-Poole, J. Cordero, I Harrison, C. Sanchez, J. Prat, D. Gruen, H. Lin, M. Crocce, E. Rozo, T. M. C. Abbott, M. Aguena, S. Allam, J. Annis, S. Avila, D. Bacon, E. Bertin, D. Brooks, D. L. Burke, A. Carnero Rosell, M. Carrasco Kind, J. Carretero, F. J. Castander, A. Choi, C. Conselice, M. Costanzi, L. N. da Costa, M. E. S. Pereira, K. Dawson, S. Desai, H. T. Diehl, K. Eckert, T. F. Eifler, A. E. Evrard, I Ferrero, B. Flaugher, P. Fosalba, J. Frieman, J. Garcia-Bellido, E. Gaztanaga, T. Giannantonio, R. A. Gruendl, J. Gschwend, S. R. Hinton, D. L. Hollowood, K. Honscheid, B. Hoyle, D. Huterer, D. J. James, K. Kuehn, N. Kuropatkin, O. Lahav, M. Lima, N. MacCrann, M. A. G. Maia, M. March, J. L. Marshall, P. Melchior, F. Menanteau, R. Miquel, J. J. Mohr, R. Morgan, R. L. C. Ogando, A. Palmese, F. Paz-Chinchon, W. J. Percival, A. A. Plazas, M. Rodriguez-Monroy, A. Roodman, G. Rossi, S. Samuroff, E. Sanchez, V Scarpine, L. F. Secco, S. Serrano, I Sevilla-Noarbe, M. Smith, M. Soares-Santos, E. Suchyta, M. E. C. Swanson, G. Tarle, D. Thomas, C. To, T. N. Varga, J. Weller, R. D. Wilkinson
Summary: In this study, we calibrated the redshift distribution n(z) of DES Y3 weak lensing source galaxies using clustering measurements. Two methods were used, and their uncertainties were evaluated through simulations. The results showed that both methods accurately estimated the redshift distribution of the source galaxies.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
N. Laporte, A. Zitrin, H. Dole, G. Roberts-Borsani, L. J. Furtak, C. Witten
Summary: This study focuses on the investigation of galaxy protoclusters at z>=6 using data from the James Webb Space Telescope. A protocluster with significant mass and several similar galaxies were identified. The findings provide valuable insights into the process of cosmic reionisation.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Wei Zhang, Guinevere Kauffmann, Jing Wang, Yanmei Chen, Jian Fu, Hong Wu
Summary: By estimating H i gas masses for about 7000 high-redshift galaxies in the DEEP2 survey, it was found that the high-mass end of the HIMF at high redshifts is similar to that of the local Universe. Furthermore, it was observed that massive star-forming galaxies do not dominate neutral gas at z similar to 1, and there is a steeper relationship between the H i gas mass fraction and stellar mass at higher redshifts. The scatter in the M-HI=SFR quantity increases from factors of 5-7 at z = 0 to close to 100 at z = 1, suggesting that there is no direct relation between H i gas and star formation in high-redshift galaxies.
ASTRONOMY & ASTROPHYSICS
(2021)