Zobrazeno 1 - 10
of 1 463
pro vyhledávání: '"YOSHIDA, NAOKI"'
Autor:
Harikane, Yuichi, Inoue, Akio K., Ellis, Richard S., Ouchi, Masami, Nakazato, Yurina, Yoshida, Naoki, Ono, Yoshiaki, Sun, Fengwu, Sato, Riku A., Fujimoto, Seiji, Kashikawa, Nobunari, McLeod, Derek J., Perez-Gonzalez, Pablo G., Sawicki, Marcin, Sugahara, Yuma, Xu, Yi, Yamanaka, Satoshi, Carnall, Adam C., Cullen, Fergus, Dunlop, James S., Egami, Eiichi, Grogin, Norman, Isobe, Yuki, Koekemoer, Anton M., Laporte, Nicolas, Lee, Chien-Hsiu, Magee, Dan, Matsuo, Hiroshi, Matsuoka, Yoshiki, Mawatari, Ken, Nakajima, Kimihiko, Nakane, Minami, Tamura, Yoichi, Umeda, Hiroya, Yanagisawa, Hiroto
We present the number densities and physical properties of the bright galaxies spectroscopically confirmed at $z\sim7-14$. Our sample is composed of 53 galaxies at $z_\mathrm{spec}\sim7-14$, including recently-confirmed galaxies at $z_\mathrm{spec}=1
Externí odkaz:
http://arxiv.org/abs/2406.18352
We consider a variant of the stochastic gradient descent (SGD) with a random learning rate and reveal its convergence properties. SGD is a widely used stochastic optimization algorithm in machine learning, especially deep learning. Numerous studies r
Externí odkaz:
http://arxiv.org/abs/2406.16032
Autor:
Lake, William, Williams, Claire E., Naoz, Smadar, Marinacci, Federico, Burkhart, Blakesley, Vogelsberger, Mark, Yoshida, Naoki, Chiaki, Gen, Chen, Avi, Chiou, Yeou S.
At high redshifts ($z\gtrsim12$), the relative velocity between baryons and dark matter (the so-called streaming velocity) significantly affects star formation in low-mass objects. Streaming substantially reduces the abundance of low-mass gas objects
Externí odkaz:
http://arxiv.org/abs/2405.14938
Autor:
Gawade, Priyanka, More, Anupreeta, More, Surhud, Kimura, Akisato, Sonnenfeld, Alessandro, Oguri, Masamune, Yoshida, Naoki
Galaxies that cause the strong gravitational lensing of background galaxies provide us crucial information about the distribution of matter around them. Traditional modelling methods that analyse such strong lenses are both time and resource consumin
Externí odkaz:
http://arxiv.org/abs/2404.18897
Autor:
Bertone, Gianfranco, Wierda, A. Renske A. C., Gaggero, Daniele, Kavanagh, Bradley J., Volonteri, Marta, Yoshida, Naoki
Dark matter overdensities around black holes can be searched for by looking at the characteristic imprint they leave on the gravitational waveform of binary black hole mergers. Current theoretical predictions of the density profile of dark matter ove
Externí odkaz:
http://arxiv.org/abs/2404.08731
Current models of the formation of first galaxies predict low masses and faint objects at extremely high redshifts, z=9-15. However, the first observations of this epoch indicate a higher-than-expected number of bright (sometimes massive) galaxies. N
Externí odkaz:
http://arxiv.org/abs/2404.02537
Autor:
Sugahara, Yuma, Álvarez-Márquez, Javier, Hashimoto, Takuya, Colina, Luis, Inoue, Akio K., Costantin, Luca, Fudamoto, Yoshinobu, Mawatari, Ken, Ren, Yi W., Arribas, Santiago, Bakx, Tom J. L. C., Blanco-Prieto, Carmen, Ceverino, Daniel, Gómez, Alejandro Crespo, Hagimoto, Masato, Hashigaya, Takeshi, Marques-Chaves, Rui, Matsuo, Hiroshi, Nakazato, Yurina, Pereira-Santaella, Miguel, Tamura, Yoichi, Usui, Mitsutaka, Yoshida, Naoki
We present JWST NIRCam imaging of B14-65666 ("Big Three Dragons"), a bright Lyman-break galaxy system ($M_\text{UV}=-22.5$ mag) at $z=7.15$. The high angular resolution of NIRCam reveals the complex morphology of two galaxy components: galaxy E has a
Externí odkaz:
http://arxiv.org/abs/2403.17133
Recent JWST observations with superb angular resolution have revealed the existence of clumpy galaxies at high redshift through the detection of rest-frame optical emission lines. We use the FirstLight simulation to study the properties of (sub-)gala
Externí odkaz:
http://arxiv.org/abs/2402.08911
Fuzzy dark matter (FDM) is an intriguing candidate alternative to the standard cold dark matter (CDM). The FDM model predicts that dark halos have characteristic core structures generated by the effect of quantum pressure, which is different from the
Externí odkaz:
http://arxiv.org/abs/2312.10744
Continuing work presented in Li et al. (2021), we performed a series of tests to our high-resolution three-dimensional mass map reconstruction algorithm \splinv{}. We test the mass reconstruction accuracy against realistic mock catalogs generated usi
Externí odkaz:
http://arxiv.org/abs/2312.00309