Zobrazeno 1 - 10
of 29
pro vyhledávání: '"Saumyadip Samui"'
Publikováno v:
Journal of Astrophysics and Astronomy. 44
In this review article, we briefly outline our current understanding of the physics associated with the HI 21-cm signal from cosmic dawn. We discuss different phases of cosmic dawn as the ambient gas and the background radiations evolve with the reds
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1eaef8b0f108f5985228618237818f7b
https://doi.org/10.1007/s12036-022-09904-w
https://doi.org/10.1007/s12036-022-09904-w
It is extremely important to understand the processes through which the thermal state of the inter-galactic medium (IGM) evolved in the early universe in order to study the evolution of HI 21-cm signal during cosmic dawn. Here, we consider the heatin
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bc58dbe3927d25ba20ddcc6d23b749a9
Autor:
Saumyadip Samui, Agniva Roychowdhury
We present semi-analytical models for magnetisation of the void inter-galactic medium (IGM) by outflows from void galaxies. The number density of dark matter haloes in an under-dense region (i.e., void) is obtained using the excursion set method exte
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8adacc6c7bda2246d0edd9a11aab3bd0
http://arxiv.org/abs/2110.03717
http://arxiv.org/abs/2110.03717
Publikováno v:
Neural Computing and Applications. 32:2365-2381
Symbiotic organisms search (SOS) is a new metaheuristic optimization algorithm proposed by Cheng and Prayogo (Comput Struct 139:98–112, 2014). In this paper, SOS has been applied to determine the functional forms of different time series which are
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d076c21cb2b19ab71dde3fdcadf7d623
https://doi.org/10.1007/s00521-019-04134-8
https://doi.org/10.1007/s00521-019-04134-8
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 476:1680-1695
We present semi-analytical models of galactic outflows in high redshift galaxies driven by both hot thermal gas and non-thermal cosmic rays. Thermal pressure alone may not sustain a large scale outflow in low mass galaxies (i.e $M\sim 10^8$~M$_\odot$
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8e802d2644c1ca6f74cf917c39e46ad1
https://doi.org/10.1093/mnras/sty287
https://doi.org/10.1093/mnras/sty287
Autor:
A. A. Mahabal, Saumyadip Samui, Vijay Mohan, Patrick Petitjean, Raghunathan Srianand, M. Vivek
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 440:799-820
We present results of our time variability studies of Mg II and Al III absorption lines in a sample of 22 Low Ionization Broad Absorption Line QSOs (LoBAL QSOs) at 0.2 = 1 year) absorption line variability is seen in 8 cases (36% systems) while only
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4679bcf8f894aa228b4e9e0336573bf6
https://doi.org/10.1093/mnras/stu288
https://doi.org/10.1093/mnras/stu288
Autor:
Saumyadip Samui, Arnab Sarkar
Publikováno v:
Publications of the Astronomical Society of the Pacific. 131:074101
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2ef0b3dd7307efac29037a1c7f955a99
https://doi.org/10.1088/1538-3873/ab10ea
https://doi.org/10.1088/1538-3873/ab10ea
Autor:
Kanan K. Datta, Rajesh Mondal, T. Roy Choudhury, Saumyadip Samui, Somnath Bharadwaj, Suman Majumdar, Aseem Paranjape, Raghunath Ghara
Publikováno v:
Journal of Astrophysics and Astronomy
Studying the cosmic dawn and the epoch of reionization through the redshifted 21 cm line are among the major science goals of the SKA1. Their significance lies in the fact that they are closely related to the very first stars in the universe. Interpr
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2fbf4d9604ba217eb787a491dfb1ad00
https://doi.org/10.1007/s12036-016-9403-z
https://doi.org/10.1007/s12036-016-9403-z
Autor:
Saumyadip Samui, Shanoli Samui Pal
We present an improved photometric redshift estimator code, CuBAN$z$, that is publicly available at https://goo.gl/fpk90V}{https://goo.gl/fpk90V. It uses the back propagation neural network along with clustering of the training set, which makes it mo
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5f5570d4c8c8a4447651f1ee0da30daa
http://arxiv.org/abs/1609.03568
http://arxiv.org/abs/1609.03568
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 377:285-299
We present a self-consistent, semi-analytical LCDM model of star formation and reionization. For the cosmological parameters favored by the WMAP data, our models consistently reproduce the optical depth to reionization, redshift of reionization and t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6f72e35e2dc4211600a785822f9af3e8
https://doi.org/10.1111/j.1365-2966.2007.11603.x
https://doi.org/10.1111/j.1365-2966.2007.11603.x