Zobrazeno 1 - 10
of 13
pro vyhledávání: '"Anjan Kumar Sarkar"'
Autor:
Abinash Kumar Shaw, Arnab Chakraborty, Mohd Kamran, Raghunath Ghara, Samir Choudhuri, Sk. Saiyad Ali, Srijita Pal, Abhik Ghosh, Jais Kumar, Prasun Dutta, Anjan Kumar Sarkar
The redshifted 21-cm radiation from the atomic hydrogen (HI) provides an excellent direct probe to study the evolution of HI in IGM and thus reveal the nature of the first luminous objects, their evolution and role during Cosmic Dawn (CD) and Epoch o
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e18e3377b2532f399ca2859947836742
http://arxiv.org/abs/2211.05512
http://arxiv.org/abs/2211.05512
Autor:
Kanan K. Datta, Suman Majumdar, Anjan Kumar Sarkar, Somnath Bharadwaj, Rajesh Mondal, Keri L. Dixon, Abinash Kumar Shaw, Ilian T. Iliev
The light-cone (LC) effect causes the mean as well as the statistical properties of the redshifted 21-cm signal $T_{\rm b}(\hat{\bf n},\nu)$ to change with frequency $\nu$ (or cosmic time). Consequently, the statistical homogeneity (ergodicity) of th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d4dea79b83335f412957721ff49f91e0
Autor:
Kanan K. Datta, Abinash Kumar Shaw, Ilian T. Iliev, Rajesh Mondal, Somnath Bharadwaj, Suman Majumdar, Anjan Kumar Sarkar
The light-cone (LC) effect imprints the cosmological evolution of the redshifted 21-cm signal $T_{\rm b} ({\hat{\bf{n}}}, \nu)$ along the frequency axis which is the line of sight (LoS) direction of an observer. The effect is particularly pronounced
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c318ca2274d4d8e4d45e96de9a485c93
http://arxiv.org/abs/1810.06273
http://arxiv.org/abs/1810.06273
Publikováno v:
Journal of Cosmology and Astroparticle Physics. 2019:058-058
We have considered the prospects for measuring the cross Warm Dark Matter (WDM) power spectrum of the redshifted HI 21-cm signal and the Lyman-$\alpha$ forest and thereby constraining WDM mass using observations with upcoming radio-interferometers -
Simulations play a vital role in testing and validating HI 21-cm power spectrum estimation techniques. Conventional methods use techniques like N-body simulations to simulate the sky signal which is then passed through a model of the instrument. This
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::801acf3405277d325cefd5dcf16c264e
http://arxiv.org/abs/1709.03984
http://arxiv.org/abs/1709.03984
We use the Fisher matrix formalism to predict the prospects of measuring the redshifted 21-cm power spectrum in different $k$-bins using observations with the upcoming Ooty Wide Field Array (OWFA) which will operate at $326.5 {\rm MHZ}$. This corresp
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9e3e489b47ffe424158be97c6cafe2a5
http://arxiv.org/abs/1703.00634
http://arxiv.org/abs/1703.00634
Publikováno v:
Journal of Cosmology and Astroparticle Physics. 2018:051-051
We have studied the possibility of measuring the cross-correlation of the redshifted HI 21-cm signal and the Lyman-$\alpha$ forest using an upcoming radio-interferometric array OWFA and an spectroscopic observation like SDSS-IV. Our results shows tha
Autor:
B. Kartikeyan, Shaunak Chatterjee, Debapriya Chatterjee, Arka Majumdar, Anjan Kumar Sarkar, Shibendu S. Ray
Publikováno v:
International Journal of Remote Sensing. 29:5479-5493
This work proposes a neuro-fuzzy method for suggesting alternative crop production over a region using integrated data obtained from land-survey maps as well as satellite imagery. The methodology proposed here uses an artificial neural network (multi
We have used the Fisher matrix formalism to quantify the prospects of detecting the z = 3.35 redshifted 21-cm HI power spectrum with the upcoming radio-imterferometric array OWFA. OWFA's frequency and baseline coverage spans comoving Fourier modes (k
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8b6f6e920d4e4915bb4fc6e2c38d89af
Autor:
Shaw, Abinash Kumar1,2 (AUTHOR) abinashkumarshaw@gmail.com, Chakraborty, Arnab3 (AUTHOR) arnab.phy.personal@gmail.com, Kamran, Mohd4 (AUTHOR), Ghara, Raghunath2 (AUTHOR), Choudhuri, Samir5,6 (AUTHOR), Ali, Sk. Saiyad7 (AUTHOR), Pal, Srijita1 (AUTHOR), Ghosh, Abhik8 (AUTHOR), Kumar, Jais9,10 (AUTHOR), Dutta, Prasun9 (AUTHOR), Sarkar, Anjan Kumar11,12 (AUTHOR)
Publikováno v:
Journal of Astrophysics & Astronomy. 1/20/2023, Vol. 44 Issue 1, p1-36. 36p.