• Deep uGMRT observations for enhanced calibration of 21 cm arrays – I. First image and source catalogue

Khandakar Md Asif Elahi, Samir Choudhuri, Nirupam Roy, Md Rashid, Philip Bull, Dharam Vir Lal , MNRAS (2025), arxiv link  

• The Tracking Tapered Gridded Estimator for the 21-cm power spectrum from MWA drift scan observations II: The Missing Frequency Channels

Khandakar Md Asif Elahi, Somnath Bharadwaj, Suman Chatterjee, Shouvik Sarkar, Samir Choudhuri, Shiv Sethi, Akash Kumar Patwa,  

arxiv link

• The Tracking Tapered Gridded Estimator for the 21-cm power spectrum from MWA drift scan observations I: Validation and preliminary results

Suman Chatterjee, Khandakar Md Asif Elahi, Somnath Bharadwaj, Shouvik Sarkar, Samir Choudhuri, Shiv Sethi, Akash Kumar Patwa

Publ. Astron. Soc. Aust. 41 (2024) e077 , arxiv link

• Towards 21-cm intensity mapping at z = 2.28 with uGMRT using the tapered gridded estimator – IV. Wide-band analysis

Kh Md Asif Elahi, Somnath Bharadwaj, Srijita Pal, Abhik Ghosh, Sk Saiyad Ali, Samir Choudhuri, Arnab Chakraborty, Abhirup Datta, Nirupam Roy, Madhurima Choudhury, Prasun Dutta

 2024, MNRAS, Volume 529, Issue 4, pp.3372–3386 , arxiv link

• Towards 21-cm intensity mapping at z = 2.28 with uGMRT using the tapered gridded estimator – III. Foreground removal

Kh Md Asif Elahi, Somnath Bharadwaj, Srijita Pal, Abhik Ghosh, Sk Saiyad Ali, Samir Choudhuri, Arnab Chakraborty, Abhirup Datta, Nirupam Roy, Madhurima Choudhury, Prasun Dutta

 2023, MNRAS, Volume 525, Issue 3, pp.3439–3454 , arxiv link

• Towards 21-cm intensity mapping at z = 2.28 with uGMRT using the tapered gridded estimator – II. Cross-polarization power spectrum

Kh. Md. Asif Elahi, Somnath Bharadwaj, Abhik Ghosh, Srijita Pal, Sk. Saiyad Ali, Samir Choudhuri, Arnab Chakraborty, Abhirup Datta, Nirupam Roy, Madhurima Choudhury, Prasun Dutta

 2023, MNRAS, Volume 520, Issue 2, pp.2094-2108 , arxiv link

• Towards 21-cm Intensity Mapping at z=2.28 with uGMRT using the Tapered Gridded Estimator I: Foreground Avoidance

Srijita Pal, Kh. Md. Asif Elahi, Somnath Bharadwaj, Sk. Saiyad Ali, Samir Choudhuri, Abhik Ghosh, Arnab Chakraborty, Abhirup Datta, Nirupam Roy, Madhurima Choudhury, Prasun Dutta

2022, MNRAS, Volume 516, Issue 2, pp.2851-2863 , arxiv link

• Detection of HI 21 cm emission from a strongly lensed galaxy at z~1.3

Arnab Chakraborty, Nirupam Roy

2022, MNRAS, Volume 519, Issue 3, pp.4074-4081 , arxiv link

• Demonstrating the Tapered Gridded Estimator (TGE) for the Cosmological HI 21-cm Power Spectrum using 150 MHz GMRT observations

Srijita Pal, Somnath Bharadwaj, Abhik Ghosh, Samir Choudhuri

 2021, MNRAS, Volume 501, Issue 3, pp.3378-3391 , arxiv link

• All sky angular power spectrum: I. Estimating brightness temperature fluctuations using TGSS 150 MHz survey

Samir Choudhuri, Abhik Ghosh, Nirupam Roy, Somnath Bharadwaj, Huib. T. Intema, Sk. Saiyad Ali

 2020, MNRAS, 494, 1936 , arxiv link

• First multi-redshift limits on post-Epoch of Reionization (post-EoR) 21 cm signal from z = 1.96 - 3.58 using uGMRT

Arnab Chakraborty, Abhirup Datta, Nirupam Roy, Somnath Bharadwaj, Tirthankar Roy Choudhury, Kanan K. Datta, Srijita Pal, Madhurima Choudhury, Samir Choudhuri, Prasun Dutta, Debanjan Sarkar

ApJL, Vol 907, Issue 1, id.L7, 6 pp , arxiv link

• Characterizing EoR foregrounds: A study of the Lockman Hole Region at 325 MHz

     Aishrila Mazumder, Arnab Chakraborty, Abhirup Datta, Samir Choudhuri, Nirupam Roy, Yogesh Wadadekar, C. H. Ishwara-Chandra 

     2020, MNRAS, 495, 4071, arxiv link

• The study of the angular and spatial distribution of radio selected AGNs and star-forming galaxies in the ELAIS N1 field 

 Arnab Chakraborty, Prasun Dutta, Abhirup Datta, Nirupam Roy 

2020, MNRAS, 494, 3392,  arxiv link

• Detailed study of ELAIS N1 field with the uGMRT -- II. Source Properties and Spectral Variation Of Foreground Power Spectrum from 300-500 MHz Observations 

 Arnab Chakraborty, Nirupam Roy, Abhirup Datta, Samir Choudhuri, Kanan K. Datta, Prasun Dutta, Somnath Bharadwaj, Huib Intema, Madhurima Choudhury, Srijita Pal, Tirthankar Roy Choudhury 

MNRAS, 2019, 490, 243 , arxiv link

• Detailed study of the ELAIS N1 field with the uGMRT - I. Characterizing the 325 MHz foreground for redshifted 21 cm observations, MNRAS (2019), arXiv:1906.01655                                                                                                                                                   Arnab Chakraborty, Abhirup Datta, Samir Choudhuri, Nirupam Roy, Huib Intema, Madhurima Choudhury, Kanan K. Datta, Srijita Pal, Somnath Bharadwaj, Prasun Dutta, Tirthankar Roy Choudhury

• The angular power spectrum measurement of the Galactic synchrotron emission in two fields of the TGSS survey, MNRAS:Letters (2017), arXiv:1704.08642   

 Samir Choudhuri, Somnath Bharadwaj, Sk. Saiyad Ali, Nirupam Roy, Huib. T. Intema, Abhik Ghosh

• Characterizing Foreground for redshifted 21-cm radiation: 150 MHz GMRT observations, MNRAS (2012), arXiv:1208.1617 

Abhik Ghosh, Jayanti Prasad, Somnath Bharadwaj, Sk. Saiyad Ali, Jayaram N. Chengalur

• Improved foreground removal in GMRT 610 MHz observations towards redshifted 21-cm tomography, MNRAS (2011), arXiv:1108.3707                             

Abhik Ghosh, Somnath Bharadwaj, Sk. Saiyad Ali, Jayaram N. Chengalur

• Foregrounds for redshifted 21-cm studies of reionization: Giant Meter Wave Radio Telescope 153-MHz observations, MNRAS (2008), arXiv:0801.2424 

 Sk. Saiyad Ali, Somnath Bharadwaj, Jayaram N. Chengalur