Education
Course Offered
The following are some of the courses which I have taught multiple times over the years
- Introduction to Astronomy & Astrophysics
- Astrophysical Concepts
- Astronomical Techniques
- General Physics - II (Astronomy Module)
- Galaxies (Structure, Dynamics & Evolution)
- Cosmology & Astrobiology
- The Universe in a Nutshell (Inst. Elective)
- Research Methodology (for Ph.D. students)
- Basics of Astrobiology
- Planetary Sciences
Experience
Research Work / Area
My research, over the years, has involved studying the physical properties of gas outside of galaxies, in the circumgalactic medium and intergalactic space, from the distant universe to the present. Throughout cosmic history, more than 90% of the cosmic budget of baryons in the universe have resided outside of galaxies. Compared to the more distant and early universe, the distribution of the baryonic matter relative to galaxies in the last few billion year history of the universe has been complex and less understood. The formation of galaxies, galaxy clusters, and large scale structures has redistributed the baryons into gas phases extending over a wide range of densities and temperatures. In my work, I have tried to discover reservoirs of such baryons in the CGM & IGM environments in the low redshift universe, explore in detail their properties and association with galaxies, and explain their astrophysical importance in the larger context of the co-evolution of galaxies and the intergalactic medium. The work of our group has added significant amount of detail to the ongoing global research efforts in this particular field of extragalactic astronomy. For our work, we have used spectroscopic and imaging data from a wide array of ground-based and space-based observatories including the European Southern Observatory’s VLT, the Keck Observatory, the Hubble Space Telescope, and the Far-Ultraviolet Spectroscopic Explorer (FUSE) satellite.
Publications
- Sameer, Charlton, Jane C. ; Kacprzak, Glenn G. ; Narayanan, Anand ; Sankar, Sriram, Richter, Philipp ; Wakker, Bart P. ; Nielsen, Nikole M., Churchill, Christopher W.; Probing the physicochemical properties of the Leo Ring and the Leo I group, 2022, Monthly Notices of the Royal Astronomical Society, Vol. 510, Issue 4, pp 5896-5820
- Dorigo Jones, J; Johnson Sean D.; Muzahid, Sowgat; Charlton, Jane C.; Chen Hsiao-Wen; Narayanan, Anand; Sameer, Schaye, Joop; Wijers Natasha A.; Improving blazar redshift constraints with the edge of the Ly-alpha forest: 1ES 1553+113 and implications for observations of the WHIM, 2021, Monthly Notices of Royal Astronomical Society (accepted), arXiV: 2111.06927
- Narayanan, Anand ; Sameer ; Muzahid, Sowgat ; Johnson, Sean D.; Udhwani, Purvi ; Charlton, Jane C. ; Mauerhofer, Valentin; Schaye, Joop; Yadav, Mathin, A partial Lyman limit system tracing intragroup gas at z = 0.8 towards HE 1003 + 0149, 2021, Monthly Notices of the Royal Astronomical Society, Volume 505, Issue 1, pp.738-754.
- Manuwal, Aditya; Narayanan, Anand, Udhwani, Purvi ; Srianand, Raghunathan ; Savage, Blair D. ; Charlton, Jane C. ; Misawa, Toru; The COS-legacy survey of C IV absorbers, 2021, Monthly Notices of the Royal Astronomical Society, Volume 505, Issue 3, pp.3635-3654.
- Anshul, Pratyush; Narayanan, Anand; Muzahid, Sowgat; Beckett, Alexander; Morris, Simon L.; Pair Lines of Sight Observations of Multiphase Gas Bearing O VI in a Galaxy Environment, 2021, Monthly Notices of the Royal Astronomical Society, Volume 503, Issue 3, pp.3243-3261.
- Sameer; J. C. Charlton; J. M. Norris; M. Gebhardt; C. W. Churchill; G. G. Kacprzak; S. Muzahid, A. Narayanan; N. M. Nielsen; P. Richter, and B. P. Wakker; Cloud-by-cloud, multiphase, Bayesian modeling: Application to four weak, low ionization absorbers, 2021, Monthly Notices of the Royal Astronomical Society, Volume 501, Issue 2, 2112.
- Sankar, Sriram; Narayanan, Anand; Savage, Blair D.; Khaire, Vikram; Rosenwasser, Benjamin E.; Charlton, Jane; Wakker, Bart P, Physical Conditions of Five O VI Absorption Systems Towards PG 1522+101, 2020, Monthly Notices of the Royal Astronomical Society, Volume 498, Issue 4, 4864.
- Pradeep, Jayadev; Sankar, Sriram; Umasree, T. M.; Narayanan, Anand; Khaire, Vikram; Gebhardt, Matthew; Sameer, Charlton, Jane C., Solar-metallicity gas in the extended halo of a galaxy at z ∼ 0.12, 2020, Monthly Notices of the Royal Astronomical Society, Volume 493, Issue 1, 250.
- Pradeep, Jayadev; Narayanan, Anand; Muzahid, Sowgat; Nagai, Daisuke; Charlton, Jane C.; Srianand, Raghunathan. Detection of metal-rich, cool-warm gas in the outskirts of galaxy clusters, 2019, Monthly Notices of the Royal Astronomical Society, Volume 488, Issue 4, 5327.
- Manuwal, Aditya; Narayanan, Anand; Muzahid, Sowgat; Charlton, Jane. C.; Khaire, Vikram; Chand, Hum. C IV absorbers tracing cool gas in dense galaxy group/cluster environments, 2019, Monthly Notices of the Royal Astronomical Society, Volume 485, Issue 1, 30.
- Muzahid, Sowgat.; Fonseca, G.; Roberts, A.; Rosenwasser, B.; Richter, P.; Narayanan, A.; Churchill, C.; Charlton, J., COS-Weak: probing the CGM using analogues of weak Mg II absorbers at z < 0.3, 2018, Monthly Notices of the Royal Astronomical Society, Volume 476, Issue 4, 4965.
- Narayanan, Anand; Savage, Blair D.; Mishra, Preetish K.; Wakker, Bart P.; Khaire, Vikram; Wadadekar, Yogesh, Detection of low-metallicity warm plasma in a galaxy overdensity environment at z ∼ 0.2, 2018, Monthly Notices of the Royal Astronomical Society, Volume 475, Issue 3, 3529.
- Pachat, Sachin; Narayanan, Anand; Khaire, Vikram; Savage, Blair, D.; Muzahid, Sowgat; Wakker, Bart. P.; Detection of two intervening Ne VIII absorbers probing warm gas at z = 0.6, 2017, Monthly Notices of the Royal Astronomical Society, Volume 471, Issue 1, 792.
- Pachat, Sachin; Narayanan, Anand; Muzahid, Sowgat; Khaire, Viram; Srianand, Raghunathan; Wakker, Bart, P; Savage, Blair, D.; A pair of O VI and broad Ly-alpha absorbers probing warm gas in a galaxy group environment at z 0.4, 2016, Monthly Notices of the Royal Astronomical Society, Volume 458, Issue 1, 733.
- Hussain, Tanvir.; Muzahid, Sowgat; Narayanan, Anand; Srianand, Raghunathan; Wakker, Bart P.; Charlton, Jane C.; Pathak, Amit, HST/COS detection of a Ne VIII absorber towards PG 1407+265: an unambiguous tracer of collisionally ionized hot gas?, 2015, Monthly Notices of the Royal Astronomical Society, Volume 446, Issue 3, 2444.
- Muzahid, Sowgat, Srianand, Raghunathan, Arav, Nahum, Savage, Blair D., Narayanan, Anand, HST/COS Observations of a New Population of Associated QSO Absorbers, 2013, Monthly Notices of Royal Astronomical Society, Volume 431, Issue 3, 2885.
- Rodriguez Hidalgo, Paola; Wessels, Kaylan; Charlton, Jane C.; Narayanan, Anand; Mshar, Andrew; Cucchiara, Antonino; Jones, Therese., Evolution of the Population of Very Strong Mg II Absorbers, 2012, Monthly Notices of Royal Astronomical Society, Volume 427, Issue 3, 1801.
- Muzahid, Sowgat; Srianand, Raghunathan; Savage, Blair D.; Narayanan, Anand; Mohan, Vishnu; Dewangan, Gulab C.; Highly Ionized Collimated Outflow from HE 0238-1904, 2012, Monthly Notices of Royal Astronomical Society Letters, Volume 424, Issue 1, L59.
- Savage, Blair D.; Kim, Tae-Sun; Keeney, Brian; Narayanan, Anand; Stocke, John; Wakker, Bart P., The Properties of Two Low Redshift O VI Absorbers and Their Associated Galaxies Toward 3C 263, 2012, Astrophysical Journal, Volume 753, Issue 1, 80.
- Narayanan, Anand; Savage, Blair D.; Wakker, Bart P., Cosmic Origins Spectrograph Observations of Warm Intervening Gas at z = 0.325 towards 3C263, 2012, Astrophysical Journal, Volume 752, Issue 1, 65.
- Savage, Blair D., Lehner, Nicholas, Narayanan, Anand, COS Observations of Metal Line and Broad Lyman-alpha Absorption in the Multi-phase O VI and Ne VIII System at z = 0.20701 toward HE 0226-4110, 2011, Astrophysical Journal, Volume 743, Issue 2, 180.
- Savage, Blair D.; Narayanan, Anand; Lehner, Nicholas; Wakker, Bart P., A Multiphase Absorber Containing O VI and Broad H I Directly Tracing Million Kelvin Plasma at Low Redshift Toward HE 0153-4520, 2011, Astrophysical Journal, Volume 731, Issue 1
- Narayanan, Anand; Savage, Blair D.; Wakker, Bart P.; Danforth, Charles W.; Yao, Yangsen; Keeney, Brian. A.; Shull, Michael J.; Sembach, Kenneth R., Froning, Cynthia S., Green, James C., 2011, Astrophysical Journal, Volume 730, Issue 1, 15.
- Narayanan, Anand; Wakker, Bart P.; Savage, Blair D.; Keeney, Brian A.; Shull, Michael J.; Stocke, John T.; Sembach, Kenneth R; Cosmic Origins Spectrograph and FUSE Observations of T ∼ 100,000 K Gas In A Nearby Galaxy Filament, 2010, Astrophysical Journal, Volume 721, Issue 2, 960.
- Savage, Blair D.; Narayanan, Anand; Wakker, Bart P.; Stocke, John T.; Keeney, Brian A., Shull, Michael J.; Sembach, Kenneth R.; Yao, Yangsen; Green, James C., O VI Absorbers Tracing Hot Gas Associated with a Pair of Galaxies at z = 0.167, 2010, Astrophysical Journal, Volume 719, Issue 2, 1526.
- Narayanan, Anand; Savage, Blair D.; Wakker, Bart P.; Highly Ionized Plasma in the Halo of a Luminous Spiral Galaxy Near z = 0.225, 2010, Astrophysical Journal, Volume 712, Issue 2, 1443.
- Narayanan, Anand; Wakker, Bart P., Savage, Blair D., Detection of Ne VIII in a Multi-phase Intergalactic System Towards 3c 263, 2009, Astrophysical Journal, Volume 703, Issue 1, 74.
- Cucchiara, Antonino; Jones, Therese; Charlton, Jane C.; Fox, Derek B.; Einsig, Derek; Narayanan, Anand, Testing the Possible Intrinsic Origin of the Excess Very Strong Mg II Absorbers Along Gamma-Ray Burst Lines-of-Sight, 2009, Astrophysical Journal, Volume 697, Issue 1, 345.
- Narayanan, Anand; Charlton, Jane C.; Misawa, Toru; Green, Rebecca E.; Kim, Tae-Sun.,The Chemical and Ionization Conditions in Weak Mg II Absorbers, 2008, Astrophysical Journal, Volume 689, Issue 2, 782.
- Misawa, Toru; Charlton, Jane C.; Narayanan, Anand, Supersolar Metallicity in Weak Mg II Absorption Systems at z ∼ 1.7, 2008, Astrophysical Journal, Volume 679, Issue 1, 220.
- Narayanan, Anand; Misawa, Toru; Charlton, Jane C.; Kim, Tae-Sun., A Survey of Weak Mg II Absorbers at 0.4 < z < 2.4, 2007, Astrophysical Journal, Volume 660, Issue 2, 1093.
- Narayanan, Anand; Misawa, Toru; Charlton, Jane C.; Ganguly, Rajib, The Advantage of Increased Resolution in the Study of Quasar Absorption Systems, 2006, Astrophysical Journal, Volume 132, Issue 5, 2099.
- Narayanan, Anand; Charlton, Jane C.; Masiero, Joe R.; Lynch, Ryan, A Survey of Analogs to Weak Mg II Absorbers in the Present, 2005, Astrophysical Journal, Volume 632, Issue 1, 92.
The names highlighted are of students who have worked in our research group at the Indian Institute of Space Science & Technology.