Ankur Upadhyaya
I am currently a first-year Ph.D. student in the Astronomy and Astrophysics group at the University of Warwick, UK, where I am actively involved in the extra-galactic and modeling team under the guidance of Dr. Elizabeth StanwayLink opens in a new window. My primary focus is on comparing the spectra of high redshift galaxies (z~5-7), gathered using the Near Infra Red Spectrograph (NIRSpec) instrument of the James Webb Space Telescope (JWST), with those derived from state-of-the-art Binary Population and Spectral Synthesis (BPASS) models. This project involves a comprehensive analysis where I assess the agreement between observations and models, aiming to identify areas for improvement in the existing models. Ultimately, the goal is to enhance our understanding of the early universe by developing models that better predict observations and characterize the physical conditions of Cosmic Dawn.
Before my current role, I completed my Master's thesis at the University of Geneva, Switzerland, where I worked with Prof. Daniel Schaerer and Dr. Rui Marques-Chaves. The focus of my research was the detection of Very Massive Stars (VMS) within Extreme UV-bright star-forming galaxies situated at redshifts (z) between 2 to 4. Utilizing the VMS models developed by Dr. Fabrice Martins and Dr. Ana Palacios from the University of Montpellier, France, I successfully identified the presence of VMS in these galaxies. This work led to additional projects investigating the existence of VMS in the Sunburst Cluster (z=2.37) and in the local universe. I collaborated with Dr. Eros Vanzella's team at INAF Bologna, Italy, to detect VMS in the Sunburst Cluster and collaborated with Dr. Fabrice Martins to extend the study to the local universe, resulting in multiple publications.
For further details on my academic contributions and a complete list of my publications, you can refer to NASA ADS via this linkLink opens in a new window. Additionally, my full CV is available upon request via this linkLink opens in a new window. Feel free to reach out if you have any inquiries or wish to learn more about my research works.
Publications:
First Author:
- Evidence for Very Massive Stars in extremely UV-bright star-forming galaxies at z ~ 2.2 - 3.6Link opens in a new window - Ankur Upadhyaya et al., accepted in A&A; March 2024.
Co-Author:
- Inferring the presence of very massive stars in local star-forming regionsLink opens in a new window - Fabrice Martins, Daniel Schaerer, Rui Marques-Chaves, Ankur Upadhyaya 2023, A&A, 678, A159 (2023).
- Clues on the presence and segregation of very massive stars in the Sunburst Lyman-continuum cluster at z = 2.37Link opens in a new window - Uros Mestric, Eros Vanzella, Ankur Upadhyaya et al. 2023, A&A, 673, A50 (2023).
- An extreme blue nugget, UV-bright starburst at z = 3.613 with 90 per cent of Lyman continuum photon escapeLink opens in a new window - Rui Marques-Chaves, Daniel Schaerer,..., Ankur Upadhyaya et al. 2022, MNRAS, 517, 2972.
Observing Proposals:
Hubble Space Telescope (HST):
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Co-PI in Cycle 31: Successful allocation of 23 Orbits of HST Observation with WFC3 instrument: High-resolution imaging of the ionizing and non-ionizing radiation of extreme starbursts at z ~ 2.4Link opens in a new window - Rui Marques-Chaves, Daniel Schaerer, John Chisholm, Pascal Oesch,.., Ankur Upadhyaya, Eros Vanzella, Uros Mestric, et al.
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Co-PI in Cycle 30: Successful allocation of 5 Orbits of HST Observation with WFC3 and ACS instruments: Unveiling the origin and nature of the UV-brightest Lyman continuum emitting star-forming galaxyLink opens in a new window - Rui Marques-Chaves, Daniel Schaerer, John Chisholm, Floriane Leclercq, Ankur Upadhyaya.
Very Large Telescope (VLT):
- Co-PI in Cycle P113: Successful allocation of 5 hours of FORS2 Observation: Confirmation of Very Massive Stars and an unusual IMF in a UV bright starburst at z ∼ 2 - Rui Marques-Chaves, Daniel Schaerer, Fabrice Martins, Ankur Upadhyaya.
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Co-PI in Cycle P111: Successful allocation of 16 hours of FORS2 Observation: Observations of the ionizing spectra in the Lyman continuum of distant starbursts - Rui Marques-Chaves, Daniel Schaerer,.., Ankur Upadhyaya.
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Co-PI in Cycle P110: Successful allocation of 18 hours of Xshooter Observation: Xshooter Survey of Extremely UV and Lyα Luminous Star-forming Galaxies at z=2.0-3.6 - Rui Marques-Chaves, Daniel Schaerer,.., Ankur Upadhyaya.
Honors & Awards:
- Warwick Ph.D. Prize ScholarshipLink opens in a new window for top 3% candidates, University of Warwick, United Kingdom. The scholarship covers the Ph.D. tuition fee, and living stipend for 4 years at the UKRI rates, along with other benefits.
- Scholarship worth CHF 12.5k for the academic year 2021-22 by the Hans Wilsdorf FoundationLink opens in a new window of Geneva, Switzerland associated with the University of Geneva, Switzerland.
Coming from a poor background, I am deeply passionate about addressing issues related to the upliftment of impoverished people. The challenges of my upbringing have instilled in me a profound belief that poverty is a primary source of human suffering. One of my life goals is to combat human misery, starting with the eradication of poverty. I am convinced that the immediate threat to human civilization is not an external force like an asteroid strike but rather certain negative human impulses that have the potential to bring about our downfall. I believe that unless we collectively suppress these detrimental impulses and nurture positive ones, humanity may face a precarious future. In my view, individual actions of kindness play a crucial role in fostering positive impulses and can be practiced in everyday life. Such actions include extending help, providing motivation, offering encouragement, and simply being kind to others. Unfortunately, poverty poses a significant challenge to amplifying these positive qualities, often bringing out the worst in humanity.
As part of one of the first generations with widespread access to the Internet, I have personally experienced the transformative power of decentralized information. This accessibility has enabled me to climb from the bottom of the societal hierarchy to study science and engage in scientific research at top institutions worldwide. If you are interested in learning more about me or my research work, please feel free to reach out. I am eager to share my experiences and discuss how we can collectively contribute to making a positive impact on the world.
