HC
Hum Chand
astro-ph.GAastro-ph.HEastro-ph.COastro-phhep-thgr-qcastro-ph.IMhep-phastro-ph.SRphysics.acc-ph
On Valency
published · living versionsW_zdkhwfnc·v1 · currentpublished
Probing the time-variation of the fine-structure constant: Results based on Si IV doublets from a UVES sample
with Patrick Petitjean, Raghunathan Srianand, Bastien Aracil
1 version
Preprints & journals
71 papers in the corpus · 2004–2026Search for intranight optical variability in a large sample of intermediate-mass black holes2609.03408v1 · Himanshu Sharma, Gopal-Krishna, Vibhore Negi et al.2026 · 0 citationsarXiv
Uncertainty-Aware Deep Learning for the Ly Forest: CNN-Based Absorber Detection and Characterization2607.05494v1 · Paryag Sharma, Vikram Khaire, Ting-Yun Cheng et al.2026 · 0 citationsarXiv
Investigating the Circumgalactic Medium through Mg II absorption coincidence2604.13162v2 · Paryag Sharma, Raghunathan Srianand, Hum Chand et al.2026 · 0 citationsarXiv
Unraveling the mysteries of Jets in peculiar NLSy1 galaxies through multi-wavelength variability2602.09171v2 · Vineet Ojha, Xue-Bing Wu, Luis C. Ho et al.2026 · 0 citationsarXiv
Probing jet-induced optical variability across timescales in radio-loud NLSy1 galaxies2512.11961v1 · Vivek Kumar Jha, Anshul Kumar Sharma, Madhu Sudan et al.2025 · 2 citationsarXiv
Do Low-Mass, Low-Luminosity AGNs Deviate from the Quasar Main Sequence?2512.06068v1 · Himanshu Sharma, Vivek Kumar Jha, Hum Chand et al.2025 · 0 citationsarXiv
Exploring the Origins of Optical Variability in AGNs: Correlations with Black Hole Properties, X-ray, and Radio Emission2508.06610v1 · Vivek Kumar Jha, Debbijoy Bhattacharya, Hum Chand2025 · 0 citationsarXiv
On the incidence of weak and strong Mg II absorbers towards the Flat and Steep Spectrum Radio quasars2507.17866v1 · Ritish Kumar, Sapna Mishra, Hum Chand2025 · 1 citationarXiv
Brightness and colour variability in NLSy1s2504.14004v2 · Madhu Sudan (CUHP), Hum Chand (CUHP), Paul J. Wiita (TCNJ) et al.2025 · 4 citationsMon Not R Astron Soc (2025) 121-131
Circumgalactic medium of quasar host galaxies at 0.4<z<0.8 probed by strong Mg II absorption2503.19968v2 · Paryag Sharma, Raghunathan Srianand, Hum Chand et al.2025 · 1 citationMNRAS, Volume 541, Issue 1, July 2025, Pages 601-609
Weak-emission-line quasars: A new clue from their optical variability2501.16328v1 · Ritish Kumar (CUHP), Gopal-Krishna (CEBS), Hum Chand (CUHP) et al.2025 · 5 citationsarXiv
Star-Formation in Neutral Hydrogen Gas Reservoirs at Cosmic Noon2411.10525v1 · Dharmender (CUHP), Ravi Joshi (IIA), Michele Fumagalli et al.2024 · 1 citationA&A 692, L7 (2024)
Intranight optical monitoring of the rare quasar J0950+5128, the brightest known candidate for transition from radio-quiet to radio-loud state2411.08106v1 · Krishan Chand (CUHP), Gopal-Krishna (CEBS), Hum Chand (CUHP)2024 · 0 citationsPubl. Astron. Soc. Aust. 41 (2024) e106
Status of Astronomy Education in India: A Baseline Survey2406.12308v1 · Moupiya Maji, Surhud More, Aniket Sule et al.2024 · 0 citationsarXiv
Exploring the AGN Accretion Disks using Continuum Reverberation Mapping2307.16568v1 · Vivek Kumar Jha, Ravi Joshi, Jayesh Saraswat et al.2023 · 0 citationsarXiv
Intranight optical variability of TeV blazars with parsec-scale jets dominated by slow-moving radio knots2306.06170v1 · Vibhore Negi (ARIES), Gopal-Krishna (CEBS), Hum Chand (CUHP) et al.2023 · 2 citationsarXiv
Intranight Optical Variability of Blazars and Radio-quiet Quasars using the ZTF Survey2304.11187v1 · Vibhore Negi (ARIES), Gopal-Krishna (CEBS), Ravi Joshi (IIA) et al.2023 · 5 citationsarXiv
The transience and persistence of high optical polarization state in beamed radio quasars2301.06159v1 · Krishan Chand (ARIES), Gopal-Krishna (CEBS), Amitesh Omar (ARIES) et al.2023 · 0 citationsarXiv
Evidence of under-developed torus and broad-line region of weak emission line quasars based on their spectral energy distribution2212.06179v1 · Ritish Kumar, Hum Chand, Ravi Joshi2022 · 4 citationsarXiv
Probable low-frequency quasi-periodic oscillations in blazars from the ZTF survey2210.07266v2 · Anuvab Banerjee, Vibhore Negi, Ravi Joshi et al.2022 · 7 citationsarXiv
Intranight optical variability of low-mass Active Galactic Nuclei: A Pointer to blazar-like activity2210.05186v1 · Gopal-Krishna (CEBS), Krishan Chand (ARIES), Hum Chand (CUHP) et al.2022 · 5 citationsarXiv
Evidence of jet induced optical microvariability in radio-loud Narrow Line Seyfert 1 Galaxies2206.04641v1 · Vineet Ojha, Vivek Kumar Jha, Hum Chand et al.2022 · 10 citationsarXiv
A comparative study of the physical properties for a representative sample of Narrow and Broad-line Seyfert galaxies2112.09150v1 · Vivek Kumar Jha, Hum Chand, Vineet Ojha et al.2021 · 5 citationsarXiv
Intranight variability of UV emission from powerful blazars2112.04516v1 · Krishan Chand (ARIES), Gopal-Krishna (CEBS), Amitesh Omar (ARIES) et al.2021 · 4 citationsarXiv
Optical Flux and Colour Variability of Blazars in the ZTF Survey2112.00790v1 · Vibhore Negi (ARIES), Ravi Joshi (IIA), Krishan Chand (ARIES) et al.2021 · 35 citationsarXiv
Accretion Disk Sizes from Continuum Reverberation Mapping of AGN Selected from the ZTF Survey2109.05036v2 · Vivek Kumar Jha, Ravi Joshi, Hum Chand et al.2021 · 55 citationsarXiv
A Search for Blazar Activity in Broad-Absorption-Line Quasars2108.05332v1 · Sapna Mishra, Gopal-Krishna, Hum Chand et al.2021 · 2 citationsarXiv
Constraining the ratio of median pixel optical depth profile around z ~ 4 quasars using the longitudinal proximity effect2105.01930v1 · Priyanka Jalan, Hum Chand, Raghunathan Srianand2021 · 3 citationsarXiv
Appearance vs Disappearance of broad absorption line troughs in quasars2103.08499v1 · Sapna Mishra, M. Vivek, Hum Chand et al.2021 · 16 citationsarXiv
Intra-night optical variability of ray detected narrow-line Seyfert 1 galaxies2011.00750v2 · Vineet Ojha, Hum Chand, Gopal-Krishna2020 · 8 citationsarXiv
Time Delay Lens Modelling Challenge2006.08619v2 · X. Ding, T. Treu, S. Birrer et al.2020 · 48 citationsMNRAS, (2021), 503, 1096
A comparison of X-ray photon indices among the narrow and broad-line Seyfert 1 galaxies2005.08352v1 · Vineet Ojha, Hum Chand, Gulab Chand Dewangan et al.2020 · 24 citationsarXiv
Comparative intra-night optical variability of X-ray and -ray detected narrow-line Seyfert 1 galaxies2002.03275v1 · Ojha Vineet, Chand Hum, Gopal-Krishna et al.2020 · 12 citationsarXiv
Are there broad absorption-line blazars?1908.01015v1 · Sapna Mishra, Gopal-Krishna, Hum Chand et al.2019 · 4 citationsarXiv
VR CCD photometry of variable stars in globular cluster NGC 41471905.08249v1 · Sneh Lata, A. K. Pandey, J. C. Pandey et al.2019 · 8 citationsarXiv
C IV absorbers tracing cool gas in dense galaxy group/cluster environments1903.04119v1 · Aditya Manuwal, Anand Narayanan, Sowgat Muzahid et al.2019 · 13 citationsMonthly Notices of the Royal Astronomical Society, Volume 485, Issue 1, 1 May 2019, Pages 30-46
Intra-Night Optical monitoring of three {\gamma}-ray detected Narrow-line Seyfert 1 galaxies1811.10555v1 · Vineet Ojha, Gopal-Krishna, Hum Chand2018 · 24 citationsarXiv
Probing the environment of high-z quasars using the proximity effect in projected quasar pairs1809.04614v2 · Priyanka Jalan, Hum Chand, Raghunathan Srianand2018 · 15 citationsarXiv
Deceleration of CIV and SiIV broad absorption lines in X-ray bright quasar SDSS-J092345+5127101808.05622v2 · Ravi Joshi, Raghunathan Srianand, Hum Chand et al.2018 · 17 citationsarXiv
Kpc-scale radio-jets in narrow-line Seyfert 1 galaxies1807.05179v1 · Veeresh Singh, Hum Chand, C. H. Ishwara-Chandra et al.2018 · 0 citationsarXiv
Investigating kpc-scale radio emission properties of narrow-line Seyfert 1 galaxies1807.01945v1 · Veeresh Singh, Hum Chand2018 · 51 citationsarXiv
Polarimetric and spectroscopic study of radio-quiet weak emission line quasars1807.00630v1 · Parveen Kumar, H. Chand, R. Srianand et al.2018 · 4 citationsarXiv
TIFR Near Infrared Imaging Camera-II on the 3.6-m Devasthal Optical Telescope1802.05008v1 · T. Baug, D.K. Ojha, S.K. Ghosh et al.2018 · 19 citationsarXiv
X-ray/UV/optical variability of NGC 4593 with Swift: Reprocessing of X-rays by an extended reprocessor1712.04852v1 · I M McHardy, S D Connolly, K Horne E M Cackett et al.2017 · 131 citationsarXiv
Role of intervening Mg II absorbers on the rotation measure and fractional polarisation of the background quasars1710.10396v3 · Sunil Malik, Hum Chand, T. R. Seshadri2017 · 22 citationsThe Astrophysical Journal, Volume 890, Number 2 (2020)
On the incidence of MgII absorbers along the blazar sightlines1710.04020v1 · S. Mishra, H. Chand, Gopal-Krishna et al.2017 · 7 citationsarXiv
Multi-epoch intra-night optical monitoring of 8 radio-quiet BL Lac candidates1706.04438v1 · P. Kumar, Gopal-Krishna, C. S. Stalin et al.2017 · 6 citationsarXiv
Properties of Narrow line Seyfert 1 galaxies1706.00797v1 · Suvendu Rakshit, C. S. Stalin, Hum Chand et al.2017 · 2 citationsarXiv
A Catalog of Narrow Line Seyfert 1 Galaxies from the Sloan Digital Sky Survey Data Release 121704.07700v1 · Suvendu Rakshit, C. S. Stalin, Hum Chand et al.2017 · 162 citations2017ApJS..229...39R
Probing magnetic fields with Square Kilometre array and its precursors1611.06966v1 · Subhashis Roy, Sharanya Sur, Kandaswamy Subramanian et al.2016 · 4 citationsarXiv
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