Explanipedia

The Atomic Gas Properties of Green Pea Galaxies: Connections to Lyman Continuum Leakage Open

Archishman Khasnovis, Nissim Kanekar, Sangeeta Malhotra, James E. Rhoads · 2025

We have used the Green Bank Telescope to search for H i 21 cm emission from 30 Green Pea galaxies (GPs) at z ≈ 0.012–0.045, obtaining 7 detections of H i 21 cm emission and 17 upper limits on the H i mass. Including GPs from the literature…

High-resolution Giant Metrewave Radio Telescope H{\sc i} 21\,cm imaging of the host galaxy of FRB\,20250316A Open

B. Kaur, Nissim Kanekar, J. X. Prochaska · 2025

We report Giant Metrewave Radio Telescope (GMRT) \hii\ imaging of NGC\,4141, the host galaxy of FRB\,20250316A at $z=0.0063$. Our GMRT \hii\ images have spatial resolutions, at $z\approx0.0063$, of $\approx0.48-8.0$~kpc, and find evidence …

The atomic gas properties of Green Pea galaxies: Connections to Lyman continuum leakage Open

Archishman Khasnovis, Nissim Kanekar, Sangeeta Malhotra, James E. Rhoads · 2025

We have used the Green Bank Telescope to search for H{\sc{i}} 21\,cm emission from 30 Green Pea galaxies (GPs) at $z\approx0.012-0.045$, obtaining 7 detections of H{\sc{i}} 21\,cm emission and 17 upper limits on the H{\sc{i}} mass. Includi…

A [C ii] 158 μm Survey of Damped Lyα Absorber Galaxies at z ∼ 4: Observations of Dense and Metal-enriched Neutral Gas within the Circumgalactic Medium of Star-forming Galaxies Open

Marcel Neeleman, Nissim Kanekar, J. X. Prochaska, Marc Rafelski, Lordrick Kahinga · 2025

We present a survey undertaken with the Atacama Large Millimeter/submillimeter Array (ALMA) to study the galaxies associated with a representative sample of 16 damped Ly α absorbers (DLAs) at z ≈ 4.1–4.5, using the [C ii ] 158 μ m ([C ii ]…

A Massive H i-absorption-selected Galaxy at z ≈ 2.356 Open

B. Kaur, Nissim Kanekar, Marcel Neeleman, Yongda Zhu, J. X. Prochaska , et al. · 2025

We use the Karl G. Jansky Very Large Array (VLA) and the Atacama Large Millimeter/submillimeter Array to detect CO(1–0), CO(3–2), and rest-frame 349 GHz continuum emission from an H i -selected galaxy, DLA1020+2733g, at z ≈ 2.3568 in the f…

A massive HI-absorption-selected galaxy at $z\approx2.356$ Open

B. Kaur, Nissim Kanekar, Yongda Zhu, X. Prochaska · 2025

We use the Karl G. Jansky Very Large Array (VLA) and the Atacama Large Millimeter/submillimeter Array (ALMA) to detect $\rm CO(1-0)$, $\rm CO(3-2)$, and rest-frame 349-GHz continuum emission from an HI-selected galaxy, DLA1020+2733g, at $z…

The Second Case of a Major Merger Triggering a Starburst in a Green Pea Galaxy Open

Sonalika Purkayastha, Nissim Kanekar, Sangita Kumari, James E. Rhoads, Sangeeta Malhotra , et al. · 2024

We have used the Karl G. Jansky Very Large Array (VLA) to map H i 21 cm emission from the Green Pea galaxy GP J1148+2546 at z ≈ 0.0451, only the second measurement of the H i spatial distribution of a Green Pea. The VLA H i 21 cm image, th…

An Hi-absorption-selected Cold Rotating Disk Galaxy at z ≈ 2.193 Open

B. Kaur, Nissim Kanekar, Marcel Neeleman, Marc Rafelski, J. X. Prochaska , et al. · 2024

We have used the Atacama Large Millimeter/submillimeter Array to map CO(3–2) emission from a galaxy, DLA-B1228g, associated with the high-metallicity damped Ly α absorber at z ≈ 2.1929 toward the QSO PKS B1228–113. At an angular resolution…

The Hi Mass Function of Star-forming Galaxies at z ≈ 1 Open

Aditya Chowdhury, Nissim Kanekar, Jayaram N. Chengalur · 2024

We present the first estimate, based on direct H i 21 cm observations, of the H i mass function (H i MF) of star-forming galaxies at z ≈ 1, obtained by combining our measurement of the scaling relation between H i mass ( M H i ) and B -ban…

The HI Mass Function of Star-forming Galaxies at $z\approx1$ Open

Aditya Chowdhury, Nissim Kanekar, Jayaram N. Chengalur · 2024

We present the first estimate, based on direct HI 21 cm observations, of the HI mass function (HIMF) of star-forming galaxies at $z\approx1$, obtained by combining our measurement of the scaling relation between HI mass ($M_{HI}$) and B-ba…

The radio-loud fraction of quasars at z > 6 Open

Pascal M Keller, Nithyanandan Thyagarajan, Ajay Kumar, Nissim Kanekar, G. Bernardi · 2024

Quasars at redshifts z > 6 are an excellent probe of the formation and evolution of supermassive black holes in the early Universe. The population of radio-luminous quasars is of particular interest, as such quasars could potentially be…

A Survey of Lyα Emission around Damped Lyα Absorbers at z ≈ 2 with the Keck Cosmic Web Imager Open

Grecco A. Oyarzún, Marc Rafelski, Nissim Kanekar, J. X. Prochaska, Marcel Neeleman , et al. · 2024

We present Keck Cosmic Web Imager Ly α integral field spectroscopy of the fields surrounding 14 damped Ly α absorbers (DLAs) at z ≈ 2. Of these 14 DLAs, nine have high metallicities ([M/H] > − 0.3), and four of those nine feature a CO-emit…

A high-velocity narrow absorption line outflow in the quasar J212329.46 - 005052.9 Open

Frederick Hamann, Nissim Kanekar, J. X. Prochaska, M. T. Murphy, Nikola Milutinović , et al. · 2024

We report on the discovery of a high-velocity narrow absorption line outflow in the redshift 2.3 quasar J212329.46 − 005052.9. Five distinct outflow systems are detected with velocity shifts from −9710 to −14 050 km s−1 and C iv λλ1548, 15…

A survey of Ly$α$ emission around Damped Ly$α$ absorbers at $z \approx 2$ with the Keck Cosmic Web Imager Open

Grecco A. Oyarzún, Marc Rafelski, Nissim Kanekar, J. X. Prochaska, Marcel Neeleman , et al. · 2023

We present Keck Cosmic Web Imager (KCWI) Ly$α$ integral field spectroscopy of the fields surrounding 14 Damped Ly$α$ absorbers (DLAs) at $z \approx 2$. Of these 14 DLAs, 9 have high metallicities ([M/H]$~> -0.3$), and 4 of those 9 feature …

The Gas Accretion Rate of Galaxies over z ≈ 0–1.3 Open

Aditya Chowdhury, Nissim Kanekar, Jayaram N. Chengalur · 2023

We present here estimates of the average rates of accretion of neutral gas onto main-sequence galaxies and the conversion of atomic gas to molecular gas in these galaxies at two key epochs in galaxy evolution: (i) z ≈ 1.3–1.0, toward the e…

The Gas Accretion Rate of Galaxies over $z\approx0-1.3$ Open

Aditya Chowdhury, Nissim Kanekar, Jayaram N. Chengalur · 2023

We present here estimates of the average rates of accretion of neutral gas onto main-sequence galaxies and the conversion of atomic gas to molecular gas in these galaxies at two key epochs in galaxy evolution: (i) $z\approx1.3-1.0$, toward…

The Gas Accretion Rate of Star-forming Galaxies over the Last 4 Gyr Open

Apurba Bera, Nissim Kanekar, Jayaram N. Chengalur, J. S. Bagla · 2023

Star-forming galaxies are believed to replenish their atomic gas reservoir, which is consumed in star formation, through accretion of gas from their circumgalactic mediums (CGMs). However, there are few observational constraints today on t…

The Gas Accretion Rate of Star-forming Galaxies over the last 4 Gyr Open

Apurba Bera, Nissim Kanekar, Jayaram N. Chengalur, J. S. Bagla · 2023

Star-forming galaxies are believed to replenish their atomic gas reservoir, which is consumed in star-formation, through accretion of gas from their circumgalactic mediums (CGMs). However, there are few observational constraints today on t…

Atomic Hydrogen Scaling Relations at z ≈ 0.35 Open

Apurba Bera, Nissim Kanekar, Jayaram N. Chengalur, J. S. Bagla · 2023

The atomic hydrogen (H i ) properties of star-forming galaxies in the local universe are known to correlate with other galaxy properties via the “H i scaling relations.” The redshift evolution of these relations serves as an important cons…

Atomic hydrogen scaling relations at $z \approx 0.35$ Open

Apurba Bera, Nissim Kanekar, Jayaram N. Chengalur, J. S. Bagla · 2023

The atomic hydrogen (HI) properties of star-forming galaxies in the local Universe are known to correlate with other galaxy properties via the ``HI scaling relations''. The redshift evolution of these relations serves as an important const…

Towards gender equity in Indian astronomy Open

Aru Beri, P. Shastri, Ravinder K. Banyal, Debarati Chatterjee, Ritaban Chatterjee , et al. · 2023

Atomic Gas Scaling Relations of Star-forming Galaxies at z ≈ 1 Open

Aditya Chowdhury, Nissim Kanekar, Jayaram N. Chengalur · 2022

We use the Giant Metrewave Radio Telescope Cold-H i AT z ≈ 1 (CAT z 1) survey, a 510 hr H i 21 cm emission survey of galaxies at z = 0.74–1.45, to report the first measurements of atomic hydrogen (H i ) scaling relations at z ≈ 1. We divid…

The Hi Mass Function of Star-forming Galaxies at z ∼ 0.35 Open

Apurba Bera, Nissim Kanekar, Jayaram N. Chengalur, J. S. Bagla · 2022

The neutral atomic hydrogen (H i ) mass function (H i MF) describes the distribution of the H i content of galaxies at any epoch; its evolution provides an important probe of models of galaxy formation and evolution. Here, we report Giant …

The HI mass function of star-forming galaxies at $\mathbf{z \sim 0.35}$ Open

Apurba Bera, Nissim Kanekar, Jayaram N. Chengalur, J. S. Bagla · 2022

The neutral atomic hydrogen (HI) mass function (HIMF) describes the distribution of the HI content of galaxies at any epoch; its evolution provides an important probe of models of galaxy formation and evolution. Here, we report Giant Metre…

The Giant Metrewave Radio Telescope Cold-Hi AT z ≈ 1 Survey Open

Aditya Chowdhury, Nissim Kanekar, Jayaram N. Chengalur · 2022

We describe the design, data analysis, and basic results of the Giant Metrewave Radio Telescope Cold-H i AT z ≈ 1 (GMRT-CAT z 1) survey, a 510 hr upgraded GMRT H i 21 cm emission survey of galaxies at z = 0.74−1.45 in the DEEP2 survey fiel…

Atomic Gas Dominates the Baryonic Mass of Star-forming Galaxies at z ≈ 1.3 Open

Aditya Chowdhury, Nissim Kanekar, Jayaram N. Chengalur · 2022

We present a comparison between the average atomic gas mass, 〈 M Atom 〉 (including hydrogen and helium), the average molecular gas mass, 〈 M Mol 〉, and the average stellar mass, 〈 M ⋆ 〉, of a sample of star-forming galaxies at z ≈ 0.75–1.4…

Atomic Gas Dominates the Baryonic Mass of Star-forming Galaxies at $z \approx 1.3$ Open

Aditya Chowdhury, Nissim Kanekar, Jayaram N. Chengalur · 2022

We present a comparison between the average atomic gas mass, $\langle M_{Atom}\rangle$ (including HI and He), the average molecular gas mass, $\langle M_{Mol}\rangle$, and the average stellar mass, $\langle M_*\rangle$, of a sample of star…

Author Correction: H i 21-centimetre emission from an ensemble of galaxies at an average redshift of one Open

Aditya Chowdhury, Nissim Kanekar, Jayaram N. Chengalur, Shiv K. Sethi, K. S. Dwarakanath · 2022

A Massive, Dusty, Hi Absorption–Selected Galaxy at z ≈ 2.46 Identified in a CO Emission Survey Open

B. Kaur, Nissim Kanekar, Mitchell Revalski, Marc Rafelski, Marcel Neeleman , et al. · 2022

We report a NOrthern Extended Millimeter Array (NOEMA) and Atacama Large Millimeter/submillimeter Array search for redshifted CO emission from the galaxies associated with seven high-metallicity ([M/H] ≥ −1.03) damped Ly α absorbers (DLAs)…

Jansky Very Large Array Detections of CO(1–0) Emission in H i-absorption-selected Galaxies at z ≳ 2 Open

B. Kaur, Nissim Kanekar, Marc Rafelski, Marcel Neeleman, J. X. Prochaska , et al. · 2022

We report a Karl G. Jansky Very Large Array search for redshifted CO(1–0) emission from three H i -absorption-selected galaxies at z ≈ 2, identified earlier in their CO(3–2) or CO(4–3) emission. We detect CO(1–0) emission from DLA B1228-11…

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