Explanipedia

Magnetic Activities of GJ 1151: Flares in TESS Data and Radio Observation in uGMRT Open

Soumen Mondal, Anandmayee Tej, Tapas Baug, Samrat Ghosh · 2025

GJ 1151 is a nearby (8 pc), quiescent mid-M dwarf (M 4.5V) of older age, made especially interesting by the hypothesized presence of a close-in planet invoked to explain its low-frequency radio emission. We analyzed the flaring activity of…

The ALMA-QUARKS Survey. III. Clump-to-core Fragmentation and Searches for High-mass Starless Cores Open

Dongting Yang, Hongli Liu, Tie Liu, Xunchuan Liu, Fengwei Xu , et al. · 2025

The Querying Underlying mechanisms of massive star formation with ALMA-Resolved gas Kinematics and Structures (QUARKS) survey observed 139 infrared-bright (IR-bright) massive protoclusters at 1.3 mm wavelength with the Atacama Large Millim…

The ALMA-ATOMS Survey: Exploring Protostellar Outflows in HC$_3$N Open

Ariful Hoque, Tapas Baug, L. K. Dewangan, Anandmayee Tej, P. F. Goldsmith , et al. · 2025

We present the first systematic study of bipolar outflows using HC$_3$N as a tracer in a sample of 146 massive star-forming regions from ALMA-ATOMS survey. Protostellar outflows arise at the initial stage of star formation as a consequence…

JWST-ALMA study of a hub-filament system in the nascent phase Open

N. K. Bhadari, O. R. Jadhav, Ariful Hoque, L. E. Pirogov, Franklin Goldsmith , et al. · 2025

Context. Star clusters, including high-mass stars, form within hub-filament systems (HFSs). Observations of HFSs that remain unaffected by feedback from embedded stars are rare yet crucial for understanding the mass inflow process in high-…

JWST-ALMA Study of a Hub-Filament System in the Nascent Phase Open

N. K. Bhadari, L. K. Dewangan, O. R. Jadhav, Ariful Hoque, L. E. Pirogov , et al. · 2024

Star clusters, including high-mass stars, form within hub-filament systems (HFSs). Observations of HFSs that remain unaffected by feedback from embedded stars are rare yet crucial for understanding the mass inflow process in high-mass star…

The Milky Way atlas for linear filaments – II. Clump rotation versus filament orientation Open

Xuefang Xu, Ke Wang, Qian Gou, Tapas Baug, Di Li , et al. · 2024

Dense clumps distributed along filaments are the immediate medium for star formation. Kinematic properties of the clumps, such as velocity gradient and angular momentum, combined with filament orientation, provide important clues to the fo…

The Milky Way atlas for linear filaments II. clump rotation versus filament orientation Open

Xuefang Xu, Ke Wang, Qian Gou, Tapas Baug, Di Li , et al. · 2024

Dense clumps distributed along filaments are the immediate medium for star formation. Kinematic properties of the clumps, such as velocity gradient and angular momentum, combined with filament orientation, provide important clues to the fo…

Detection of High-frequency Pulsation in WR 135: Investigation of Stellar Wind Dynamics Open

Subhajit Kar, Ramkrishna Das, Blesson Mathew, Tapas Baug, Avijit Mandal · 2024

We report the detection of high-frequency pulsations in WR 135 from short-cadence (10 minute) optical photometric and spectroscopic time series surveys. The harmonics up to the sixth order are detected from the integrated photometric flux …

ALMA-IMF. XIV. Free–Free Templates Derived from H41α and Ionized Gas Content in 15 Massive Protoclusters Open

Roberto Galván-Madrid, D. Díaz-González, F. Motte, Adam Ginsburg, N. Cunningham , et al. · 2024

We use the H41 α recombination line to create templates of the millimeter free–free emission in the ALMA-IMF continuum maps, which allows us to separate it from dust emission. This method complements spectral-index information and extrapol…

Direct Observational Evidence of Multi-epoch Massive Star Formation in G24.47+0.49 Open

Anindya Saha, Anandmayee Tej, Hongli Liu, Tie Liu, Guido Garay , et al. · 2024

Using new continuum and molecular line data from the Atacama Large Millimeter/submillimeter Array Three-millimeter Observations of Massive Star-forming Regions (ATOMS) survey and archival Very Large Array, 4.86 GHz data, we present direct …

ALMA-IMF XV: The core mass function in the high-mass star-formation regime Open

F. Louvet, P. Sanhueza, Amelia M. Stutz, A. Men’shchikov, F. Motte , et al. · 2024

The stellar initial mass function (IMF) is critical to our understanding of star formation and the effects of young stars on their environment. On large scales, it enables us to use tracers such as UV or Halpha emission to estimate the sta…

ALMA-IMF XIV: Free-Free Templates Derived from H$41α$ and Ionized Gas Content in Fifteen Massive Protoclusters Open

Roberto Galván-Madrid, D. Díaz-González, F. Motte, Adam Ginsburg, N. Cunningham , et al. · 2024

We use the H$41α$ recombination line to create templates of the millimeter free-free emission in the ALMA-IMF continuum maps, which allows to separate it from dust emission. This method complements spectral-index information and extrapolat…

Direct observational evidence of multi-epoch massive star formation in G24.47+0.49 Open

Anindya Saha, Anandmayee Tej, Hongli Liu, Tie Liu, Guido Garay , et al. · 2024

Using new continuum and molecular line data from the ALMA Three-millimeter Observations of Massive Star-forming Regions (ATOMS) survey and archival VLA, 4.86 GHz data, we present direct observational evidence of hierarchical triggering rel…

ALMA-IMF Open

R. H. Álvarez-Gutiérrez, Amelia M. Stutz, N. A. Sandoval-Garrido, F. Louvet, F. Motte , et al. · 2024

The ALMA-IMF Large Program provides multi-tracer observations of 15 Galactic massive protoclusters at a matched sensitivity and spatial resolution. We focus on the dense gas kinematics of the G353.41 protocluster traced by N 2 H + (1−0), w…

Investigation of [KSF2015] 1381-19L, a WC9-type Star in the High-extinction Galactic Region Open

Subhajit Kar, Ramkrishna Das, Tapas Baug · 2024

We report on a multiwavelength study of the Wolf–Rayet star [KSF2015] 1381-19L, which is located in the solar metallicity region ( Z = 0.014) of the Milky Way, strongly obscured by interstellar dust. We perform a detailed characterization …

Influence of mid-infrared Galactic bubble on surroundings: A case study on IRAS 16489-4431 Open

Ariful Hoque, Tapas Baug, L. K. Dewangan, Ke Wang, Tie Liu , et al. · 2024

We studied the influence of a massive star on a mid-infrared bubble and its surrounding gas in the IRAS\,16489-4431 star-forming region using multi-wavelength data. The {\it Spitzer} mid-infrared band images revealed the shocked nature of …

The Milky Way atlas for linear filaments Open

Ke Wang, Yifei Ge, Tapas Baug · 2024

Context. Filamentary structure is important for the ISM and star formation. Galactic distribution of filaments may regulate the star formation rate in the Milky Way. However, interstellar filaments are intrinsically complex, making them di…

Detection of high-frequency pulsation in WR 135: investigation of stellar wind dynamics Open

Subhajit Kar, Ramkrishna Das, Tapas Baug, Blesson Mathew, Avijit Mandal · 2024

We report the detection of high-frequency pulsations in WR\,135 from short cadence (10\,minutes) optical photometric and spectroscopic time series surveys. The harmonics up to $6^{th}$ order are detected from the integrated photometric flu…

Study of Complex Nitrogen and Oxygen-bearing Molecules toward the High-mass Protostar IRAS 18089–1732 Open

Arijit Manna, Sabyasachi Pal, Tapas Baug, Sougata Mondal · 2024

The observation of oxygen (O)- and nitrogen (N)-bearing molecules gives an idea about the complex prebiotic chemistry in the interstellar medium. Recent millimeter and submillimeter wavelength observations have shown the presence of comple…

Star Formation in the H ii Region Sh2-87: Evidence of Global Hierarchical Collapse Open

Siddhartha Biswas, Soumen Mondal, Ariful Hoque, Alik Panja, Tapas Baug , et al. · 2024

We present a detailed study of the Sh2-87 H ii region using a multiwavelength data set in optical to radio bands. A Herschel column density map revealed that the host cloud is filamentary in nature, and together they formed a central dense…

The ALMA-QUARKS Survey: Detection of Two Extremely Dense Substructures in a Massive Prestellar Core Open

Xiaofeng Mai, Tie Liu, Xunchuan Liu, Lei Zhu, Guido Garay , et al. · 2024

Only a handful of massive starless core candidates have been discovered so far, but none of them have been fully confirmed. Within the MM1 clump in the filamentary infrared dark cloud G34.43+0.24 that was covered by the Atacama Large Milli…

Deciphering the hidden structures of HH 216 and Pillar IV in M16: results from <i>JWST</i> and <i>HST</i> Open

L. K. Dewangan, O. R. Jadhav, A. K. Maity, N. K. Bhadari, Saurabh Sharma , et al. · 2024

To probe the star formation process, we present an observational investigation of the Pillar IV and an ionized knot HH 216 in the Eagle Nebula (M16). Pillar IV is known to host a Class I protostar that drives a bipolar outflow. The outflow…

Deciphering the Hidden Structures of HH 216 and Pillar IV in M16: Results from JWST and HST Open

L. K. Dewangan, O. R. Jadhav, A. K. Maity, N. K. Bhadari, Saurabh Sharma , et al. · 2024

To probe the star formation process, we present an observational investigation of the Pillar IV and an ionized knot HH 216 in the Eagle Nebula (M16). Pillar IV is known to host a Class I protostar that drives a bipolar outflow. The outflow…

The ALMA-QUARKS survey: Detection of two extremely dense substructures in a massive prestellar core Open

Xiaofeng Mai, Tie Liu, Xunchuan Liu, Lei Zhu, Guido Garay , et al. · 2024

Only a handful of massive starless core candidates have been discovered so far, but none of them have been fully confirmed. Within the MM1 clump in the filamentary infrared dark cloud G34.43+0.24 that was covered by the ALMA-ATOMS survey a…

Proceedings of the 3rd BINA Workshop: Scientific Potential of Indo-Belgian Co-operation Open

Santosh Joshi, P. De Cat, M. De Becker, K. Kolenberg, Soumen Mondal , et al. · 2024

In this report, we present an overview of the 3rd BINA workshop hosted by ARIES, Nainital on a broad theme the Scientific potential of the Indo-Belgian co-operation. Further, an introduction of the proceedings of the 3rd BINA workshop is a…

ALMA-IMF. IX. Catalog and Physical Properties of 315 SiO Outflow Candidates in 15 Massive Protoclusters Open

A. P. M. Towner, Adam Ginsburg, P. Dell’Ova, A. Gusdorf, Sylvain Bontemps , et al. · 2023

We present a catalog of 315 protostellar outflow candidates detected in SiO J = 5 − 4 in the ALMA-IMF Large Program, observed with ∼2000 au spatial resolution, 0.339 km s −1 velocity resolution, and 2–12 mJy beam −1 (0.18–0.8 K) sensitivit…

Feedback from protoclusters does not significantly change the kinematic properties of the embedded dense gas structures Open

Jianwen Zhou, Sami Dib, F. Wyrowski, Tie Liu, Shuhua Li , et al. · 2023

A total of 64 ATOMS sources at different evolutionary stages were selected to investigate the kinematics and dynamics of gas structures under feedback. We identified dense gas structures based on the integrated intensity map of H 13 CO + J…

Feedback from protoclusters does not significantly change the kinematic properties of the embedded dense gas structures Open

J. W. Zhou, Sami Dib, F. Wyrowski, Tie Liu, Shanghuo Li , et al. · 2023

A total of 64 ATOMS sources at different evolutionary stages were selected to investigate the kinematics and dynamics of gas structures under feedback. We identified dense gas structures based on the integrated intensity map of H$^{13}$CO$…

Observational Evidence of the Merging of Filaments and Hub Formation in G083.097+03.270 Open

Alik Panja, L. K. Dewangan, Tapas Baug, Wen-Ping Chen, Yan Sun , et al. · 2023

We uncover a hub–filament system correlated with massive young stellar associations in G083.097+03.270. Diagnosed with simultaneous 12 CO, 13 CO, and C 18 O line observations, the region is found to host two distinct and elongated filament…

Figure Sets, Catalog Tables, and Other Technical Materials Related to "ALMA-IMF IX: Catalog and Physical Properties of 315 SiO Outflow Candidates in 15 Massive Protoclusters" Open

A. P. M. Towner, Adam Ginsburg, P. Dell’Ova, A. Gusdorf, S. Bontemps , et al. · 2023

This Zenodo DOI contains additional data products and technical files for the publication "ALMA-IMF IX: Catalog and Physical Properties of 315 SiO Outflow Candidates in 15 Massive Protoclusters" (Towner et al. 2024). All files, metadata, a…

Tapas Baug YOU? Author Swipe