A5081523191- Astrophysics and Star Formation Studies
- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Molecular Spectroscopy and Structure
- Astro and Planetary Science
- Atmospheric Ozone and Climate
- Astrophysical Phenomena and Observations
- Spectroscopy and Laser Applications
- Scientific Research and Discoveries
- Astronomical and nuclear sciences
- Advanced Thermodynamic Systems and Engines
- Galaxies: Formation, Evolution, Phenomena
- Advanced Combustion Engine Technologies
- Atomic and Molecular Physics
- SAS software applications and methods
University of Chile
2023-2025
Indian Institute of Science Education and Research, Tirupati
2020-2024
Interstellar molecules are excellent tools for studying the physical and chemical environments of massive star-forming regions. In particular, vibrationally excited HC_3N (HC_3N*) lines key tracers probing hot cores environments. We present Atacama Large Millimeter/submillimeter Array (ALMA) 3 mm observations HC_3N* in 60 investigate how conditions affect excitation transitions. used XCLASS line identification. Under assumption local thermodynamic equilibrium, we derived rotation temperature...
In the star formation process, vital impact of environmental factors such as feedback from massive stars and stellar density on form initial mass function (IMF) at low-mass end is yet to be understood. Hence a systematic, highly sensitive observational analysis sample regions under diverse conditions essential. We analyse IMF eight young clusters ($<$5 Myr), namely IC1848-West, IC1848-East, NGC 1893, 2244, 2362, 6611, Stock 8 Cygnus OB2, which are located Galactocentric distance ($R_g$)...
Identifying members of star-forming regions is an initial step to analyse the properties a molecular cloud complex. In such membership analysis, sensitivity dataset plays significant role in detecting stellar mass up specific limit, which crucial for understanding various properties, as disc evolution and planet formation across different environments. IC 1396 nearby classical region dominated by feedback-driven star activity. this work, we aim identify low-mass member populations complex...
Young stellar clusters are predominantly the hub of star formation and hence, ideal to perform comprehensive studies over least explored sub-stellar regime. Various unanswered questions like mass distribution in brown dwarf regime effect diverse cluster environment on efficiency still plague scientific community. The nearby young cluster, IC 1396 with its feedback-driven environment, is conduct such study. In this paper we adopt a multi-wavelength approach, using deep Subaru HSC, Gaia DR3,...
Abstract Hot cores, as a stage of massive star formation, exhibit abundant line emissions COMs. We present deep survey two isomers C2H6O: ethanol (C2H5OH; EA), and dimethyl ether (CH3OCH3; DE) well their possible precursor CH3OH towards 60 hot cores by using the ALMA 3 mm observations. EA is detected in 40 DE 59 cores. Of these, are simultaneously 39 calculate rotation temperatures column densities XCLASS software. The average temperature higher than that DE, whereas density lower DE....
Abstract HCN and HCO + are the most common dense gas tracers used both in Milky Way external galaxies. The luminosity of J = 1 → 0 lines converted to a mass by conversion factor, α Q . Traditionally, this has been considered constant throughout Galaxy other galaxies, regardless environment. We analyzed 17 outer clouds five inner with metallicities ranging from 0.38 Z ⊙ 1.29 Our analysis indicates that is not constant; instead, it varies metallicity. metallicity-corrected derived entire cloud...
Identifying and characterizing young populations of star-forming regions is crucial to unravel their properties. In this regard, Gaia-DR3 data machine learning tools are very useful for studying large complexes. work, we analyze the $\rm \sim7.1degree^2$ area one our Galaxy's dominant feedback-driven complexes, i.e., region around Trumpler 37. Using Gaussian mixture random forest classifier methods, identify 1243 high-probable members in complex, which $\sim60\%$ new complete down mass limit...
We have mapped HCN and HCO$^{+}$ (J = 1 $\to$ 0) line emission toward a sample of seven star-forming regions (with 12 + log[O/H] range from 8.34 to 8.69) in the outer Milky Way (Galactocentric distance > 9.5 kpc), using 14-meter radio telescope Taeduk Radio Astronomy Observatory (TRAO). compare these two molecular lines with other conventional tracers dense gas, millimeter-wave continuum dust extinction thresholds ($A_{V} \geq 8$ mag), inferred $^{13}$CO data. correlate better millimeter...
The processes which regulate the star-formation within molecular clouds are still not well understood. Various scaling relations have been proposed to explain this issue by formulating a relation between rate surface density ($\rm \Sigma_{SFR}$) and underlying gas \Sigma_{gas}$). In work, we test various star formation relations, such as Kennicutt-Schmidt relation, volumetric orbital time model, crossing multi free-fall scale model towards North American Pelican Nebulae complexes in cold...
ABSTRACT Low-mass star formation inside massive clusters is crucial to understand the effect of cluster environment on processes like circumstellar disc evolution, planet, and brown dwarf formation. The young association Cygnus OB2, with a strong feedback from stars, an ideal target study extreme environmental conditions its extensive low-mass population. We aim perform deep multiwavelength studies role stellar IMF, fraction properties in region. introduce here, deepest widest optical...
This paper presents a multiwavelength investigation of the Galactic HII IRAS 17149$-$3916. Using Giant Meterwave Radio Telescope, India, first low-frequency radio continuum observations at 610 and 1280 MHz for this region are presented. The ionized gas emission displays an interesting cometary morphology which is likely powered by early type source, E4 (IRS-1). origin discussed under framework widely accepted bow shock, champagne flow, clumpy cloud mechanisms. mid- far-infrared data from...
Using new continuum and molecular line data from the ALMA Three-millimeter Observations of Massive Star-forming Regions (ATOMS) survey archival VLA, 4.86 GHz data, we present direct observational evidence hierarchical triggering relating three epochs massive star formation in a ring-like H II region, G24.47+0.49. We find radio flux analysis that it is excited by star(s) spectral type O8.5V-O8V first epoch formation. The swept-up ionized ring structure shows secondary collapse, within this...
ABSTRACT Hub-filament systems are considered as natural sites for high-mass star formation. Kinematic analysis of the surroundings hub-filaments is essential to better understand formation within such systems. In this work, we present a detailed study massive Galactic protocluster IRAS 15394$-$5358, using continuum and molecular line data from ALMA three-millimetre observations star-forming regions (ATOMS) survey. The 3 mm dust map reveals fragmentation ($\rm M=843~{\rm M}_{\odot }$) clump...
Abstract Filaments are believed to play a key role in high-mass star formation. We present systematic study of the filaments and their hosting clumps G35 molecular complex using James Clerk Maxwell Telescope SCUBA-2 850 μ m continuum data. identified five clouds 91 within them, some which form 10 hub–filament systems (HFSs), each with at least three hub-composing filaments. also compiled catalog 350 dense clumps, 183 associated investigated physical properties such as mass, density, size,...
ABSTRACT Young star-forming regions in massive environments are ideal test beds to study the influence of surroundings on evolution discs around low-mass stars. We explore two distant young clusters, IC 1848-East and West located W5 complex. These clusters unique due their similar (distance, age extinction) yet distinct (stellar density far-ultraviolet radiation fields) physical properties. use deep multiband photometry optical, near-infrared mid-infrared wavelengths complete down substellar...
Young star-forming regions in massive environments are ideal test beds to study the influence of surroundings on evolution disks around low-mass stars. We explore two distant young clusters, IC 1848-East and West located W5 complex. These clusters unique due their similar (distance, age, extinction) yet distinct (stellar density FUV radiation fields) physical properties. use deep multi-band photometry optical, near-IR, mid-IR wavelengths complete down substellar limit at least five bands....
Interstellar molecules are excellent tools for studying the physical and chemical environments of massive star-forming regions. In particular, vibrationally excited HC$_3$N (HC$_3$N*) lines key tracers probing hot cores environments. We present Atacama Large Millimeter/submillimeter Array (ALMA) 3 mm observations HC$_3$N* in 60 cores, aiming to investigate how conditions affect excitation transitions. have used XCLASS line identification. Under assumption local thermodynamic equilibrium...
Identifying and characterizing young populations of star-forming regions is crucial to unravel their properties. In this regard, Gaia-DR3 data machine learning tools are very useful for studying large complexes. work, we analyze the $\rm \sim7.1degree^2$ area one our Galaxy's dominant feedback-driven complexes, i.e., region around Trumpler 37. Using Gaussian mixture random forest classifier methods, identify 1243 high-probable members in complex, which $\sim60\%$ new complete down mass limit...
We have mapped HCN and HCO$^{+}$ (J = 1 $\to$ 0) line emission toward a sample of seven star-forming regions (with 12 + log[O/H] range from 8.34 to 8.69) in the outer Milky Way (Galactocentric distance > 9.5 kpc), using 14-meter radio telescope Taeduk Radio Astronomy Observatory (TRAO). compare these two molecular lines with other conventional tracers dense gas, millimeter-wave continuum dust extinction thresholds ($A_{V} \geq 8$ mag), inferred $^{13}$CO data. correlate better millimeter...