Rupali Chandar
A5077792471- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Galaxies: Formation, Evolution, Phenomena
- Astrophysics and Star Formation Studies
- Astrophysical Phenomena and Observations
- Gamma-ray bursts and supernovae
- Astronomical Observations and Instrumentation
- Adaptive optics and wavefront sensing
- Spectroscopy and Laser Applications
- History and Developments in Astronomy
- Astro and Planetary Science
- Scientific Research and Discoveries
- Photocathodes and Microchannel Plates
- Relativity and Gravitational Theory
- Cosmology and Gravitation Theories
- Astrophysics and Cosmic Phenomena
- Remote Sensing in Agriculture
- Advanced Statistical Methods and Models
- CCD and CMOS Imaging Sensors
- Leaf Properties and Growth Measurement
- Economic Growth and Productivity
- Radio Astronomy Observations and Technology
- Atmospheric Ozone and Climate
- Pulsars and Gravitational Waves Research
- Spectroscopy and Chemometric Analyses
University of Toledo
2015-2024
University of Opole
2010
Johns Hopkins University
1995-2008
Carnegie Observatories
2006-2008
Space Telescope Science Institute
2003-2006
Abstract We present PHANGS–ALMA, the first survey to map CO J = 2 → 1 line emission at ∼1″ ∼100 pc spatial resolution from a representative sample of 90 nearby ( d ≲ 20 Mpc) galaxies that lie on or near z 0 “main sequence” star-forming galaxies. traces bulk distribution molecular gas, which is cold, phase interstellar medium. At achieved by each beam reaches size typical individual giant cloud, so these data can be used measure demographics, life cycle, and physical state clouds across...
The Legacy ExtraGalactic UV Survey (LEGUS) is a Cycle 21 Treasury program on the Hubble Space Telescope aimed at investigation of star formation and its relation with galactic environment in nearby galaxies, from scales individual stars to those ∼kiloparsec-size clustered structures. Five-band imaging near-ultraviolet I band Wide-Field Camera 3 (WFC3), plus parallel optical Advanced for Surveys (ACS), being collected selected pointings 50 galaxies within local 12 Mpc. filters used...
PHANGS-HST is an ultraviolet-optical imaging survey of 38 spiral galaxies within ~20 Mpc. Combined with the PHANGS-ALMA, PHANGS-MUSE surveys and other multiwavelength data, dataset will provide unprecedented look into connections between young stars, HII regions, cold molecular gas in these nearby star-forming galaxies. Accurate distances are needed to transform measured observables physical parameters (e.g., brightness luminosity, angular sizes clouds, star clusters associations). has...
Abstract The PHANGS program is building the first data set to enable multiphase, multiscale study of star formation across nearby spiral galaxy population. This effort enabled by large survey programs with Atacama Large Millimeter/submillimeter Array (ALMA), MUSE on Very Telescope, and Hubble Space Telescope (HST), which we have obtained CO(2–1) imaging, optical spectroscopic mapping, high-resolution UV–optical respectively. Here, present PHANGS-HST, has NUV– U – B V I imaging disks 38...
The PHANGS collaboration has been building a reference dataset for the multi-scale, multi-phase study of star formation and interstellar medium in nearby galaxies. With successful launch commissioning JWST, we can now obtain high-resolution infrared imaging to probe youngest stellar populations dust emission on scales clusters molecular clouds ($\sim$5-50 pc). In Cycle 1, is conducting an 8-band survey from 2-21$\mu$m 19 spiral CO(2-1) mapping, optical integral field spectroscopy, UV-optical...
The first JWST observations of nearby galaxies have unveiled a rich population bubbles that trace the stellar feedback mechanisms responsible for their creation. Studying these therefore allows us to chart interaction between and interstellar medium, larger galactic flows needed regulate star formation processes globally. We present catalog in NGC628, visually identified using MIRI F770W PHANGS-JWST observations, use them statistically evaluate bubble characteristics. classify 1694...
Abstract The PHANGS project is assembling a comprehensive, multiwavelength data set of nearby (∼5–20 Mpc), massive star-forming galaxies to enable multiphase, multiscale investigations into the processes that drive star formation and galaxy evolution. To date, large survey programs have provided molecular gas (CO) cubes with Atacama Large Millimeter/submillimeter Array, optical integral field unit (IFU) spectroscopy Very Telescope/Multi-Unit Spectroscopic Explorer (MUSE), high-resolution...
We determine the age distribution of star clusters in Antennae galaxies (NGC 4038/9) for two mass-limited samples (M > 3 × 104 M☉ and M 2 105 M☉). This is based on integrated broadband UBVI narrowband Hα photometry from deep images taken with Hubble Space Telescope. find that declines steeply, approximately as dN/dτ ∝ τ-1. The median ~107 yr, which we interpret evidence rapid disruption ("infant mortality"). It very likely most young are not gravitationally bound were disrupted near times...
The Advanced Camera for Surveys and the Near Infrared Multi-Object Spectrometer (NICMOS) have been used to obtain new Hubble Space Telescope images of NGC 4038/4039 ("The Antennae"). These observations allow us better differentiate compact star clusters from individual stars, based on both size color. We use this ability extend cluster luminosity function (LF) by approximately 2 mag over our previous WFPC2 results, find that it continues as a single power law, dN/dL ∝ Lα with α = −2.13 ±...
We present the first study of high-precision internal proper motions (PMs) in a large sample globular clusters, based on Hubble Space Telescope (HST) data obtained over past decade with ACS/WFC, ACS/HRC, and WFC3/UVIS instruments. determine PMs for 1.3 million stars central regions 22 median number ∼60,000 per cluster. These have potential to significantly advance our understanding kinematics clusters by extending line-of-sight (LOS) velocity measurements two- or three-dimensional...
We present a framework for understanding the demographics of star cluster systems and develop toy model that incorporates universal initial power-law mass function, selected formation histories, disruption laws, convolution with common artifacts selection effects found in observational data. A wide variety observations can be explained by this simple model, including observed correlation between brightest young galaxy total number clusters. The confirms understood as statistical...
We report the large effort which is producing comprehensive high-level young star cluster (YSC) catalogues for a significant fraction of galaxies observed with Legacy ExtraGalactic UV Survey (LEGUS) Hubble treasury program. present methodology developed to extract positions, verify their genuine nature, produce multiband photometry (from NUV NIR), and derive physical properties via spectral energy distribution fitting analyses. use nearby spiral galaxy NGC628 as test case demonstrating...
We present color-magnitude diagram analysis of deep Hubble Space Telescope imaging a mass-limited sample 18 intermediate-age (1 - 2 Gyr old) star clusters in the Magellanic Clouds, including 8 for which new data was obtained. find that ${\it all}$ our feature extended main sequence turnoff (eMSTO) regions are wider than can be accounted by simple stellar population (including unresolved binary stars). FWHM widths MSTOs indicate age spreads 200-550 Myr. evaluate dynamical evolution with and...
We present a high-resolution view of bubbles within The Phantom Galaxy (NGC 628); nearby (~10Mpc), star-forming (~2Msun/yr), face-on (i~9deg) grand-design spiral galaxy. With new data obtained as part the PHANGS-JWST treasury program, we perform detailed case-study two regions interest, one which contains largest and most prominent bubble in galaxy (The Void; over 1kpc diameter), other being smaller region that may be precursor to such large Precursor Void). When comparing matched resolution...
Abstract A primary new capability of JWST is the ability to penetrate dust in star-forming galaxies identify and study properties young star clusters that remain embedded gas. In this Letter we combine infrared images taken with our optical Hubble Space Telescope (HST) starbursting barred (Seyfert2) spiral galaxy NGC 1365. We find has richest population massive any known within 30 Mpc, ∼30 are more than 10 6 M ⊙ younger Myr. Sixteen these newly discovered from observations. An examination...
Abstract Large-scale bars can fuel galaxy centers with molecular gas, often leading to the development of dense ringlike structures where intense star formation occurs, forming a very different environment compared galactic disks. We pair ∼0.″3 (30 pc) resolution new JWST/MIRI imaging archival ALMA CO(2–1) mapping central ∼5 kpc nearby barred spiral NGC 1365 investigate physical mechanisms responsible for this extreme formation. The gas morphology is resolved into two well-known bright bar...
Abstract PHANGS–JWST mid-infrared (MIR) imaging of nearby spiral galaxies has revealed ubiquitous filaments dust emission in intricate detail. We present a pilot study to systematically map the filament network (DFN) at multiple scales between 25 and 400 pc NGC 628. MIRI images 7.7, 10, 11.3, 21 μ m 628 are used generate maps emission, while PHANGS–HST B -band yields attenuation features. quantify correspondence traced by MIR thermal continuum/polycyclic aromatic hydrocarbon (PAH) detected...
We present a comparison of theoretical predictions dust continuum and polycyclic aromatic hydrocarbon (PAH) emission with new JWST observations in three nearby galaxies: NGC 628, 1365, 7496. Our analysis focuses on total 1063 compact stellar clusters 2654 associations previously characterized by HST the galaxies. find that distributions trends observed PAH-focused infrared colors generally agree expectations, bulk is more aligned models larger, ionized PAHs. These data usher era probing...
The newly installed Wide Field Camera 3 (WFC3) on the Hubble Space Telescope has been used to obtain multi-band images of nearby spiral galaxy M83. These new observations are deepest and highest resolution ever taken a grand-design spiral, particularly in near-ultraviolet, allow us better differentiate compact star clusters from individual stars measure luminosities even faint U band. We find that luminosity function (LF) for outside very crowded starburst nucleus can be approximated by...
We use new WFC3 observations of the nearby grand design spiral galaxy M83 to develop two independent methods for estimating ages young star clusters. The first method uses physical extent and morphology Halpha emission estimate clusters younger than tau ~10 Myr. It is based on simple premise that gas in very (tau < few Myr) largely coincident with cluster stars, a small, ring-like structure surrounding stars slightly older (e.g., ~5 Myr), larger bubble still (i.e., ~5-10 Myr). second an...
We discuss new photometry from high-resolution images of 7 intermediate-age (1-2 Gyr) star clusters in the Large Magellanic Cloud taken with Advanced Camera for Surveys on board Hubble Space Telescope. fit color-magnitude diagrams (CMDs) several different sets theoretical isochrones, and determine systematic uncertainties population parameters when derived using any one set isochrones. The cluster CMDs show interesting features, including extended main sequence turnoff (MSTO) regions, narrow...
We present new tests for disruption mechanisms of star clusters based on the bivariate mass-age distribution g(M,\tau). In particular, we derive formulae g(M,\tau) two idealized models in which rate depends masses and one it does not. then compare these with our Hubble Space Telescope observations Antennae galaxies over domain can readily distinguish from individual stars: \tau\la10^7(M/10^4 M_{\odot})^{1.3} yr. find that mass-dependent are poor fits to data, even complete freedom adjust...
We compare the observed mass functions and age distributions of star clusters in six well-studied galaxies: Milky Way, Magellanic Clouds, M83, M51, Antennae. In combination, these span wide ranges age: $10^2\lea M/M_{\odot}\lea10^6$ $10^6\lea\tau/yr \lea10^9$. confirm that are well represented by power laws: $dN/dM\propto M^{\beta}$ with $\beta \approx-1.9$ $dN/d\tau\propto\tau^{\gamma}$ $\gamma\approx -0.8$. The approximately independent each other, ruling out simple models mass-dependent...
We estimate the fraction of stars that form in compact clusters (bound and unbound), Gamma_F, a diverse sample eight star-forming galaxies, including two irregulars, dwarf starbursts, spirals, mergers. The average value for our is Gamma_F ~ 24 +/- 9%. also calculate survive to ages between t1 t2, denoted by Gamma_S(t1,t2), find Gamma_S(10,100)=4.6 2.5% Gamma_S(100,400)=2.4 1.1 %, significantly lower than same galaxies. do not any systematic trends or Gamma_S with star formation rate (SFR),...
It has recently been established that the properties of young star clusters (YSCs) can vary as a function galactic environment in which they are found. We use cluster catalogue produced by Legacy Extragalactic UV Survey (LEGUS) collaboration to investigate spiral galaxy M51. analyse population galactocentric distance and arm inter-arm regions. The mass exhibits similar shape at all radial bins, described power law with slope close $-2$ an exponential truncation around $10^5\ \rm{M}_{\odot}$...