A5064459363- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Astro and Planetary Science
- Astronomy and Astrophysical Research
- Atomic and Molecular Physics
- Spectroscopy and Chemometric Analyses
- Molecular Spectroscopy and Structure
- Atmospheric Ozone and Climate
- Advanced Clustering Algorithms Research
- Astrophysical Phenomena and Observations
- Spectroscopy and Laser Applications
- Spacecraft and Cryogenic Technologies
University of Maryland, College Park
2018-2023
FEEDBACK is a SOFIA legacy program dedicated to study the interaction of massive stars with their environment. It performs survey 11 galactic high mass star forming regions in 158 $μ$m (1.9 THz) line CII and 63 (4.7 OI. We employ 14 pixel LFA 7 HFA upGREAT instrument spectrally resolve (0.24 MHz) these FIR structure lines. With an observing time 96h, we will cover $\sim$6700 arcmin$^2$ at 14.1$''$ angular resolution for 6.3$''$ OI line. The observations started spring 2019 (Cycle 7). Our aim...
We present [CII] 158 $\mu$m and [OI] 63 observations of the bipolar HII region RCW 36 in Vela C molecular cloud, obtained within SOFIA legacy project FEEDBACK, which is complemented with APEX $^{12/13}$CO(3-2) Chandra X-ray (0.5-7 keV) data. This shows that ring, forming waist nebula, expands a velocity 1 - 1.9 km s$^{-1}$. also observe an increased linewidth ring indicating turbulence driven by energy injection from stellar feedback. The cavity hosts blue-shifted expanding shells at...
Ionized gas probes the influence of massive stars on their environment. The Cygnus X region (d~1.5 kpc) is one most star forming complexes in our Galaxy, which Cyg OB2 association (age 3-5 Myr and stellar mass $2 \times 10^{4}$ M$_{\odot}$) has a dominant influence. We observe at 148 MHz using Low Frequency Array (LOFAR) take into account short-spacing information during image deconvolution. Together with data from Canadian Galactic Plane Survey, we investigate morphology, distribution,...
We quantified the effects of stellar feedback in RCW 49 by determining physical conditions different regions using [CII] 158 $\mu$m and [OI] 63 observations from SOFIA, $^{12}$CO (3-2) APEX H$_2$ line Spitzer telescopes. Large maps were observed with SOFIA telescopes, while only available towards three small areas. From our qualitative analysis, we found that 0-0 S(2) emission probes denser gas compared to S(1) line. In four ("northern cloud", "pillar", "ridge", "shell"), updated PDR Toolbox...
Abstract We investigate the physical structure and conditions of photodissociation regions (PDRs) molecular gas within Pillars Creation in Eagle Nebula using SOFIA FEEDBACK observations [C ii ] 158 μ m line. These are velocity resolved to 0.5 km s −1 analyzed alongside a collection complimentary data with similar spatial spectral resolution: [O i 63 line, also observed SOFIA, rotational lines CO, HCN, HCO + , CS, N 2 H . Using superb resolution APEX, CARMA, BIMA, we reveal relationships...
We present a new set of measurements obtained with the Combined Array for Research in Millimeter-wave Astronomy (CARMA) Jupiter's microwave thermal emission near 1.3 cm ammonia (NH$_{3}$) absorption band. use these observations to investigate mole fraction upper troposphere, $0.3 < P 2$ bar, based on radiative transfer modeling. find that must be $\sim2.4\times 10^{-4}$ below NH$_{3}$ ice cloud, i.e., at $0.8 8$ agreement results by de Pater et al. (2001, 2016a). cloud-forming region between...
Abstract We explore the potential of Gaussian mixture model (GMM), an unsupervised machine-learning method, to identify coherent physical structures in interstellar medium. The implementation we present can be used on any kind spatially and spectrally resolved data set. provide a step-by-step guide use these models different sources sets. Following guide, run NGC 1977, RCW 120, 49 using [C ii ] 158 μ m mapping observations from SOFIA telescope. find that identified six, four, five velocity...
Abstract We unveil the stellar wind–driven shell of luminous massive star-forming region RCW 49 using SOFIA FEEDBACK observations [C ii ] 158 μ m line. The complementary data set 12 CO and 13 J = 3 → 2 transitions is observed by APEX telescope probes dense gas toward 49. Using spatial spectral resolution provided telescopes, we disentangle from a complex individual components centered around find that radius ∼6 pc expanding at velocity km s −1 observer. Comparing our with ancillary X-ray,...
We investigate the physical structure and conditions of photodissociation regions (PDRs) molecular gas within Pillars Creation in Eagle Nebula using SOFIA FEEDBACK observations [C II] 158 micron line. These are velocity resolved to 0.5 km s$^{-1}$ analyzed alongside a collection complimentary data with similar spatial spectral resolution: [O I] 63 line, also observed SOFIA, rotational lines CO, HCN, HCO$^{+}$, CS, N$_2$H$^{+}$. Using superb resolution APEX, CARMA, BIMA, we reveal...
We explore the potential of Gaussian Mixture Model (GMM), an unsupervised machine learning method, to identify coherent physical structures in ISM. The implementation we present can be used on any kind spatially and spectrally resolved data set. provide a step-by-step guide use these models different sources sets. Following guide, run NGC 1977, RCW 120 49 using [CII] 158 $\mu$m mapping observations from SOFIA telescope. find that identified 6, 4 5 velocity 49, respectively, which are...
We present [CII] 158 $μ$m and [OI] 63 observations of the bipolar HII region RCW 36 in Vela C molecular cloud, obtained within SOFIA legacy project FEEDBACK, which is complemented with APEX $^{12/13}$CO(3-2) Chandra X-ray (0.5-7 keV) data. This shows that ring, forming waist nebula, expands a velocity 1 - 1.9 km s$^{-1}$. also observe an increased linewidth ring indicating turbulence driven by energy injection from stellar feedback. The cavity hosts blue-shifted expanding shells at...