Yiqing Song
A5064042254- Galaxies: Formation, Evolution, Phenomena
- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Astronomy and Astrophysical Research
- Astrophysical Phenomena and Observations
- Gamma-ray bursts and supernovae
- Radio Astronomy Observations and Technology
- Spectroscopy and Laser Applications
- Science Education and Perceptions
- Astrophysics and Cosmic Phenomena
- Astronomical Observations and Instrumentation
- Ocular Diseases and Behçet’s Syndrome
- Adaptive optics and wavefront sensing
- Solar and Space Plasma Dynamics
- Outdoor and Experiential Education
- European and International Law Studies
- Inertial Sensor and Navigation
- Ocular Infections and Treatments
- Calibration and Measurement Techniques
- Cervical Cancer and HPV Research
- Retinal and Optic Conditions
- Precipitation Measurement and Analysis
- Scientific Measurement and Uncertainty Evaluation
- Scientific Research and Discoveries
- Animal and Plant Science Education
Atacama Large Millimeter Submillimeter Array
2023-2024
European Southern Observatory
2022-2024
University of Virginia
2019-2023
National Radio Astronomy Observatory
2022-2023
McCormick (United States)
2019-2023
Seoul National University
2005
Abstract We present James Webb Space Telescope (JWST) Mid-Infrared Instrument (MIRI) integral-field spectroscopy of the nearby merging, luminous infrared galaxy, NGC 7469. This galaxy hosts a Seyfert type-1.5 nucleus, highly ionized outflow, and bright, circumnuclear star-forming ring, making it an ideal target to study active galactic nucleus (AGN) feedback in local universe. take advantage high spatial/spectral resolution JWST/MIRI isolate regions surrounding central properties dust warm...
Abstract We present mid-infrared spectroscopic observations of the nucleus nearby Seyfert galaxy NGC 7469 taken with MIRI instrument on James Webb Space Telescope (JWST) as part Directors Discretionary Time Early Release Science program 1328. The high-resolution nuclear spectrum contains 19 emission lines covering a wide range ionization. high-ionization show broad, blueshifted reaching velocities up to 1700 km s −1 and FWHM ranging from ∼500 1100 . width broad broad-to-narrow line flux...
Abstract We present James Webb Space Telescope (JWST) Near Infrared Spectrograph (NIRSpec) integral field spectroscopy of the nearby luminous infrared galaxy NGC 7469. take advantage high spatial/spectral resolution and wavelength coverage JWST/NIRSpec to study 3.3 μ m neutral polycyclic aromatic hydrocarbon (PAH) grain emission on ∼200 pc scales. A clear change in average properties between star-forming ring central AGN is found. Regions vicinity AGN, with [Ne iii ]/[Ne ii ] > 0.25, tend...
Abstract We present new JWST NIRSpec integral field spectroscopy (IFS) data for the luminous infrared galaxy NGC 7469, a nearby (70.6 Mpc) active with Seyfert 1.5 nucleus that drives highly ionized gas outflow and prominent nuclear star-forming ring. Using superb sensitivity high spatial resolution of instrument IFS, we investigate role in excitation dynamics circumnuclear gas. Our analysis focuses on [Fe ii ], H 2 , hydrogen recombination lines trace radiation/shocked-excited molecular...
The merger of two or more galaxies can enhance the inflow material from galactic scales into close environments Active Galactic Nuclei (AGN), obscuring and feeding supermassive black hole (SMBH). Both recent simulations observations AGN in mergers have confirmed that are related to strong nuclear obscuration. However, it is still unclear how obscuration evolves last phases process. We study a sample 60 Luminous Ultra-luminous IR (U/LIRGs) GOALS observed by NuSTAR. find fraction Compton-thick...
Abstract The nearby, luminous infrared galaxy NGC 7469 hosts a Seyfert nucleus with circumnuclear star-forming ring and is thus the ideal local laboratory for investigating starburst–AGN (active galactic nucleus) connection in detail. We present integral-field observations of central 1.3 kpc region obtained JWST Mid-InfraRed Instrument. Molecular ionized gas distributions kinematics at resolution ∼100 pc over 4.9–7.6 μ m are examined to study dynamics influenced by AGN. low-ionization [Fe ii...
We present results from the James Webb Space Telescope (JWST) Director's Discretionary Time Early Release Science (ERS) program 1328 targeting nearby, Luminous Infrared Galaxy (LIRG), VV 114. use MIRI and NIRSpec instruments to obtain integral-field spectroscopy of heavily obscured Eastern nucleus (V114E) surrounding regions. The spatially resolved, high-resolution, spectra reveal physical conditions in gas dust over a projected area 2-3 kpc that includes two brightest IR sources, NE SW...
Abstract The enormous increase in mid-IR sensitivity and spatial spectral resolution provided by the JWST spectrographs enables, for first time, detailed extragalactic studies of molecular vibrational bands. This opens an entirely new window study interstellar medium luminous infrared galaxies (LIRGs). We present a analysis rovibrational bands gas-phase CO, H 2 O, C , HCN toward heavily obscured eastern nucleus LIRG VV 114, as observed NIRSpec spectrograph on Mid-InfraRed Instrument (MIRI...
James Webb Space Telescope (JWST) Mid-InfraRed Instrument (MIRI) images of the luminous infrared (IR) galaxy VV 114 are presented. This redshift ~ 0.020 merger has a western component (VV 114W) rich in optical star clusters and an eastern 114E) hosting mid-IR nucleus hidden at UV wavelengths by dust lanes. With MIRI, 114E resolves primarily into bright NE SW cores separated 630 pc. comprises 45% 15um light 114, with having IR luminosities, L_ (8-1000um) 8+/-0.8x10^10 L_sun 5+/-0.5x10^10...
Abstract We present the results of a James Webb Space Telescope NIRCam investigation into young massive star cluster (YMC) population in luminous infrared galaxy VV 114. identify 374 compact YMC candidates with signal-to-noise ratios ≥ 3, 5, and 5 at F150W, F200W, F356W, respectively. A direct comparison our HST catalog reveals that ∼20% these sources are undetected optical wavelengths. Based on yggdrasil stellar models, we 17 JWST imaging alone F150W – F200W F356W colors suggesting they all...
We present IRAM-30m Telescope $^{12}$CO and $^{13}$CO observations of a sample 55 luminous ultraluminous infrared galaxies (LIRGs ULIRGs) in the local universe. This is subset Great Observatory All-Sky LIRG Survey (GOALS), for which we use ancillary multi-wavelength data to better understand their interstellar medium star formation properties. Fifty-three (96%) are detected $^{12}$CO, 29 (52%) also above 3$\sigma$ level. The median full width at zero intensity (FWZI) velocity CO line...
The molecular Kennicutt-Schmidt (mK-S) Law has been key for understanding star formation (SF) in galaxies across all redshifts. However, recent sub-kpc observations of nearby reveal deviations from the nearly unity slope (N) obtained with disk-averaged measurements. We study SF and gas (MG) distribution early-stage luminous infrared galaxy merger Arp240 (NGC5257-8). Using VLA radio continuum (RC) ALMA CO(2-1) a uniform grid analysis, we estimate rates MG surface densities...
Studying the interstellar medium in nearby starbursts is essential for understanding physical mechanisms driving these objects, thought to resemble young star-forming galaxies. This study aims analyze properties of first spatially-resolved multi-wavelength SED an extragalactic source, spanning six decades frequency (from near-UV cm wavelengths) at angular resolution 3$^{\prime\prime}$ (51 pc distance NGC,253). We focus on central molecular zone (CMZ) NGC,253, which contains giant clouds...
Abstract We introduce a prescription for estimating the flux of 7.7 μ m and 11.3 polycyclic aromatic hydrocarbon (PAH) features from broadband JWST/MIRI images. Probing PAH with MIRI imaging data has advantages in field view, spatial resolution, sensitivity compared spectral maps, but comparisons spectra are needed to calibrate these estimations over wide variety environments. For 267 MIRI/MRS independent regions four luminous infrared galaxies (LIRGs) Great Observatories All-sky LIRG Survey...
We present James Webb Space Telescope (JWST) imaging of NGC 7469 with the Near-Infrared Camera (NIRCam) and Mid-InfraRed Instrument (MIRI). is a nearby, $z=0.01627$, luminous infrared galaxy (LIRG) that hosts both Seyfert Type-1.5 nucleus circumnuclear starburst ring radius $\sim$0.5 kpc. The new near-infrared (NIR) JWST reveals 66 star-forming regions, 37 which were not detected by HST observations. Twenty-eight sources have very red NIR colors indicate obscurations up to A$_{\rm{v}}\sim7$...
Abstract Nuclear rings are excellent laboratories for studying intense star formation. We present results from a study of nuclear star-forming in five nearby normal galaxies the Star Formation Radio Survey (SFRS) and four local LIRGs Great Observatories All-sky LIRG at sub-kiloparsec resolutions using Very Large Array high-frequency radio continuum observations. find that ring formation (NRSF) contributes 49%–60% total LIRGs, compared to 7%–40% galaxies. characterize 57 individual regions...
We present the analysis of $\sim 100$pc-scale compact radio continuum sources detected in 63 local (Ultra) Luminous Infrared Galaxies (U/LIRGs; $L_{\rm IR} \ge 10^{11} L_\odot$), using FWHM $\lesssim 0''.1 - 0''.2$ resolution 15 and 33 GHz observations with Karl G. Jansky Very Large Array. identify a total 133 effective radii 8 170pc, which are classified into four main categories -- "AGN" (AGN), "AGN/SBnuc" (AGN-starburst composite nucleus), "SBnuc" (starburst nucleus) "SF" (star-forming...
We present the results of a Hubble Space Telescope WFC3 near-UV and ACS/WFC optical study into star cluster populations 10 luminous ultra-luminous infrared galaxies (U/LIRGs) in Great Observatories All-Sky LIRG Survey (GOALS). Through integrated broadband photometry we have derived ages, masses, extinctions for total 1027 clusters with $d_{L} <$ 110 Mpc order to avoid issues related blending. The measured age distribution slope $dN/d\tau \propto \tau^{-0.5 +/- 0.2}$ is steeper than what has...
Abstract We present the results of a James Webb Space Telescope NIRCam and NIRSpec investigation into young massive star cluster (YMC) population NGC 3256, most cluster-rich luminous infrared galaxy in Great Observatories All Sky LIRG Survey. detect 3061 compact YMC candidates with signal-to-noise ratio ≥3 at F150W, F200W, F335M. Based on yggdrasil stellar models, we identify 116/3061 sources F150W – F200W > 0.47 F355M −1.37 colors, suggesting that they are ( t ≤ 5 Myr), dusty A V =...
We have used the Mid-InfraRed Instrument (MIRI) on James Webb Space Telescope (JWST) to obtain first spatially resolved, mid-infrared (mid-IR) images of IIZw096, a merging luminous infrared galaxy (LIRG) at $z = 0.036$. Previous observations with Spitzer suggested that vast majority total IR luminosity (LIR) system originated from small region outside two nuclei. New JWST/MIRI now allow an accurate measurement location and density source is responsible for bulk emission. estimate 40-70%...
Abstract We present the first results of a high-resolution Karl G. Jansky Very Large Array imaging survey luminous and ultra-luminous infrared galaxies (U/LIRGs) in Great Observatories All-sky LIRG Survey. From full sample 68 galaxies, we have selected 25 (LIRGs) that show resolved extended emission at sufficient sensitivity to image individual regions star formation activity beyond nucleus. With wideband radio continuum observations, which frequency range from 3 33 GHz, made extinction-free...
Abstract Star formation in galaxies is regulated by heating and cooling the interstellar medium (ISM). In particular, processing of molecular gas into stars will depend strongly on ratio to neutral around sites recent star formation. this work, we combine mid-infrared (mid-IR) observations polycyclic aromatic hydrocarbons (PAHs), dominant mechanism ISM, with [C ii ], [O i [Si ] fine-structure emission, strongest channels dense, gas. The IR line emission PAH measures photoelectric efficiency,...
Abstract We present James Webb Space Telescope (JWST) integral-field spectrograph observations of NGC 3256, a local infrared-luminous late-stage merging system with two nuclei roughly 1 kpc apart, both which have evidence cold molecular outflows. Using JWST/NIRSpec and Mid-Infrared Instrument data sets, we investigate this morphologically complex on spatial scales <100 pc, where focus the warm H 2 gas surrounding nuclei. detect collimated outflowing originating from southern nucleus,...
When asked to draw a scientist, elementary school students tend conceive of scientists as male, with third half the drawing stereotypical appearance and/or are performing activity.
We report the detection of stimulated hydrogen radio recombination line (RRL) emission from ionized gas in a $z=0.89$ galaxy using 580--1670 MHz observations MeerKAT Absorption Line Survey (MALS). The RRL originates that intercepts and strongly lenses blazar PKS 1830-211 ($z=2.5$). This is second RRLs outside local universe first clearly associated with hydrogen. detect effective H144$\alpha$ (and H163$\alpha$) transitions at observed frequencies 1156 (798) by stacking 17 (27) 21$\sigma$...