A5044322298- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Gamma-ray bursts and supernovae
- Stellar, planetary, and galactic studies
- Astronomical Observations and Instrumentation
- Advanced Vision and Imaging
- Remote Sensing in Agriculture
- Astrophysical Phenomena and Observations
- Astrophysics and Cosmic Phenomena
Institute of Astronomy and Astrophysics, Academia Sinica
2017-2022
National Taiwan University
2017-2021
The identification of high-redshift massive galaxies with old stellar populations may pose challenges to some models galaxy formation. However, securely classify a as quiescent, it is necessary exclude significant ongoing star formation, something that can be challenging achieve at high redshift. In this letter, we analyse deep ALMA/870um and SCUBA-2/450um imaging the claimed "post-starburst" ZF-20115 z=3.717 exhibits strong Balmer break absorption lines. far-infrared reveals luminous...
We present ALMA 870um and JCMT SCUBA2 850um dust continuum observations of a sample optically dark strongly lensed galaxies in the cluster fields. The reach median rms about 0.11 mJy 0.44 mJy, respectively, with latter close to confusion limit data at 850um. This represents one most sensitive searches for emission galaxies. detect 12 out 15 >3.8 sigma, corresponding detection rate 80 per cent. Thanks gravitational lensing, our deeper limiting flux than previous surveys blank fields by factor...
Abstract We present a study of the connection among black hole accretion, star formation, and galaxy morphology at <?CDATA $z\leqslant 2.5$?> . focus on active galactic nuclei (AGNs) selected by their mid-IR power-law emission. By fitting optical to far-IR photometry with state-of-the-art spectral energy distribution (SED) techniques, we derive stellar masses, formation rates, dust properties, AGN contributions in galaxies over whole COSMOS field. find that obscured AGNs lie within or...
Recent progress in submillimetre surveys by single-dish telescopes allows us to further challenge the consistency between cosmological simulations and observations. In particular, we compare our that include dust formation destruction with recent SCUBA-2 (`STUDIES') putting emphases on basic observational properties of emission such as temperature, size infrared (IR)-emitting region, IR luminosity function IRX--$\beta$ relation. After confirming models reproduce local galaxy properties,...
Abstract We present far-infrared (FIR) properties of an extremely luminous infrared galaxy (ELIRG) at z spec = 3.703, WISE J101326.25+611220.1 (WISE 1013+6112). This ELIRG is selected as IR-bright dust-obscured based on the photometry from Sloan Digital Sky Survey and Wide-field Infrared Explorer ( ). In order to derive its accurate IR luminosity, we perform follow-up observations 89 154 μ m using High-resolution Airborne Wideband Camera-plus (HAWC+) board 2.7 Stratospheric Observatory For...
Wide-field sub-millimetre surveys have driven many major advances in galaxy evolution the past decade, but without extensive follow-up observations coarse angular resolution of these limits science exploitation. This has development various analytical deconvolution methods. In last half a decade Generative Adversarial Networks been used to attempt deconvolutions on optical data. Here we present an autoencoder with novel loss function overcome this problem sub-millimeter wavelength range....
We present the discovery of an extremely-luminous dust-obscured galaxy (DOG) at $z_{\rm spec}$ = 3.703, WISE J101326.25+611220.1. This DOG is selected as a candidate infrared (IR) galaxies based on photometry from Sloan Digital Sky Survey and Wide-field Infrared Explorer. In order to derive its accurate IR luminosity, we perform follow-up observations 450 850 $\mu$m using Submillimetre Common User Bolometer Array 2 James Clerk Maxwell Telescope, 870 1300 Submillimeter Array, which enable us...
We analyze an extremely deep 450-$\mu$m image ($1\sigma=0.56$\,mJy\,beam$^{-1}$) of a $\simeq 300$\,arcmin$^{2}$ area in the CANDELS/COSMOS field as part SCUBA-2 Ultra Deep Imaging EAO Survey (STUDIES). select robust (signal-to-noise ratio $\geqslant 4$) and flux-limited ($\geqslant 4$\,mJy) sample 164 sub-millimeter galaxies (SMGs) at that have $K$-band counterparts COSMOS2015 catalog identified from radio or mid-infrared imaging. Utilizing this SMG 4705 $K$-band-selected non-SMGs reside...
We use machine learning techniques to investigate their performance in classifying active galactic nuclei (AGNs), including X-ray selected AGNs (XAGNs), infrared (IRAGNs), and radio (RAGNs). Using known physical parameters the Cosmic Evolution Survey (COSMOS) field, we are able well-established training samples region of Hyper Suprime-Cam (HSC) survey. compare several Python packages (e.g., scikit-learn, Keras, XGBoost), XGBoost identify show accuracy, precision, recall, F1 score, AUROC)....
Abstract We present confusion-limited SCUBA-2 450 μ m observations in the COSMOS-CANDELS region as part of James Clerk Maxwell Telescope Large Program Ultra Deep Imaging EAO Survey. Our maps at and 850 cover an area arcmin 2 . achieved instrumental noise levels σ = 0.59 mJy beam −1 0.09 deepest each map. The corresponding confusion are estimated to be 0.65 0.36 Above 4 (3.5 ) threshold, we detected 360 (479) sources 237 (314) m. derive blank-field number counts m, covering flux-density range...
Abstract We construct a SCUBA-2 450 μ m map in the COSMOS field that covers an area of 300 arcmin 2 and reaches 1 σ noise level 0.65 mJy deepest region. extract 256 sources detected at with signal-to-noise ratios >4.0 analyze physical properties their multiwavelength counterparts. find most are z ≲ 3, median <?CDATA $z={1.79}_{-0.15}^{+0.03} \% $?> . About ${35}_{-25}^{+32} our classified as starburst galaxies based on total star formation rates (SFRs) stellar masses ( M * ). By fitting...
We examine the robustness of color-color selection quiescent galaxies (QGs) against contamination dusty star-forming using latest submillimeter data. selected 18,304 QG candidates out to $z\sim$ 3 commonly adopted $NUV-r-J$ based on high-quality multi-wavelength COSMOS2015 catalog. Using extremely deep 450 and 850 $\mu$m catalogs from JCMT SCUBA-2 Large Programs, S2COSMOS, STUDIES, as well ALMA submillimeter, VLA GHz, $Spitzer$ MIPS 24 catalogs, we identified luminous among candidates. also...
We present structural parameters and morphological properties of faint 450-um selected submillimeter galaxies (SMGs) from the JCMT Large Program, STUDIES, in COSMOS-CANDELS region. Their are compared to an 850um a matched star-forming samples. investigate stellar structures 169 sources (S450=2.8-29.6mJy; S/N>4) at z<3 using HST near-infrared observations. Based on our spectral energy distribution fitting, half such SMGs (LIR=10^11.65+-0.98Lsun) lie above star-formation rate (SFR)/stellar...
We present confusion-limited SCUBA-2 450-$\mu$m observations in the COSMOS-CANDELS region as part of JCMT Large Program, Ultra Deep Imaging EAO Survey (STUDIES). Our maps at 450 and 850 $\mu$m cover an area arcmin$^2$. achieved instrumental noise levels $\sigma_{\mathrm{450}}=$ 0.59 mJy beam$^{-1}$ $\sigma_{\mathrm{850}}=$ 0.09 deepest each map. The corresponding confusion are estimated to be 0.65 0.36 beam$^{-1}$. Above 4 (3.5) $\sigma$ threshold, we detected 360 (479) sources 237 (314)...