Chao-Wei Tsai

Professor and Senior Research Scientist


Address:     National Astronomical Observatories, CAS

                   20A Datun Road, Chaoyang District, Beijing, China

Post code:  100010

Research Areas

1) Extreme star formation activities and star cluster formation

2) Active galactic nucleus - black hole accretion and AGN feedback

3) Dwarf galxies in the local universe

4) Supermassive black hole mergers at intermediate redshift

5) Hyperluminous galaxies at high redshift

6) Applicaitons of machine learning on the astrophysical studies


2000-09--2009-09    University of California, Los Angeles            Ph.D. in Astronomy 

1998-09--2000-07    Nat'l Central University                                 M.S. in Astronomy 

1994-10--1998-06    Nat'l Taiwan Univerisity                                 B.S. in Physics


Work Experience

2018-10~present,       National Astronomical Observatories, CAS,     Senior Research Scientist 

2016-02~2018-09,      University of California, Los Angeles,               Assitant Researcher

2012-10~2016-02,      NASA Jet Propulsion Laboratory,                     NASA Postdoctoral Program Fellow

2009-09~2012-10,      IPAC, California Institute of Technology,           Postdoctoral Scholar

Teaching Experience

2008 Summer,            University of California, Los Angeles,               Graduate Student Instructor

2005 - 2008,               University of California, Los Angeles,               Teaching Fellow

2003 - 2005,               University of California, Los Angeles,               Teaching Assistant


2020              Natoinal Science Fundation General Program 

2018              Pioneer Hundred Talents Program (Technical Expert category), 

                      Chinese Academy of Sciences

2016              NASA Group Achievement Awards, WISE Hot Dust Obscured Galaxy Team

2012              NASA Achievement Awards, WISE Science Data Center Team 

2012 - 2015   NASA Postdoctoral Program Fellowship, 

                                                      at Jet Propulsion Laboratory, NASA/Caltech

2011              NASA/JPL Team STAR Award, 

                         for contribution to NASA Wide-field Infrared Explorer Team at IPAC, Caltech 


(55) Yi Feng, Di Li, Zheng Zheng, & Chao-Wei Tsai “Supermassive binary black hole evolution can be traced by a small SKA pulsar timing array”, Physcial Review D, accepted [arXiv: 2005.11118]

(54) J.I. Penney, A. W. Blain, R. J. Assef, et al. includiing Chao-Wei Tsai; “Cold Molecular Gas and Free-Free Emission from Hot, Dust-Obscured Galaxies at z 3”, Monthly Notices of the Royal Astronomical Society, in press [arXiv: 2006.08400]

(53) R. J. Assef, M. Brightman, D. J. Walton, et al. including Chao-Wei Tsai; “Hot Dust-Obscured Galaxies with Excess Blue Light”, The Astrophysical Journal, accepted [arXiv: 1905.04320]
(52) H. D. Jun,, R. J. Assef, F. E. Bauer, et al. including Chao-Wei Tsai; “Spec- tral Classification and Ionized Gas Outflows in z 2 WISE-Selected Hot Dust- Obscured Galaxies”, The Astrophysical Journal, 888, 110 (2020) [arXiv: 1911.09828]

(51)T.H. Jarrett, M.E. Cluver, M.J.I. Brown, et al. including Chao-Wei Tsai; “The WISE Extended Source Catalogue (WXSC) I: The 100 Largest Galaxies”, The Astrophysical Journal Supplement Series, 245, 25 (2019) [arXiv: 1910.11793]

(50) S.E. Lake, E.L. Wright, R.J. Assef, et al. including Chao-Wei Tsai; “The Contribution of Galaxies to the 3.4 micron Cosmic Infrared Background as Measured Using WISE”, The Astrophysical Journal, 887, 207 (2019) [arXiv: 1908.00731] 

(49) J. I. Penney, A. W. Blain, D. Wylezalek et al., including Chao-Wei Tsai; “The Environments of Luminous Radio – WISE Selected Infrared Galaxies”, Monthly Notices of the Royal Astronomical Society, 483, 514 (2019) [arXiv:1811.06818]

(48) Tanio Diaz Santos, Roberto Assef, Andrew Blain, Chao-Wei Tsai et al.; “The Multiple Merger Assembly of a Hyper-luminous Obscured Quasar at z = 4.6”, Science, 362, 1034 (2018) DOI: 10.1126/science.aap7605 [arXiv:1811.05992]

(47) Chao-Wei Tsai, Peter Eisenhardt, Hyunsung Jun et al.; ‘Super-Eddington Accretion in the WISE-Selected Extremely Luminous Infrared Galaxy W22460526”, The Astrophysical Journal, 868, 1 (2018) [arXiv:1810.02933]

(46) S. E. Lake, E. L. Wright, R. J. Assef et al., including Chao-Wei Tsai; “The 2.4μmGalaxy Luminosity Function as Measured Using WISE. III. Measurement Results”, The Astrophysical Journal, 866, 45 (2018) [arXiv:1702.07829]

(45) S. E. Lake, E. L. Wright, R. J. Assef et al., including Chao-Wei Tsai; “The 2.4μmGalaxy Luminosity Function as Measured Using WISE. II. Sample Selec- tion”, The Astrophysical Journal, 866, 44 (2018) [arXiv:1702.07828]

(44) J. Wu, H. D. Jun, R. J. Assef, Chao-Wei Tsai et al.; “Eddington-Limited Accretion in z 2 WISE-selected Hot, Dust-Obscured Galaxies”, The Astrophysical Journal, 852, 96 (2018) [arXiv:1703.06888]

(43) F. Vito, W. N. Brandt, P. Eisenhardt et al., including Chao-Wei Tsai; “Chandra Probes Heavy Obscuration in the Most-Luminous Galaxies Discovered by WISE”, Monthly Notices of the Royal Astronomical Society, 474, 4528 (2018) [arXiv:1712.00031]

(42) D. Farrah, S. Petty, B. Connolly et al., including Chao-Wei Tsai; “The Mor- phological of Assembling Galaxies Hosting Luminous, Obscured AGN at ∼ 2”, The Astrophysical Journal, 844, 106, (2017) [arXiv:1705.02649]

(41) S. F. Jones, A. W. Blain, C. Lonsdale et al., including Chao-Wei Tsai; “Overdensities of SMGs around WISE-selected Ultra-Luminous, High-Redshift Galaxies”, Monthly Notices of the Royal Astronomical Society, 469, 4565, (2017) [arXiv:1705.03680]

(40) S. E. Lake, E. L. Wright, Chao-Wei Tsai, & A. Lam “The 2.4μmGalaxy Luminosity Function as Measured Using WISE. I. Measurement Techniques”, The Astronomical Journal, 153, 189 (2017) [arXiv:1604.07493]

(39) C. Ricci, R. J. Assef, D. Stern et al., including Chao-Wei Tsai; “NuSTAR Observations of WISE J1036+0449, a Galaxies at ∼ Obscured by Hot Dust”, The Astronomical Journal, 835, 105, (2017) [arXiv:1609.04808]

(38) Yinghe Zhao, Lin Yan, and Chao-Wei Tsai; “Properties of Interstellar Medium In Infrared Bright QSOs Probed by [O I] 63 μm and [C II] 158 μm Emis- sion Lines”, The Astrophysical Journal, 824, 2 (2016) [arXiv:1603.07920]

(37) R. J. Assef, D. J. Walton, M. Brightman et al., including Chao-Wei Tsai “Hot Dust Obscured Galaxies with Excess Blue Light: Dual AGN or Single AGN under Extreme Conditions?”, The Astrophysical Journal, 819, 111 (2016) [arXiv:1511.05155]

(36) Tanio Diaz Santos, Roberto Assef, Andrew Blain, Chao-Wei Tsai et al.; “The Strikingly Uniform, Highly Turbulent Interstellar Medium of the Most Lu- minous Galaxy in the Universe”, The Astrophysical Journal Letter, 816, 6 (2016) [arXiv:1511.04079]

(35) Carol J. Lonsdale, Mark Lacy, Amy Kimbell, et al., including Chao-Wei Tsai; “Radio Jet Feedback and Star Formation in Heavily Obscured, Hyperlumi- nous Quasars at Redshift ∼ 0.5–3. I: ALMA Observations”, The Astrophysical Journal, 813, 45 (2015) [arXiv:1509.00342]

(34) Chao-Wei Tsai, Peter R.M. Eisenhardt, Jingwen Wu et al.; “The Most Lu- minous Galaxies Discovered by WISE”, The Astrophysical Journal, 805, 90 (2015) [arXiv:1410.1751]

(33) R.J. Assef, P.R.M. Eisenhardt, D. Stern, Chao-Wei Tsai et al.; “Half of the Most Luminous Quasars May Be Obscured: Investigating the Nature of WISE- Selected Hot, Dust-Obscured Galaxies”, The Astrophysical Journal, 804, 27 (2015) [arXiv:1408.1092]

(32) Suzy F. Jones, Andrew W. Blain, Carol Lonsdale et al., including Chao- Wei Tsai; “Submillimetre observations of WISE/radio-selected AGN and their environments”, Monthly Notices of the Royal Astronomical Society, 448, p. 3325 (2015) [arXiv:1503.02561]

(31) D. Stern, G. B. Lansbury, R. J. Assef, et al., including Chao-Wei Tsai; “NuSTAR and XMM-Newton Observations of Luminous, Heavily Obscured, WISE- Selected Quasars at z ∼ 2”, The Astrophysical Journal Letter, 794, 102 (2014) [arXiv:1403.3078]

(30) Jingwen Wu, Shane S. Bussmann, Chao-Wei Tsai et al.; “Interferometric Follow-Up of WISE Hyper-Luminous Hot, Dust-Obscured Galaxies”, The Astrophysical Journal, 793, 8 (2014) [arXiv:1405.1147]

(29) Suzy F. Jones, Andrew W. Blain, Daniel Stern et al., including Chao-Wei Tsai; “Submillimetre observations of WISE-selected high-redshift, luminous, dusty galaxies”, Monthly Notices of the Royal Astronomical Society, 443, p. 146 (2014) [arXiv:1406.2506]

(28) Chao-Wei Tsai, Thomas Jarrett, Daniel Stern et al. “WISE J2332-5056: a Double-Peaked Broad-Lined AGN with Spiral-Shaped Radio Morphology”, The Astrophysical Journal, 779, 41 (2013) [arXiv:1310.2257]

(27) Andrew Blain, Roberto Assef, Daniel Stern, Chao-Wei Tsai, et al.; “WISE Detections of Known QSOs at Redshifts Greater than Six”, The Astrophysical Journal, 778, 113 [arXiv:1310.2301]

(26) Chao-Wei Tsai, Jean L. Turner, Sara C. Beck et al. “The Circumnuclea Star Formation Environment of NGC6946: Br-gamma and H2 Results from Keck Integral Field Spectroscopy”, The Astrophysical Journal, 776, 70 (2013) [arXiv:1308.2761]

(25) S. M. Petty, D. Neill, T. H. Jarrett, et al., including Chao-Wei Tsai; “UV- Bright Nearby Early Type Galaxies Observed in the Mid-Infrared: Evidence for a Multi-Stage Formation History by Way of WISE and GALEX Imaging”, The Astronomical Journal, 146, 77 (2013) [arXiv:1307.6282]

(24) D. M. Alexander, D. Stern, A. Del Moro, et al., including Chao-Wei Tsai; “The NuSTAR Extragalactic Survey: A First Sensitive Look at the High-Energy Cosmic X-ray Background Population”, The Astrophysical Journal, 773, 125 (2013) [arXiv:1307.1733]

(23) Roberto Assef, Daniel Stern, Christopher S. Kochanek, et al., including Chao- Wei Tsai; “Mid-Infrared Selection of Active Galactic Nuclei with the Wide-Field Infrared Survey Explorer. II. Properties of WISE-Selected Active Galactic Nu- clei in the NDWFS Bootes Field”, The Astrophysical Journal, 772, 26 (2013) [arXiv:1209.6055]

(22) Carrie R. Bridge, Andrew Blain, Colin J.K. Borys, et al., including Chao-Wei Tsai; “A New Population of High-z, Dusty Ly-α Emitters and Blobs Discovered by WISE: Feedback Caught in the Act?”, The Astrophysical Journal, 769, 91 (2013) [arXiv:1205.4030]

(21) Jarrett, T. H., Masci, F., Chao-Wei Tsai, et al.; “Extending the Nearby Galaxy Heritage with WISE: First Results from the WISE Enhanced Resolution Galaxy Atlas”, The Astronomical Journal, 145, 6 (2013) [arXiv:1210.3628]

(20) Lin Yan, Emilio Donoso, Chao-Wei Tsai, et al.; “Characterizing the Mid- IR Extragalactic Sky with WISE and SDSS”, The Astronomical Journal, 145, 44 (2013) [arXiv:1209.2065]

(19) Griffith, Roger, Kirkpatrick, J. Davy, Eisenhardt, Peter R. M., et al. , includ- ing Chao-Wei Tsai; “Spitzer Photometry of WISE-Selected Brown Dwarf and Hyper-Luminous Infrared Galaxy Candidates”, The Astronomical Journal, 144, 148 (2012) [arXiv:1209.1855]

(18) Jingwen Wu, Chao-Wei Tsai, Jack Sayers, et al.; “Submillimeter Follow-up of WISE-Selected Hyperluminous Galaxies”, The Astrophysical Journal, 756, 96 (2012) [arXiv:1208.5518]

(17) Peter R. M. Eisenhardt., Jingwen Wu, Chao-Wei Tsai, et al.; “The First Hyper-Luminous Infrared Galaxy Discovered by WISE”, The Astrophysical Jour- nal, 755, 173 (2012) [arXiv:1208.5517]

(16) Jarrett, T. H., Masci, F., Chao-Wei Tsai, et al.; “Constructing a WISE High Resolution Galaxy Atlas”, The Astrophysical Journal, 753, 30 (2012) [arXiv: 1208.0362]

(15) Daniel Stern, Roberto J. Assef, Dominic J. Benford, et al., including Chao- Wei Tsai; “WISE Selection of AGN in the COSMOS Field”, The Astrophysical Journal, 753, 30 (2012) [arXiv:1205.0811]

(14) Nicholas A. Bond, Dominic J. Benford, Jonathan P. Gardner, et al. includ- ing Chao-Wei Tsai; “The Infrared Properties of Sources Matched in the WISE All-Sky and Herschel ATLAS Survey”, The Astrophysical Journal Letter, 750, 18 (2012) [arXiv:1204.2020]

(13) Bau-Ching Hsieh, Wei-Hao Wang, Haojing Yan, Lihwai Lin, Hiroshi Karoji, Jeremy Lim, Paul Ho, Chao-Wei Tsai; “The Taiwan ECDFS Near-Infrared Sur- vey: Very Bright End of the Luminosity Function”, The Astrophysical Journal, 749, 88 (2012) [arXiv:1202.1576]

(12) E. Donoso, Lin Yan, Chao-Wei Tsai, P. Eisenhardt, D. Stern, R. J. Assef, D. Leisawitz, T. H. Jarrett, S. A. Stanford “Origin of the 12um Emission Across Galaxy Populations from WISE and SDSS Surveys”, The Astrophysical Journal, 748, 80 (2012) [arXiv:1201.2943]

(11) Sean E. Lake, Edward L. Wright, Sara Petty, Roberto J. Assef, Spencer, A. Stanford, Daniel Stern, Chao-Wei Tsai; “Optical Spectroscopic Survey of High Latitude WISE Selected Sources”, The Astronomical Journal, 143, 7 (2012) [arXiv:1111.0341]

(10) Miju Kang, Minho Choi, John H. Bieging, Jeonghee Rho, Jeong-Eun Lee, and Chao-Wei Tsai; “Submillimeter Observations of Dense Clumps in the In- frared Dark Cloud G049.40–00.01”, The Astrophysical Journal, 743, 198 (2011) [arXiv:1110.3148]

(09) J. Davy Kirkpatrick, Michael C. Cushing, Christopher R. Gelino, et al., in- cluding Chao-Wei Tsai; “The First Hundred Brown Dwarfs Discovered by the Wide-field Infrared Survey Explorer (WISE)”, The Astrophysical Journal Supple- ment, 197, 19 (2011) [arXiv:1108.4677]

(08) Roger L. Griffith, Tsai, Chao-Wei, Daniel Stern, et al.; “WISE Discovery of Low Metallicity Blue Compact Dwarf Galaxies”, The Astrophysical Journal Letter, 736, 22 (2011) [arXiv:1106.4844]

(07) T. H. Jarrett, M. Cohen, F. Masci, et al., including C.-W. Tsai; “The Spitzer-WISE Survey of the Ecliptic Poles”, The Astronomical Journal, 735, 112 (2011)

(06) David S. Meier; Jean L. Turner; Sara C. Beck; Vargoujan Gorjian; Chao-Wei Tsai; & Schuyler D. Van Dyk; “First Views of a Nearby LIRG: Star Formation and Molecular Gas in IRAS 04296+2923”, The Astronomical Journal, 140, p. 1294 (2010) [arXiv:1008.5174]

(05) Edward L. Wright, Peter R. M. Eisenhardt, Amy Mainzer, et al., includingChao-Wei Tsai “The Wide-field Infrared Survey Explorer (WISE): Mission De- scription and Initial On-orbit Performance”, The Astronomical Journal, 140, p. 1868 (2010) [arXiv:1008.0031]

(04) Chao-Wei Tsai; Jean L. Turner; Sara C. Beck; David S. Meier; & Paul T. P. Ho; “Locating the Youngest HII Regions in M82 with 7 mm Continuum Maps”, The Astronomical Journal, 137, p. 4655 (2009) [arXiv:0903.1858]

(03) Chao-Wei Tsai; Jean L. Turner; Sara C. Beck; Lucian P. Crosthwaite; Paul T. P. Ho; & David S. Meier; “Subarcsecend-Resolution Radio Maps of Nearby Spiral Galaxies”, The Astronomical Journal, 132, p. 2383 (2006) [arXiv:astro- ph/0609212]

(02) Chau-Hwang Lee; Jyhpyng Wang; & Chao-Wei Tsai; “Differential Confocal Microscopy”, Instruments Today, 21, no. 5, p. 7 (2000). ISSN 1019-5440, [invited article]

(01) Chao-Wei Tsai, Chau-Hwang Lee, & Jyhpyng Wang; “Deconvolution of local surface response from topography in nanometer profilometry with a dual-scan method”, Optics Letters, 24, p. 1732 (1999) 

Selected Conference Presentations

(1) "The Current Status of the FAST", CHANG-ES International Workshop on CGM Science Frontiers, Nanjing, Chao-Wei Tsai et al., 2019-05

(2) "Identifying Outlier Galaxies Using Multi-Wavelength Databases", The 5th Workshop for Australia-ChinA ConsortiuM for Astrophysical Research, Melbourne, Chao-Wei Tsai 2019-04 [invited]

(3) "Super-Eddington Accretion in the Most Luminous WISE Hot DOGs", East Asia Active Galactic Nucleus Workshop, Taipei, Chao-Wei Tsai, 2019-01

(4) "AGN Feedback in the Host of Hyperluminous Hot DOGs", 2018 TMT Science Forum, Pasadena, Chao-Wei Tsai, 2018-12

(5) "The Hunt for the Most Luminous Galaxies with WISE", Nedfest 2017, Los Angeles, Chao-Wei Tsai, 2017-08 [invited]

(6) "Mid-infrared [Ne II] Imaging of Young Massive Star Clusters Near Galactic Nuclei", IAU 22nd General Assembly, Honolulu, S.C.C. Yeh, Chao-Wei Tsai et al., 2015-08

(7) "Discovery of the Most Luminous Galaxies in the Universe with WISE",  WISE at 5: Legacy and Prospects, Pasadena, Chao-Wei Tsai, 2015-02 [invited]

(8) "WISE Discovery of Very Red Blue Compact Dwarf Galaxies", AAS 219th Meeting, Austin, Chao-Wei Tsai et al., 2012-01

(9) "WISE Discovery of Hyper Luminous Galaxies at z=2-4 and Their Implications for Galaxy and AGN Evolution", Galaxy Mergers in an Evolving Universe, Hualien, Chao-Wei Tsai et al., 2011-10

(10)"Local SFR Indicators in Nearby Galaxies Using WISE Bands", Through the Infrared Looking Glass: A Dusty View of Galaxy and AGN Evolution, Pasadena, Chao-Wei Tsai,   2011-10

(11)"High Resolution Radio Maps of Four Nearby Spiral Galaxies", East Asian Young Astronomers Meeting, Kiyosato, Chao-Wei Tsai et al., 2006-02

(12)"SCUBA observations of Luminous Infrared Galaxies", Conference of``The Physics of Galaxy Formation,'' Tsukuba, C.-Y. Hwang & Chao-Wei Tsai, 2000-07

(13)"Deconvolution of local surface response from surface topography in profilometry by a dual-scan method", Conference on Lasers and Electro-Optics, Baltimore,,  Chao-Wei Tsai et al., 1999-05

(14)"Deconvolution of Local Surface Response from Surface Topography in Optical Prolometry by a Dual-scan Method", International Photonics Conference'98, Taipei, Chao-Wei Tsai et al., 1998-12


California Institute of Technology; University of California, Berkeley; University of California, Los Angeles, University of California, San Diego; University of Leicester; University of Diego Portales; University of Cape Town; Peking University; Nanjing University; Yunnan University; Shanghai Astronomical Observatory; Academia Sinica, Taiwan University; Central University