João Evangelista Steiner, Brazilian astrophysicist (São Martinho, Santa Catarina State 01 March 1950 – São Martinho, Santa Catarina State 10 September 2020)

From German descent

His mother, Alzira Boeing, was a relative to brothers Wilhelm (that founded Boeing) and Werner Boeing

ASTROPHYSICS

Discovered 20 quasars and the pulsar HD7758 Vela X-1 (1977)

With J.E. Grindlay, W.R. Forman, J. McClintock & C.R. Canizares. Discovery of low redshift x-ray quasars: a possible new key to the QSO phenomenon. Bull. Amer. Astron. Soc. 12:777, 1979

With T. Chebowski & J. Halpern. Discovery of a cataclysmic variable near Sirius (1980)

With M.G. Watson, I.M. McHardy, J.P. Pye, F.J. Jablonski & I.C. Busko. A new x-ray cataclysmic variable. Bull. Amer. Astron. Soc. 12:885, 1980

With T. Chebowski & J.P. Halpern. Discovery of a new x-ray emitting dwarf nova. Bull. Amer. Astron. Soc. 12:885, 1980  

With J. Stocke, J. Liebert, T. Maccacaro & R.E. Griffiths. Discovery of a narrow line quasar. Astrophys. J. 252:69-74, 1982

With J.E. Grindlay & T. Maccacaro. Discovery of two active galactic nuclei in clusters of galaxies. Astrophys. J. 259:482-5, 1982

With Francisco Jablonski discovered a dwarf star (VY) that describes a circular path around another star in only 97 minutes (1984)

With M. Garcia, J. Patterson, D.A. Schwartz, R.S. Warwick, M.G. Watson & J.E. McClintock. Identification of two hard x-ray emitting Be stars using the HEAO-1 Scanning Modulation Collimator. Astrophys. J. 280:688-94, 1984

With F.J. Jablonski. NSV12615: an eclipsing cataclysmic variable with ultrashort period. Astrophys. J. 313(1):376, 1987

With D. Cieslinski, F.J. Jablonski & G.R. Hickel. BY Apodis: a new Mira variable. Inform. Bull. Variable Stars 4528:1, 1997

With R.B. Menezes & T.V. Ricci. Discovery of an Hα emitting disk around the supermassive black hole of M31. Astrophys. J. Lett. 762:L29, 2013

Identified narrow lines of Seyfert galaxies as quasars

With N.P. Carleton. Correlations between infrared, optical, x-ray fluxes from Seyfert galaxies and quasars. Bull. Amer. Astron. Soc. 13:520, 1981

Proposed that LINERS galaxies display active nuclei and consequently that most galaxies have a black hole in its core (com J.P. Halperin)

With J. P. Halpern. Low ionization active galactic nuclei: x-ray or shock heated? Astrophys. J. 269:37-41, 1983

Proposed the theory of LINERS explaining such common objects as mini-quasars

Proposed the existence of a new class of stars called V Sagittae Stars and explained their luminosity as due to hydrostatic nuclear reactions on the surface of accreting white dwarfs

With M.P. Díaz. The V Sagittae stars. Publ. Astron. Soc. Pacific 110 (745):276-82, 1998 

First to observe the sudden death phenomenon of binary stars

With A.S. Oliveira, D. Cieslinski & T.V. Ricci. Assisted stellar suicide in V617 Sgr. Astron. Astrophys. 447(2):1-4, 2006

Showed the mechanism of formation of ionized gas winds in black holes

With D. May. A two-stage outflow in NGC 1068. Monthly Notices of the Royal Astronomical Society 469(1), 2017

Proposed an universal outflow mechanism by black holes

With D. May, R.B. Menezes, D.R.A. Williams & J. Wang. The nuclear architecture of NGC4151: on the path toward a universal outflow in light of NGC1068. Mont. Notices Roy. Astron. Soc. 496(2):1488-1516,2020 

METHODS

A spectrophotometric classification of low-redshift quasars and active galactic nuclei. Astrophys. J. 250:469-77, 1981

With R. Baptista. Improving the eclipse mapping method. Astron. Astrophys. 277:331, 1993

With R.B. Menezes, T.V. Ricci & A.S. Oliveira. Mapping low and high density clouds in astrophysical nebulae by imaging forbidden line emission. Monthly Notices of the Royal Astronomical Society 396(2), 2009

With R.B. Menezes, T.V. Ricci & A.S. Oliveira. PCA tomography: how to extract information from data cubes. Monthly Notices of the Royal Astronomical Society 395(1):64-75, 2009

With R.B. Menezes & T.V. Ricci. A treatment procedure for Gemini North/NIFS data cubes: application to NGC4151.  Monthly Notices of the Royal Astronomical Society 438:2597-20, 2014

With R.B. Menezes, P. da Silva & T.V. Ricci. A treatment procedure for VLT/SINFONI data cubes: application to NGC5643.  Monthly Notices of the Royal Astronomical Society 450:369-96, 2015

With R.B. Menezes, T.V. Ricci & P. da Silva. A treatment procedure for GMOS/IFU data cubes: application to NGC2835.  Monthly Notices of the Royal Astronomical Society (2019)

Adapted and improved the analysis of main components to analyze the immense amount of data generated by integral field spectroscopy (2009)

Developed differential photometry technique for viewing cataclysmic variable stars (1990s)

Developed data cube analysis method with three-dimension informations