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astrophysics (32) 32
astronomy & astrophysics (30) 30
active galactic nuclei (26) 26
cosmology and extragalactic astrophysics (24) 24
galaxy astrophysics (24) 24
high energy astrophysical phenomena (24) 24
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astrophysics - astrophysics of galaxies (11) 11
astrophysics - high energy astrophysical phenomena (11) 11
black holes (11) 11
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surveys (10) 10
astrophysics, cosmology and astronomy (9) 9
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seyfert galaxies (5) 5
sky surveys (5) 5
stars (5) 5
supermassive black-holes (5) 5
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earth and planetary astrophysics (4) 4
galaxies: star formation (4) 4
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physics - earth and planetary astrophysics (4) 4
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astrophysics - instrumentation and methods for astrophysics (2) 2
black-hole masses (2) 2
catalogues (2) 2
chandra multiwavelength project (2) 2
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density (2) 2
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1. Full Text A black hole changes its feeding habits
by LaMassa, Stephanie
Nature, ISSN 0028-0836, 12/2016, Volume 540, Issue 7631, pp. 48 - 49
These growing black holes, or active galactic nuclei (AGNs), release large amounts of energy from the accretion process, making them visible across the... 
Black holes | Spectrum analysis | Light | Astronomy
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2. Full Text Astronomy: A black hole changes its feeding habits
by Lamassa, Stephanie
Nature, ISSN 0028-0836, 12/2016, Volume 540, Issue 7631, pp. 48 - 49
In the 1980s, the gas surrounding a black hole in a nearby galaxy began to emit much more radiation than before. This change has unexpectedly reversed in the... 
LOOK QUASARS | VARIABILITY | ACTIVE GALACTIC NUCLEI | REFERENCE SURVEY CARS | SHADOWS | SEARCH | MULTIDISCIPLINARY SCIENCES | SDSS | SEYFERT 1 | Observations | Black holes (Astronomy)
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3. Full Text The sloan digital sky survey quasar catalog: Fourteenth data release
by Pâris, Isabelle and Petitjean, Patrick and Aubourg, Éric and Myers, Adam D and Streblyanska, Alina and Lyke, Brad W and Anderson, Scott F and Armengaud, Éric and Bautista, Julian and Blanton, Michael R and Blomqvist, Michael and Brinkmann, Jonathan and Brownstein, Joel R and Brandt, William Nielsen and Burtin, Étienne and Dawson, Kyle and De La Torre, Sylvain and Georgakakis, Antonis and Gil-Marín, Héctor and Green, Paul J and Hall, Patrick B and Kneib, Jean-Paul and LaMassa, Stephanie M and Le Goff, Jean-Marc and MacLeod, Chelsea and Mariappan, Vivek and McGreer, Ian D and Merloni, Andrea and Noterdaeme, Pasquier and Palanque-Delabrouille, Nathalie and Percival, Will J and Ross, Ashley J and Rossi, Graziano and Schneider, Donald P and Seo, Hee-Jong and Tojeiro, Rita and Weaver, Benjamin A and Weijmans, Anne-Marie and Yèche, Christophe and Zarrouk, Pauline and Zhao, Gong-Bo
Astronomy and Astrophysics, ISSN 0004-6361, 2018, Volume 613, p. A51
We present the data release 14 Quasar catalog (DR14Q) from the extended Baryon Oscillation Spectroscopic Survey (eBOSS) of the Sloan Digital Sky Survey IV... 
Surveys | Catalogs | Quasars: general | CALIBRATION | quasars: general | TELESCOPE | BROAD ABSORPTION-LINE | surveys | DISCOVERY | EVOLUTION | EXTREMELY RED QUASARS | catalogs | ASTRONOMY & ASTROPHYSICS | SDSS | GALAXIES | SELECTION | Quasars | Red shift | Inspection | Sky surveys (astronomy) | Spectra | Contamination | Emissions | Near infrared radiation | Radio emission | Absorption | Spectral resolution | Cosmology | Photometry
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4. Full Text Insight into “Changing-look” AGN Mrk 1018 from the Fe KαLine: The Reprocessing Gas Has Yet to Fully Respond to the Fading of the AGN
by LaMassa, Stephanie M and Yaqoob, Tahir and Kilgard, Roy
The Astrophysical Journal, ISSN 1538-4357, 04/2017, Volume 840, Issue 1, p. 11
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5. Full Text Peering Through the Dust. II.XMM-NewtonObservations of Two Additional FIRST-2MASS Red Quasars
by Glikman, Eilat and LaMassa, Stephanie and Piconcelli, Enrico and Urry, Meg and Lacy, Mark
The Astrophysical Journal, ISSN 1538-4357, 09/2017, Volume 847, Issue 2, p. 116
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6. Full Text Insight into "changing-look" AGN Mrk 1018 from the Fe Kα Line: The Reprocessing Gas Has Yet to Fully Respond to the Fading of the AGN
by Lamassa, Stephanie M and Yaqoob, Tahir and Kilgard, Roy
Astrophysical Journal, ISSN 0004-637X, 05/2017, Volume 840, Issue 1
Mrk 1018 is a "changing-look" active galactic nucleus (AGN) whose optical spectrum transitioned from a Type 1.9 to a Type 1 between 1979 and 1984, and then... 
X-rays: individual (Mrk 1018) | galaxies: Seyfert | REFERENCE SURVEY CARS | TYPE-2 SEYFERT-GALAXIES | EMISSION-LINE | ASCA OBSERVATIONS | VARIABILITY | REFLECTION | QUASARS | ACTIVE GALACTIC NUCLEI | ASTRONOMY & ASTROPHYSICS | X-RAY | SPECTRUM
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7. Full Text The discovery of the first "changing look" Quasar: New insights into the physics and phenomenology of active galactic nuclei
by Lamassa, Stephanie M and Cales, Sabrina and Moran, Edward C and Myers, Adam D and Richards, Gordon T and Eracleous, Michael and Heckman, Timothy M and Gallo, Luigi and Urry, C. Megan
Astrophysical Journal, ISSN 0004-637X, 02/2015, Volume 800, Issue 2
SDSS J015957.64+003310.5 is an X-ray selected, z = 0.31 active galactic nucleus (AGN) from the Stripe 82X survey that transitioned from a Type 1 quasar to a... 
quasars: individual (SDSS J015957.64+003310.5) | quasars: emission lines | quasars: general | quasars: supermassive black holes | accretion, accretion disks | line: profiles | NARROW-LINE REGION | HOST-GALAXY STARLIGHT | SEYFERT-GALAXIES | BLACK-HOLE MASSES | VELOCITY-DELAY MAPS | REVERBERATION MEASUREMENTS | RADIUS-LUMINOSITY RELATIONSHIP | accretion | DIGITAL SKY SURVEY | ASTRONOMY & ASTROPHYSICS | STELLAR OBJECTS | DATA RELEASE | accretion disks
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8. Full Text Peering Through the Dust. II. XMM-Newton Observations of Two Additional FIRST-2MASS Red Quasars
by Glikman, Eilat and Lamassa, Stephanie and Piconcelli, Enrico and Urry, Meg and Lacy, Mark
Astrophysical Journal, ISSN 0004-637X, 10/2017, Volume 847, Issue 2
We obtained XMM-Newton observations of two highly luminous dust-reddened quasars, F2M1113+1244 and F2M1656+3821, that appear to be in the early, transitional... 
X-rays: individual (F2M1113+1244, F2M1656+3821) | infrared: galaxies | galaxies: active | quasars: individual (F2M1113+1244, F2M1656+3821) | PHOTON IMAGING CAMERA | REDDENED QUASARS | RADIO PROPERTIES | ACTIVE GALACTIC NUCLEI | BLACK-HOLE MASS | DIGITAL SKY SURVEY | ASTRONOMY & ASTROPHYSICS | 1ST SURVEY | RATE INDICATOR | BULGE MASS | X-RAY-SPECTRUM
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9. Full Text PEERING THROUGH the DUST: NuSTAR OBSERVATIONS of TWO FIRST-2MASS RED QUASARS
by Lamassa, Stephanie M and Ricarte, Angelo and Glikman, Eilat and Urry, C. Megan and Stern, Daniel and Yaqoob, Tahir and Lansbury, George B and Civano, Francesca and Boggs, Steve E and Brandt, W.N and Chen, Chien-Ting J and Christensen, Finn E and Craig, William W and Hailey, Chuck J and Harrison, Fiona and Hickox, Ryan C and Koss, Michael and Ricci, Claudio and Treister, Ezequiel and Zhang, Will
Astrophysical Journal, ISSN 0004-637X, 03/2016, Volume 820, Issue 1, pp. 70 - 70
Some reddened quasars appear to be transitional objects in the paradigm of merger-induced black hole growth/galaxy evolution, where a heavily obscured nucleus... 
infrared: galaxies | galaxies: active | Xrays: individual (F2M 0830+3759, F2M 1227+3214) | quasars: individual (F2M 0380+3759, F2M 1227+3214) | WIDE-FIELD SURVEY | SEYFERT-GALAXIES | REDDENED QUASARS | SUPERMASSIVE BLACK-HOLES | ACTIVE GALACTIC NUCLEI | COSMOS FIELD | DIGITAL SKY SURVEY | ASTRONOMY & ASTROPHYSICS | X-RAY | X-rays: individual (F2M 0830+3759, F2M 1227+3214) | XMM-NEWTON OBSERVATIONS | RAY SPECTRAL MODEL | Quasars | Active galactic nuclei | Dust | X rays | Cosmic dust | Luminosity | Mathematical models | XMM (spacecraft)
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10. Full Text Now you see it, now you don't: the disappearing central engine of the quasar J1011+5442
by Runnoe, JC and Cales, S and Ruan, JJ and Eracleous, M and Anderson, SF and Shen, Y and Green, PJ and Morganson, E and LaMassa, S and Greene, JE and Dwelly, T and Schneider, DP and Merloni, A and Georgakakis, A and Roman-Lopes, A
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, ISSN 0035-8711, 01/2016, Volume 455, Issue 2, pp. 1691 - 1701
We report the discovery of a new 'changing-look' quasar, SDSS J101152.98+544206.4, through repeat spectroscopy from the Time Domain Spectroscopic Survey. This... 
quasars: general | SEYFERT-GALAXIES | HOST GALAXIES | BLACK-HOLE MASSES | LIGHT CURVES | accretion, accretion discs | ACTIVE GALACTIC NUCLEI | TIDAL DISRUPTION EVENTS | galaxies: active | DIGITAL SKY SURVEY | ASTRONOMY & ASTROPHYSICS | BROAD-LINE EMISSION | DATA RELEASE | SPECTROSCOPIC SURVEY
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11. Full Text Optical versus infrared studies of dusty galaxies and active galactic nuclei - I. Nebular emission lines
by Wild, Vivienne and Groves, Brent and Heckman, Timothy and Sonnentrucker, Paule and Armus, Lee and Schiminovich, David and Johnson, Benjamin and Martins, Lucimara and LaMassa, Stephanie
Monthly Notices of the Royal Astronomical Society, ISSN 0035-8711, 2011, Volume 410, Issue 3, pp. 1593 - 1610
Optical nebular emission lines are commonly used to estimate the star formation rate of galaxies and the black hole accretion rate of their central active... 
galaxies: ISM | dust, extinction | galaxies: star formation | Galaxies: star formation | Galaxies: ISM | Dust, extinction | STAR-FORMING GALAXIES | SEYFERT-GALAXIES | SUPERMASSIVE BLACK-HOLES | extinction | STARBURST GALAXIES | DIGITAL SKY SURVEY | ASTRONOMY & ASTROPHYSICS | OBSERVATIONAL CONSTRAINTS | ULTRAVIOLET EXTINCTION | SPITZER-SPACE-TELESCOPE | dust | STELLAR POPULATION SYNTHESIS | FORMATION HISTORIES | Galaxies | Astronomy | Silicates | Nebulae | Star & galaxy formation | Stars & galaxies | Emissions
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12. Full Text Exploring the connection between star formation and active galactic nucleus activity in the local universe
by Lamassa, Stephanie M and Heckman, T.M and Ptak, A and Schiminovich, D and O'Dowd, M and Bertincourt, B
Astrophysical Journal, ISSN 0004-637X, 10/2012, Volume 758, Issue 1, pp. 1 - 27
We study a combined sample of 264 star-forming, 51 composite, and 73 active galaxies using optical spectra from the Sloan Digital Sky Survey (SDSS) and... 
STATISTICAL-METHODS | galaxies: Seyfert | infrared: galaxies | VELOCITY DISPERSION | SEYFERT-GALAXIES | POLYCYCLIC AROMATIC-HYDROCARBONS | galaxies: star formation | ASTRONOMICAL DATA | FORMING GALAXIES | galaxies: active | techniques: spectroscopic | BLACK-HOLE MASS | ASTRONOMY & ASTROPHYSICS | SPITZER-SPACE-TELESCOPE | STARBURST-AGN CONNECTION | ULTRALUMINOUS INFRARED GALAXIES | Active galactic nuclei | Polyallylamine hydrochloride | Star formation | Galaxies | Sky surveys (astronomy) | Spectra | Diagnostic systems | Fluxes | LUMINOSITY | NEON IONS | DUSTS | INTERMEDIATE INFRARED RADIATION | PHOTON EMISSION | ASTROPHYSICS, COSMOLOGY AND ASTRONOMY | ASTRONOMY | STAR EVOLUTION | ASTROPHYSICS | INFRARED SPECTRA | STARS | SEYFERT GALAXIES | POLYCYCLIC AROMATIC HYDROCARBONS | UNIVERSE | VISIBLE SPECTRA | GALAXY NUCLEI
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13. Full Text SDSS-IV eBOSS Spectroscopy of X-Ray and WISE AGNs in Stripe 82X: Overview of the Demographics of X-Ray- and Mid-infrared-selected Active Galactic Nuclei
by Lamassa, Stephanie M and Georgakakis, Antonis and Vivek, M and Salvato, Mara and Ananna, Tonima Tasnim and Urry, C. Meg and Macleod, Chelsea and Ross, Nicholas
Astrophysical Journal, ISSN 0004-637X, 05/2019, Volume 876, Issue 1, p. 50
We report the results of a Sloan Digital Sky Survey IV eBOSS program to target X-ray sources and mid-infraredselected Wide-field Infrared Survey Explorer... 
surveys | galaxies: active | catalogs | WIDE-FIELD SURVEY | IDENTIFICATION | SAMPLE | COSMOS FIELD | DIGITAL SKY SURVEY | ASTRONOMY & ASTROPHYSICS | GALAXIES | EMISSION | MULTIWAVELENGTH PROPERTIES | MIDINFRARED PROPERTIES | XMM-NEWTON
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14. Full Text Uncovering Obscured Active Galactic Nuclei in Homogeneously Selected Samples of Seyfert 2 Galaxies
by LaMassa, Stephanie M and Heckman, T. M and Ptak, A and Martins, L and Wild, V and Sonnentrucker, P and Hornschemeier, A
The Astrophysical Journal, ISSN 0004-637X, 03/2011, Volume 729, Issue 1, p. 52
We have analyzed archival Chandra and XMM-Newton data for two nearly complete homogeneously selected samples of type 2 Seyfert galaxies (Sy2s). These samples... 
galaxies | galaxies X-rays | Seyfert infrared | active galaxies | STATISTICAL-METHODS | galaxies: Seyfert | infrared: galaxies | X-rays: galaxies | COMPTON-THICK | EMISSION-LINE | LUMINOSITY FUNCTIONS | galaxies: active | DIGITAL SKY SURVEY | BLACK-HOLE MASS | ASTRONOMY & ASTROPHYSICS | HARD X-RAY | XMM-NEWTON OBSERVATIONS | ULTRALUMINOUS INFRARED GALAXIES | CHANDRA OBSERVATIONS | Physics - Cosmology and Nongalactic Astrophysics
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15. Full Text THE NuSTAR EXTRAGALACTIC SURVEYS: OVERVIEW and CATALOG from the COSMOS FIELD
by Civano, F and Hickox, R.C and Puccetti, S and Comastri, A and Mullaney, J.R and Zappacosta, L and LaMassa, S.M and Aird, J and Alexander, D.M and Ballantyne, D.R and Bauer, F.E and Brandt, W.N and Boggs, S.E and Christensen, F.E and Craig, W.W and Del-Moro, A and Elvis, M and Forster, K and Gandhi, P and Grefenstette, B.W and Hailey, C.J and Harrison, F.A and Lansbury, G.B and Luo, B and Madsen, K and Saez, C and Stern, D and Treister, E and Urry, M.C and Wik, D.R and Zhang, W
Astrophysical Journal, ISSN 0004-637X, 08/2015, Volume 808, Issue 2, pp. 1 - 20
To provide the census of the sources contributing to the X-ray background peak above 10 keV, Nuclear Spectroscopic Telescope Array (NuSTAR) is performing... 
galaxies: nuclei | X-rays: general | HELLAS2XMM SURVEY | SWIFT-BAT SURVEY | MEDIUM-SENSITIVITY SURVEY | ALL-SKY SURVEY | POINT-SOURCE CATALOG | X-RAY LUMINOSITY | ACTIVE GALACTIC NUCLEI | ASTRONOMY & ASTROPHYSICS | CHANDRA DEEP SURVEY | XMM-NEWTON | COMPTON-THICK AGN | Bands | X-rays | X-ray sources | Luminosity | XMM (spacecraft) | Hardness | Cosmos | Density | Physics - High Energy Astrophysical Phenomena
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16. Full Text On the star formation-AGN connection at z ≲ 0.3
by Lamassa, Stephanie M and Heckman, T.M and Ptak, A and Urry, C. Megan
Astrophysical Journal Letters, ISSN 2041-8205, 03/2013, Volume 765, Issue 2, pp. 1 - 6
Using the spectra of a sample of ~28,000 nearby obscured active galaxies from Data Release 7 of the Sloan Digital Sky Survey (SDSS), we probe the connection... 
galaxies: active | galaxies: Seyfert | galaxies: star formation | Active galaxies | Active galactic nuclei | Red shift | Star formation | Apertures | Luminosity | Sky surveys (astronomy) | Accretion disks | Joints | LUMINOSITY | RED SHIFT | APERTURES | CATALOGS | COVERINGS | SPATIAL DISTRIBUTION | BLACK HOLES | ASTROPHYSICS, COSMOLOGY AND ASTRONOMY | ANGULAR MOMENTUM TRANSFER | AVAILABILITY | STARS | SEYFERT GALAXIES | SPECTRA | EFFICIENCY
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17. Full Text TOWARD AN UNDERSTANDING of CHANGING-LOOK QUASARS: AN ARCHIVAL SPECTROSCOPIC SEARCH in SDSS
by Ruan, John J and Anderson, Scott F and Cales, Sabrina L and Eracleous, Michael and Green, Paul J and Morganson, Eric and Runnoe, Jessie C and Shen, Yue and Wilkinson, Tessa D and Blanton, Michael R and Dwelly, Tom and Georgakakis, Antonis and Greene, Jenny E and Lamassa, Stephanie M and Merloni, Andrea and Schneider, Donald P
Astrophysical Journal, ISSN 0004-637X, 08/2016, Volume 826, Issue 2, p. 188
The uncertain origin of the recently discovered "changing-look" quasar phenomenon-in which a luminous quasar dims significantly to a quiescent state in repeat... 
galaxies: active | quasars: emission lines | quasars: general | SPECTRAL CLASSIFICATION | HOST GALAXIES | HANNYS VOORWERP | ACCRETION DISKS | SUPERMASSIVE BLACK-HOLES | TIDAL DISRUPTION EVENT | ACTIVE GALACTIC NUCLEI | OPTICAL-SPECTRA | ASTRONOMY & ASTROPHYSICS | DIGITAL-SKY-SURVEY | EMISSION-LINE PROPERTIES
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18. Full Text THE 31 DEG2 RELEASE of the STRIPE 82 X-RAY SURVEY: The POINT SOURCE CATALOG
by Lamassa, Stephanie M and Urry, C. Megan and Cappelluti, Nico and Böhringer, Hans and Comastri, Andrea and Glikman, Eilat and Richards, Gordon and Ananna, Tonima and Brusa, Marcella and Cardamone, Carie and Chon, Gayoung and Civano, Francesca and Farrah, Duncan and Gilfanov, Marat and Green, Paul and Komossa, S and Lira, Paulina and Makler, Martin and Marchesi, Stefano and Pecoraro, Robert and Ranalli, Piero and Salvato, Mara and Schawinski, Kevin and Stern, Daniel and Treister, Ezequiel and Viero, Marco
Astrophysical Journal, ISSN 0004-637X, 02/2016, Volume 817, Issue 2
surveys | quasars: general | X-rays: general | galaxies: active | catalogs
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19. Full Text Indicators of Intrinsic Active Galactic Nucleus Luminosity: A Multi-wavelength Approach
by LaMassa, Stephanie M and Heckman, Tim M and Ptak, Andrew and Martins, Lucimara and Wild, Vivienne and Sonnentrucker, Paule
The Astrophysical Journal, ISSN 0004-637X, 09/2010, Volume 720, Issue 1, pp. 786 - 810
Active galactic nuclei (AGNs) consist of an accretion disk around a supermassive black hole which in turn is surrounded by an obscuring torus of dust and gas.... 
Galaxies: Seyfert | Infrared: galaxies | galaxies: Seyfert | infrared: galaxies | INFRARED-SELECTED SAMPLE | STAR-FORMING GALAXIES | POLYCYCLIC AROMATIC-HYDROCARBONS | HIGH-RESOLUTION SPECTROSCOPY | SEYFERT 2 GALAXIES | MU-M SAMPLE | SPECTRAL ENERGY-DISTRIBUTIONS | ASTRONOMY & ASTROPHYSICS | HARD X-RAY | OPTICAL SPECTROSCOPY | SPITZER-SPACE-TELESCOPE | LUMINOSITY | RED SHIFT | X RADIATION | HYDROCARBONS | HARD X RADIATION | ORGANIC COMPOUNDS | ACCRETION DISKS | BLACK HOLES | IONIZING RADIATIONS | ASTROPHYSICS, COSMOLOGY AND ASTRONOMY | PHYSICAL PROPERTIES | ELECTROMAGNETIC RADIATION | OPTICAL PROPERTIES | RADIATIONS | STARS | AROMATICS | SEYFERT GALAXIES | GALAXIES | POLYCYCLIC AROMATIC HYDROCARBONS | GALAXY NUCLEI
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