X
Search Filters
Format Format
Subjects Subjects
Subjects Subjects
X
Sort by Item Count (A-Z)
Filter by Count
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
galaxies: active (21) 21
luminosity (17) 17
quasars: general (16) 16
galaxies (15) 15
astrophysics - cosmology and nongalactic astrophysics (14) 14
physics - cosmology and nongalactic astrophysics (14) 14
digital sky survey (13) 13
x-rays: galaxies (13) 13
astrophysics - astrophysics of galaxies (11) 11
astrophysics - high energy astrophysical phenomena (11) 11
black holes (11) 11
galaxies: seyfert (11) 11
quasars (11) 11
infrared: galaxies (10) 10
surveys (10) 10
astrophysics, cosmology and astronomy (9) 9
catalogs (9) 9
galaxy nuclei (8) 8
physics - astrophysics of galaxies (8) 8
red shift (8) 8
solar and stellar astrophysics (8) 8
emission (7) 7
wide-field survey (7) 7
x-rays: general (7) 7
xmm-newton (7) 7
astronomy (6) 6
physics - high energy astrophysical phenomena (6) 6
physics - instrumentation and methods for astrophysics (6) 6
seyfert-galaxies (6) 6
x radiation (6) 6
x-rays (6) 6
accretion disks (5) 5
cosmos field (5) 5
hard x-ray (5) 5
instrumentation and methods for astrophysics (5) 5
quasars: individual (5) 5
quasars: supermassive black holes (5) 5
seyfert galaxies (5) 5
sky surveys (5) 5
stars (5) 5
supermassive black-holes (5) 5
ultraluminous infrared galaxies (5) 5
black-hole mass (4) 4
data release (4) 4
digital-sky-survey (4) 4
earth and planetary astrophysics (4) 4
galaxies: star formation (4) 4
host galaxies (4) 4
kev range (4) 4
physics - earth and planetary astrophysics (4) 4
physics - solar and stellar astrophysics (4) 4
spectra (4) 4
x-ray (4) 4
x-rays: individual (4) 4
xmm-newton observations (4) 4
astronomy and astrophysics (3) 3
cosmic x-ray sources (3) 3
electromagnetic radiation (3) 3
emission-line (3) 3
forming galaxies (3) 3
galaxies: starburst (3) 3
hard x radiation (3) 3
ionizing radiations (3) 3
magellanic clouds (3) 3
midinfrared selection (3) 3
number counts (3) 3
optical properties (3) 3
photometry (3) 3
physical properties (3) 3
point-source catalog (3) 3
quasars: emission lines (3) 3
radiations (3) 3
space and planetary science (3) 3
spectroscopy (3) 3
spitzer-space-telescope (3) 3
star & galaxy formation (3) 3
star formation (3) 3
stars & galaxies (3) 3
x-ray galaxies (3) 3
xmm (3) 3
1st spectroscopic data (2) 2
absorption (2) 2
active galaxies (2) 2
astrophysics - instrumentation and methods for astrophysics (2) 2
black-hole masses (2) 2
catalogues (2) 2
chandra multiwavelength project (2) 2
cosmic ray sources (2) 2
density (2) 2
diagnostic systems (2) 2
dust (2) 2
dusts (2) 2
emission spectra (2) 2
emissions (2) 2
more...
Language Language
Publication Date Publication Date
Click on a bar to filter by decade
Slide to change publication date range


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
Journal Article
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)
Journal Article
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
Journal Article
The Astrophysical Journal, ISSN 1538-4357, 04/2017, Volume 840, Issue 1, p. 11
Journal Article
The Astrophysical Journal, ISSN 1538-4357, 09/2017, Volume 847, Issue 2, p. 116
Journal Article
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
Journal Article
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
Journal Article
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
Journal Article
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
Journal Article
The Astrophysical Journal, ISSN 0004-637X, 03/2011, Volume 729, Issue 1, p. 52
Journal Article
Astrophysical Journal, ISSN 0004-637X, 08/2015, Volume 808, Issue 2, pp. 1 - 20
Journal Article
Astrophysical Journal Letters, ISSN 2041-8205, 03/2013, Volume 765, Issue 2, pp. 1 - 6
Journal Article
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
Journal Article