Results 61 to 70 of about 4,320,326 (297)
The host galaxies and classification of active galactic nuclei [PDF]
, 2006 We present an analysis of the host properties of 85224 emission-line galaxies selected from the Sloan Digital Sky Survey. We show that Seyferts and LINERs form clearly separated branches on the standard optical diagnostic diagrams.
L. Kewley +5 more
semanticscholar +1 more source
, 2001 On 26 May 1999, one of the Sloan Digital Sky Survey (SDSS) fiber-fed spectrographs saw astronomical first light. This was followed by the first spectroscopic commissioning run during the dark period of June 1999.
Adami C. +63 more
core +1 more source
LABOCA observations of nearby, active galaxies [PDF]
, 2008 We present large scale 870 micron maps of the nearby starburst galaxies NGC253, NGC4945 and the nearest giant elliptical radio galaxy Centaurus A (NGC 5128) obtained with the newly commissioned Large Apex Bolometer Camera (LABOCA) operated at the APEX ...
A. Kovács +50 more
core +1 more source
Megamaser Activity in Active Galaxies [PDF]
Symposium - International Astronomical Union, 1999 Megamaser emission provides an unprecedented view of the inner nuclear regions of active galaxies. The characteristics of OH, H2CO, and H2O sources identify different physical environments in the nuclei of megamaser host galaxies. Various classification schemes suggest a dominant starburst nature for the OH and H2CO sources providing the NIR/FIR ...
openaire +2 more sources
The star formation rates of active galactic nuclei host galaxies [PDF]
, 2016 Using artificial neural network (ANN) predictions of total infra-red luminosities (LIR), we compare the host galaxy star formation rates (SFRs) of ~21,000 optically selected active galactic nuclei (AGN), 466 low excitation radio galaxies (LERGs) and 721 ...
S. Ellison +3 more
semanticscholar +1 more source
Dust-obscured Galaxies with Broken Power-law Spectral Energy Distributions Discovered by UNIONS
The Astrophysical JournalWe report on the spectral energy distributions (SEDs) of infrared (IR)-bright dust-obscured galaxies (DOGs) with ( i − [22]) _AB ≥ 7.0. Using photometry from the deep and wide Ultraviolet Near-Infrared Optical Northern Survey, combined with near-IR (NIR)
Taketo Yoshida +13 more
doaj +1 more source
Radio Loud AGNs are Mergers [PDF]
, 2015 We measure the merger fraction of Type 2 radio-loud and radio-quiet active galactic nuclei at z>1 using new samples. The objects have HST images taken with WFC3 in the IR channel.
Chiaberge, Marco +3 more
core +2 more sources
Stellar populations in active galaxies [PDF]
Proceedings of the International Astronomical Union, 2004 To appear in "The Interplay among Black Holes, Stars and ISM in Galactic Nuclei", T. Storchi Bergmann, L.C. Ho & H.R. Schmitt, eds., Proc IAU Symp 222 (Cambridge University Press)
openaire +2 more sources
DO QUIESCENT AND ACTIVE GALAXIES HAVE DIFFERENT MBH–σ* RELATIONS? [PDF]
, 2013 To investigate the validity of the assumption that quiescent galaxies and active galaxies follow the same black hole mass (MBH)–stellar velocity dispersion (σ*) relation, as required for the calibration of MBH estimators for broad line active galactic ...
J. Woo +5 more
semanticscholar +1 more source
Long slit spectroscopy of a sample of isolated spirals with and without an AGN
, 2003 We present the kinematical data obtained for a sample of active (Seyfert) and non active isolated spiral galaxies, based on long slit spectra along several position angles in the Halpha line region and, in some cases, in the Ca triplet region as well ...
Courteau +29 more
core +3 more sources