Zobrazeno 1 - 10
of 85
pro vyhledávání: '"Beverley J. Wills"'
Autor:
Donald P. Schneider, Michael A. Strauss, Sarah C. Gallagher, Richard F. Green, Jessie C. Runnoe, G. Ferrero, Paulina Lira, Yue Shen, Richard M. Plotkin, Ohad Shemmer, Brandon Matthews, Gordon T. Richards, W. N. Brandt, Ileana Andruchow, Michael S. Brotherton, Cooper Dix, Adam D. Myers, Beverley J. Wills
Publikováno v:
CONICET Digital (CONICET)
Consejo Nacional de Investigaciones Científicas y Técnicas
instacron:CONICET
Physics and Astronomy Publications
Consejo Nacional de Investigaciones Científicas y Técnicas
instacron:CONICET
Physics and Astronomy Publications
We present spectroscopic measurements for 226 sources from the Gemini Near Infrared Spectrograph - Distant Quasar Survey (GNIRS-DQS). Being the largest uniform, homogeneous survey of its kind, it represents a flux-limited sample (mi . 19.0 mag, H . 1
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ce307e441a54aa91125447db2e749b35
https://iopscience.iop.org/article/10.3847/1538-4365/abc705
https://iopscience.iop.org/article/10.3847/1538-4365/abc705
Autor:
Carlos De Breuck, Jaya Maithil, Michael A. DiPompeo, Beverley J. Wills, John F. C. Wardle, Jessie C. Runnoe, Michael S. Brotherton
Radio core dominance measurements, an indicator of jet orientation, sometimes rely on core flux density measurements from large-area surveys like Faint Images of the Radio Sky at Twenty cm (FIRST) that have an angular resolution of only 5''. Such low
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::cf558c746598730399aeb28f06db6a13
Publikováno v:
The Astrophysical Journal. 706:995-1007
We present the results of a spectral principal component analysis on 9046 broad-line AGN from the Sloan Digital Sky Survey. We examine correlations between spectral regions within various eigenspectra (e.g., between Fe II strength and H$\beta$ width)
Publikováno v:
The Astronomical Journal. 134:294-313
We have obtained quasi-simultaneous ultraviolet-optical spectra for 22 out of 23 quasars in the complete PG-X-ray sample with redshift, z
Autor:
Donald P. Schneider, Brendan P. Miller, Sarah C. Gallagher, Beverley J. Wills, Gordon P. Garmire, W. N. Brandt, Ari Laor
Publikováno v:
The Astrophysical Journal. 652:163-176
We investigate the X-ray properties of PG 1004+130, a low-redshift radio-loud broad absorption line (BAL) quasar with a hybrid FR I/FR II radio morphology. The 22.2 ks XMM-Newton and 41.6 ks Chandra observations presented here are the first X-ray det
Autor:
Zhaohui Shang, Beverley J. Wills
Publikováno v:
Advances in Space Research. 34:2584-2587
The evolution of luminous QSOs is linked to the evolution of massive galaxies. We know this because the relic black-holes found locally have masses dependent on the properties of the host galaxy’s bulge. An important way to explore this evolution w
Publikováno v:
Advances in Space Research. 34:2579-2583
We have performed a spectral principal component analysis for a complete sample of 22 low redshift QSOs with spectra from Lyα to Hα, and found three significant principal components, which account for ∼78% of the spectrum-to-spectrum variance. We
Publikováno v:
Advances in Space Research. 34:2566-2570
We present preliminary results from analyses of hard X-ray and optical observations of a soft X-ray selected sample. We created a small but complete sample with 20 of the softest and brightest objects with low Galactic absorption from the ROSAT brigh
Autor:
Michael Juntao Yuan, Beverley J. Wills
Publikováno v:
Advances in Space Research. 34:2599-2603
Changes in Eddington accretion ratios are thought to result in X-ray spectral index changes in Galactic binary black hole systems. Objects with higher Eddington ratios have softer X-ray spectra. Can we apply this result to much more massive black hol
Autor:
Ari Laor, Juntao Yuan, Derek Wills, Zhaohui Shang, Bingrong Xie, Beverley J. Wills, Edward L. Robinson
Publikováno v:
The Astrophysical Journal. 586:52-71
A unique set of UV-optical spectrograms of 22 low redshift QSOs are investigated using principal component analysis. We find three significant principal components over the broad wavelength range from Ly\alpha to H\alpha. They together account for ab