Search Publications
Refining the Associations of the Fermi Large Area Telescope Source Catalogs
Smith, Howard A.; Masetti, N.; Jiménez-Bailón, E. +10 more
The Fermi-Large Area Telescope (LAT) First Source Catalog (1FGL) was released in 2010 February and the Fermi-LAT 2-Year Source Catalog (2FGL) appeared in 2012 April, based on data from 24 months of operation. Since they were released, many follow up observations of unidentified γ-ray sources have been performed and new procedures for associating γ…
Multiple Stellar Populations of Globular Clusters from Homogeneous Ca by Photometry. I. M22 (NGC 6656)
Lee, Jae-Woo
We investigate the multiple stellar populations in one of the peculiar globular clusters (GCs), M22, using new ground-based wide-field Ca by and Hubble Space Telescope Wide-Field Camera 3 photometry with equivalent passbands, confirming our previous result that M22 has a distinctive red giant branch (RGB) split mainly due to the difference in meta…
Herschel Survey of the Palomar-Green QSOs at Low Redshift
Ho, Luis C.; Scoville, Nicholas Z.; Petric, Andreea O. +1 more
We investigate the global cold dust properties of 85 nearby (z≤slant 0.5) QSOs, chosen from the Palomar-Green sample of optically luminous quasars. We determine their infrared spectral energy distributions and estimate their rest-frame luminosities by combining Herschel data from 70 to 500 µm with near-infrared and mid-infrared measurements …
A Comprehensive Study of Broad Absorption Line Quasars. I. Prevalence of HeI* Absorption Line Multiplets in Low-ionization Objects
Yuan, Weimin; Shu, Xinwen; Zhou, Hongyan +13 more
Neutral helium multiplets, He i* λ λ 3189,3889,10830, are very useful diagnostics for the geometry and physical conditions of the absorbing gas in quasars. So far only a handful of He i* detections have been reported. Using a newly developed method, we detected the He i*λ 3889 absorption line in 101 sources of a well-defined sample of 285 Mg ii br…
An Atlas of Coronal Electron Density at 5R⊙. I. Data Processing and Calibration
Morgan, Huw
Tomography of the solar corona can provide cruicial constraints for models of the low corona, unique information on changes in coronal structure and rotation rates, and a valuable boundary condition for models of the heliospheric solar wind. This is the first of a series of three papers which aim to create a set of maps of the coronal density over…
A New Reduction of the Blanco Cosmology Survey: An Optically Selected Galaxy Cluster Catalog and a Public Release of Optical Data Products
Gladders, M. D.; Rest, A.; Bleem, L. E. +5 more
The Blanco Cosmology Survey is a four-band (griz) optical-imaging survey of ~80 deg2 of the southern sky. The survey consists of two fields centered approximately at (R.A., decl.) = (23h, -55°) and (5h30m, -53°) with imaging sufficient for the detection of L sstarf galaxies at redshift z <=…
The AKARI 2.5-5.0 µm Spectral Atlas of Type-1 Active Galactic Nuclei: Black Hole Mass Estimator, Line Ratio, and Hot Dust Temperature
Nakagawa, Takao; Oyabu, Shinki; Ohyama, Youichi +11 more
We present 2.5-5.0 µm spectra of 83 nearby (0.002 < z < 0.48) and bright (K < 14 mag) type-1 active galactic nuclei (AGNs) taken with the Infrared Camera on board AKARI. The 2.5-5.0 µm spectral region contains emission lines such as Brβ (2.63 µm), Brα (4.05 µm), and polycyclic aromatic hydrocarbons (3.3 µm), …
Integral Field Spectroscopy of AGN Absorption Outflows: Mrk 509 and IRAS F04250-5718
Rupke, David S. N.; Arav, Nahum; Liu, Guilin
Ultraviolet (UV) absorption lines provide abundant spectroscopic information enabling the probe of the physical conditions in active galactic nucleus (AGN) outflows, but the outflow radii (and the energetics consequently) can only be determined indirectly. We present the first direct test of these determinations using integral field unit (IFU) spe…
A Herschel Study of 24 µµm-Selected AGNs and Their Host Galaxies
Smith, G. P.; Egami, E.; Rieke, G. H. +3 more
We present a sample of 290 24 µm-selected active galactic nuclei (AGNs) mostly at z ∼ 0.3-2.5, within 5.2 {{deg}}2 distributed as 25\prime × 25\prime fields around each of 30 galaxy clusters in the Local Cluster Substructure Survey. The sample is nearly complete to 1 mJy at 24 µm, and has a rich multiwavelength set of ancill…
New Fe I Level Energies and Line Identifications from Stellar Spectra
Peterson, Ruth C.; Kurucz, Robert L.
The spectrum of the Fe I atom is critical to many areas of astrophysics and beyond. Measurements of the energies of its high-lying levels remain woefully incomplete, however, despite extensive laboratory and solar analysis. In this work, we use high-resolution archival absorption-line ultraviolet and optical spectra of stars whose warm temperature…