Probing the Balance of AGN and Star-Forming Activity in the Local Universe with ChaMP (2009)
Constantin, Anca, Green, Paul, Aldcroft, Tom, Kim, Dong-Woo, Haggard, Daryl, Barkhouse, Wayne, ...
The combination of the SDSS and the Chandra Multiwavelength Project (ChaMP) currently offers the largest and most homogeneously selected sample of nearby galaxies for investigating the relation...
Active Galactic Nuclei in Void Regions (2007)
Constantin, Anca, Hoyle, Fiona, Vogeley, Michael S.
We present a comprehensive study of accretion activity in the most underdense environments in the universe, the voids, based on the SDSS DR2 data. Based on investigations of multiple void regions, we...
Source Matching in the SDSS and RASS: Which Galaxies are Really X-ray Sources? (2007)
Parejko, John K., Constantin, Anca, Vogeley, Michael S., Hoyle, Fiona
The current view of galaxy formation holds that all massive galaxies harbor a massive black hole at their center, but that these black holes are not always in an actively accreting phase. X-ray...
The Large Scale Structure of LINERs and Seyferts and Implications for their Central Engines (2006)
Constantin, Anca, Vogeley, Michael S.
We discuss here the spatial clustering of Seyferts and LINERs and consequences for their central engines. We show that Seyferts are less clustered than LINERs, and that this difference is not driven...
The Spatial Clustering of Low Luminosity AGN (2006)
Constantin, Anca, Vogeley, Michael S.
We present the first multi-parameter analysis of the narrow line AGN clustering properties. Estimates of the two-point correlation function (CF) based on SDSS DR2 data reveal that Seyferts are...
Quasars and Narrow-Line Seyfert 1s: Trends and Selection Effects (2004)
Shields, Joseph C., Constantin, Anca
The SDSS has opened a new era for the study of AGN spectroscopic properties and how these depend on luminosity and time. In this presentation we review some of the current issues and problems in...
This dissertation searches for common grounds for the diversity of properties exhibited by the emission-line nuclei of galaxies, from large look-back times to the local universe. I present results of...
Thesis (Ph. D.)--Ohio University, August, 2004.
This dissertation searches for common grounds for the diversity of properties exhibited by the emission-line nuclei of galaxies, from large look-back times to the local universe. I present results of...
Thesis (Doctoral)--Ohio University, 2004.
Constantin, Anca., OhioLINK Electronic Theses And Dissertations Center.
Title from PDF t.p.
Thesis (Ph. D.)--Ohio University, August, 2004.
Thesis (Ph.D.)--Ohio University, August, 2004.
Thesis (Ph. D.)--Ohio University, August, 2004.
Emission and absorption in Narrow-Line Seyfert 1 Galaxies (2003)
Constantin, Anca, Shields, Joseph C.
The emission and absorption attributes of the UV-blue nuclear spectra of the Narrow-Line Seyfert 1 (NLS1) galaxies are analyzed based on high quality archival HST observations. Measurements from...
Ultraviolet and optical properties of Narrow-Line Seyfert 1 galaxies (2003)
Constantin, Anca, Shields, Joseph C.
Narrow Line Seyfert 1 (NLS1) galaxies are remarkable for their extreme continuum and emission line properties which are not well understood. New results bearing on the spectroscopic characteristics...
The Metallicity of the Redshift 4.16 Quasar BR2248-1242 (2001)
Warner, Craig, Hamann, Fred, Shields, Joseph C., Constantin, Anca, Foltz, Craig B., Chaffee, Frederic H.
We estimate the metallicity in the broad emission-line region of the redshift z=4.16 quasar, BR2248-1242, by comparing line ratios involving nitrogen to theoretical predictions. BR2248-1242 has...
Emission-Line Properties of z > 4 Quasars (2001)
Constantin, Anca, Shields, Joseph C., Hamann, Fred, Foltz, Craig B., Chaffee, Frederic H.
We present results of a program of high signal-to-noise spectroscopy for 44 QSOs at redshifts > 4 using the MMT and Keck observatories. The quasar spectra cover 1100 -- 1700 A in the rest frame for...