Browsing by Author "Schawinski, Kevin"
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- ItemA model for AGN variability on multiple time-scales.(2018) Sartori, Lia F.; Treister, Ezequiel; Schawinski, Kevin; Trakhtenbrot, Benny; Caplar, Neven; Koss, M.; Urry, Claudia Megan; Zhang, Ce
- ItemA new, faint population of X-ray transients.(2017) Bauer, Franz Erik; Treister, Ezequiel; Schulze, Steve.; Schawinski, Kevin; Luo, B.; Alexander, D. M.; Brandt, W N.; Comastri, A.; Forster, Francisco; Gilli, Roberto
- ItemA population of luminous accreting black holes with hidden mergers(2018) Koss, Michael J.; Blecha, Laura; Bernhard, Phillip; Hung, Chao-Ling; Lu, Jessica R.; Trakhtenbrot, Benny; Treister, Ezequiel; Weigel, Anna; Sartori, Lia F.; Mushotzky, Richard; Schawinski, Kevin; Ricci, Claudio; Veilleux, Sylvain; Sanders, David B.
- ItemAGNs and their host galaxies in the local universe : two mass-independent Eddington ratio distribution functions characterize black hole growth.(2017) Weigel, Anna; Ezequiel Treister.; Schawinski, Kevin; Caplar, Neven; Wong, O. Ivy; Trakhtenbrot, Benny
- ItemBASS. XXV. DR2 Broad-line-based Black Hole Mass Estimates and Biases from Obscuration(2022) Mejía-Restrepo, Julian E.; Trakhtenbrot, Benny; Koss, Michael J.; Oh, Kyuseok; den Brok, Jakob; Stern, Daniel; Powell, Meredith C.; Ricci, Federica; Caglar, Turgay; Ricci, Claudio; Bauer, Franz Erik; Treister , Ezequiel; Harrison, Fiona A.; Urry, C. M.; Ananna, Tonima Tasnim; Asmus, Daniel; Assef, Roberto J.; Bär, Rudolf E.; Bessiere, Patricia S.; Burtscher, Leonard; Ichikawa, Kohei; Kakkad, Darshan; Kamraj, Nikita; Mushotzky, Richard; Privon, George C.; Rojas, Alejandra F.; Sani, Eleonora; Schawinski, Kevin; Veilleux, SylvainWe present measurements of broad emission lines and virial estimates of supermassive black hole masses (M _{BH} ) for a large sample of ultrahard X-ray-selected active galactic nuclei (AGNs) as part of the second data release of the BAT AGN Spectroscopic Survey (BASS/DR2). Our catalog includes M _{BH} estimates for a total of 689 AGNs, determined from the Hα, Hβ, Mg II λ2798, and/or C_{IV} λ1549 broad emission lines. The core sample includes a total of 512 AGNs drawn from the 70 month Swift/BAT all-sky catalog. We also provide measurements for 177 additional AGNs that are drawn from deeper Swift/BAT survey data. We study the links between M _{BH} estimates and line-of-sight obscuration measured from X-ray spectral analysis. We find that broad Hα emission lines in obscured AGNs (Log(N_{H} / cm^{-2} > 22.0) are on average a factor of 8.0_{-2.4}^{+4.1} weaker relative to ultrahard X-ray emission and about 35_{-12}^{,+7} % narrower than those in unobscured sources (i.e.(Log(N_{H} / cm^{-2} > 21.5). This indicates that the innermost part of the broad-line region is preferentially absorbed. Consequently, current single-epoch M _{BH} prescriptions result in severely underestimated (>1 dex) masses for Type 1.9 sources (AGNs with broad Hα but no broad Hβ) and/or sources with Log(N_{H} / cm^{-2} >= 22.0 . We provide simple multiplicative corrections for the observed luminosity and width of the broad Hα component (LbHα and FWHMbHα) in such sources to account for this effect and to (partially) remedy M _{BH} estimates for Type 1.9 objects. As a key ingredient of BASS/DR2, our work provides the community with the data needed to further study powerful AGNs in the low-redshift universe.
- ItemBAT AGN Spectroscopic Survey (BASS) – VI. The ΓX–L/LEdd relation.(2017) Trakhtenbrot, Benny; Ricci, Claudio; Treister, Ezequiel; Koss, M.; Schawinski, Kevin; Mushotzky, Richard; Ueda, Yoshihiro; Veilleux, Sylvain; Lamperti, Isabella; Oh, Kyuseok; Stern, Daniel; Harrison, F.; Baloković, Mislav; Gehrels, Neil
- ItemBAT AGN Spectroscopic Survey - III : an observed link between AGN Eddington ratio and narrow-emission-line ratios.(2017) Oh, Kyuseok; Ricci, Claudio; Treister, Ezequiel; Schawinski, Kevin; Koss, M.; Trakhtenbrot, Benny; Lamperti, Isabella; Mushotzky, Richard; Veilleux, Sylvain; Berney, Simon; Crenshaw, D. Michael
- ItemBAT AGN Spectroscopic Survey - IV : near-Infrared Coronal Lines, Hidden Broad Lines, and Correlation with Hard X-ray emission.(2017) Lamperti, Isabella; Ricci, Claudio; Treister, Ezequiel; Koss, M.; Trakhtenbrot, Benny; Schawinski, Kevin; Oh, Kyuseok; Landt, Hermine; Riffel, Rogério; Rodrìguez-Ardila, Alberto; Gehrels, Neil
- ItemBAT AGN Spectroscopic Survey - XVII. The parsec-scale jet properties of the ultrahard X-ray-selected local AGNs(2019) Baek, Junhyun; Chung, Aeree; Schawinski, Kevin; Oh, Kyuseok; Wong, O. Ivy; Koss, Michael; Ricci, Claudio; Trakhtenbrot, Benny; Smith, Krista Lynne; Ueda, Yoshihiro
- ItemBAT AGN Spectroscopic Survey. I. Spectral Measurements, Derived Quantities, and AGN Demographics.(2017) Koss, M.; Ricci, Claudio; Treister, Ezequiel; Trakhtenbrot, Benny; Lamperti, Isabella; Oh, Kyuseok; Berney, Simon; Schawinski, Kevin; Baloković, Mislav; Baronchelli, Linda; Crenshaw, D. Michael
- ItemBAT AGN Spectroscopic Survey. VIII. Type 1 AGN with Massive Absorbing Columns(2018) Shimizu, T. Taro; Davies, Richard I.; Koss, Michael; Ricci, Claudio; Lamperti, Isabella; Oh, Kyuseok; Schawinski, Kevin; Trakhtenbrot, Benny; Burtscher, Leonard; Genzel, Reinhard; Lin, Ming-yi; Lutz, Dieter; Rosario, David; Sturm, Eckhard; T
- ItemBlack hole growth in the early Universe is self-regulated and largely hidden from view.(2011) Treister, Ezequiel; Schawinski, Kevin; Volonteri, Marta; Natarajan, Priyamvada; Gawiser, Eric.
- ItemChandra Observations of Galaxy Zoo Mergers : Frequency of Binary Active Nuclei in Massive Mergers.(2012) Teng, Stacy H.; Treister, Ezequiel; Schawinski, Kevin; Urry, C. Meg; Darg, Dan W.; Kaviraj, Sugata; Oh, Kyuseok; Bonning, Erin W.; Cardamone, Carolin N.; Keel, William C.; Lintott, Chris J.; Simmons, Brooke D.
- ItemDo Moderate-Luminosity Active Galactic Nuclei Suppress Star Formation?(2009) Schawinski, Kevin; Treister, Ezequiel; Virani, Shanil; Simmons, Brooke D.; Urry, C. Megan; Kaviraj, Sugata; Kushkuley, Bronika
- ItemDust-corrected Colors Reveal Bimodality in the Host-galaxy Colors of Active Galactic Nuclei at z ~ 1.(2010) Cardamone, Carolin N.; Treister, Ezequiel; Urry, C. Meg; Schawinski, Kevin; Brammer, Gabriel; Gawiser, Eric
- ItemEvidence for Three Accreting Black Holes in a Galaxy at z ~ 1.35: A Snapshot of Recently Formed Black Hole Seeds?(2011) Schawinski, Kevin; Treister, Ezequiel; Urry, C. Meg; Simmons, Brooke D.; Natarajan, Priyamvada; Glikman, Eilat
- ItemExtended X-ray emission in the IC 2497 - Hanny's Voorwerp system: energy injection in the gas around a fading AGN.(2016) Sartori, Lia F.; Schawinski, Kevin; Koss, M.; Treister, Ezequiel; Maksym, W. Peter; Keel, William C.; Urry, C. Megan; Lintott, Chris J.; Wong, O. Ivy
- ItemGalaxy Zoo: The Fundamentally Different Co-Evolution of Supermassive Black Holes and Their Early- and Late-Type Host Galaxies.(2010) Schawinski, Kevin; Treister, Ezequiel; Urry, C. Meg; Virani, Shanil; Coppi, Paolo; Bamford, Steven P.; Lintott, Chris J.; Sarzi, Marc; Keel, William C.; Kaviraj, Sugata; Cardamone, Carolin N.
- ItemHeavily Obscured Active Galactic Nuclei in High-redshift Luminous Infrared Galaxies.(2010) Treister, Ezequiel; Urry, C. Meg; Schawinski, Kevin; Cardamone, Carolin N.; Sanders, David B.
- ItemHeavily Obscured AGN in Star-Forming Galaxies at z sime 2.(2009) Treister, Ezequiel; Cardamone, Carolin N.; Schawinski, Kevin; Urry, C. Meg; Gawiser, Eric.; Virani, Shanil; Lira, Paulina; Kartaltepe, Jeyhan; Damen, Maaike; Taylor, EN.; Le Floc'H e; Justham, Stephen; Koekemoer, Anton M.