Browsing by Subject "Galaxies: active"

Now showing items 1-20 of 32

    • A new, faint population of X-ray transients 
      Bauer, Franz E.; Treister, Ezequiel; Schawinski, Kevin; Schulze, Steve; Luo, Bin; Alexander, David M.; Brandt, William N.; Comastri, Andrea; Forster, Francisco; Gilli, Roberto; Kann, David Alexander; Maeda, Keiichi; Nomoto, Ken'ichi; Paolillo, Maurizio; Ranalli, Piero; Schneider, Donald P.; Shemmer, Ohad; Tanaka, Masaomi; Tolstov, Alexey; Tominaga, Nozomu; Tozzi, Paolo; Vignali, Cristian; Wang, Junxian; Xue, Yongquan; Yang, Guang (Oxford University Press, 2017)
      © 2017 The Authors. We report on the detection of a remarkable new fast high-energy transient found in the Chandra Deep Field-South, robustly associated with a faint (mR = 27.5mag, zph ~2.2) host in the CANDELS survey. The ...
    • Active galactic nuclei at z similar to 1.5-I. Spectral energy distribution and accretion discs 
      Capellupo, D. M.; Netzer, H.; Lira Teillery, Paulina; Trakhtenbrot, B.; Mejía Restrepo, Julián (Oxford University Press, 2015)
      The physics of active super massive black holes (BHs) is governed by their mass (MBH), spin (a(*)) , and accretion rate ((M) over dot). This work is the first in a series of papers with the aim of testing how these parameters ...
    • Active galactic nuclei at z ∼ 1.5 – II. Black hole mass estimation by means of broad emission lines 
      Mejía Restrepo, Julián; Trakhtenbrot, Benny; Lira Teillery, Paulina; Netzer, H.; Capellupo, Daniel (Oxford University Press, 2016)
      This is the second in a series of papers aiming to test how the mass (M-BH), accretion rate (M) over dot and spin (a(*)) of supermassive black holes (SMBHs) determine the observed properties of type I active galactic nuclei ...
    • AGN feedback in the nucleus of M51 
      Querejeta, M.; Schinnerer, E.; García Burillo, S.; Bigiel, F.; Blanc Mendiberri, Guillermo; Colombo, D.; Hughes, A.; Kreckel, K.; Leroy, A. K.; Meidt, S. E.; Meier, D. S.; Pety, J.; Sliwa, K. (EDP Sciences, 2016)
      AGN feedback is invoked as one of the most relevant mechanisms that shape the evolution of galaxies. Our goal is to understand the interplay between AGN feedback and the interstellar medium in M 51, a nearby spiral galaxy ...
    • ALMA Observations Show Major Mergers among the Host Galaxies of Fast-growing, High-redshift, Supermassive ... 
      Trakhtenbrot, Benny; Lira Teillery, Paulina; Netzer, Hagai; Cicone, Claudia; Maiolino, Roberto; Shemmer, Ohad (IOP Publishing, 2017)
      We present new ALMA band-7 data for a sample of six luminous quasars at z similar or equal to 4.8, powered by fast-growing supermassive black holes (SMBHs) with rather uniform properties: the typical accretion rates and ...
    • Evidence for Periodicity in 43 Year-Long Monitoring of NGC 5548 
      Bon, Edi; Zucker, S.; Netzer, H.; Marziani, Paola; Bon, N.; Jovanovic, Predrag; Shapovalova, A. I.; Komossa, S.; Gaskell, C. M.; Popović, Ljiljana; Britzen, Stefan; Chavushyan, V. H.; Burenkov, A.; Sergeev, S. G.; La Mura, Giovanni; Valdés, J. R.; Stalevski, Marko (IOP, 2016)
      We present an analysis of 43 years (1972 to 2015) of spectroscopic observations of the Seyfert 1 galaxy NGC 5548. This includes 12 years of new unpublished observations (2003 to 2015). We compiled about 1600 H beta spectra ...
    • Exploratory X-ray monitoring of luminous radio-quiet quasars at high redshift: initial results 
      Shemmer, Ohad; Brandt, W. N.; Paolillo, Maurizio; Kaspi, Shai; Vignali, Cristian; Stein, Matthew S.; Lira Teillery, Paulina; Schneider, Donald P.; Gibson, Robert R. (The American Astronomical Society, 2014)
      We present initial results from an exploratory X-ray monitoring project of two groups of comparably luminous radio-quiet quasars (RQQs). The first consists of four sources at 4.10 z 4.35, monitored by Chandra, and ...
    • Faint Cosmos AGNs AT z ∼ 3.3. I. Black Hole Properties and Constraints on Early Black Hole Growth 
      Trakhtenbrot, Benny; Civano, F.; Urry, C. Megan; Schawinski, Kevin; Marchesi, Simone; Elvis, M. S.; Rosario, D. J.; Suh, H.; Mejía-Restrepo, Julian; Simmons, B. D.; Faisst, Andreas; Onodera, M. (IOP, 2016)
      We present new Keck/MOSFIRE K-band spectroscopy for a sample of 14 faint, X-ray-selected active galactic nuclei (AGNs) in the COSMOS field. The data cover the spectral region surrounding the broad Balmer emission lines, ...
    • GLACE survey: OSIRIS/GTC tuneable filter H alpha imaging of the rich galaxy cluster ZwCl 0024.0+1652 at z=0.395 
      Sánchez Portal, M.; Pintos Castro, I.; Pérez Martínez, R.; Cepa, J.; Pérez García, A. M.; Domínguez Sánchez, H.; Bongiovanni, A.; Serra, A. L.; Alfaro, E.; Altieri, B.; Aragón Salamanca, A.; Balkowski, C.; Biviano, A.; Bremer, M.; Castander, F.; Castañeda, H.; Castro Rodríguez, N.; Chies Santos, A. L.; Coia, D.; Diaferio, A.; Duc, P. A.; Ederoclite, A.; Geach, J.; González Serrano, I.; Haines, Chris; McBreen, B.; Metcalfe, L.; Oteo, I.; Pérez Fournón, I.; Poggianti, B.; Polednikova, J.; Ramón Pérez, M.; Rodríguez Espinosa, J. M.; Santos, J. S.; Smail, I.; Smith, G. P.; Temporin, S.; Valtchanov, I. (ESA, 2015)
      The cores of clusters at 0 less than or similar to z less than or similar to 1 are dominated by quiescent early-type galaxies, whereas the field is dominated by star-forming late-type galaxies. Clusters grow through the ...
    • A herschel study of 24 mu m-selected AGNs and their host galaxies 
      Xu, Lei; Rieke, G. H.; Egami, E.; Pereira, M. J.; Haines, Chris; Smith, G. P. (IOP Publishing, 2015)
      We present a sample of 290 24 mu m-selected active galactic nuclei (AGNs) mostly at z similar to 0.3-2.5, within 5.2 deg(2) distributed as 25' x 25' fields around each of 30 galaxy clusters in the Local Cluster Substructure ...
    • LoCuSS: the slow quenching of star formation in cluster galaxies and the need for pre-processing 
      Haines, Chris; Pereira, M. J.; Smith, G. P.; Egami, E.; Babul, A.; Finoguenov, A.; Ziparo, F.; McGee, S. L.; Rawle, T. D.; Okabe, N.; Moran, S. M. (IOP Publishing, 2015)
      We present a study of the spatial distribution and kinematics of star-forming galaxies in 30 massive clusters at 0.15 < z < 0.30, combining wide-field Spitzer 24 mu m and GALEX near-ultraviolet imaging with highly complete ...
    • Long-term monitoring of the archetype Seyfert galaxy MCG-6-30-15: X-ray, optical and near-IR variability ... 
      Lira Teillery, Paulina; Arevalo, P.; Uttley, P.; McHardy, I.; Videla, L. (Royal Astronomical Society, 2015)
      We present long-term monitoring of MCG-6-30-15 in X-rays, optical and near-IR wavelengths, collected over 5 yr of monitoring. We determine the power spectrum density of all the observed bands and show that after taking ...
    • Multiwavelength cross-correlations and flaring activity in bright blazars 
      Liodakis, I.; Romani, R.; Filippenko, A.; Kiehlmann, S.; Max-Moerbeck, W.; Readhead, A.; Zheng, W. (Oxford University Press, 2018)
      © 2018 The Author(s). Blazars are known for their energetic multiwavelength flares from radio wavelengths to highenergy γ -rays. In thiswork, we study radio, optical, and γ -ray light curves of 145 bright blazars spanning ...
    • MUSE reveals a recent merger in the post-starburst host galaxy of the TDE ASASSN-14li 
      Prieto, J. L.; Kruehler, T.; Anderson, J. P.; Galbany, Lluis; Kochanek, C. S.; Aquino, E.; Brown, J. S.; Dong, Subo; Forster, Francisco; Holoien, T. W.-S.; Kuncarayakti, H.; Maureira, J. C.; Rosales Ortega, F. F.; Sánchez, S. F.; Shappee, B. J.; Stanek, K. Z. (IOP Publishing, 2016)
      We present Multi Unit Spectroscopic Explorer (MUSE) integral field spectroscopic observations of the host galaxy (PGC 043234) of one of the closest (z = 0.0206, D similar or equal to 90 Mpc) and best-studied tidal disruption ...
    • The nuclear near-infrared spectral properties of nearby galaxies 
      Mason, R.; Rodríguez Ardila, A.; Martins, L.; Riffel, R.; González Martín, Omaira; Ramos Almeida, C.; Ruschel Dutra, D.; Ho, L.; Thanjavur, K.; Flohic, H.; Alonso Herrero, A.; Lira Teillery, Paulina; McDermid, R.; Riffel, R.; Schiavon, R.; Winge, C.; Hoenig, M.; Perlman, E. (IOP Publishing, 2015)
      We present spectra of the nuclear regions of 50 nearby (D = 1-92 Mpc, median = 20 Mpc) galaxies of morphological types E to Sm. The spectra, obtained with the Gemini Near-IR Spectrograph on the Gemini North telescope, cover ...
    • On the nature of AGN and star formation enhancement in the z=3.1 SSA22 protocluster: the HST WFC3 IR view 
      Monson, Erik B.; Lehmer, Bret D.; Doore, Keith; Eufrasio, Rafael T.; Bonine, Brett; Alexander, David M.; Harrison, Chris M.; Kubo, Mariko; Mantha, Kameswara B.; Sáez, Cristian; Straughn, Amber; Umehata, Hideki (IOP, 2021)
      We examine possible environmental sources of the enhanced star formation and active galactic nucleus (AGN) activity in the z = 3.09 SSA22 protocluster using Hubble WFC3 F160W (similar to 1.6 mu m) observations of the SSA22 ...
    • Optical spectroscopy of blazars for the Cherenkov Telescope Array 
      Goldoni, P.; Pita, S.; Boisson, C.; Max-Moerbeck Astudillo, Walter Kennerth; Kasai, E.; Williams, D. A.; D’Ammando, F.; Navarro Aránguiz, Víctor Alberto; Backes, M.; Barres de Almeida, U.; Becerra González, J.; Cotter, G.; Hervet, O.; Lenain, J. P.; Lindfors, E.; Sol, H.; Wagner, S. (Elsevier, 2021)
      Context. Blazars are the most numerous class of high-energy (HE; E similar to 50 MeV-100 GeV) and very high-energy (VHE; E similar to 100 GeV-10 TeV) gamma-ray emitters. Currently, a measured spectroscopic redshift is ...
    • Potential and sky coverage for off-axis fringe tracking in optical long baseline interferometry 
      Boskri, Abdelkarim; Petrov, Romain G.; El Halkouj, Thami; Hadjara, Macinissa; Leftley, James; Benkhaldoun, Zouhair; Cruzalebes, Pierre; Ziad, Aziz; Carbillet, Marcel (Oxford, 2021)
      The spectacular results provided by the second-generationVLTI instruments GRAVITY and MATISSE on active galactic nuclei (AGN) trigger and justify a strong increase in the sensitivity limit of optical interferometers. A key ...
    • The relation between luminous AGNs and star formation in their host galaxies 
      Xu, Lei; Rieke, G. H.; Egami, E.; Haines, Chris; Pereira, M. J.; Smith, G. P. (IOP Publishing, 2015)
      We study the relation of active galactic nuclei (AGNs) to star formation in their host galaxies. Our sample includes 205 Type-1 and 85 Type-2 AGNs, 162 detected with Herschel, from fields surrounding 30 galaxy clusters in ...
    • Space telescope and optical reverberation mapping project. I. Ultraviolet observations of the seyfert 1 ... 
      Rosa, G. de; Peterson, B. M.; Ely, J.; Kriss, G. A.; Crenshaw, D. M.; Horne, Keith; Korista, K. T.; Netzer, H.; Pogge, R. W.; Arévalo, P.; Barth, A. J.; Bentz, M. C.; Brandt, W. N.; Breeveld, A. A.; Brewer, B. J.; Dalla Bontà, E.; Lorenzo Cáceres, A. de; Denney, K. D.; Dietrich, M.; Edelson, R.; Evans, P. A.; Fausnaugh, M. M.; Gehrels, N.; Gelbord, J. M.; Goad, M. R.; Grier, C. J.; Grupe, D.; Hall, P. B.; Kaastra, J.; Kelly, B. C.; Kennea, J. A.; Kochanek, C. S.; Lira Teillery, Paulina; Mathur, S.; McHardy, I. M.; Nousek, J. A.; Pancoast, A.; Papadakis, I.; Pei, L.; Schimoia, J. S.; Siegel, M.; Starkey, D.; Treu, T.; Uttley, P.; Vaughan, S.; Vestergaard, M.; Villforth, C.; Yan, H.; Young, S.; Zu, Y. (IOP Publishing, 2015)
      We describe the first results from a six-month long reverberation-mapping experiment in the ultraviolet based on 171 observations of the Seyfert 1 galaxy NGC 5548 with the Cosmic Origins Spectrograph on the Hubble Space ...