Zobrazeno 1 - 10
of 316
pro vyhledávání: '"Laor, Ari"'
We present the pc-scale radio spectra of a representative sample of 13 Palomar-Green (PG) radio-quiet quasars (RQQ), based on our new Very Long Baseline Array (VLBA) observations at 8.4 and 23.6 GHz and our earlier VLBA studies at 1.5 and 5.0 GHz. Th
Externí odkaz:
http://arxiv.org/abs/2410.07889
Autor:
Chen, Sina, Laor, Ari, Behar, Ehud, Baldi, Ranieri D., Gelfand, Joseph D., Kimball, Amy E., McHardy, Ian M., Orosz, Gabor, Paragi, Zsolt
Does a broad-line region (BLR) wind in radio-quiet (RQ) active galactic nuclei (AGN) extend to pc scales and produce radio emission? We explore the correlations between a pc-scale radio wind and the BLR wind in a sample of 19 RQ Palomar-Green (PG) qu
Externí odkaz:
http://arxiv.org/abs/2408.15934
Autor:
McKaig, Jeffrey D., Satyapal, Shobita, Laor, Ari, Abel, Nicholas P., Doan, Sara M., Ricci, Claudio, Cann, Jenna M.
Forbidden collisionally excited optical atomic transitions from high ionization potential (IP$\geq$54.8\,eV) ions, such as Ca$^{\mathrm{4+}}$, Ne$^{\mathrm{4+}}$, Fe$^{\mathrm{6+}}$, Fe$^{\mathrm{10+}}$, Fe$^{\mathrm{13+}}$, Ar$^{\mathrm{9+}}$, and S
Externí odkaz:
http://arxiv.org/abs/2408.15229
Autor:
Meyer, Eileen T., Laha, Sibasish, Shuvo, Onic I., Roychowdhury, Agniva, Green, David A., Rhodes, Lauren, Hankla, Amelia M., Philippov, Alexander, Mbarek, Rostom, laor, Ari, Begelman, Mitchell C., Sadaula, Dev R., Ghosh, Ritesh, Bruni, Gabriele, Panessa, Francesca, Guainazzi, Matteo, Behar, Ehud, Masterson, Megan, Zhang, Haocheng, Yang, Xiaolong, Gurwell, Mark A., Keating, Garrett K., Williams-Baldwin, David, Bray, Justin D., Bempong-Manful, Emmanuel K., Wrigley, Nicholas, Bianchi, Stefano, Ricci, Federica, La Franca, Fabio, Kara, Erin, Georganopoulos, Markos, Oates, Samantha, Nicholl, Matt, Pal, Main, Cenko, S. Bradley
We present multi-frequency (5-345 GHz) and multi-resolution radio observations of 1ES 1927+654, widely considered one of the most unusual and extreme changing-look active galactic nuclei (CL-AGN). The source was first designated a CL-AGN after an opt
Externí odkaz:
http://arxiv.org/abs/2406.18061
Autor:
Chen, Sina, Kharb, Preeti, Sasikumar, Silpa, Nandi, Sumana, Berton, Marco, Jarvela, Emilia, Laor, Ari, Behar, Ehud, Foschini, Luigi, Vietri, Amelia, Gu, Minfeng, La Mura, Giovanni, Crepaldi, Luca, Zhou, Minhua
We present new 1.5-8.5 GHz Very Long Baseline Array (VLBA) observations and 0.32-1.26 GHz Giant Meterwave Radio Telescope (GMRT) observations of J0354-1340, which is the only known radio-quiet (RQ) or radio-intermediate (RI) narrow-line Seyfert 1 gal
Externí odkaz:
http://arxiv.org/abs/2312.13351
The origin of the radio emission in radio-quiet quasars (RQQ) is not established yet. We present new VLBA observations at 1.6 and 4.9 GHz of ten RQQ (nine detected), which together with published earlier observations of eight RQQ (five detected), for
Externí odkaz:
http://arxiv.org/abs/2307.13599
Autor:
Ricci, Claudio, Chang, Chin-Shin, Kawamuro, Taiki, Privon, George, Mushotzky, Richard, Trakhtenbrot, Benny, Laor, Ari, Koss, Michael J., Smith, Krista L., Gupta, Kriti K., Dimopoulos, Georgios, Aalto, Susanne, Ros, Eduardo
Recent studies have proposed that the nuclear millimeter continuum emission observed in nearby active galactic nuclei (AGN) could be created by the same population of electrons that gives rise to the X-ray emission that is ubiquitously observed in ac
Externí odkaz:
http://arxiv.org/abs/2306.04679
Autor:
Bianchi, Stefano, Chiaberge, Marco, Laor, Ari, Antonucci, Robert, Bagul, Atharva, Capetti, Alessandro
A previous narrow-slit ($0.1$ arcsec) Hubble Space Telescope observation unveiled a broad relativistic H$\alpha$ profile in NGC3147, a low-luminosity ($\mathrm{L_{bol}}\sim10^{42}$ erg s$^{-1}$), low-Eddington ratio ($\mathrm{L_{bol}/L_{Edd}}\sim10^{
Externí odkaz:
http://arxiv.org/abs/2209.01807
Quasi-simultaneous observations of radio and X-ray variability in three radio-quiet Seyfert galaxies
Radio variability in some radio-quiet (RQ) active galactic nuclei suggests emission from regions close to the central engine, possibly the outer accretion disc corona. If the origins of the radio and the X-ray emission are physically related, their e
Externí odkaz:
http://arxiv.org/abs/2207.01601
Autor:
Fu, Shuqi, Brandt, W. N., Zou, Fan, Laor, Ari, Garmire, Gordon P., Ni, Qingling, Timlin III, John D., Xue, Yongquan
We report results for a complete sample of ten luminous radio-quiet quasars with large C IV equivalent widths (EW > 150 A). For 8/10 we performed Chandra snapshot observations. We find that, in addition to the enhanced C IV line EW, their He II and M
Externí odkaz:
http://arxiv.org/abs/2206.11631