Zobrazeno 1 - 10
of 788
pro vyhledávání: '"Richards, Gordon"'
Autor:
Temple, Matthew J., Rankine, Amy L., Banerji, Manda, Hennawi, Joseph F., Hewett, Paul C., Matthews, James H., Nanni, Riccardo, Ricci, Claudio, Richards, Gordon T.
Publikováno v:
MNRAS 532, 424-437 (2024)
Understanding the links between different phases of outflows from active galactic nuclei is a key goal in extragalactic astrophysics. Here we compare [OIII] $\lambda\lambda$4960,5008 outflow signatures in quasars with and without Broad Absorption Lin
Externí odkaz:
http://arxiv.org/abs/2406.11968
Autor:
Green, Kaylie S., Gallagher, Sarah C., Leighly, Karen M., Choi, Hyunseop, Grupe, Dirk, Terndrup, Donald M., Richards, Gordon T., Komossa, S.
Publikováno v:
2023, ApJ, 953, 186
Broad Absorption Line Quasars (BALQs) are actively accreting supermassive black holes that have strong outflows characterized by broad absorption lines in their rest-UV spectra. Variability in these absorption lines occurs over months to years depend
Externí odkaz:
http://arxiv.org/abs/2405.06027
Autor:
Ahmed, Harum, Shemmer, Ohad, Matthews, Brandon, Dix, Cooper, Ha, Trung, Richards, Gordon T., Brotherton, Michael S., Myers, Adam D., Brandt, W. N., Gallagher, Sarah C., Green, Richard, Lira, Paulina, McLane, Jacob N., Plotkin, Richard M., Schneider, Donald P.
We present the rest-frame ultraviolet-optical spectral properties of 65 broad absorption line (BAL) quasars from the Gemini Near Infrared Spectrograph-Distant Quasar Survey (GNIRS-DQS). These properties are compared with those of 195 non-BAL quasars
Externí odkaz:
http://arxiv.org/abs/2404.12343
Autor:
Leighly, Karen M., Choi, Hyunseop, Eracleous, Michael, Terndrup, Donald M., Gallagher, Sarah C., Richards, Gordon T.
We present the optical-near infrared spectral energy distributions (SED) and near infrared variability properties of 30 low-redshift iron low-ionization Broad Absorption Line quasars (FeLoBALQs) and matched samples of LoBALQs and unabsorbed quasars.
Externí odkaz:
http://arxiv.org/abs/2402.07855
Autor:
Matthews, James H., Strong-Wright, Jago, Knigge, Christian, Hewett, Paul, Temple, Matthew J., Long, Knox S., Rankine, Amy L., Stepney, Matthew, Banerji, Manda, Richards, Gordon T.
Publikováno v:
MNRAS 526, pp.3967-3986 (2023)
Blueshifts - or, more accurately, blue asymmetries - in broad emission lines such as CIV $\lambda$1550 are common in luminous quasars and correlate with fundamental properties such as Eddington ratio and broad absorption line (BAL) characteristics. H
Externí odkaz:
http://arxiv.org/abs/2309.14434
Autor:
Savić, Đorđe V., Jankov, Isidora, Yu, Weixiang, Petrecca, Vincenzo, Temple, Matthew J., Ni, Qingling, Shirley, Raphael, Kovacevic, Andjelka B., Nikolic, Mladen, Ilic, Dragana, Popovic, Luka C., Paolillo, Maurizio, Panda, Swayamtrupta, Ciprijanovic, Aleksandra, Richards, Gordon T.
Development of the Rubin Observatory Legacy Survey of Space and Time (LSST) includes a series of Data Challenges (DC) arranged by various LSST Scientific Collaborations (SC) that are taking place during the projects preoperational phase. The AGN Scie
Externí odkaz:
http://arxiv.org/abs/2307.04072
Autor:
Stepney, Matthew, Banerji, Manda, Hewett, Paul C., Temple, Matthew J., Rankine, Amy L., Matthews, James H., Richards, Gordon T.
We analyse the rest-frame UV spectra of 2,531 high-redshift (3.5
Externí odkaz:
http://arxiv.org/abs/2307.02962
Autor:
Trefoloni, Bartolomeo, Lusso, Elisabeta, Nardini, Emanuele, Risaliti, Guido, Bargiacchi, Giada, Bisogni, Susanna, Civano, Francesca M., Elvis, Martin, Fabbiano, Giuseppina, Gilli, Roberto, Marconi, Alessandro, Richards, Gordon T., Sacchi, Andrea, Salvestrini, Francesco, Signorini, Matilde, Vignali, Cristian
We present the analysis of the rest frame ultraviolet and optical spectra of 30 bright blue quasars at $z\sim3$, selected to examine the suitability of AGN as cosmological probes. In our previous works, we found an unexpectedly high fraction ($\appro
Externí odkaz:
http://arxiv.org/abs/2305.07699
Autor:
Matthews, Brandon M., Dix, Cooper, Shemmer, Ohad, Brotherton, Michael S., Myers, Adam D., Andruchow, I., Brandt, W. N., Gallagher, S. C., Green, Richard, Lira, Paulina, McLane, Jacob N., Plotkin, Richard M., Richards, Gordon T., Runnoe, Jessie C., Schneider, Donald P., Strauss, Michael A.
Quasars at $z~{\gtrsim}~1$ most often have redshifts measured from rest-frame ultraviolet emission lines. One of the most common such lines, C IV ${\lambda}1549$, shows blueshifts up to ${\approx}~5000~\rm{km~s^{-1}}$, and in rare cases even higher.
Externí odkaz:
http://arxiv.org/abs/2304.09964
Autor:
Ha, Trung, Dix, Cooper, Matthews, Brandon M., Shemmer, Ohad, Brotherton, Michael S., Myers, Adam, Richards, Gordon T., Maithil, Jaya, Anderson, Scott F., Brandt, W. N., Diamond-Stanic, Aleksandar M., Fan, Xiaohui, Gallagher, Sarah C., Green, Richard F., Lira, Paulina, Luo, Bin, Netzer, Hagai, Plotkin, Richard, Runnoe, Jessie C., Schneider, Donald P., Strauss, Michael A., Trakhtenbrot, Benny, Wu, Jianfeng
Weak emission-line quasars (WLQs) are a subset of Type 1 quasars that exhibit extremely weak Ly$\alpha +$N V $\lambda$1240 and/or C IV $\lambda$1549 emission lines. We investigate the relationship between emission-line properties and accretion rate f
Externí odkaz:
http://arxiv.org/abs/2304.04783