Zobrazeno 1 - 10
of 182
pro vyhledávání: '"Plotkin, Richard M"'
Autor:
Dage, Kristen C., Tremou, Evangelia, Otahola, Bolivia Cuevas, Koch, Eric W., Oh, Kwangmin, Plotkin, Richard M., Tang, Vivian L., Aldhalemi, Muhammad Ridha, Bustani, Zainab, Fawaz, Mariam Ismail, Harff, Hans J., Khalyleh, Amna, McBride, Timothy, Mason, Jesse, Preston, Anthony, Rinehart, Cortney, Vinson, Ethan, Anderson, Gemma, Cackett, Edward M., Fu, Shih Ching, Kamann, Sebastian, Panurach, Teresa, Pechetti, Renuka, Saikia, Payaswini, Sett, Susmita, Urquhart, Ryan, Usher, Christopher
Intermediate mass black holes (10^2 < M_BH< 10^5 Msun) are an open question in our understanding of black hole evolution and growth. They have long been linked to dense star cluster environments thanks to cluster dynamics, but there are a limited num
Externí odkaz:
http://arxiv.org/abs/2412.07284
Autor:
Panurach, Teresa, Dage, Kristen C., Urquhart, Ryan, Plotkin, Richard M., Paul, Jeremiah D., Bahramian, Arash, Brumback, McKinley C., Galvin, Timothy J., Molina, Isabella, Miller-Jones, James C. A., Saikia, Payaswini
Ultraluminous X-ray sources (ULXs) were once largely believed to be powered by super-Eddington accretion onto stellar-mass black holes, although in some rare cases, ULXs also serve as potential candidates for (sub-Eddington) intermediate mass black h
Externí odkaz:
http://arxiv.org/abs/2410.23335
Autor:
Chen, Ying, Luo, Bin, Brandt, W. N., Zuo, Wenwen, Dix, Cooper, Ha, Trung, Matthews, Brandon, Paul, Jeremiah D., Plotkin, Richard M., Shemmer, Ohad
We present near-infrared spectroscopy of ten weak emission-line quasars (WLQs) at redshifts of $z\sim2$, obtained with the Palomar 200-inch Hale Telescope. WLQs are an exceptional population of type 1 quasars that exhibit weak or no broad emission li
Externí odkaz:
http://arxiv.org/abs/2407.03422
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:
Paul, Jeremiah D., Plotkin, Richard M., Brandt, W. N., Ellis, Christopher H., Gallo, Elena, Greene, Jenny E., Ho, Luis C., Kimball, Amy E., Haggard, Daryl
Publikováno v:
ApJ 974 66 (2024)
The supermassive black holes ($M_{\rm BH} \sim 10^{6}$$-$$10^{10}~M_\odot$) that power luminous active galactic nuclei (AGNs), i.e., quasars, generally show a correlation between thermal disk emission in the ultraviolet (UV) and coronal emission in h
Externí odkaz:
http://arxiv.org/abs/2404.02423
Autor:
Nair, Sneha, Dage, Kristen, Haggard, Daryl, Kundu, Arunav, Plotkin, Richard M., Rhode, Katherine L., Zepf, Stephen E.
Utilising archival Chandra X-ray Observatory data and Hubble Space Telescope globular cluster catalogues, we probe the time-domain properties of the low mass X-ray binary population in the elliptical galaxy NGC 4261. Of the 98 unique X-ray sources id
Externí odkaz:
http://arxiv.org/abs/2306.11948
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:
Dix, Cooper, Matthews, Brandon, Shemmer, Ohad, Brotherton, Michael S., Myers, Adam D., Andruchow, I., Brandt, W. N., Ferrero, Gabriel A., Green, Richard, Lira, Paulina, Plotkin, Richard M., Richards, Gordon T., Schneider, Donald P.
The most reliable single-epoch supermassive black hole mass ($M_{\rm BH}$) estimates in quasars are obtained by using the velocity widths of low-ionization emission lines, typically the H$\beta$ $\lambda4861$ line. Unfortunately, this line is redshif
Externí odkaz:
http://arxiv.org/abs/2304.02142
Autor:
Yang, Qian, Green, Paul J., MacLeod, Chelsea L., Plotkin, Richard M., Anderson, Scott F., Bieryla, Allyson, Civano, Francesca, Eracleous, Michael, Graham, Matthew, Ruan, John J., Runnoe, Jessie, Zhao, Xiurui
Extremely variable quasars can also show strong changes in broad-line emission strength and are known as changing-look quasars (CLQs). To study the CLQ transition mechanism, we present a pilot sample of CLQs with X-ray observations in both the bright
Externí odkaz:
http://arxiv.org/abs/2303.06733
Autor:
Thygesen, Erica, Plotkin, Richard M., Soria, Roberto, Reines, Amy E., Greene, Jenny E., Anderson, Gemma E., Baldassare, Vivienne F., Owens, Milo G., Urquhart, Ryan T., Gallo, Elena, Miller-Jones, James C. A., Paul, Jeremiah D., Rollings, Alexandar P.
Owing to their quiet evolutionary histories, nearby dwarf galaxies (stellar masses $M_\star \lesssim 3 \times 10^9 M_\odot$) have the potential to teach us about the mechanism(s) that 'seeded' the growth of supermassive black holes, and also how the
Externí odkaz:
http://arxiv.org/abs/2301.01317