Results 11 to 20 of about 10,836 (194)

Evidence of First Stars-enriched Gas in High-redshift Absorbers

The Astrophysical Journal, 2023
The first stars were born from chemically pristine gas. They were likely massive, and thus they rapidly exploded as supernovae, enriching the surrounding gas with the first heavy elements.
Andrea Saccardi, Stefania Salvadori, Valentina D’Odorico, Guido Cupani, Michele Fumagalli, Trystyn A. M. Berg, George D. Becker, Sara Ellison, Sebastian Lopez   +8 more
doaj   +1 more source

Andromeda's Parachute: A Bright Quadruply Lensed Quasar at z=2.377 [PDF]

, 2017
We present Keck Cosmic Web Imager spectroscopy of the four putative images of the lensed quasar candidate J014709+463037 recently discovered by Berghea et al. (2017).
Cooksey, Kathy L., Doppmann, Gregory W., Kwok, Shui Hung, Martin, D. Christopher, Matuszewski, Mateusz, Moore, Anna M., Morrissey, Patrick, Neill, James D., O'Meara, John M., Rizzi, Luca, Rubin, Kate H. R.   +10 more
core   +3 more sources

Polypept(o)ide-Based Core-Shell Bottlebrush Polymers: A Versatile Platform for Drug Encapsulation. [PDF]

Macromol Biosci
This study developed polypept(o)ide‐based core–shell brushes (CSBs) with tunable sizes (Rh: 17–70 nm) for hydrophobic drug delivery. CSBs achieved 10% dasatinib loading through π–π interactions, enabling sustained release over 72 h. Notably, CSB‐dasatinib complexes showed comparable cell viability reduction to the free drug in U‐87 MG cells ...
Zhao B, Wei J, Berger R, Jian L, Koynov K, Zhang H, Barz M.   +6 more
europepmc   +2 more sources

Four quasars above redshift 6 discovered by the Canada-France High-z Quasar Survey [PDF]

, 2007
The Canada-France High-z Quasar Survey (CFHQS) is an optical survey designed to locate quasars during the epoch of reionization. In this paper we present the discovery of the first four CFHQS quasars at redshift greater than 6, including the most distant
Alain Omont, Alexandre Beelen, Alvarez M. A., Bolton J. S., Chris J. Willott, Céline Reylé, David Crampton, David Schade, Elias J. H., Gary J. Hill, Jacqueline Bergeron, John B. Hutchings, King A. R., Loic Albert, Luc Simard, Marcin Sawicki, Michael Gully-Santiago, Philippe Delorme, Phillip Vinten, Pierre Cox, Ryan-Weber E. V., Thierry Forveille, Xavier Delfosse   +22 more
core   +6 more sources

On-axis spectroscopy of the host galaxies of 20 optically luminous quasars at z~0.3 [PDF]

, 2006
We present the analysis of a sample of 20 bright low-redshift quasars ...
Courbin, F., Jablonka, P., Jahnke, K., Letawe, G., Magain, P., Meylan, G., Wisotzki, L.   +6 more
core   +4 more sources

Multi-object spectroscopy of the field surrounding PKS 2126-158: Discovery of a z=0.66 galaxy group [PDF]

, 2006
The high-redshift radio-loud quasar PKS 2126-158 is found to have a large number of red galaxies in close apparent proximity. We use the Gemini Multi-Object Spectrograph (GMOS) on Gemini South to obtain optical spectra for a large fraction of these ...
Francis, Paul J., Webster, Rachel L., Whiting, Matthew T.   +2 more
core   +1 more source

Diagnostics of Quasar Broad Absorption Line Geometry: X-Ray Observations and Two-dimensional Optical Spectroscopy

The Astrophysical Journal, 2005
A new generation of sensitive X-ray measurements are indicating that the existence of X-ray attenuation column densities, NH > 1024 cm-2, is quite common among broad absorption line quasars (BALQSOs). This is significant to the geometry of the broad absorption line (BAL) outflow.
Sebastian Lipari, B. Punsly
openaire   +2 more sources

SDSS J1254+0846: A Binary Quasar Caught in the Act of Merging [PDF]

, 2010
We present the first luminous, spatially resolved binary quasar that clearly inhabits an ongoing galaxy merger. SDSS J125455.09+084653.9 and SDSS J125454.87+084652.1 (SDSS J1254+0846 hereafter) are two luminous z=0.44 radio quiet quasars, with a radial ...
Adam D. Myers, Aoki, Bahcall, Bennert, Bennert, Bennert, Bertin, Bogdanović, Cheung, Chornock, Comerford, Comerford, Condon, Cox, Cui, Decarli, de Vaucouleurs, Djorgovski, Dotti, Escala, Ferrarese, Foreman, Gallagher, Gebhardt, Granato, Green, Green, Green, Guyon, Hennawi, Hopkins, Hopkins, Ivezić, John S. Mulchaey, Jonsson, Kaspi, Kaspi, Keeton, Khochfar, Kim, Kochanek, Komossa, Komossa, Komossa, Kormendy, Kurtz, Lauer, Liu, Madau, Masters, Milosavljević, Milosavljević, Motta, Myers, Myers, Oguri, Paul J. Green, Peng, Peterson, Richards, Richards, Richstone, Schmitt, Shen, Shen, Shields, Silverman, Smith, Steffen, Strateva, Sérsic, Tang, Thomas J. Cox, Thomas L. Aldcroft, Urrutia, Valtonen, Vardha N. Bennert, Veilleux, Veilleux, Veilleux, Veilleux, Vestergaard, Volonteri, Wandel, Wayne A. Barkhouse, White, Wild, Wilhite, Wilms, Wisotzki, Wolf, Wrobel, Wyithe, Wyithe, Wyithe, Yan, Zezas   +96 more
core   +3 more sources

Integral field spectroscopy of four lensed quasars: analysis of their neighborhood and evidence for microlensing [PDF]

, 2008
CONTEXT: Gravitationally lensed quasars constitute an independent tool to derive H0 through time-delays; they offer as well the opportunity to study the mass distribution and interstellar medium of their lensing galaxies and, through microlensing they ...
A. Yonehara, Abajas, Angonin, Bade, Bade, Blandford, Blandford, Bohlin, Bradac, Burud, C. Faure, Cardelli, Chae, Chang, Chartas, Covone, D. Alloin, Eigenbrod, Falco, Faure, G. Covone, Gil-Merino, Gordon, Hutsemekers, Hutsemekers, J. Wambsganss, J.-P. Kneib, Jean, Kaspi, Kayser, Kinney, Kneib, Kneib, Kochanek, Lewis, Magain, Meneghetti, Mineshige, Myers, Mörtsell, Nadeau, Oguri, Ostensen, Peterson, Refsdal, Reichard, Rusin, Schechter, Schneider, Scodeggio, Shakura, T. Anguita, Turnshek, Wambsganss, Wambsganss, Wisotzki, Wisotzki, Wucknitz, Yonehara, Yonehara, Yonehara, Zanichelli   +61 more
core   +2 more sources

A Balmer-line Broad Absorption Line Quasar [PDF]

, 2006
I report the discovery of blueshifted broad absorption line (BAL) troughs in at least six transitions of the Balmer series of hydrogen (Hbeta to H9) and in CaII, MgII and excited FeII in the quasar SDSS J125942.80+121312.6. This is only the fourth active
Hall, Patrick B.
core   +2 more sources