Results 31 to 40 of about 141,253 (114)

Optical polarimetry studies of Seyfert galaxies [PDF]

, 1999
Optical imaging polarimetry has been performed on seven nearby Seyfert galaxies, three with face-on and four with edge-on host galaxies of various morphological classifications.
Felton, Michelle Ann
core  

Using Lyα Absorption to Measure the Intensity and Variability of z ∼ 2.4 Ultraviolet Background Light

The Astrophysical Journal
We present measurements of z  ∼ 2.4 ultraviolet (UV) background light using Ly α absorption from galaxies at z  ∼ 2–3 in the Hobby–Eberly Telescope Dark Energy Experiment (HETDEX) database.
Laurel H. Weiss, Karl Gebhardt, Dustin Davis, Erin Mentuch Cooper, Maja Lujan Niemeyer, Mahdi Qezlou, Mahan Mirza Khanlari, Robin Ciardullo, Daniel Farrow, Eric Gawiser, Simon Gazagnes, Caryl Gronwall, Gary J. Hill, Donald P. Schneider   +13 more
doaj   +1 more source

A Cosmic Archipelago of lensed metal-poor galaxies at z ∼ 6

Astronomy & Astrophysics
The Cosmic Archipelago is an ensemble of galaxies, strongly lensed by the Hubble Frontier Fields cluster MACS J0416, displaying some of the most extreme physical properties known at z ~ 6.14.
Bolamperti A., Messa M., Zanella A., Vanzella E., Bergamini P., Loiacono F., Koekemoer A. M., Vernet J., Windhorst R. A., Adamo A., Annibali F., Calura F., Castellano M., Diego J. M., Grillo C., Gronke M., Iani E., Meneghetti M., Mercurio A., Nakajima K., Ravindranath S., Ricotti M., Rosati P., Yan H.   +23 more
doaj   +1 more source

DIFFUSE Lyα EMITTING HALOS: A GENERIC PROPERTY OF HIGH-REDSHIFT STAR-FORMING GALAXIES [PDF]

, 2011
Using a sample of 92 UV continuum-selected, spectroscopically identified galaxies with langzrang = 2.65, all of which have been imaged in the Lyα line with extremely deep narrow-band imaging, we examine galaxy Lyα emission profiles to very faint surface ...
Kollmeier, Juna A., Shapley, Alice E., Naveen A. Reddy, Alice E. Shapley, Bogosavljević, Milan, Erb, Dawn K., Juna A. Kollmeier, Max Pettini, Milan Bogosavljević, Steidel, Charles C., Pettini, Max, Dawn K. Erb, Reddy, Naveen A., Charles C. Steidel   +13 more
core   +1 more source

Extreme equivalent-width-selected low-mass starbursts at z = 4 − 9: Insights into their role in cosmic reionization

Astronomy & Astrophysics
We investigate the properties of extreme emission line galaxies (EELGs) at z = 4 − 9 and their role in reionization. Compact, low-mass galaxies with intense optical emission lines are linked to elevated specific star formation rates (sSFRs) and recent ...
Llerena M., Pentericci L., Amorín R., Ferrara A., Dickinson M., Arevalo-Gonzalez F., Calabrò A., Napolitano L., Mascia S., Arrabal Haro P., Begley R., Cleri N. J., Davis K., Hu W., Kartaltepe J. S., Koekemoer A. M., Lucas R. A., McGrath E., McLeod D. J., Papovich C., Stanton T. M., Taylor A. J., Tripodi R., Wang X., Yung L. Y. A.   +24 more
doaj   +1 more source

The Lyα Reference Sample. XIV. Lyα Imaging of 45 Low-redshift Star-forming Galaxies and Inferences on Global Emission

The Astrophysical Journal Supplement Series, 2023
We present Ly α imaging of 45 low-redshift star-forming galaxies observed with the Hubble Space Telescope. The galaxies have been selected to have moderate to high star formation rates (SFRs) using far-ultraviolet (FUV) luminosity and H α equivalent ...
Jens Melinder, Göran Östlin, Matthew Hayes, Armin Rasekh, J. Miguel Mas-Hesse, John M. Cannon, Daniel Kunth, Peter Laursen, Axel Runnholm, E. Christian Herenz, Matteo Messa, Daniel Schaerer, Anne Verhamme, T. Emil Rivera-Thorsen, Lucia Guaita, Thomas Marquart, Johannes Puschnig, Alexandra Le Reste, Andreas Sandberg, Emily Freeland, Joanna Bridge   +20 more
doaj   +1 more source

MAMMOTH-Subaru. IV. Large Scale Structure and Clustering Analysis of Lyα Emitters and Lyα Blobs at z = 2.2–2.3

The Astrophysical Journal
We report the large scale structure and clustering analysis of Ly α emitters (LAEs) and Ly α blobs (LABs) at z  = 2.2–2.3. Using 3341 LAEs, 117 LABs, and 58 bright (Ly α luminosity L _Ly _α  > 10 ^43.4 erg s ^−1 ) LABs at z  = 2.2–2.3 selected with ...
Haibin Zhang, Zheng Cai, Mingyu Li, Yongming Liang, Nobunari Kashikawa, Ke Ma, Yunjing Wu, Qiong Li, Sean D. Johnson, Satoshi Kikuta, Masami Ouchi, Xiaohui Fan, Yuanhang Ning   +12 more
doaj   +1 more source

Resolving dust and Lyman α emission in a lensed galaxy at the epoch of reionization with JWST/CANUCS

Astronomy & Astrophysics
Context. Lyman α (Lyα) emission is highly sensitive to dust and neutral hydrogen and is believed to be suppressed in dusty or hydrogen-rich galaxies – especially during the epoch of reionization (EoR).
Markov V., Bradač M., Estrada-Carpenter V., Desprez G., Rihtaršič G., Judež J., Tripodi R., Sawicki M., Noirot G., Martis N., Willott C., Abraham R., Asada Y., Brammer G., Matharu J., Muzzin A., Sarrouh G. T. E., Withers S., Ferrara A., Fujimoto S., Gallerani S., Goovaerts I., Harshan A.   +22 more
doaj   +1 more source

Secondary evolution of galaxies investigated by N-body simulations [PDF]

, 2008
In the ΛCDM cosmology, merging is one of the most important physical processes that drives the formation and evolution of galaxies. In the present work, we use N-body techniques to investigate some of currently open issues related to the formation and ...
Coppola, Giuseppina
core   +1 more source

The Lyα Dependence on Nebular Properties from the HETDEX and MOSDEF Surveys

The Astrophysical Journal
Investigating the impact of galaxy properties on emergent Ly α emission is crucial for reionization studies, given the sensitivity of Ly α to neutral hydrogen.
Óscar A. Chávez Ortiz, Gene C. K. Leung, Steven L. Finkelstein, Dustin Davis, Ralph S. Sutherland, David C. Nicholls, Mabel Stephenson, Erin Mentuch Cooper, Micaela Bagley, Karl Gebhardt, Lindsay R. House, Chenxu Liu, Robin Ciardullo, Caryl Gronwall, Gary J. Hill, Daniel Farrow, Donald P. Schneider   +16 more
doaj   +1 more source