Results 81 to 90 of about 113,123 (219)

Physical properties of z~4 LBGs: differences between galaxies with and without Ly-alpha emission

, 2007
We have analysed the physical properties of z~4 Lyman Break Galaxies observed in the GOODS-S survey, in order to investigate the possible differences between galaxies where the Ly-alpha is present in emission, and those where the line is absent or in ...
A. Fontana, A. Grazian, Bouwens, Bruzual, C. De Santis, Cowie, Dickinson, Dickinson, Drory, E. Giallongo, Fontana, Fontana, Fontana, Fujita, Gawiser, Giavalisco, Grazian, Grazian, Hansen, Iwata, Iye, Kashikawa, Keel, L. Pentericci, Lai, Le Fevre, Leitherer, Madau, Malhotra, Mori, Ouchi, Ouchi, P. Santini, Papovich, Rhoads, S. Gallozzi, S. Salimbeni, Shapley, Shapley, Steidel, Steidel, Steidel, Tapken, Thommes, Vanzella, Vanzella, Venemans, Venemans   +47 more
core   +1 more source

HST EMISSION LINE GALAXIES AT z ∼ 2: COMPARING PHYSICAL PROPERTIES OF LYMAN ALPHA AND OPTICAL EMISSION LINE SELECTED GALAXIES [PDF]

The Astrophysical Journal, 2016
ABSTRACTWe compare the physical and morphological properties ofz ∼ 2 Lyαemitting galaxies (LAEs) identified in the HETDEX Pilot Survey and narrow band studies with those ofz ∼ 2 optical emission line selected galaxies (oELGs) identified viaHSTWFC3 infrared grism spectroscopy.
Hagen, Alex, Zeimann, Gregory R., Behrens, Christoph, Ciardullo, Robin, Grasshorn Gebhardt, Henry S., Gronwall, Caryl, Bridge, Joanna S., Fox, Derek B., Derek B., Fox, Schneider, Donald P., Trump, Jonathan R., Blanc Mendiberri, Guillermo, Chiang, Yi-Kuan, Chonis, Taylor S., Finkelstein, Steven L., Hill, Gary J., Shardha, Jogee, Eric, Gawiser   +17 more
openaire   +4 more sources

Highly Efficient Identification of Extreme Emission-line Galaxies in the Local Universe: >8000 New Green Pea Candidates at 0.12 < z < 0.36

The Astrophysical Journal Supplement Series
The currently known compact extreme emission-line galaxies (the “Green Peas” (GPs)) in the Sloan Digital Sky Survey (SDSS) are rare and were mostly found among serendipitous spectroscopic targets, thus leaving open the possibility that a substantial ...
Heather Samonski, Samir Salim, John J. Salzer   +2 more
doaj   +1 more source

Gone with the heat: a fundamental constraint on the imaging of dust and molecular gas in the early Universe [PDF]

Royal Society Open Science, 2016
Images of dust continuum and carbon monoxide (CO) line emission are powerful tools for deducing structural characteristics of galaxies, such as disc sizes, H2 gas velocity fields and enclosed H2 and dynamical masses. We report on a fundamental constraint
Zhi-Yu Zhang, Padelis P. Papadopoulos, R. J. Ivison, Maud Galametz, M. W. L. Smith, Emmanuel M. Xilouris   +5 more
doaj   +1 more source

The Taurus Tunable Filter Field Galaxy Survey: Sample Selection and Narrowband Number-Counts [PDF]

, 2001
Recent evidence suggests a falling volume-averaged star-formation rate (SFR) over z ~ 1. It is not clear, however, the extent to which the selection of such samples influences the measurement of this quantity.
Bland-Hawthorn J., Bland-Hawthorn J., Boyle B. J., Broadhurst T. J., Colless M., Colless M., D. Heath Jones, Ellis R. S., Glazebrook K., Heyl J. S., Joss Bland‐Hawthorn, Lissberger P. H., Metcalfe N., Peterson B. A., Tresse L.   +14 more
core   +2 more sources

Survey on AI‐Enabled Computer Vision Technologies and Applications for Space Robotic Missions

Journal of Field Robotics, EarlyView.
ABSTRACT This survey provides a comprehensive overview of recent advancements and challenges in Artificial Intelligence (AI)‐enabled computer vision (CV) techniques for space robotic missions, spanning critical phases such as Entry, Descent, and Landing (EDL), orbital operations, and planetary surface exploration.
Maciej Quoos, Steven Kay, Julia Wajoras, Robert Field, Evridiki V. Ntagiou, Fakher Mohammad, Yang Gao   +6 more
wiley   +1 more source

Machine-learning Classifiers for Intermediate Redshift Emission-line Galaxies [PDF]

The Astrophysical Journal, 2019
Abstract Classification of intermediate redshift (z = 0.3–0.8) emission line galaxies as star-forming galaxies, composite galaxies, active galactic nuclei (AGNs), or low-ionization nuclear emission regions (LINERs) using optical spectra alone was impossible because the lines used for standard optical diagnostic diagrams: [N ii], Hα, and [
Kai Zhang, David J. Schlegel, Brett H. Andrews, Johan Comparat, Christoph Schäfer, Jose Antonio Vazquez Mata, Jean-Paul Kneib, Renbin Yan   +7 more
openaire   +6 more sources

Green Peas in the Southern Sky: Broadband Color Selection and Spectroscopic Follow-up

The Astrophysical Journal
We present a systematic search for 1696 green pea (GP) galaxy candidates in the southern hemisphere selected from the Dark Energy Survey Data Release 2 and provide preliminary results from spectroscopic follow-up observations of 26 targets chosen among ...
Yejin Jeong, Hyunjin Shim, Eunchong Kim, Jeong Hwan Lee   +3 more
doaj   +1 more source

Near-infrared spectroscopy of a large sample of low-metallicity blue compact dwarf galaxies

, 2015
We present near-infrared (NIR) spectroscopic observations in the wavelength range 0.90-2.40mum of eighteen low-metallicity blue compact dwarf (BCD) galaxies and six HII regions in spiral and interacting galaxies.
Izotov, Y. I., Thuan, T. X.
core   +1 more source

Metallicities of Emission-Line Galaxies from HST ACS PEARS and HST WFC3 ERS Grism Spectroscopy at 0.6 < z < 2.4 [PDF]

, 2012
Galaxies selected on the basis of their emission line strength show low metallicities, regardless of their redshifts. We conclude this from a sample of faint galaxies at redshifts between 0.6 < z < 2.4, selected by their prominent emission lines in low ...
Cohen, Seth, Finkelstein, Steven, Kuntschner, Harald, Kümmel, Martin, Malhotra, Sangeeta, O'Connell, Robert, Pirzkal, Nor, Rhoads, James, Straughn, Amber, Walsh, Jeremy, Windhorst, Rogier A., Xia, Lifang   +11 more
core   +3 more sources