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Articles 31 - 38 of 38
Full-Text Articles in Physical Sciences and Mathematics
Large Area Survey For Z=7 Galaxies In Sdf And Goods-N: Implications For Galaxy Formation And Cosmic Reionization, Masami Ouchi, Bahram Mobasher, Kazuhiro Shimasaku, Henry C. Ferguson, S. Michael Fall, Yoshiaki Ono, Nobunari Kashikawa, Tomoki Morokuma, Kimihiko Nakajima, Sadanori Okamura, Mark Dickinson, Mauro Giavalisco, Kouji Ohta
Large Area Survey For Z=7 Galaxies In Sdf And Goods-N: Implications For Galaxy Formation And Cosmic Reionization, Masami Ouchi, Bahram Mobasher, Kazuhiro Shimasaku, Henry C. Ferguson, S. Michael Fall, Yoshiaki Ono, Nobunari Kashikawa, Tomoki Morokuma, Kimihiko Nakajima, Sadanori Okamura, Mark Dickinson, Mauro Giavalisco, Kouji Ohta
Mauro Giavalisco
We present results of our large-area survey for z'-band dropout galaxies at z=7 in a 1568 arcmin^2 sky area covering the SDF and GOODS-N fields. Combining our ultra-deep Subaru/Suprime-Cam z'- and y-band (lambda_eff=1um) images with legacy data of Subaru and HST, we have identified 22 bright z-dropout galaxies down to y=26, one of which has a spectroscopic redshift of z=6.96 determined from Lya emission. The z=7 luminosity function (LF) yields the best-fit Schechter parameters of phi*=0.69 +2.62/-0.55 x10^(-3) Mpc^(-3), Muv*=-20.10 +/-0.76 mag, and alpha=-1.72 +/-0.65, and indicates a decrease from z=6 at a >95% confidence level. This decrease is beyond …
The Udf05 Follow-Up Of The Hubble Ultra Deep Field. Iii. The Luminosity Function At Z~6, Jian Su, Massimo Stiavelli, Pascal Oesch, Michele Trenti, Eddie Bergeron, Larry Bradley, Marcella Carollo, Tomas Dahlen, Henry C. Ferguson, Mauro Giavalisco, Anton Koekemoer, Simon Lilly, Ray A. Lucas, Bahram Mobasher, Nino Panagia, Cheryl Pavlovsky
The Udf05 Follow-Up Of The Hubble Ultra Deep Field. Iii. The Luminosity Function At Z~6, Jian Su, Massimo Stiavelli, Pascal Oesch, Michele Trenti, Eddie Bergeron, Larry Bradley, Marcella Carollo, Tomas Dahlen, Henry C. Ferguson, Mauro Giavalisco, Anton Koekemoer, Simon Lilly, Ray A. Lucas, Bahram Mobasher, Nino Panagia, Cheryl Pavlovsky
Mauro Giavalisco
In this paper, we present a derivation of the rest-frame 1400A luminosity function (LF) at redshift six from a new application of the maximum likelihood method by exploring the five deepest HST/ACS fields, i.e., the HUDF, two UDF05 fields, and two GOODS fields. We work on the latest improved data products, which makes our results more robust than those of previous studies. We use un-binned data and thereby make optimal use of the information contained in the dataset. We focus on the analysis to a magnitude limit where the completeness is larger than 50% to avoid possibly large errors in …
The Evolution Of The Galaxy Rest-Frame Ultraviolet Luminosity Function Over The First Two Billion Years, Steven L. Finkelstein, Russell E. Ryan Jr., Casey Papovich, Mark Dickinson, Mimi Song, Rachel Somerville, Herny C. Ferguson, Brett Salmon, Mauro Giavalisco, Anton M. Koekemoer, Matthew L. N. Ashby, Peter Behroozi, Marco Castellano, James S. Dunlop, Sandy M. Faber, Giovanni G. Fazio, Adriano Fontana, Norman A. Grogin, Nimish Hathi, Jason Jaacks, Dale D. Kocevski, Rachel Livermore, Ross J. Mclure, Emiliano Merlin, Bahram Mobasher, Jeffrey A. Newman, Marc Rafelski, Vithal Tilvi, S.P. Willner
The Evolution Of The Galaxy Rest-Frame Ultraviolet Luminosity Function Over The First Two Billion Years, Steven L. Finkelstein, Russell E. Ryan Jr., Casey Papovich, Mark Dickinson, Mimi Song, Rachel Somerville, Herny C. Ferguson, Brett Salmon, Mauro Giavalisco, Anton M. Koekemoer, Matthew L. N. Ashby, Peter Behroozi, Marco Castellano, James S. Dunlop, Sandy M. Faber, Giovanni G. Fazio, Adriano Fontana, Norman A. Grogin, Nimish Hathi, Jason Jaacks, Dale D. Kocevski, Rachel Livermore, Ross J. Mclure, Emiliano Merlin, Bahram Mobasher, Jeffrey A. Newman, Marc Rafelski, Vithal Tilvi, S.P. Willner
Mauro Giavalisco
No abstract provided.
Deep U Band And R Imaging Of Goods-South: Observations,Data Reduction And First Results, M. Nonino, M. Dickinson, P. Rosati, A. Grazian, N. Reddy, S. Cristiani, Mauro Giavalisco, H. Kuntschner, E. Vanzella, E. Daddi, C. Cesarsky
Deep U Band And R Imaging Of Goods-South: Observations,Data Reduction And First Results, M. Nonino, M. Dickinson, P. Rosati, A. Grazian, N. Reddy, S. Cristiani, Mauro Giavalisco, H. Kuntschner, E. Vanzella, E. Daddi, C. Cesarsky
Mauro Giavalisco
We present deep imaging in the {\em U} band covering an area of 630 arcmin$^{2}$ centered on the southern field of the Great Observatories Origins Deep Survey (GOODS). The data were obtained with the VIMOS instrument at the ESO Very Large Telescope. The final images reach a magnitude limit $U_{lim} \approx 29.8$ (AB, 1$\sigma$, in a 1\arcsec radius aperture), and have good image quality, with full width at half maximum $\approx 0.8\arcsec$. They are significantly deeper than previous U--band images available for the GOODS fields, and better match the sensitivity of other multi--wavelength GOODS photometry. The deeper U--band data yield …
Uv Continuum Slope And Dust Obscuration From Z~6 To Z~2: The Star Formation Rate Density At High Redshift, R. J. Bouwens, G. D. Illingworth, M. Franx, R.-R. Chary, G. R. Meurer, C. J. Conselice, H. Ford, Mauro Giavalisco, P. Van Dokkum
Uv Continuum Slope And Dust Obscuration From Z~6 To Z~2: The Star Formation Rate Density At High Redshift, R. J. Bouwens, G. D. Illingworth, M. Franx, R.-R. Chary, G. R. Meurer, C. J. Conselice, H. Ford, Mauro Giavalisco, P. Van Dokkum
Mauro Giavalisco
We provide a systematic measurement of the rest-frame UV continuum slope beta over a wide range in redshift (z~2-6) and rest-frame UV luminosity (0.1-2L*) to improve estimates of the SFR density at high redshift. We utilize the deep optical and infrared data (ACS/NICMOS) over the CDF-S and HDF-N GOODS fields, as well as the UDF for our primary UBVi "dropout" sample. We correct the observed distributions for selection biases and photometric scatter. We find that the UV-continuum slope of the most luminous galaxies is substantially redder at z~2-4 than it is at z~5-6. Lower luminosity galaxies are also found to …
Biases And Uncertainties In Physical Parameter Estimates Of Lyman Break Galaxies From Broad-Band Photometry, Seong-Kook Lee, Rafal Idzi, Henry C. Ferguson, Rachel S. Somerville, Tommy Wiklind, Mauro Giavalisco
Biases And Uncertainties In Physical Parameter Estimates Of Lyman Break Galaxies From Broad-Band Photometry, Seong-Kook Lee, Rafal Idzi, Henry C. Ferguson, Rachel S. Somerville, Tommy Wiklind, Mauro Giavalisco
Mauro Giavalisco
We investigate the biases and uncertainties in estimates of physical parameters of high-redshift Lyman break galaxies (LBGs), such as stellar mass, mean stellar population age, and star formation rate (SFR), obtained from broad-band photometry. By combining LCDM hierarchical structure formation theory, semi-analytic treatments of baryonic physics, and stellar population synthesis models, we construct model galaxy catalogs from which we select LBGs at redshifts z ~ 3.4, 4.0, and 5.0. The broad-band spectral energy distributions (SEDs) of these model LBGs are then analysed by fitting galaxy template SEDs derived from stellar population synthesis models with smoothly declining SFRs. We compare the …
Goods-Herschel Measurements Of The Dust Attenuation Of Typical Star-Forming Galaxies At High Redshift: Observations Of Uv-Selected Galaxies At Z~2, N. Reddy, M. Dickinson, D. Elbaz, G. Morrison, Mauro Giavalisco, R. Ivison, C. Papovich, D. Scott, V. Buat, D. Burgarella, V. Charmandaris, E. Daddi, G. Magdis, E. Murphy, B. Altieri, H. Aussel, H. Dannerbauer, K. Dasyra, H. S. Hwang, J. Kartaltepe, R. Leiton, B. Magnelli, P. Popesso
Goods-Herschel Measurements Of The Dust Attenuation Of Typical Star-Forming Galaxies At High Redshift: Observations Of Uv-Selected Galaxies At Z~2, N. Reddy, M. Dickinson, D. Elbaz, G. Morrison, Mauro Giavalisco, R. Ivison, C. Papovich, D. Scott, V. Buat, D. Burgarella, V. Charmandaris, E. Daddi, G. Magdis, E. Murphy, B. Altieri, H. Aussel, H. Dannerbauer, K. Dasyra, H. S. Hwang, J. Kartaltepe, R. Leiton, B. Magnelli, P. Popesso
Mauro Giavalisco
We take advantage of the sensitivity and resolution of Herschel at 100 and 160 micron to directly image the thermal dust emission and investigate the infrared luminosities, L(IR), and dust obscuration of typical star-forming (L*) galaxies at high redshift. Our sample consists of 146 UV-selected galaxies with spectroscopic redshifts 1.51e10 Lsun at z~2 are luminous infrared galaxies (LIRGs) with a median L(IR)=(2.2+/-0.3)e11 Lsun. Typical galaxies at 1.5
Smooth(Er) Stellar Mass Maps In Candels: Constraints On The Longevity Of Clumps In High-Redshift Star-Forming Galaxies, Stijn Wuyts, Natascha M. Förster Schreiber, Reinhard Genzel, Yicheng Guo, Guillermo Barro, Eric F. Bell, Avishai Dekel, Sandra M. Faber, Henry C. Ferguson, Mauro Giavalisco, Norman A. Grogin, Nimish P. Hathi, Kuang-Han Huang, Dale D. Kocevski, Anton M. Koekemoer, David C. Koo, Jennifer Lotz, Dieter Lutz, Elizabeth Mcgrath, Jeffrey A, Newman, David Rosario, Amelie Saintonge, Linda J. Tacconi, Benjamin J. Weiner, Arjen Van Der Wel
Smooth(Er) Stellar Mass Maps In Candels: Constraints On The Longevity Of Clumps In High-Redshift Star-Forming Galaxies, Stijn Wuyts, Natascha M. Förster Schreiber, Reinhard Genzel, Yicheng Guo, Guillermo Barro, Eric F. Bell, Avishai Dekel, Sandra M. Faber, Henry C. Ferguson, Mauro Giavalisco, Norman A. Grogin, Nimish P. Hathi, Kuang-Han Huang, Dale D. Kocevski, Anton M. Koekemoer, David C. Koo, Jennifer Lotz, Dieter Lutz, Elizabeth Mcgrath, Jeffrey A, Newman, David Rosario, Amelie Saintonge, Linda J. Tacconi, Benjamin J. Weiner, Arjen Van Der Wel
Mauro Giavalisco
We perform a detailed analysis of the resolved colors and stellar populations of a complete sample of 323 star-forming galaxies at 0.5 < z < 1.5, and 326 star-forming galaxies at 1.5 < z < 2.5 in the ERS and CANDELS-Deep region of GOODS-South. Galaxies were selected to be more massive than 10^10 Msun and have specific star formation rates above 1/t_H. We model the 7-band optical ACS + near-IR WFC3 spectral energy distributions of individual bins of pixels, accounting simultaneously for the galaxy-integrated photometric constraints available over a longer wavelength range. We analyze variations in rest-frame color, stellar surface mass density, age, and extinction as a function of galactocentric radius and local surface brightness/density, and measure structural parameters on luminosity and stellar mass maps. We find evidence for redder colors, older stellar ages, and increased dust extinction in the nuclei of galaxies. Big star-forming clumps seen in star formation tracers are less prominent or even invisible on the inferred stellar mass distributions. Off-center clumps contribute up to ~20% to the integrated SFR, but only 7% or less to the integrated mass of all massive star-forming galaxies at z ~ 1 and z ~ 2, with the fractional contributions being a decreasing function of wavelength used to select the clumps. The stellar mass profiles tend to have smaller sizes and M20 coefficients, and higher concentration and Gini coefficients than the light distribution. Our results are consistent with an inside-out disk growth scenario with brief (100 - 200 Myr) episodic local enhancements in star formation superposed on the underlying disk. Alternatively, the young ages of off-center clumps may signal inward clump migration, provided this happens efficiently on the order of an orbital timescale.