A5040050569- Astronomy and Astrophysical Research
- Galaxies: Formation, Evolution, Phenomena
- Stellar, planetary, and galactic studies
- Gamma-ray bursts and supernovae
- Astrophysics and Star Formation Studies
- Astrophysical Phenomena and Observations
- Astronomical Observations and Instrumentation
- Radio Astronomy Observations and Technology
- Scientific Research and Discoveries
- Astrophysics and Cosmic Phenomena
- Calibration and Measurement Techniques
- Astro and Planetary Science
- Planetary Science and Exploration
- Spacecraft and Cryogenic Technologies
- Remote Sensing in Agriculture
- Geophysics and Gravity Measurements
- Optics and Image Analysis
- Atmospheric and Environmental Gas Dynamics
- Space Exploration and Technology
- Economic Growth and Productivity
- Advanced Vision and Imaging
- Isotope Analysis in Ecology
- Crystal Structures and Properties
- Advanced Image Processing Techniques
- Plant Water Relations and Carbon Dynamics
Jet Propulsion Laboratory
2012-2024
National Aeronautics and Space Administration
2023
W.M. Keck Observatory
2018-2020
California Institute of Technology
2013-2018
Infrared Processing and Analysis Center
2015-2018
University of California, Riverside
2010-2017
Trinity House
2014
Johns Hopkins University
2007-2012
University of California, Davis
2012
University of California, Berkeley
2011
Aims. We present the full data set of spectroscopic campaign ESO/GOODS program in GOODS-South field, obtained with FORS2 spectrograph at ESO/VLT. Method. Objects were selected as candidates for VLT/FORS2 observations primarily based on expectation that detection and measurement their spectral features would benefit from high throughput resolution FORS2. The reliability redshift estimates is assessed using redshift-magnitude color-redshift diagrams, comparing results public data. Results....
We present the full data set of VIMOS spectroscopic campaign ESO/GOODS program in CDFS, which complements FORS2 campaign. The GOODS/VIMOS is structured two separate surveys using different grisms. Low Resolution Blue (LR-Blue) and Medium (MR) orange grisms have been used to cover redshift ranges. LR-Blue aimed at observing galaxies mainly 1.8<z<3.5, while MR aims z<1 Lyman Break Galaxies (LBGs) z>3.5. consists 20 masks. This release adds 8 new masks previous (12 masks, Popesso et al. 2009)....
We evaluate the effects of environment and stellar mass on galaxy properties at 0.85 < z 1.20 using a 3.6um-selected spectroscopic sample 797 cluster field galaxies drawn from GCLASS survey. confirm that for with LogM* > 9.3 well-known correlations between such as star-forming fraction (f_SF), SFR, SSFR, D(4000), color are already in place ~ 1. separate by comparing quiescent fixed environment, mass. The SSFR is correlated mass; however, it independent environment. same trend exists D(4000)...
ABSTRACT We study the effects of local environment and stellar mass on galaxy properties using a complete sample quiescent star-forming systems in COSMOS field at <?CDATA $z\lesssim 3$?> . show that 1$?> median star formation rate (SFR) specific SFR (sSFR) all galaxies depend environment, but they become independent z ≳ 1. However, we find only for galaxies, sSFR are similar different environments regardless redshift mass. fraction depends ≲ 1 out to ∼ 3. faster denser overall environmental...
We present the results of a comprehensive Spitzer survey 69 radio galaxies across 1 < z 5.2. Using IRAC (3.6-8.0 μm), IRS (16 and MIPS (24-160 μm) imaging, we decompose rest-frame optical to infrared spectral energy distributions into stellar, AGN, dust components determine contribution host galaxy stellar emission at H band. Stellar masses derived from near-IR data, where AGN young star contributions are minimized, significantly more reliable than those UV data. find that fraction emitted...
Strong size and internal density evolution of early-type galaxies between z~2 the present has been reported by several authors. Here we analyze samples nearby distant (z~1) with dynamically measured masses in order to confirm previous, model-dependent results constrain uncertainties that may play a role. Velocity dispersion measurements are taken from literature for 50 morphologically selected 0.8
We report the first results from Clusters Around Radio-Loud AGN (CARLA) program, a Cycle 7 and 8 Spitzer Space Telescope snapshot program to investigate environments of large sample obscured unobscured luminous radio-loud at 1.2 < z 3.2. These data, obtained for 387 fields, reach 3.6 4.5 um depths [3.6] (AB) = 22.6 [4.5] 22.9 95% completeness level, which is two three times fainter than L* in this redshift range. By using color cut [3.6]-[4.5] > -0.1 (AB), efficiently selects high-redshift...
Aims.We present the second campaign of ESO/GOODS program spectroscopy faint galaxies in GOODS-South field.
We present the first results of ESO/GOODS program spectroscopy faint galaxies in Chandra Deep Field South (CDF-S). 399 spectra 303 unique targets have been obtained service mode with FORS2 spectrograph at ESO/VLT, providing 234 redshift determinations (the median distribution is 1.04). The typical uncertainty estimated to be . Galaxies color selected a way that resulting typically spans from 2. reduced and derived redshifts are released community through ESO web page...
Using new and published data, we construct a sample of 160 brightest cluster galaxies (BCGs) spanning the redshift interval 0.03 < z 1.63. We use this sample, which covers 70% history universe, to measure growth in stellar mass BCGs after correcting for correlation between BCG it lives. find that increase by factor 1.8 z=0.9 z=0.2. Compared earlier works, our result is closer predictions semi-analytic models. However, at z=0.9, relative z=0.2, are still 1.5 more massive than these Star...
We present the Spitzer Extragalactic Representative Volume Survey (SERVS), an 18 deg2 medium-deep survey at 3.6 and 4.5 μm with postcryogenic Space Telescope to ≈2 μJy (AB = 23.1) depth of five highly observed astronomical fields (ELAIS-N1, ELAIS-S1, Lockman Hole, Chandra Deep Field South, XMM-LSS). SERVS is designed enable study galaxy evolution as a function environment from z ∼ 5 day first extragalactic that both large enough deep put rare objects such luminous quasars clusters ≳ 1 into...
We present the stellar mass functions (SMFs) of star-forming and quiescent galaxies from observations 10 rich clusters in Gemini Cluster Astrophysics Spectroscopic Survey (GCLASS) redshift range 0.86<z<1.34. compare our results with field measurements at similar redshifts using data a Ks-band selected catalogue COSMOS/UltraVISTA field. construct multi-colour for 11 photometric bands covering u-8um, estimate masses SED fitting techniques. To correct interlopers cluster sample, we use deep...
We present a new two-color algorithm, the "Stellar Bump Sequence" (SBS), that is optimized for robustly identifying candidate high-redshift galaxy clusters in combined wide-field optical and mid-infrared (MIR) data. The SBS algorithm fusion of well-tested cluster red-sequence method Gladders & Yee (2000) with MIR 3.6um - 4.5um detection developed by Papovich (2008). As method, identifies overdensities within color slices, which are equivalent rest-frame 1.6um stellar bump "red-sequence"....
We present results from a comprehensive imaging survey of 70 radio galaxies at redshifts 1 < z 5.2 using all three cameras on board the Spitzer Space Telescope. The resulting spectral energy distributions unambiguously show stellar population in 46 sources and hot dust emission associated with active nucleus 59. Using new rest-frame S3 μm/S1.6 μm versus S5 μm/S3 criterion, we identify 42 where 1.6 can be measured. For these galaxies, median mass is high, 2 × 1011 M☉, remarkably constant...
We derive stellar masses, ages and star formation histories of massive early-type galaxies in the z=1.237 RDCS1252.9-2927 cluster compare them with those measured a similarly mass-selected sample field contemporaries drawn from GOODS South Field. Robust estimates these parameters are obtained by comparing large grid composite population models 8-9 band photometry rest-frame NUV, optical IR, thus sampling entire relevant domain emission different populations. Additionally, we present new,...
Recent independent results from numerical simulations and observations have shown that brightest cluster galaxies (BCGs) increased their stellar mass by a factor of almost two between z~0.9 z~0.2. The further suggest more than half this is accreted through major mergers. Using sample 18 distant galaxy clusters with over 600 spectroscopically confirmed members them, we search for observational evidence mergers do play significant role. We find merger rate 0.38 +/- 0.14 per Gyr at z~1. While...
We present a multi-wavelength study of galaxy populations in the core massive, X-ray luminous cluster XMMU J2235 at z = 1.39, based on high quality VLT and HST photometry optical near-infrared wavelengths.
The mass and structural evolution of massive galaxies is one the hottest topics in galaxy formation. This because it may reveal invaluable insights into still debated evolutionary processes governing growth assembly spheroids. However, direct comparison between models observations usually prevented by so-called progenitor bias, i.e., new entering observational selection at later epochs, thus eluding a precise study how pre-existing actually evolve size. To limit this effect, we here gather...
We report on the discovery of a z=1.58 mature cluster around high-redshift radio galaxy 7C1753+6311, first identified in Clusters Around Radio-Loud AGN survey. Two-thirds excess galaxies within central 1Mpc lie red sequence with colour that is consistent an average formation redshift zf~3. show 80+/-6% core are quiescent, while remaining 20% due to dusty star formation. demonstrate has enhanced quiescent fraction three times control field. also this enhancement mass dependent: 91+/-9% M*...
We have performed VLT spectroscopy of an almost complete sample 18 early-type galaxies with plus two at , selected from the K20 survey, and derived velocity dispersion for 15+2 them. By combining these data HST images, we study Fundamental Plane (FP), Faber–Jackson Kormendy relations . Compared local one, FP has a remarkably small scatter, shows both offset rotation, which interpret in terms evolution mass-to-light ratio, possibly size. give evidence that rate depends on galaxy mass, being...
Taking advantage of the impressive sensitivity Spitzer to detect massive galaxies at high redshift, we study mid-infrared environments powerful, high-redshift radio 1.2 < z 3. Galaxy cluster member candidates were isolated using a single Spitzer/IRAC color criterion, [3.6]–[4.5] > −0.1 (AB), in fields 48 Using counts-in-cell analysis, identify field as overdense when 15 or more red IRAC sources are found within 1' (i.e., 0.5 Mpc 3) galaxy 5σ flux density limits our data (f4.5 = 13.4 μJy). We...
We present a detailed study of the infrared spectral energy distribution high-redshift radio galaxy MRC 1138-26 at z = 2.156, also known as Spiderweb Galaxy. By combining photometry from Spitzer, Herschel and LABOCA we fit rest-frame 5-300 um emission using two component, starburst active galactic nucleus (AGN), model. The total (8 - 1000 um) luminosity this is (1.97+/-0.28)x10^13 Lsun with (1.17+/-0.27) (0.79+/-0.09)x10^13 due to AGN components respectively. high derived accretion rate...