scholarly journals Probing the Redshift Desert Using the Gemini Deep Deep Survey: Observing Galaxy Mass Assembly at z > 1

2005 ◽  
Vol 216 ◽  
pp. 390-397
Author(s):  
Karl Glazebrook ◽  
Keyword(s):  
Spectroscopic Studies ◽  
Star Forming ◽  
Hubble Sequence ◽  
First Results ◽  
Deep Survey ◽  
Redshift Survey ◽  
Mass Assembly ◽  
Galaxy Assembly ◽  
First Time ◽  
The Universe

The aim of the Gemini Deep Deep Survey is to push spectroscopic studies of complete galaxy samples (both red and blue objects) significantly beyond z = 1; this is the redshift where the current Hubble sequence of ellipticals and spirals is already extant. In the Universe at z = 2 the only currently spectroscopically confirmed galaxies are blue, star-forming and of fragmented morphology. Exploring this transition means filling the ‘redshift desert’ 1 < z < 2 where there is a dearth of spectroscopic measurements. To do this we need to secure redshifts of the oldest, reddest galaxies (candidate ellipticals) beyond z > 1 which has led us to carry out the longest exposure redshift survey ever done: 100 ksec spectroscopic MOS exposures with GMOS on Gemini North. We have developed an implementation of the CCD “nod & shuffle” technique to ensure precise sky-subtraction in these ultra-deep exposures. At the halfway mark the GDDS now has ∼ 36 galaxies in the redshift desert 1.2 < z < 2 extending up to z = 1.97 and I < 24.5 with secure redshifts based on weak rest-frame UV absorption features complete for both red, old objects and young, blue objects. The peak epoch of galaxy assembly is now being probed by direct spectroscopic investigation for the first time. on behalf of the GDDS team I present our first results on the properties of galaxies in the ‘redshift desert’.

scholarly journals Hubble Sequence as a Temporal Evolution Sequence

1999 ◽  
Vol 186 ◽  
pp. 491-491
Author(s):  
Xiaolei Zhang
Keyword(s):  
Spiral Galaxies ◽  
Temporal Evolution ◽  
Natural Question ◽  
Late Type ◽  
Present Epoch ◽  
Hubble Sequence ◽  
Deep Survey ◽  
Deep Fields ◽  
The Universe ◽  
Evolution Sequence

The results from Hubble Space Telescope's Medium Deep Survey and Deep Fields indicate that there exists far more blue spiral galaxies at the intermediate and high redshifts than at the present epoch. A natural question therefore is: what have become of these excess late type galaxies as the Universe aged?

scholarly journals Early Results from the VIMOS VLT Deep Survey

2005 ◽  
Vol 216 ◽  
pp. 381-389
Author(s):  
O. Le Fèvre ◽  
C. Adami ◽  
O. Ilbert ◽  
V. Le Brun ◽  
C. Marinoni ◽  
...  
Keyword(s):  
Large Scale ◽  
Limited Sample ◽  
Redshift Distribution ◽  
Star Forming ◽  
Large Scale Structures ◽  
Early Results ◽  
Main Challenge ◽  
Deep Survey ◽  
Scale Structures ◽  
First Time

The VIMOS VLT Deep Survey (VVDS) is underway to study the evolution of galaxies, large scale structures and AGNs, from the measurement of more than 100 000 spectra of faint objects. We present here the results from the first epoch observations of more than 20000 spectra. The main challenge of the program, the redshift measurements, is described, in particular entering the “redshift desert” in the range 1.5 < z < 3 for which only very weak features are detected in the observed wavelength range. The redshift distribution of a magnitude limited sample brighter than IAB = 24 is presented for the first time, showing a peak at a low redshift z ∼ 0.7, and a tail extending all the way above z = 4. The evolution of the luminosity function out to z = 1.5 is presented, with the LF of blue star forming galaxies carrying most of the evolution, with L* changing by more than two magnitudes for this sub-sample.

scholarly journals Radio Sources in the 2dF Galaxy Redshift Survey I. Radio Source Populations

1999 ◽  
Vol 16 (3) ◽  
pp. 247-256 ◽  
Author(s):  
Elaine M. Sadler ◽  
V. J. McIntyre ◽  
C. A. Jackson ◽  
R. D. Cannon
Keyword(s):  
Radio Galaxy ◽  
Radio Continuum ◽  
Radio Sources ◽  
Star Forming ◽  
Sky Survey ◽  
Homogeneous Set ◽  
First Results ◽  
Redshift Survey ◽  
Galaxy Redshift ◽  
Source Populations

AbstractWe present the first results from a study of the radio continuum properties of galaxies in the 2dF Galaxy Redshift Survey, (2dFGRS) based on thirty 2dF fields covering a total area of about 100 deg2. About 1·5% of galaxies with bJ < 19·4 mag. are detected as radio continuum sources in the NRAO VLA Sky Survey (NVSS). Of these, roughly 40% are star-forming galaxies and 60% are active galaxies (mostly low-power radio galaxies and a few Seyferts). The combination of 2dFGRS and NVSS will eventually yield a homogeneous set of around 4000 radio-galaxy spectra, which will be a powerful tool for studying the distribution and evolution of both AGN and starburst galaxies out to z ∼ 0·3.

Mapping the Local and Distant Universe with SUMSS

2005 ◽  
Vol 216 ◽  
pp. 211-218
Author(s):  
Elaine M. Sadler ◽  
Richard W. Hunstead ◽  
Thomas Mauch ◽  
Duncan Campbell-Wilson ◽  
Carole A. Jackson ◽  
...  
Keyword(s):  
Radio Source ◽  
Radio Galaxies ◽  
Radio Continuum ◽  
Space Distribution ◽  
Local Universe ◽  
Star Forming ◽  
Sky Survey ◽  
First Results ◽  
Redshift Survey ◽  
Galaxy Redshift

The Sydney University Molonglo Sky Survey (SUMSS) is a radio continuum imaging survey of the southern sky at 843 MHz, with similar sensitivity and resolution to the northern NRAO VLA Sky Survey (NVSS). We have combined radio data from SUMSS and NVSS with optical spectra from the 2dF Galaxy Redshift Survey and 6dF Galaxy Survey to study the space distribution and properties of both AGN and star-forming galaxies in the local universe (redshift range 0 < z < 0.3). We also discuss new results on radio-source clustering in the more distant universe (z ∼ 1) and present the first results from a search for the most distant (z > 3) southern radio galaxies.

scholarly journals Evolution of the galaxy merger rate since z=2 from the UKIDSS Ultra-Deep Survey

2012 ◽  
Vol 8 (S295) ◽  
pp. 58-58
Author(s):  
S. Foucaud ◽  
P.-W. Wang ◽  
O. Almaini ◽  
R. Grützbauch ◽  
W. G. Hartley ◽  
...  
Keyword(s):  
Near Infrared ◽  
Optical Data ◽  
Massive Galaxies ◽  
Wet Gas ◽  
The Galaxy ◽  
Deep Survey ◽  
Mass Assembly ◽  
Merger Rate ◽  
Biased Samples ◽  
The Universe

AbstractIt is now clear that the epoch when the Universe was half of its current age is a crucial period during which galaxies assembled their mass and evolved into the galaxies we observe in the local Universe. However, so far only very few direct studies of mass assembly in action, hence galaxy merging, were conducted over z=1 and usually relied on very small or biased samples. Based on very deep near infrared survey data, the latest UKIDSS-UDS DR8, combined with the optical data conducted by Subaru and CFHT and Spitzer IRAC observations, we explored the evolution of the merging rate up to z = 2, over the largest volume of the Universe at 0.4<z<2 ever sampled. The pair fraction is found to decrease by a factor of two during this period, and wet (gas rich) mergers dominate largely. The dry mergers are very rare, ruling it out as the main mechanism for the mass assembly of passive massive galaxies. Also while massive galaxies undergo a decrease of their pair fraction during this period, less massive systems follow an increase during the same period.

scholarly journals Luminosity Density Evolution in the Universe and Cosmological Parameters

1999 ◽  
Vol 183 ◽  
pp. 145-150
Author(s):  
Tomonori Totani
Keyword(s):  
Star Formation ◽  
High Redshift ◽  
Formation Rate ◽  
Cosmological Parameters ◽  
Star Formation History ◽  
Density Evolution ◽  
Hubble Sequence ◽  
Formation History ◽  
Redshift Survey ◽  
The Universe

Star formation history in galaxies is strongly correlated to their present-day colors and the Hubble sequence can be considered as a sequence of different star formation history. Therefore we can model the cosmic star formation history based on the colors of local galaxies, and comparison to direct observations of luminosity density evolution at high redshift gives a new test for the cosmological parameters which is insensitive to merger history of galaxies. The luminosity density evolution in 0 < z < 1 observed by the Canada-France Redshift Survey in three wavebands of 2800Å, 4400Å, and 1μm indicates that the Λ-dominated flat universe with λ0 ∼ 0.8 (> 0.53 at 95%CL) is strongly favored.The cosmic star formation rate (SFR) at z > 2 is also compared to the latest data of the Hubble Deep Field including new data which were not incorporated in the previous work of Totani, Yoshii, & Sato (1997), and our model of the luminosity density of spiral galaxies taking account of gas infall is consistent with the observations. Starbursts in elliptical galaxies, which are expected from the galactic wind model, however overproduce SFRs and hence they should be formed at z ≳ 5 or their UV emission has to be hidden by dust extinction. The amount of metals in galactic winds and escaping ionizing photons are enough to contaminate the Lyα forests or to reionize the universe.

scholarly journals Probing the Mass Assembly and Chemical Evolution of high-z Galaxies with MASSIV

2010 ◽  
Vol 6 (S277) ◽  
pp. 134-137
Author(s):  
T. Contini ◽  
B. Epinat ◽  
J. Queyrel ◽  
D. Vergani ◽  
L. Tasca ◽  
...  
Keyword(s):  
Galaxy Evolution ◽  
Chemical Properties ◽  
Chemical Abundances ◽  
Star Forming ◽  
Spatially Resolved ◽  
Wide Range ◽  
Mass Assembly ◽  
Galaxy Assembly ◽  
Galaxy Population ◽  
Stellar Masses

AbstractUnderstanding the different mechanisms of galaxy assembly at various cosmic epochs is a key issue for galaxy evolution and formation models. We present MASSIV (Mass Assembly Survey with SINFONI in VVDS) in this context, an on-going survey with VLT/SINFONI aiming to probe the kinematics and chemical abundances of a unique sample of 84 star-forming galaxies selected in the redshift range z ~ 1−2. This large sample, spanning a wide range of stellar masses, is unique at these high redshifts and statistically representative of the overall galaxy population. In this paper, we give an overview of the MASSIV survey and then focus on the spatially-resolved chemical properties of high-z galaxies and their implication on the process of galaxy assembly.

scholarly journals ALPINE: The ALMA [CII] survey of normal star-forming galaxies at 4 < z < 6

2019 ◽  
Vol 15 (S352) ◽  
pp. 210-215
Author(s):  
Olivier Le Fèvre ◽  
Matthieu Bethermin ◽  
Andreas Faisst ◽  
P. Capak ◽  
P. Cassata ◽  
...  
Keyword(s):  
Detection Rate ◽  
Reference Sample ◽  
Ancillary Data ◽  
Star Forming ◽  
Normal Star ◽  
Flux Limit ◽  
Wide Range ◽  
Mass Assembly ◽  
Galaxy Assembly ◽  
Selection Of

AbstractThe ALMA-ALPINE [CII] survey (A2C2S) aims at characterizing the properties of normal star-forming galaxies (SFGs) observed in the [CII]-158μm line in the period of rapid mass assembly at redshifts 4 < z < 6. Here we present the survey and the selection of 118 galaxies observed with ALMA, selected from large samples of galaxies with spectroscopic redshifts derived from UV-rest frame. The observed properties derived from the ALMA data are presented and discussed in terms of the overall detection rate in [CII] and far-IR continuum. The sample is representative of the SFG population at these redshifts. The overall detection rate is 61% down to a flux limit of 0.07 mJy. From a visual inspection of the [CII] data cubes together with the large wealth of ancillary data we find a surprisingly wide range of galaxy types, including 32.4% mergers, 25.7% extended and dispersion dominated, 13.5% rotating discs, and 16.2% compact, the remaining being too faint to be classified. ALPINE sets a reference sample for the gas distribution in normal star-forming galaxies at a key epoch in galaxy assembly, ideally suited for studies with future facilities like JWST and ELTs.

scholarly journals SXDF-UDS-CANDELS-ALMA 1.5 arcmin2 deep survey

2015 ◽  
Vol 11 (S319) ◽  
pp. 92-95 ◽  
Author(s):  
K. Kohno ◽  
Y. Yamaguchi ◽  
Y. Tamura ◽  
K. Tadaki ◽  
B. Hatsukade ◽  
...  
Keyword(s):  
Near Infrared ◽  
Star Forming ◽  
Luminosity Functions ◽  
Deep Survey ◽  
Infrared Surveys ◽  
History Of ◽  
The Universe

AbstractWe have conducted 1.1 mm ALMA observations of a contiguous 105” × 50” or 1.5 arcmin2 window in the SXDF-UDS-CANDELS. We achieved a 5σ sensitivity of 0.28 mJy, giving a flat sensus of dusty star-forming galaxies with LIR ~6×1011L⊙ (if Tdust=40K) up to z ~ 10 thanks to the negative K-correction at this wavelength. We detected 5 brightest sources (S/N>6) and 18 low-significant sources (5>S/N>4; they may contain spurious detections, though). One of the 5 brightest ALMA sources (S1.1mm = 0.84 ± 0.09 mJy) is extremely faint in the WFC3 and VLT/HAWK-I images, demonstrating that a contiguous ALMA imaging survey uncovers a faint dust-obscured population invisible in the deep optical/near-infrared surveys. We find a possible [CII]-line emitter at z=5.955 or a low-z CO emitting galaxy within the field, allowing us to constrain the [CII] and/or CO luminosity functions across the history of the universe.

scholarly journals The evolution of the mass-metallicity relation up to z≈0.9 from the VIMOS/VLT Deep Survey

2006 ◽  
Vol 2 (S235) ◽  
pp. 408-411 ◽  
Author(s):  
F. Lamareille ◽  
T. Contini ◽  
S. Charlot ◽  
J. Brinchmann ◽  
Keyword(s):  
Stellar Population ◽  
Spectral Features ◽  
Local Universe ◽  
Star Forming ◽  
First Results ◽  
Deep Survey ◽  
The Masses ◽  
Star Formation Histories ◽  
Photo Ionization ◽  
Good Agreement

AbstractWe present the first results derived from the spectrophotometric properties of the Vimos VLT Deep Survey (VVDS) first epoch data. We have measured the spectral features (emission/absorption lines, 4000Å break) of a sample a ≈8000 galaxies taken from the VVDS deep 02h and CDFS fields using the platefit VVDS pipeline. We first selected a sub-sample of star-forming galaxies, which were distinguished from narrow-line AGNs by standard and blue diagnostic diagrams. Then the gas-phase oxygen abundances have been derived by fitting all available emission lines towards photo-ionization models. Finally the masses have been derived by fitting all photometric points together with significant spectral features to a library of stellar population models with complex star formation histories. The mass-metallicity relation that we find at low redshifts is in good agreement with previsous studies performed in the local Universe. We find moreover a significant evolution of the mass-metallicity relation with the redshift, the galaxies having on average less metals at a given mass when the redshift increases. We also find a flattening of the mass-metallicity relation up to z ~ 1.

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