General
Galaxy evolution is a crucial topic in modern extragalactic astrophysics, linking cosmology to the Local Universe. Their study requires collecting statistically significant samples of galaxies of different luminosities at different distances. It implies the ability to observe faint objects using different techniques, and at different wavelengths, from the centimetre regime to gamma-rays, noy only for comprehensively studying different physical processes, and constraining the spectral energy distribution of the targets, but due to the redshift of the distant galaxies.
The project presented here is aimed to the scientific exploitation of a set of galaxy surveys, of the same areas of the sky, at different wavelengths, that form the database called "Evolución". This database is composed by the surveys OTELO and GLACE, of galaxies in field and clusters, respectively, obtained using the optical Tunable Filters of the instrument OSIRIS of the 10.4m GTC; the survey Lockman SpReSO, composed of optical spectra of galaxies obtained with the OSIRIS instrument at the GTC; and PEP, a survey of Far Infrared images obtained using the ESA Herschel spatial observatory. This database is enriched with ancillary data encompassing from the centimeter regimen (using VLA) through the X-Ray (using the ESA facility XMM).
In this way, "Evolución" provides, for thousands of galaxies, the emission line fluxes of different elements, together with their morphologies and continuum in the optical, NIR, FIR and X-ray, from redshifts ranging from z = 0.4 up to 7.0. GLACE, the survey of clusters using the same techniques and wavelengths than OTELO, allow studying the evolution of cluster galaxies, comparing it with that derived from field ones using OTELO. With these surveys the team is tackling several critical aspects of galaxy evolution such as the evolution of star formation rates (SFR), metallicity, bolometric luminosity, extinction, and the accretion power of active galactic nuclei, among others, with cosmic time and environmental density, for even the faintest or the more distant galaxies observable with the currently existing facilities. Also, the combination of deep observations at different wavelengths, will allow shedding light on the relations among the different objects of the zoo observed at high redshift, which is still largely at stake.
Members
Results
Obtaining the final OTELO catalogue corresponding to the first pointing, has been a milestone for the project. This catalogue represents the deepest extragalactic emission line survey so far obtained, and includes astrometry, and correlated ancillary data ranging from X-Rays to radio (cm). Deriving photometric redshifts and morphologies (using HST/ACS data) will allow the team to tackle the scientific exploitation of this survey. A Lyman-α candidate at a redshift larger than 6 is shown in the image below.
Scientific activity
Related publications
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The multi-object spectroscopy (MOS) observations automatized production lineOSIRIS (Optical System for Imaging and low-Intermediate-Resolution Integrated Spectroscopy) Multi-Object Spectroscopy (MOS) observing mode is available to the science community of the GTC (Gran Telescopio Canarias) from early 2014. The MOS production line allows the researchers to specify a MOS observation in a self-contained way by using aVaz Cedillo, J. J. et al.
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72018 -
High redshift galaxies in the ALHAMBRA survey. II. Strengthening the evidence of bright-end excess in UV luminosity functions at 2.5 ≤ z≤ 4.5 by PDF analysisContext. Knowing the exact shape of the ultraviolet (UV) luminosity function (LF) of high-redshift galaxies is important to understand the star formation history of the early Universe. However, the uncertainties, especially at the faint and bright ends of the LFs, remain significant. Aims: In this paper, we study the UV LF of redshift z = 2.5 - 4.5Viironen, K. et al.
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72018 -
A simultaneous search for high-z LAEs and LBGs in the SHARDS surveyWe have undertaken a comprehensive search for both Lyman alpha emitters (LAEs) and Lyman break galaxies (LBGs) in the Survey for High-z Absorption Red and Dead Sources (SHARDS) Survey of the Great Observatories Origins Deep Survey North field. SHARDS is a deep imaging survey, made with the 10.4 m Gran Telescopio Canarias, employing 25 medium bandArrabal Haro, P. et al.
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82018 -
280 one-opposition near-Earth asteroids recovered by the EURONEAR with the Isaac Newton TelescopeContext. One-opposition near-Earth asteroids (NEAs) are growing in number, and they must be recovered to prevent loss and mismatch risk, and to improve their orbits, as they are likely to be too faint for detection in shallow surveys at future apparitions. Aims: We aimed to recover more than half of the one-opposition NEAs recommended forVaduvescu, O. et al.
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12018 -
The ALHAMBRA survey: 2D analysis of the stellar populations in massive early-type galaxies at z < 0.3We present a technique that permits the analysis of stellar population gradients in a relatively low-cost way compared to integral field unit (IFU) surveys. We developed a technique to analyze unresolved stellar populations of spatially resolved galaxies based on photometric multi-filter surveys. This technique allows the analysis of vastly largerSan Roman, I. et al.
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12018 -
Young LMC clusters: the role of red supergiants and multiple stellar populations in their integrated light and CMDsThe optical integrated spectra of three Large Magellanic Cloud young stellar clusters (NGC 1984, NGC 1994 and NGC 2011) exhibit concave continua and prominent molecular bands which deviate significantly from the predictions of single stellar population (SSP) models. In order to understand the appearance of these spectra, we create a set of youngAsa'd, Randa S. et al.
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112017 -
The ALHAMBRA survey: B-band luminosity function of quiescent and star-forming galaxies at 0.2 ≤ z < 1 by PDF analysisAims: Our goal is to study the evolution of the B-band luminosity function (LF) since z 1 using ALHAMBRA data. Methods: We used the photometric redshift and the I-band selection magnitude probability distribution functions (PDFs) of those ALHAMBRA galaxies with I ≤ 24 mag to compute the posterior LF. We statistically studied quiescent and starLópez-Sanjuan, C. et al.
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32017 -
A Ks-band-selected catalogue of objects in the ALHAMBRA surveyThe original ALHAMBRA catalogue contained over 400 000 galaxies selected using a synthetic F814W image, to the magnitude limit AB(F814W) ≈ 24.5. Given the photometric redshift depth of the ALHAMBRA multiband data ( = 0.86) and the approximately I-band selection, there is a noticeable bias against red objects at moderate redshift. We avoid this biasNieves-Seoane, L. et al.
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22017 -
Stellar populations of galaxies in the ALHAMBRA survey up to z ~ 1. I. MUFFIT: A multi-filter fitting code for stellar population diagnosticsAims: We present MUFFIT, a new generic code optimized to retrieve the main stellar population parameters of galaxies in photometric multi-filter surveys, and check its reliability and feasibility with real galaxy data from the ALHAMBRA survey. Methods: Making use of an error-weighted χ2-test, we compare the multi-filter fluxes of galaxies with theDíaz-García, L. A. et al.
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102015 -
The ALHAMBRA survey: Estimation of the clustering signal encoded in the cosmic varianceAims: The relative cosmic variance (σv) is a fundamental source of uncertainty in pencil-beam surveys and, as a particular case of count-in-cell statistics, can be used to estimate the bias between galaxies and their underlying dark-matter distribution. Our goal is to test the significance of the clustering information encoded in the σv measured inLópez-Sanjuan, C. et al.
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102015 -
Testing Microvariability in Quasar Differential Light Curves Using Several Field StarsMicrovariability consists of small timescale variations of low amplitude in the photometric light curves of quasars and represents an important tool to investigate their inner core. Detection of quasar microvariations is challenging because of their non-periodicity, as well as the need for high monitoring frequency and a high signal-to-noise ratiode Diego, J. A. et al.
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82015 -
On the nature of Hα emitters at z ˜ 2 from the HiZELS survey: physical properties, Lyα escape fraction and main sequenceWe present a detailed multiwavelength study (from rest-frame ultraviolet to far-infrared) of narrow-band selected, star-forming (SF) Hα emitters (HAEs) at z ˜ 2.23 taken from the High-Redshift(Z) Emission Line Survey (HiZELS). We find that HAEs have similar properties and colours derived from spectral energy distributions as sBzK galaxies, andOteo, I. et al.
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92015 -
The impact from survey depth and resolution on the morphological classification of galaxiesWe consistently analyse for the first time the impact of survey depth and spatial resolution on the most used morphological parameters for classifying galaxies through non-parametric methods: Abraham and Conselice-Bershady concentration indices, Gini, M20 moment of light, asymmetry, and smoothness. Three different non-local data sets are usedQuintana, J. M. et al.
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102015 -
Galaxy clusters and groups in the ALHAMBRA surveyWe present a catalogue of 348 galaxy clusters and groups with 0.2 z 1.2 selected in the 2.78 deg2 Advanced Large, Homogeneous Area Medium Band Redshift Astronomical (ALHAMBRA) survey. The high precision of our photometric redshifts, close to 1 per cent, and the wide spread of the seven ALHAMBRA pointings ensure that this catalogue has better massAscaso, B. et al.
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92015 -
The Arizona Radio Observatory Survey of Molecular Gas in Nearby Normal Spiral Galaxies I: The DataUsing the ARO KP 12 m telescope, we have carried out a CO(1–0) and 13CO(1–0) survey of the central regions of 113 “normal” spiral galaxies (i.e., unperturbed and with little or no nuclear activity). Our sample spans the whole range of morphological types (T = 1–7), with distances up to 75 Mpc. The detection rates for the observed objects are 99.1%Vila-Vilaro, B. et al.
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62015 -
San Pedro Mártir observations of microvariability in obscured quasarsFast brightness variations are a unique tool to probe the innermost regions of active galactic nuclei (AGN). These variations are called microvariability or intra-night variability, and this phenomenon has been monitored in samples of blazars and unobscured AGNs. Detecting optical microvariations in targets hidden by the obscuring torus is aPolednikova, J. et al.
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62015 -
GLACE survey: OSIRIS/GTC tuneable filter Hα imaging of the rich galaxy cluster ZwCl 0024.0+1652 at z = 0.395. I. Survey presentation, TF data reduction techniques, and catalogueThe cores of clusters at 0 ≲ z ≲ 1 are dominated by quiescent early-type galaxies, whereas the field is dominated by star-forming late-type galaxies. Clusters grow through the accretion of galaxies and groups from the surrounding field, which implies that galaxy properties, notably the star formation ability, are altered as they fall into overdenseSánchez-Portal, M. et al.
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62015 -
The ALHAMBRA survey: accurate merger fractions derived by PDF analysis of photometrically close pairsAims: Our goal is to develop and test a novel methodology to compute accurate close-pair fractions with photometric redshifts. Methods: We improved the currently used methodologies to estimate the merger fraction fm from photometric redshifts by (i) using the full probability distribution functions (PDFs) of the sources in redshift space; (ii)López-Sanjuan, C. et al.
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42015 -
The nuclear and extended infrared emission of the Seyfert galaxy NGC 2992 and the interacting system Arp 245We present subarcsecond resolution infrared (IR) imaging and mid-IR (MIR) spectroscopic observations of the Seyfert 1.9 galaxy NGC 2992, obtained with the Gemini North Telescope and the Gran Telescopio CANARIAS (GTC). The N-band image reveals faint extended emission out to ˜3 kpc, and the polycyclic aromatic hydrocarbon features detected in the GTCGarcía-Bernete, I. et al.
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52015 -
High redshift galaxies in the ALHAMBRA survey . I. Selection method and number counts based on redshift PDFsContext. Most observational results on the high redshift restframe UV-bright galaxies are based on samples pinpointed using the so-called dropout technique or Ly-α selection. However, the availability of multifilter data now allows the dropout selections to be replaced by direct methods based on photometric redshifts. In this paper we present theViironen, K. et al.
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42015
