Evolution of Galaxies

    General
    Description

    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.

    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.

    Related publications

    • The effect of environment on star forming galaxies at redshift 1 First insight from PACS (Corrigendum)

      Not Available

      Popesso, P. et al.

      Advertised on:

      10
      2011
      Citations
      2
    • SDSS galaxies with double-peaked emission lines: double starbursts or active galactic nuclei?

      With the aim of investigating galaxies with two strong simultaneous starbursts, we have extracted a sample of galaxies with double-peaked emission lines in their global spectra from the Sloan Digital Sky Survey (SDSS) spectral data base. We then fitted the emission lines Hα, Hβ, [O III]λ5007, [N II]λ6584, [S II]λ6717 and [S II]λ6731 of 129 spectra

      Pilyugin, L. S. et al.

      Advertised on:

      1
      2012
      Citations
      12
    • Physical Properties of Lyα Emitters at z ~ 0.3 from UV-to-FIR Measurements

      The analysis of the physical properties of low-redshift Lyα emitters (LAEs) can provide clues in the study of their high-redshift analogs. At z ~ 0.3, LAEs are bright enough to be detected over almost the entire electromagnetic spectrum and it is possible to carry out a more precise and complete study than at higher redshifts. In this work, we

      Oteo, I. et al.

      Advertised on:

      6
      2012
      Citations
      16
    • PACS Evolutionary Probe (PEP) - A Herschel key program

      Deep far-infrared photometric surveys studying galaxy evolution and the nature of the cosmic infrared background are a key strength of the Herschel mission. We describe the scientific motivation for the PACS Evolutionary Probe (PEP) guaranteed time key program and its role within the entire set of Herschel surveys, and the field selection that

      Lutz, D. et al.

      Advertised on:

      8
      2011
      Citations
      420
    • OTELO Survey: Optimal Emission-Line Flux Determination with OSIRIS/GTC

      Not Available

      Lara-López, M. A. et al.

      Advertised on:

      2
      2011
      Citations
      4
    • On Star Formation Rates and Star Formation Histories of Galaxies Out to z ~ 3

      We compare multi-wavelength star formation rate (SFR) indicators out to z ~ 3 in the GOODS-South field. Our analysis uniquely combines U to 8 μm photometry from FIREWORKS, MIPS 24 μm and PACS 70, 100, and 160 μm photometry from the PEP, and Hα spectroscopy from the SINS survey. We describe a set of conversions that lead to a continuity across SFR

      Wuyts, Stijn et al.

      Advertised on:

      9
      2011
      Citations
      365
    • Herschel-PACS far-infrared detections of Lyman-α emitters at 2.0 ≲ z ≲ 3.5

      In this work we analyse the physical properties of a sample of 56 spectroscopically selected star-forming (SF) Lyα emitting galaxies at 2.0 ≲ z ≲ 3.5 using both a spectral energy distribution (SED) fitting procedure from rest-frame UV to mid-IR and direct 160 μm FIR observations taken with the Photodetector Array Camera and Spectrometer (PACS)

      Oteo, I. et al.

      Advertised on:

      5
      2012
      Citations
      25
    • FIR Measurements of Lyα Emitters at z <~ 1.0: Dust Attenuation from PACS-Herschel

      One remaining open question regarding the physical properties of Lyα emitters (LAEs) is their dust content and evolution with redshift. The variety of results is large and with those reported by now it is difficult to establish clear relations between dust, other fundamental parameters of galaxies (star formation rate, metallicity, or age), and

      Oteo, I. et al.

      Advertised on:

      7
      2011
      Citations
      10
    • Evolution of the fundamental plane of 0.2 < z < 1.2 early-type galaxies in the EGS

      Context. The fundamental plane links the structural properties of early-type galaxies such as its surface brightness and effective radius with its dynamics. The study of the fundamental plane evolution therefore has important implications for models of galaxy formation and evolution. Aims: This work aims to identify signs of evolution of early-type

      Fernández-Lorenzo, M. et al.

      Advertised on:

      2
      2011
      Citations
      18
    • Enhanced star formation rates in AGN hosts with respect to inactive galaxies from PEP-Herschel observations

      We compare the average star formation (SF) activity in X-ray selected AGN hosts with a mass-matched control sample of inactive galaxies, including both star forming and quiescent sources, in the 0.5 < z < 2.5 redshift range. Recent observations carried out by PACS, the 60-210 μm photometric camera on board the Herschel Space Observatory, in GOODS-S

      Santini, P. et al.

      Advertised on:

      4
      2012
      Citations
      179
    • AGN-host galaxy connection: morphology and colours of X-ray selected AGN at z ≤ 2

      Context. The connection between active galactic nuclei (AGN) and their host galaxies has been widely studied and found to be of great importance for providing answers to some fundamental questions related to AGN fuelling mechanisms, and both their formation and evolution. Aims: Using X-ray data and one of the deepest broad-band optical data sets

      Pović, M. et al.

      Advertised on:

      5
      2012
      Citations
      40
    • A Herschel view of the far-infrared properties of submillimetre galaxies

      We study a sample of 61submillimetre galaxies (SMGs) selected from ground-based surveys, with known spectroscopic redshifts and observed with the Herschel Space Observatory as part of the PACS Evolutionary Probe (PEP) and the Herschel Multi-tiered Extragalactic Survey (HerMES) guaranteed time key programmes. Our study makes use of the broad far

      Magnelli, B. et al.

      Advertised on:

      3
      2012
      Citations
      239
    • Torus and Active Galactic Nucleus Properties of Nearby Seyfert Galaxies: Results from Fitting Infrared Spectral Energy Distributions and Spectroscopy

      We used the CLUMPY torus models and a Bayesian approach to fit the infrared spectral energy distributions and ground-based high angular resolution mid-infrared spectroscopy of 13 nearby Seyfert galaxies. This allowed us to put tight constraints on torus model parameters such as the viewing angle i, the radial thickness of the torus Y, the angular

      Alonso-Herrero, Almudena et al.

      Advertised on:

      8
      2011
      Citations
      199
    • Testing the Unification Model for Active Galactic Nuclei in the Infrared: Are the Obscuring Tori of Type 1 and 2 Seyferts Different?

      We present new mid-infrared imaging data for three Type-1 Seyfert galaxies obtained with T-ReCS on the Gemini-South Telescope at subarcsecond resolution. Our aim is to enlarge the sample studied in a previous work to compare the properties of Type-1 and Type-2 Seyfert tori using clumpy torus models and a Bayesian approach to fit the infrared (IR)

      Ramos-Almeida, C. et al.

      Advertised on:

      4
      2011
      Citations
      174
    • Testing the AGN Unification Model in the Infrared

      We present near-to-mid-infrared spectral energy distributions (SEDs) for 21 Seyfert galaxies, using subarcsecond resolution imaging data. Our aim is to compare the properties Seyfert 1 (Sy1) and Seyfert 2 (Sy2) tori using clumpy torus models and a Bayesian approach to fit the infrared (IR) nuclear SEDs. These dusty tori have physical sizes smaller

      Ramos-Almeida, C. et al.

      Advertised on:

      7
      2012
      Citations
      0
    • The starburst-active galactic nucleus connection in the merger galaxy Mrk 938: an infrared and X-ray view

      Mrk 938 is a luminous infrared (IR) galaxy in the local Universe believed to be the remnant of a galaxy merger. It shows a Seyfert 2 nucleus and intense star formation according to optical spectroscopic observations. We have studied this galaxy using new Herschel far-IR imaging data in addition to archival X-ray, UV, optical, near-IR and mid-IR

      Esquej, P. et al.

      Advertised on:

      6
      2012
      Citations
      16
    • Resolving the nuclear dust distribution of the Seyfert 2 galaxy NGC 3081

      We report far-infrared (FIR) imaging of the Seyfert 2 galaxy NGC 3081 in the range 70-500 μm, obtained with an unprecedented angular resolution, using the Herschel Space Observatory instruments PACS and SPIRE. The 11 kpc (˜70 arcsec) diameter star-forming ring of the galaxy appears resolved up to 250 μm. We extracted IR (1.6-500 μm) nuclear fluxes

      Ramos Almeida, C. et al.

      Advertised on:

      10
      2011
      Citations
      23
    • Quasi-stellar objects in the ALHAMBRA survey. I. Photometric redshift accuracy based on 23 optical-NIR filter photometry

      Context. Even the spectroscopic capabilities of today's ground and space-based observatories can not keep up with the enormous flow of detections (>105 deg-2) unveiled in modern cosmological surveys as: i) would be required enormous telescope time to perform the spectroscopic follow-ups and ii) spectra remain unattainable for the fainter detected

      Matute, I. et al.

      Advertised on:

      6
      2012
      Citations
      22
    • Probing the nuclear and circumnuclear activity of NGC 1365 in the infrared

      We present new far-infrared (70-500 μm) Herschel Photodetector Array Camera and Spectrometer (PACS) and Spectral and Photometric Imaging Receiver (SPIRE) imaging observations as well as new mid-IR Gemini/Thermal-Region Camera Spectrograph imaging (8.7 and 18.3 μm) and spectroscopy of the inner Lindblad resonance (ILR) region (R < 2.5 kpc) of the

      Alonso-Herrero, A. et al.

      Advertised on:

      9
      2012
      Citations
      34

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