The nature of extremely red galaxies in the local universe

Sodré, L.; Silva, Aline Ribeiro da; Santos, W. A.

doi:10.1093/mnras/stt1188

Cited by 15 publications

(11 citation statements)

References 49 publications

(56 reference statements)

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“…We correct for internal reddening, considering that it has been demonstrated that galaxies with high SFRs and high dust content may contaminate the green valley artificially, not representing an actual state of transitioning between populations (e.g. Sodré et al 2013;Gonçalves et al 2012). To do so, we followed the Calzetti et al (2000) dust correction procedure for UV-optical colours, based on the Balmer decrement.…”

Section: Dust Attenuationmentioning

confidence: 99%

Quenching, bursting, and galaxy shapes: colour transformation as a function of morphology

Sá-Freitas

Gonçalves

Carvalho

et al. 2021

Monthly Notices of the Royal Astronomical Society

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Different mechanisms for quenching star formation in galaxies are commonly invoked in the literature, but the relative impact of each one at different cosmic epochs is still unknown. In particular, the relation between these processes and morphological transformation remains poorly understood. In this work, we measure the effectiveness of changes in star formation rates by analysing a new parameter, the Star Formation Acceleration (SFA), as a function of galaxy morphology. This methodology is capable of identifying both bursting and quenching episodes that occurred in the preceding 300 Myrs. We use morphological classification catalogs based on Deep learning techniques. Our final sample has ∼14,200 spirals and ∼2,500 ellipticals. We find that elliptical galaxies in the transition region have median shorter quenching timescales (τ < 1 Gyr) than spirals (τ ≥ 1 Gyr). This result conforms to the scenario in which major mergers and other violent processes play a fundamental role in galaxy evolution for most ellipticals, not only quenching star formation more rapidly but also playing a role in morphological transformation. We also find that ∼two thirds of galaxies bursting in the green valley in our sample are massive spirals (M⋆ ≥ 1011.0 M⊙) with signs of disturbance. This is in accordance with the scenario where low mass galaxies are losing their gas in a interaction with a massive galaxy: while the former is quenching, the last is being refueled and going through a burst, showing signs of recent interaction.

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Section: Dust Attenuationmentioning

confidence: 99%

Quenching, bursting, and galaxy shapes: colour transformation as a function of morphology

Sá-Freitas

Gonçalves

Carvalho

et al. 2021

Monthly Notices of the Royal Astronomical Society

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“…The internal extinction of the galaxies in our sample has not been taken into account, therefore, it is likely that some contamination by reddened green-valley systems is present (for further reading on the extinction degeneracy, see Worthey 1994;De Meulenaer et al 2013;Sodré et al 2013, and references therein).…”

Section: The Final Samplementioning

confidence: 99%

UV bright red-sequence galaxies: how do UV upturn systems evolve in redshift and stellar mass?

Dantas

Coelho

Gonçalves

2019

Monthly Notices of the Royal Astronomical Society

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The so-called ultraviolet (UV) upturn of elliptical galaxies is a phenomenon characterised by the up-rise of their fluxes in bluer wavelengths, typically in the 1,200-2,500 A range. This work aims at estimating the rate of occurrence of the UV upturn over the entire red-sequence population of galaxies that show significant UV emission. This assessment is made considering it as function of three parameters: redshift, stellar mass, and -what may seem counter-intuitive at first -emission-line classification. We built a multiwavelength spectro-photometric catalogue from the Galaxy Mass Assembly survey, together with aperture-matched data from Galaxy Evolution Explorer and Sloan Digital Sky Survey, covering the redshift range between 0.06 and 0.40. From this sample, we analyse the UV emission among UV bright galaxies, by selecting those that occupy the red-sequence locus in the (NUV-r) × (FUV-NUV) chart; then, we stratify the sample by their emission-line classes. To that end, we make use of emission-line diagnostic diagrams, focusing the analysis in retired/passive lineless galaxies. Then, a Bayesian logistic model was built to simultaneously deal with the effects of all galaxy properties (including emission-line classification or lack thereof). The main results show that retired/passive systems host an up-rise in the fraction of UV upturn for redshifts between 0.06 and 0.25, followed by an in-fall up to 0.35. Additionally, we show that the fraction of UV upturn hosts rises with increasing stellar mass.

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“…Most blue star-forming galaxies are obscured by dust, occupying the redder parts of the galaxy colour-magnitude diagrams (CMD), both in the local Universe (Sodré et al 2013) and at higher redshifts (Gonçalves et al 2012). We correct u, g, and r SDSS magnitudes by intrinsic reddening, through the flux of Hα and H β emission lines (measurement details are described in Brinchmann et al 2004).…”

Section: Datamentioning

confidence: 99%

The angular scale of homogeneity in the local Universe with the SDSS blue galaxies

Avila

Novaes

Bernui

et al. 2019

Monthly Notices of the Royal Astronomical Society

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We probe the angular scale of homogeneity in the local Universe using blue galaxies from the SDSS survey as a cosmological tracer. Through the scaled counts in spherical caps, N (< θ), and the fractal correlation dimension, D 2 (θ), we find an angular scale of transition to homogeneity for this sample of θ H = 22.19 • ±1.02 • . A comparison of this measurement with another obtained using a different cosmic tracer at a similar redshift range (z < 0.06), namely, the HI extragalactic sources from the ALFALFA catalogue, confirms that both results are in excellent agreement (taking into account the corresponding bias correction). We also perform tests to asses the robustness of our results. For instance, we test if the size of the surveyed area is large enough to identify the transition scale we search for, and also we investigate a reduced sample of blue galaxies, obtaining in both cases a similar angular scale for the transition to homogeneity. Our results, besides confirming the existence of an angular scale of transition to homogeneity in different cosmic tracers present in the local Universe, show that the observed angular scale θ H agrees well with what is expected in the ΛCDM scenario. Although we can not prove spatial homogeneity within the approach followed, our results provide one more evidence of it, strengthening the validity of the Cosmological Principle.

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The nature of extremely red galaxies in the local universe

Cited by 15 publications

References 49 publications

Quenching, bursting, and galaxy shapes: colour transformation as a function of morphology

Quenching, bursting, and galaxy shapes: colour transformation as a function of morphology

UV bright red-sequence galaxies: how do UV upturn systems evolve in redshift and stellar mass?

The angular scale of homogeneity in the local Universe with the SDSS blue galaxies

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