Are (Pseudo)bulges in Isolated Galaxies Actually Primordial Relics?

Lorenzo, M. Fernández; Sulentic, J. W.; Verdes–Montenegro, L.; Blasco-Herrera, J.; Argudo-Fernández, M.; Garrido, Julián; Ramírez-Moreta, P.; Ruíz, José Enrique; Sánchez–Expósito, S.; Santander-Vela, J. D.

doi:10.1088/2041-8205/788/2/l39

Cited by 29 publications

(13 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Durbala et al (2008Durbala et al ( , 2009) concluded that isolated galaxies are less clumpy, less concentrated, more symmetric, and may have larger bars than in samples of less isolated galaxies. In addition, these authors found that most AMIGA spirals host pseudobulges rather than classical bulges (see also Fernández-Lorenzo et al 2014). Other commonly-used non-parametric quantities are discussed by Andrae, Jahnke, and Melchior (2011).…”

Section: Introductionmentioning

confidence: 93%

A comprehensive examination of the optical morphologies of 719 isolated galaxies in the AMIGA sample

Buta

Verdes–Montenegro

Damas-Segovia

et al. 2019

Monthly Notices of the Royal Astronomical Society

Self Cite

View full text Add to dashboard Cite

Using images from Sloan Digital Sky Survey Data Release 8, we have re-examined the morphology of 719 galaxies from the Analysis of the interstellar Medium in Isolated GAlaxies (AMIGA) project, a sample consisting of the most isolated galaxies that have yet been identified. The goal is to further improve the classifications of these galaxies by examining them in the context of the Comprehensive de Vaucouleurs revised Hubble-Sandage (CVRHS) system, which includes recognition of features that go beyond the original de Vaucouleurs point of view. Our results confirm previous findings that isolated galaxies are found across the complete revised Hubble sequence, with intermediate to late-type (Sb-Sc) spirals being relatively more common. Elmegreen Arm Classifications are also presented, and show that more than 50% of the 514 spirals in the sample for which an arm class could be judged are grand design (AC 8,9,12). The visual bar fraction for the sample is ≈50%, but only 16% are classified as stronglybarred (SB). The dominant family classification is SA (nonbarred), the dominant inner variety classification is (s) (pure spiral), and the dominant outer variety classification is no outer ring, pseudoring, or lens. The Kolmogorov-Smirnov test is used to check for potential biases in the morphological interpretations, and for any possible relation between rings, bars, and arm classes with local environment and far-infrared excess. The connection between morphology and stellar mass is also examined for a subset of the sample.

show abstract

Section: Introductionmentioning

confidence: 93%

A comprehensive examination of the optical morphologies of 719 isolated galaxies in the AMIGA sample

Buta

Verdes–Montenegro

Damas-Segovia

et al. 2019

Monthly Notices of the Royal Astronomical Society

Self Cite

View full text Add to dashboard Cite

show abstract

“…Their SDSS composite images confirm that these bulges are indeed blue rather than an artefact of our model fitting. The tail of bulge colours out to excessively red (g −i) colours has a less clear explanation; values as high as (g − i) 1.5 mag do not appear physically plausible (Fernández Lorenzo et al 2014;Mendel et al 2014;Kim et al 2016). These bulges are still likely to be some of the most red objects in the sample but our ability to derive a meaningful quantity is severely lessened in the regime where the bulge magnitudes in the g-band are significantly fainter than in the i-band.…”

Section: Separating Galaxy Componentsmentioning

confidence: 99%

xGASS: The impact of photometric bulges on the scatter of HI scaling relations

Cook

Cortese

Catinella

et al. 2019

Monthly Notices of the Royal Astronomical Society

View full text Add to dashboard Cite

We present a structural decomposition analysis of the galaxies in the extended GALEX Arecibo SDSS Survey (xGASS) using (gri ) images from the Sloan Digital Sky Survey. Utilising the 2D Bayesian light profile fitting code ProFit, we fit single-and double-component models taking advantage of a robust Markov chain Monte Carlo optimisation algorithm in which we assume a Sérsic profile for single-component models and a combination of a Sérsic bulge and near -exponential disc (0.5 n 1.5) for double-component models. We investigate the effect of bulges on the atomic hydrogen (H I) content in galaxies by revisiting the H I-to-stellar mass scaling relations with the bulge-to-total ratio measured in the ProFit decompositions. We show that, at both fixed total and disc stellar mass, more bulge-dominated galaxies have systematically lower H I masses, implying that bulge-dominated galaxies with large H I reservoirs are rare in the local Universe. We see similar trends when separating galaxies by a bulgeto-total ratio based either on luminosity or stellar mass, however, the trends are more evident with luminosity. Importantly, when controlling for both stellar mass and star formation rate, the separation of atomic gas content reduces to within 0.3 dex between galaxies of different bulge-to-total ratios. Our findings suggest that the presence of a photometric bulge has little effect on the global H I gas reservoirs of local galaxies.

show abstract

“…KIG 685 is classified as a peculiar elliptical (E + 0 pec T = −4) by Buta et al () (Table ), while Fernández Lorenzo et al () classified it E/S0, that is, slightly later in type ( T = −3). The total absolute magnitude, adopting the distance reported in Table , suggests that the galaxy is located at the bright end of the magnitude distribution of ETGs.…”

Section: Discussionmentioning

confidence: 99%

“…We considered the classification provided by Fernandez‐Lorenzo and AMIGA collaborators ( Fernández Lorenzo et al ), HYPERLEDA and Buta et al (2019). KIG 685 is considered an elliptical by all three classifications, while KIG 895 has an uncertain classification: it is a spiral for Buta et al () and HyperLeda and a late S0/a for Fernández Lorenzo et al (). The large uncertainty in the classification, based on SDSS images, needs to be resolved via high spatial resolution images.…”

Section: Introductionmentioning

confidence: 99%

“…The large uncertainty in the classification, based on SDSS images, needs to be resolved via high spatial resolution images. Their heliocentric velocity and the distance (Table ), computed considering H 0 = 75 km s −1 Mpc −1 , are obtained from Fernández Lorenzo et al (). Their absolute B‐band magnitudes, corrected for Galactic extinction, differ by ≈2 magnitudes.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

High‐resolution morphology and surface photometry of KIG 685 and KIG 895 with ARGOS+LUCI using the Large Binocular Telescope

Rampazzo¹,

Uslenghi

Georgiev

et al. 2019

Astron Nachr

View full text Add to dashboard Cite

We aim to refine the sample of isolated early‐type galaxies in the Analysis of the interstellar Medium of Isolated Galaxies (AMIGA) catalog via high‐resolution imaging. Here, we report the result from a pilot study investigating two candidates, KIG 685 and KIG 895, in K‐band with the laser guide star and wavefront sensing facility ARGOS using the Large Binocular Telescope (LBT). Observations, obtained during the commissioning time, achieved a point spread function (PSF) of ≈0.25″. We present the data reduction and the PSF analysis from the best closed‐loop exposures to investigate the galaxies' morphological structure, including their nuclear region. We used PROFILER for the decomposition of the azimuthal 1D light distribution and GALFIT for the 2D analysis, accounting for ARGOS's PSF. KIG 685 was found to be a S0 galaxy and has been modeled with two Sérsic components representing a pseudobulge (n1D = 2.87 ± 0.21, n2D = 2.29 ± 0.10) and a disk (n1D = 0.95 ± 0.16, n2D = 0.78 ± 0.10). Nearly symmetric ring‐/shell‐like structures emerge after subtracting the GALFIT model from the image. KIG 895 shows a clear irregular arm‐like structure, in which the northern outer arm is reminiscent of a tail. The galaxy body is a disk, best fitted by a single Sérsic profile (n1D = 1.22 ± 0.1; n2D = 1.32 ± 0.12), that is, KIG 895 is a bulge‐less, very late‐type spiral. ARGOS high‐resolution images clearly showed interaction signatures in KIG 895. We suggest that the ring‐/shell‐like residuals in KIG 685, a bona fide early‐type galaxy, point toward a past accretion event.

show abstract

Are (Pseudo)bulges in Isolated Galaxies Actually Primordial Relics?

Cited by 29 publications

References 42 publications

A comprehensive examination of the optical morphologies of 719 isolated galaxies in the AMIGA sample

A comprehensive examination of the optical morphologies of 719 isolated galaxies in the AMIGA sample

xGASS: The impact of photometric bulges on the scatter of HI scaling relations

High‐resolution morphology and surface photometry of KIG 685 and KIG 895 with ARGOS+LUCI using the Large Binocular Telescope

Contact Info

Product

Resources

About