Galaxy Zoo:bars in disc galaxies

By Karen L. Masters, Robert Nichol, Ben Hoyle, Chris J. Lintott, Steven Bamford, E. Edmondson, L. Fortson, William Keel, Kevin Schawinski, Arfon M. Smith and 1 more. 2010

219 citations recorded by the source corpus.

We present first results from Galaxy Zoo 2, the second phase of the highly successful Galaxy Zoo project (http://www.galaxyzoo.org). Using a volume-limited sample of 13 665 disc galaxies (0.01 < z < 0.06 and Mr < −19.38), we study the fraction of galaxies with bars as a function of global galaxy properties like colour, luminosity and bulge prominence. Overall, 29.4 ± 0.5 per cent of galaxies in our sample have a bar, in excellent agreement with previous visually classified samples of galaxies (although this overall fraction is lower than that measured by automated bar-finding methods). We see a clear increase in the bar fraction with redder (g−r) colours, decreased luminosity and in galaxies with more prominent bulges, to the extent that over half of the red, bulge-dominated disc galaxies in our sample possess a bar. We see evidence for a colour bimodality for our sample of disc galaxies, with a ‘red sequence’ that is both bulge and bar dominated, and a ‘blue cloud’ which has little, or no, evidence for a (classical) bulge or bar. These results are consistent with similar trends for barred galaxies seen recently both locally and at higher redshift, and with early studies using the RC3. We discuss these results in the context of internal (secular) galaxy evolution scenarios and the possible links to the formation of bars and bulges in disc galaxies.

Subfields: Astronomy and Astrophysics, Instrumentation

View Paper: https://www.semanticscholar.org/paper/0a72c3a0a939d32b6404a1382cb406574c943488

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Astronomy and Astrophysics

In Instrumentation

Citations in the corpus

MegaMorph - multiwavelength measurement of galaxy structure: complete Sersic profile information from modern surveys (2012, methodology): “We aim to investigatethis in future by drawing on the data and resources of Galaxy Zoo (Lintott et al. 2011; Masters et al. 2011) AlthoughGALFITM already supports multiple components, an adapted version ofGALAPAGOS-2 will be needed for this work.”
THE IMPACT OF INTERACTIONS, BARS, BULGES, AND ACTIVE GALACTIC NUCLEI ON STAR FORMATION EFFICIENCY IN LOCAL MASSIVE GALAXIES (2012, background): “…Wang et al. (2012) find a clear link between bars and increased central star formation in galaxies with M∗> 3 × 10 10M⊙ and µ∗< 3 × 10 8M⊙ kpc −2, suggesting that bars are critical in the build-up of bulges, and possibly also in the quenching of star formation (see also Masters et al. 2011).”
The green valley is a red herring: Galaxy Zoo reveals two evolutionary pathways towards quenching of star formation in early-and late-type galaxies (2014, background): “Masters et al. (2011, 2012) found that the incidence of bars in massive late-type galaxies increases as they become redder.”
Rotation-invariant convolutional neural networks for galaxy morphology prediction (2015, background): “…have already been used in a wide variety of studies on galaxy structure, formation and evolution (Bamford et al. 2009; Lintott et al. 2009; Schawinski et al. 2009; Skibba et al. 2009; Darg et al. 2010; Masters et al. 2010, 2011; Simmons et al. 2013; Melvin et al. 2014; Willett et al. 2015).”
Galaxy Zoo 2: detailed morphological classifications for 304,122 galaxies from the Sloan Digital Sky Survey (2013, methodology): “Masters et al. (2011) analysed bar classifications in NA10 and the RC3 and the GZ2 bar classifications (albeit before the classification bias was applied).”
Bar formation and evolution in disc galaxies with gas and a triaxial halo: morphology, bar strength and halo properties (2012, background): “…by guest on 30 July 2018 2007; Marinova et al. 2009; Buta et al. 2010; Gadotti 2011; Hoyle et al. 2011; Laurikainen et al. 2011; Masters et al. 2011; Simard et al. 2011; Beirão et al. 2012; Martı́nez-Garcı́a 2012; Pérez, Aguerri & Méndez-Abreu 2012; Wang et al. 2012).”
THE DEPENDENCE OF QUENCHING UPON THE INNER STRUCTURE OF GALAXIES AT 0.5 ⩽ z < 0.8 IN THE DEEP2/AEGIS SURVEY (2012, background): “…increase the central densities of disk galaxies, and thus account forone 37 This number is controversial, recent studies by Nair & Abraham (2010); Masters et al. (2011); Lee et al. (2012) show that the local bar fraction is∼ 30%. of our major findings, namely, higher central stellar densitie in…”