Multicomponent decompositions for a sample of S0 galaxies

By E. Laurikainen, Heikki Salo, R. Buta. 2005

180 citations recorded by the source corpus.

We have estimated the bulge-to-total (B/T) light ratios in the Ks band for a sample of 24 SO, S0/a and Sa galaxies by applying a two-dimensional multicomponent decomposition method. For the disc an exponential function is used, the bulges are fitted by a Sersic R 1/n function and the bars and ovals are described either by a Sersic or a Ferrers function. In order to avoid non-physical solutions, preliminary characterization of the structural components is made by inspecting the radial profiles of the orientation parameters and the low azimuthal wavenumber Fourier amplitudes and phases. In order to identify also the inner structures, unsharp masks were created: previously undetected inner spiral arms were found in NGC 1415 and marginally in NGC 3941. Most importantly, we found that S0s have a mean (B/T) K ratio of 0.24 ± 0.11, which is significantly smaller than the mean (B/T) R = 0.6 generally reported in the literature. Also, the surface brightness profiles of the bulges in S0s were found to be more exponential-like than generally assumed, the mean shape parameter of the bulge being = 2.1 ± 0.7. We did not find examples of barred S0s lacking the disc component, but we found some galaxies (NGC 718, 1452 and 4608) having a non-exponential disc in the bar region. To our knowledge, our study is the first attempt to apply a multicomponent decomposition method for a moderately sized sample of early-type disc galaxies.

Subfields: Astronomy and Astrophysics, Atomic and Molecular Physics, and Optics, Instrumentation

View Paper: https://www.semanticscholar.org/paper/dadb0ecbc988c5080e104e4b1a387a833374c75b

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In Astronomy and Astrophysics

1. Alister W. Graham
2. P. Erwin
3. J. Kormendy
4. S. Jogee
5. M. Cappellari
6. P. Hopkins
7. R. Bender
8. S. Khochfar

In Atomic and Molecular Physics, and Optics

1. Alister W. Graham
2. C. Worley
3. Johan H. Knapen
4. J. Kormendy
5. S. Comer'on
6. P. Erwin
7. M. Pohlen
8. J. Beckman

In Instrumentation

1. Alister W. Graham
2. J. Kormendy
3. P. Erwin
4. S. Jogee
5. S. Khochfar
6. R. Bender
7. P. Hopkins
8. M. Cappellari

Citations in the corpus

• The population of barred galaxies in the local universe - I. Detection and characterisation of bars (2009, methodology): “Ferrers (Laurikainen et al. 2005), Freeman (Freeman 1966), and flat bars (Prieto et al. 1997) were considered for the artificial galaxies.”
• Photometric scaling relations of lenticular and spiral galaxies (2010, methodology): “This approach has turned out to be important, not only for barred galaxies (Peng 2002; Laurikainen et al. 2004), but also for galaxies with ovals and lenses (Prieto et al. 2001; Laurikainen et al. 2005, 2009), since these components can have a significant contribution to the total light.”
• THE OUTER DISKS OF EARLY-TYPE GALAXIES. I. SURFACE-BRIGHTNESS PROFILES OF BARRED GALAXIES (2007, methodology): “The Type II (broken-exponential) nature of the profile is not always visible in shallower exposures (e.g., Kent & Glaudell 1989; Laurikainen et al. 2005), but has previously been noted by Kormendy (1984) and Wozniak & Pierce (1991).”
• Inclination- and dust-corrected galaxy parameters: bulge-to-disc ratios and size–luminosity relations (2008, methodology): “Laurikainen et al. (2005) were careful to separate the bar flux from the bulge flux in their K-band analysis of early-type disc galaxies while Balcells et al.’s (2003) K-band sample did not possess bars.”
• The black hole mass – spheroid luminosity relation (2007, background): “In passing we note that lenticular galaxies typically have B/T ratios of ∼0.25 ± 0.10 (Laurikainen et al. 2005; Balcells et al. 2007), the higher B/T value for M32 is to be expected if this is a partially disc-stripped lenticular galaxy (see Bekki et al. 2001).”
• BULGE n AND B/T IN HIGH-MASS GALAXIES: CONSTRAINTS ON THE ORIGIN OF BULGES IN HIERARCHICAL MODELS (2008, methodology): “Laurikainen et al. (2005, 2007) have developed a 2D multicomponent decomposition code designed to model bulges, disks, primary and secondary bars, and lenses; they apply Sérsic functions to bulges and use either Sérsic or Ferrers functions to describe bars and lenses.”
• A REVISED PARALLEL-SEQUENCE MORPHOLOGICAL CLASSIFICATION OF GALAXIES: STRUCTURE AND FORMATION OF S0 AND SPHEROIDAL GALAXIES (2011, background): “…1979; Kent 1985; Byun & Freeman 1995; Scorza & Bender 1995; Baggett et al. 1998; GIM2D: Simard et al. 2002; GALFIT: Peng et al. 2002; BUDA: de Souza et al. 2004; Laurikainen et al. 2005, 2007; Courteau et al. 2007; GASP2D: Méndez-Abreu et al. 2008; Fisher & Drory 2008; Weinzirl et al. 2009).”
• AINUR: Atlas of Images of NUclear Rings (2009, methodology): “First, we deprojected the 2MASS images, where possible using orientation parameters from deep optical and NIR imagesas reported by Laurikainen et al. (2004), Laurikainen et al. (2005), Buta et al. (2006), and Laurikainen et al. (2006).”
• Bars in Disk-dominated and Bulge-dominated Galaxies at z ~ 0: New Insights from ~3600 SDSS Galaxies (2007, background): “…includes both bright early-type galaxies with bulges, and many disk-dominated galaxies of late Hubble types, while samples in earlier studies (e.g., Eskridge et al. 2000; Elmegreen et al. 2002; Laurikainen et al. 2005, 2006; Buta et al. 2006; MJ07) were dominated by the former group of galaxies.”