Warps and correlations with intrinsic parameters of galaxies  in the visible and radio

Castro-Rodríguez, N.; López-Corredoira, M.; Sánchez-Saavedra, M. L.; Battaner, E.

doi:10.1051/0004-6361:20020895

Cited by 19 publications

(31 citation statements)

References 46 publications

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“…We present the whole sample of 250 spirals and 26 lenticulars, with limits logr25 > 0.60, B t < 14.5, δ < 0 • , −2.5 < t < 7. It is especially suitable for statistical analysis and, indeed, has already been used to study the relation between intrinsic parameters and warps by Castro-Rodríguez et al (2002). The catalog may obviously be used to choose which galaxies are to be observed in detail.…”

Section: Discussionmentioning

confidence: 99%

A catalog of warps in spiral and lenticular galaxies in the Southern hemisphere

Sánchez-Saavedra

Battaner

Guijarro

et al. 2003

A&A

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Abstract.A catalog of optical warps of galaxies is presented. This can be considered complementary to that reported by Sánchez-Saavedra et al. (1990), with 42 galaxies in the northern hemisphere, and to that by Reshetnikov & Combes (1999), with 60 optical warps. The limits of the present catalog are: logr25 > 0.60, B t < 14.5, δ(2000) < 0• , −2.5 < t < 7. Therefore, lenticular galaxies have also been considered. This catalog lists 150 warped galaxies out of a sample of 276 edge-on galaxies and covers the whole southern hemisphere, except the Avoidance Zone. It is therefore very suitable for statistical studies of warps. It also provides a source guide for detailed particular observations. We confirm the large frequency of warped spirals: nearly all galaxies are warped. The frequency and warp angle do not present important differences for the different types of spirals. However, no lenticular warped galaxy has been found within the specified limits. This finding constitutes an important restriction for theoretical models.

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Section: Discussionmentioning

confidence: 99%

A catalog of warps in spiral and lenticular galaxies in the Southern hemisphere

Sánchez-Saavedra

Battaner

Guijarro

et al. 2003

A&A

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“…This contrasts with the Zinn et al (2003) study who possibly identified CMa stars in the so-called southern arc of the CMa ring. Accreting Galactic satellites could be responsible for the creation of the observed Milky Way warp (Castro-Rodríguez et al 2002). Evidence for the existence of a Galactic warp for the inter-stellar gas and dust are long dated since early HI observations (Oort et al 1958), and more recent inter-stellar diffuse dust emission (Freudenreich et al 1994;Freudenreich 1996) studies.…”

Section: Introductionmentioning

confidence: 99%

Probing the Canis Major stellar over-density as due to the Galactic warp

Momany

Zaggia

Bonifacio

et al. 2004

A&A

103

129

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Abstract. Proper-motion, star counts and photometric catalog simulations are used to explain the detected stellar over-density in the region of Canis Major, claimed to be the core of a disrupted dwarf galaxy (CMa, Martin et al. 2004, MNRAS, 348, 12; Bellazzini et al. 2004, [arXiv:astro-ph/0311119]), as due to the Galactic warp and flare in the external disk. We compare the kinematics of CMa M-giant selected sample with surrounding Galactic disk stars in the UCAC2 catalog and find no peculiar proper motion signature: CMa stars mimic thick disk kinematics. Moreover, when taking into account the Galactic warp and flare of the disk, 2MASS star count profiles reproduce the CMa stellar over-density. This star count analysis is confirmed by direct comparison with synthetic color−magnitude diagrams simulated with the Besançon models (Robin et al. 2003, A&A, 409, 523) that include the warp and flare of the disk. The presented evidence casts doubt on the identification of the CMa overdensity as the core of a disrupted Milky Way satellite. This however does not make clear the origin of over-densities responsible for the ring structure in the anticenter direction of the Galactic halo (Newberg et al. 2002, ApJ, 569, 245; Yanny et al. 2003, ApJ, 588, 824).

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“…The warp angle β seems to better represent the curvature of the warped disk (Ann & Park 2006). There are different definitions of warp asymmetry in the literature (Reshetnikov & Combes 1998;Garcia-Ruzi et al 2002;Castro-Rodriguez et al 2002) but we used the following definition of…”

Section: Results (A) Morphologymentioning

confidence: 99%

The Warped Disk of Integral-Sign Galaxy PGC 20348

Ann

2007

Journal of The Korean Astronomical Society

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We examine the morphology and luminosity distribution of a strongly warped spiral galaxy PGC 20348 by conducting a detailed BV I CCD surface photometry using BOAO 1.8m telescope. The radial surface brightness shows a break at warp radius (r w ) with a shallow gradient in the inner disk and a steeper gradient in the outer disk. The luminosity of east side of the disk is ∼ 0.5 mag fainter than the west side at r > r w . The reason for the asymmetric luminosity distribution is thought to be the asymmetric flarings that result in the formation of a large diffuse region at the edge of the east disk and a smaller diffuse region at the west disk. The vertical luminosity profiles show a thick disk component whose scale heights increase with increasing galactocentric distances. The warp of PGC 20348 seems to be made by the tidal interactions with the two massive companion galaxies since the flarings and radial increase of disk scale heights are thought to be general properties of tidally perturbed disks. According to the colors of the two clumps inside the diffuse region at the edge of the east disk, they seem to be sites of active star formation triggered by tidal forces from the companion galaxies.

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Warps and correlations with intrinsic parameters of galaxies in the visible and radio

Cited by 19 publications

References 46 publications

A catalog of warps in spiral and lenticular galaxies in the Southern hemisphere

A catalog of warps in spiral and lenticular galaxies in the Southern hemisphere

Probing the Canis Major stellar over-density as due to the Galactic warp

The Warped Disk of Integral-Sign Galaxy PGC 20348

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