New list of peculiar velocities of RFGC
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New list of peculiar velocities of RFGC
arXiv:astro-ph/0510037vl 3 Oct 2005New list of peculiar velocities of RFGC galaxiess. L. Pamovsky and A. V. Ihgay39483Astronomical Observatory of Kyiv New list of peculiar velocities of RFGC v Taras Shevchenko National University, Olkservatorna 3. 04053, Kyiv, UkraineAbstractWe present a new version of the list of peculiar velocities of 15G1 flat eilgo-un spirals from the RFGC catalogue. It differs from the previous version by 233 new data and 34 corrected data. A new regression was use New list of peculiar velocities of RFGC d for distances estimation based on the 'Hilly-Fisher relationship in the "linear diameter HI line width” variant. Moreover, We present velocities forNew list of peculiar velocities of RFGC
3 models of galaxies collective mot ion. They are a D-inodel (dipole, Hubble expansion + bulk motion with constant speed), DQ-modcl (a quadrupole terarXiv:astro-ph/0510037vl 3 Oct 2005New list of peculiar velocities of RFGC galaxiess. L. Pamovsky and A. V. Ihgay39483Astronomical Observatory of Kyiv New list of peculiar velocities of RFGC motion is very important for cosmology and cosmography. So we need large representative samples of galaxies peculiar velocities, covering the whole sky. Karachentsev {1989) proposed to use thin edge-on spiral galaxies as “test particles" for collective non-Hubble motion of galaxies. He was the head New list of peculiar velocities of RFGC of the group of astronomers from the Special Astrophysical Observatory of the Russian Academy of Sciences (Russia) and Astronomical Oliservatory of thNew list of peculiar velocities of RFGC
e Kyiv Taras Shevchenko National University (Ukraine) who prepared the catalogues of such galaxies Flat Galaxies Catalogue (FGC) (Karachentsev et al, arXiv:astro-ph/0510037vl 3 Oct 2005New list of peculiar velocities of RFGC galaxiess. L. Pamovsky and A. V. Ihgay39483Astronomical Observatory of Kyiv New list of peculiar velocities of RFGC ■ 'ion of objects satisfying Che conditions o/h > 7 mid a > 0.6', where a and b arc the major and minor axes. The FGC and RFGC catalogues contain 4455 and 4236 galaxies respectively and each of them covers the entire sky. Since the selection was performed using the surveys POSS-I ami ESO/SERC, which New list of peculiar velocities of RFGC have different photometric depth, t he diameters of the southern-sky galaxies were reduced to the system POSS-I, which turned out to lie close to theNew list of peculiar velocities of RFGC
system (tỵ,. The substantiation of selecting exactly flat galaxies and a detailed analysis of optical properties of the catalogue objects arc availabarXiv:astro-ph/0510037vl 3 Oct 2005New list of peculiar velocities of RFGC galaxiess. L. Pamovsky and A. V. Ihgay39483Astronomical Observatory of Kyiv New list of peculiar velocities of RFGC l curves Vroe for 1327 RFGC galaxies from different sources listed below. Some of them are obvious outliers. After omitting these “bad” data the sample was reduced to 1271 galaxies (see Fig. 1). These galaxies lie quite homogeneously over the celestial sphere except a Milky Way zone (see Fig. 2). Th New list of peculiar velocities of RFGC is sample was the basis for building a regression for estimation of galaxies’ distances. In the paper (Parnovsky Ct al. 2001) three regressions were oNew list of peculiar velocities of RFGC
btained for different models of peculiar velocity field. The regression for simplest D-model was used to create a list of peculiar velocities of 1327 arXiv:astro-ph/0510037vl 3 Oct 2005New list of peculiar velocities of RFGC galaxiess. L. Pamovsky and A. V. Ihgay39483Astronomical Observatory of Kyiv New list of peculiar velocities of RFGC ears later the HyperLeda extragalactic database ( http://leda.univ-lyonl.fr) contained some new data for RFGC galaxies. Taking into account these data we compiled a new sample of 1561 RFGC galaxies with known radial velocities ami HI 21cm line widths [6]. It contains 233 new data. Data for another 3 New list of peculiar velocities of RFGC 4 galaxies were changed because their HyperLeda data fitted regression much better than previous data. After discarding 69 “bad” data we got a sampleNew list of peculiar velocities of RFGC
of 1492 data, which was used for obtaining regressions for estimation of distances (Parnovsky and 'htgay, 2(101). We used the same three models of colarXiv:astro-ph/0510037vl 3 Oct 2005New list of peculiar velocities of RFGC galaxiess. L. Pamovsky and A. V. Ihgay39483Astronomical Observatory of Kyiv New list of peculiar velocities of RFGC ld was expanded in terms of galaxy’s radial vector r. It was used to obtain some models of dependence of galaxy’s radial velocity V' from r. In the simplest D-model (Hubble law + dipole) we haveV = ỉi + vdip + ó V, R= Hr. V'a'p = D,n,, n = r/r, r = |r),-11Figure 1: Deviations of ratlin) velocities f New list of peculiar velocities of RFGC rom regression for D-model vs distances. Crosses mark “Imd” data.where IÍ is the Hubble constant. 1) is a velocity of homogeneous bulk mot ion. SV isNew list of peculiar velocities of RFGC
a random deviat ion and it is a unit vector towards galaxy. In our notation we use the Einstein rule: summation by all the repeating indices. After adarXiv:astro-ph/0510037vl 3 Oct 2005New list of peculiar velocities of RFGC galaxiess. L. Pamovsky and A. V. Ihgay39483Astronomical Observatory of Kyiv New list of peculiar velocities of RFGC ocity field. The DQO-model inchides octopole components of velocity field described by vector p and traceless symmetrical tensor o of rank 3:V = /? + vdip ++ vorl + SV, vwt = R2(ptn, + OMntnknt).(3)In order to calculate a peculiar velocity VrỊMjC = V - Hr one must have an estimation of galaxy’s dist New list of peculiar velocities of RFGC ance r or a corresponding Hubble radial velocity R = Hr. We use a generalized Tully-Fisher relationship (Hilly and Fisher, 1977)in the “linear diameteNew list of peculiar velocities of RFGC
r HI line width” variant. It has a form (Parnovsky et al, 2001, Parnovsky and liigay, 2004)R = (C| +Ợ2/i + C3/rr)lkWar + C4W-Wđ*+ Cs(W^o)a/(Or)a + a/«arXiv:astro-ph/0510037vl 3 Oct 2005New list of peculiar velocities of RFGC galaxiess. L. Pamovsky and A. V. Ihgay39483Astronomical Observatory of Kyiv New list of peculiar velocities of RFGC /SERC reproductions. T is a morphological type indicator (7‘ = It - 5.35. where If is a Hubble type: It = 5 corresponds to type Sc) and IỈ is a surface brightness indicator (IỈ = ỈSB - 2, where Isb is a surface brightness index from RFGC; brightness decreases from I to IV').The D-model has 9 paramet New list of peculiar velocities of RFGC ers (6 coefficients c and 3 components of vector D), DQ-modcl has 11 parameters (5 components of tensor Q are added) and DQO-model are described by 24New list of peculiar velocities of RFGC
coefficients. They was calculated by least square method for different subsamples with distances limitation to make the sample more homogeneous in dearXiv:astro-ph/0510037vl 3 Oct 2005New list of peculiar velocities of RFGC galaxiess. L. Pamovsky and A. V. Ihgay39483Astronomical Observatory of Kyiv New list of peculiar velocities of RFGC 0(H).290’-90Figure 2: Distribution of 1561 flat galaxies over the celestial sphere in the galactic coordinates. Crosses mark "bad” data, squares new entries.Note that there arc other models of collective motion luiscd on more sophisticated general relativistic approach. In the paper by I’arnovsky an New list of peculiar velocities of RFGC d Gaydamaka (20Ơ1) they were applied to the sample mentioned above. Using cocilieienl obtained in this paper and data from our Table I one can make aNew list of peculiar velocities of RFGC
list of peculiar velocities for relativistic and semirelativistic models of galaxies’ motion.3SamplesObservational data were divided into several samparXiv:astro-ph/0510037vl 3 Oct 2005New list of peculiar velocities of RFGC galaxiess. L. Pamovsky and A. V. Ihgay39483Astronomical Observatory of Kyiv New list of peculiar velocities of RFGC nfined within the zone 0’ < Ổ < +38’ accessible to the radio telescope. There was no selection by the visible angular diameter, type, axes ratio ami ot her characteristics. We have not included in the summary t he flat galaxies from t he Supplement to FGC, which do not satisfy t he condition a/b > 7 New list of peculiar velocities of RFGC , ami also the galaxies with uncertain values of Il’ixo in accordance with the notes in the paper by Giovanelli et al. (1997). Our list contains 486 HNew list of peculiar velocities of RFGC
at galaxies from this paper.2.The observations of optical rotational curves made with the 6 III telescope of SAO HAS (Makarov el al.. 1997 a. b; 1999:arXiv:astro-ph/0510037vl 3 Oct 2005New list of peculiar velocities of RFGC galaxiess. L. Pamovsky and A. V. Ihgay39483Astronomical Observatory of Kyiv New list of peculiar velocities of RFGC imum rotational velocities were converted to WộQ by a relation derived through comparison of optical and radio observations of 59 galaxies common with sample “1” (Makarov et al., 1997a). 286 galaxies from these papers are included into our list.3.The data on radial velocities and hydrogen line width New list of peculiar velocities of RFGC s in the FGC galaxies identified with the RC3 catalogue (de Vaucoulcurs el al., 1991). In a few cases, where only H'-XI are available in RC3, they werNew list of peculiar velocities of RFGC
e converted to according to Karachentsev et al. (1993). This sample comprises flat galaxies all over the sky, a total of 162 objects.4.The data on HI arXiv:astro-ph/0510037vl 3 Oct 2005New list of peculiar velocities of RFGC galaxiess. L. Pamovsky and A. V. Ihgay39483Astronomical Observatory of Kyiv New list of peculiar velocities of RFGC th the lists by Mathewson er. al. (1992), Mathewson and Ford (1996). The optical data were converted to the widths Wfii> according to Mathewson and Ford (1996). The Sb Sd galaxies from the catalogue F.SO/I'ppsala (T-anberts. 1982) with angular dimensions a > I', inclinations i > 40”, and a galactic New list of peculiar velocities of RFGC latitude (|b|) > 11 ° have been included in the lists. As Mathewson et al. (1992) report, the data obtained with the 64m and 305m telescopes are in goNew list of peculiar velocities of RFGC
od agreement. Our sample contains 166 flat galaxies from these papers.Gọi ngay
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