Contents
Images
Upload your image
DSS Images Other Images
Related articles
The 2M++ galaxy redshift catalogue
Peculiar velocities arise from gravitational instability, and thus arelinked to the surrounding distribution of matter. In order to understandthe motion of the Local Group with respect to the cosmic microwavebackground, a deep all-sky map of the galaxy distribution is required.Here we present a new redshift compilation of 69 160 galaxies, dubbed2M++, to map large-scale structures of the local Universe over nearlythe whole sky, and reaching depths of K? 12.5, or 200 h-1Mpc. The target catalogue is based on the Two-Micron All-Sky SurveyExtended Source Catalog (2MASS-XSC). The primary sources of redshiftsare the 2MASS Redshift Survey, the 6dF galaxy redshift survey and theSloan Digital Sky Survey (Data Release 7). We assess redshiftcompleteness in each region and compute the weights required to correctfor redshift incompleteness and apparent magnitude limits, and discusscorrections for incompleteness in the zone of avoidance. We present thedensity field for this survey, and discuss the importance of large-scalestructures such as the Shapley Concentration.
| Relationship of galaxies from the second Byurakan survey to Zwicky clusters. II. Discussion
Not Available
| The anisotropic distribution of satellite galaxies
We identify satellites of isolated galaxies in the Sloan Digital SkySurvey and examine their angular distribution. Using mock cataloguesgenerated from cosmological N-body simulations, we demonstrate that theselection criteria used to select isolated galaxies and their satellitesin large galaxy redshift surveys must be very strict in order tocorrectly identify systems in which the primary galaxy dominates itsenvironment. We demonstrate that the criteria used in many previousstudies instead select predominantly group members. We refine a set ofselection criteria for which the group contamination is estimated to beless than 7per cent and present a catalogue of the resulting sample.The angular distribution of satellites about their host is biasedtowards the major axes for spheroidal galaxies and probably also for reddisc galaxies (the `intermediate' class of Bailin & Harris), but isisotropic for blue disc galaxies, i.e. it is the colour of the host thatdetermines the distribution of its satellites rather than itsmorphology. The similar anisotropy measured in this study to studiesthat were dominated by groups implies that group-specific processes arenot responsible for the angular distribution. Satellites that are mostlikely to have been recently accreted, late-type galaxies at largeprojected radii, show a tendency to lie along the same axis as thesurrounding large-scale structure. The orientations of isolated early-and intermediate-type galaxies also align with the surroundinglarge-scale structures.We discuss the origin of the anisotropic satellite distribution andconsider the implications of our results, critically assessing therespective roles played by the orientation of the visible galaxy withinits dark matter halo, anisotropic accretion of satellites from thelarger scale environment, and the biased nature of satellites as tracersof the underlying dark matter subhalo population.
| The relation of Second Byurakan Survey galaxies with Zwicky clusters. I. Data
In the region of the sky covered by both the Second Byurakan Survey(SBS) and the Zwicky Catalog of Galaxies and Clusters of Galaxies (CGCG)892 of the 1677 active galaxies lie within the contours of Zwickyclusters. Data on these galaxies and the corresponding clusters arelisted in tables according to whether they are actual, probable, orrandom members of clusters or are projected on them.
| The Second Byurakan Survey. General Catalogue
The Second Byurakan Survey (SBS) General Catalogue is presented. TheSBS, a continuation of the Markarian survey reaching fainter limitingmagnitudes, is the first survey which combines the search of galaxiesand QSOs. A total area of 991OS#square;degrees of the Northern sky wascovered with the use of three objective prisms in combination withSchott filters. The limited magnitude on the best plates reached B ~19.5.The General Catalogue consists of 3563 objects presented in two parts: aCatalogue of galaxies (1863 objects) and one of stellar objects (1700objects). The Catalogue of SBS AGN consists of 761 objects (155 SyG, 596QSOs, and 10 BLLac). Multi-wavelength data are presented for 1438 SBSobjects identified with X-ray, IRAS and FIRST sources.Spectrophotometric observations obtained over 26 years are available for3132 objects. Redshifts were measured for ~ 2100 extragalactic objects.Spectral classification is presented for ~ 2970 objects. The majority ofthe data is presented here for the first time. The Catalogue presentsnew large homogeneous deep representative complete samples of brightQSOs, AGNs, and faint UVX galaxies in the Northern sky. The SBS sampleis found to be complete at 70% for galaxies and ~ 85% for AGN/QSOs withB ≤ 17.5.
| Hubble Constant at Intermediate Redshift Using the CO-Line Tully-Fisher Relation
We have determined distances and Hubble ratios for galaxies atintermediate redshifts, cz ~ 10000 to 35000 km s-1, byapplying the CO-line Tully-Fisher relation to our 12CO(J=1-0)--line observations using the Nobeyama 45-m telescope, and near-IR (NIR)photometry in the J- and H-bands using the 1.88-m telescope at OkayamaAstrophysical Observatory. By averaging the Hubble ratios from the -bandresult, we obtained a Hubble constant of H0=60+/-10kms-1 Mpc-1. We argue that the CO line-NIRTully-Fisher relation can be a complimentary method to the other methodsfor measuring the distances of galaxies at intermediate and highredshifts.
| Accurate optical positions for 2978 objects from the Second Byurakan Survey (SBS) with the Digitized Sky Survey
Optical positions of 2978 objects listed in the Second Byurakan Survey(SBS) were obtained using the Digitized Sky Survey (DSS), and are givenwith an rms uncertainty ~ 1 arcsec in each coordinate. Tables 1 and 2are only available in electronic form at the CDS via anonymous ftp130.79.128.5 or via http://cdsweb.u-strasbg.fr/Abstract.html
| CO Observations of Luminous IR Galaxies at Intermediate Redshift
We present new measurements of the 12CO (J=1-0) emission from16 luminous infrared galaxies (LIGs) at intermediate redshift (cz ~10000-50000 km s-1). These new data were selected by isolatedand normal morphology. Although there already exist measurements of COemission from LIGs in the literature, they are mostly stronglyinteracting/merging systems. The new CO data represent an important newaddition to the literature in that they both expand the relatively smallnumber of samples of LIGs measured in CO, and they include aninteresting subset of LIGs that were selected based on isolated andnormal morphology. The CO observations were performed using the NRO 45-mtelescope. >From measurements of the CO emission and the IRASdatabase, we discuss the molecular gas and dust properties of late-typegalaxies at intermediate redshift. Comparisons of the CO and dustproperties of the new result with those from other CO measurements haverevealed the characteristics of this sample: (1) It shows the deepest COobservations of IRAS galaxies at intermediate redshift without anystrong interaction features. (2) It has typical properties of normalIRAS galaxies in terms of star-formation efficiency, color-colordiagrams and galactic nuclear activity. (3) It has a smaller gas-to-dustratio than normal IRAS galaxies. This can be explained by atwo-component dust model; our sample consists of mostly warm dust.
| The PSCz catalogue
We present the catalogue, mask, redshift data and selection function forthe PSCz survey of 15411 IRAS galaxies across 84per cent of the sky.Most of the IRAS data are taken from the Point Source Catalog, but thishas been supplemented and corrected in various ways to improve thecompleteness and uniformity. We quantify the known imperfections in thecatalogue, and we assess the overall uniformity, completeness and dataquality. We find that overall the catalogue is complete and uniform towithin a few per cent at high latitudes and 10per cent at low latitudes.Ancillary information, access details, guidelines and caveats for usingthe catalogue are given.
| The Updated Zwicky Catalog (UZC)
The Zwicky Catalog of galaxies (ZC), with m_Zw<=15.5, has been thebasis for the Center for Astrophysics (CfA) redshift surveys. To date,analyses of the ZC and redshift surveys based on it have relied onheterogeneous sets of galaxy coordinates and redshifts. Here we correctsome of the inadequacies of previous catalogs by providing (1)coordinates with <~2" errors for all of the 19,369 catalog galaxies,(2) homogeneously estimated redshifts for the majority (98%) of the datataken at the CfA (14,632 spectra), and (3) an estimate of the remaining``blunder'' rate for both the CfA redshifts and for those compiled fromthe literature. For the reanalyzed CfA data we include a calibrated,uniformly determined error and an indication of the presence of emissionlines in each spectrum. We provide redshifts for 7257 galaxies in theCfA2 redshift survey not previously published; for another 5625 CfAredshifts we list the remeasured or uniformly rereduced value. Among ournew measurements, 1807 are members of UZC ``multiplets'' associated withthe original Zwicky catalog position in the coordinate range where thecatalog is 98% complete. These multiplets provide new candidates forexamination of tidal interactions among galaxies. All of the newredshifts correspond to UZC galaxies with properties recorded in the CfAredshift compilation known as ZCAT. About 1000 of our new measurementswere motivated either by inadequate signal-to-noise in the originalspectrum or by an ambiguous identification of the galaxy associated witha ZCAT redshift. The redshift catalog we include here is ~96% completeto m_Zw<=15.5 and ~98% complete (12,925 galaxies out of a total of13,150) for the right ascension ranges 20^h>=alpha_1950<=4^h and8^h>=alpha_1950<=17^h and declination range-2.5d<=delta_1950<=50^deg. This more complete region includes allof the CfA2 survey as analyzed to date. The Great Wall structurepersists throughout the northern survey region. Dedicated to the memoryof Jim Peters, whose friendship, skill, and dedication were essential tothis work.
| Total magnitude, radius, colour indices, colour gradients and photometric type of galaxies
We present a catalogue of aperture photometry of galaxies, in UBVRI,assembled from three different origins: (i) an update of the catalogueof Buta et al. (1995) (ii) published photometric profiles and (iii)aperture photometry performed on CCD images. We explored different setsof growth curves to fit these data: (i) The Sersic law, (ii) The net ofgrowth curves used for the preparation of the RC3 and (iii) A linearinterpolation between the de Vaucouleurs (r(1/4) ) and exponential laws.Finally we adopted the latter solution. Fitting these growth curves, wederive (1) the total magnitude, (2) the effective radius, (3) the colourindices and (4) gradients and (5) the photometric type of 5169 galaxies.The photometric type is defined to statistically match the revisedmorphologic type and parametrizes the shape of the growth curve. It iscoded from -9, for very concentrated galaxies, to +10, for diffusegalaxies. Based in part on observations collected at the Haute-ProvenceObservatory.
| Distance Measurement of Galaxies to a Redshift of ~ 0.1 Using the CO-Line Tully-Fisher Relation
We report on the first results of a long-term project to derive thedistances of galaxies at cosmological distances by applying the CO-linewidth--luminosity relation. We have obtained deep CO-line observationsof galaxies at redshifts of up to cz ~ 29000 km s(-1) using the Nobeyama45-m mm-wave telescope; also, some supplementary data were obtainedusing the IRAM 30-m telescope. We have detected CO-line emission fromseveral galaxies, and used their CO-line widths to estimate the absoluteluminosities based on the line-width--luminosity relation. In order toobtain photometric data and an inclination correction, we also performedoptical imaging observations of the CO-detected galaxies using the CFHT3.6-m telescope at high resolution. The radio and optical data have beencombined to derive the distance moduli and distances of the galaxies;also, the Hubble ratios were estimated for these galaxies. We proposethat the CO-line width--luminosity relation can be a powerful method toderive the distances of galaxies to redfhifts of z ~ 0.1, and to derivethe Hubble ratio within a significant volume of the universe.
| An image database. II. Catalogue between δ=-30deg and δ=70deg.
A preliminary list of 68.040 galaxies was built from extraction of35.841 digitized images of the Palomar Sky Survey (Paper I). For eachgalaxy, the basic parameters are obtained: coordinates, diameter, axisratio, total magnitude, position angle. On this preliminary list, weapply severe selection rules to get a catalog of 28.000 galaxies, wellidentified and well documented. For each parameter, a comparison is madewith standard measurements. The accuracy of the raw photometricparameters is quite good despite of the simplicity of the method.Without any local correction, the standard error on the total magnitudeis about 0.5 magnitude up to a total magnitude of B_T_=17. Significantsecondary effects are detected concerning the magnitudes: distance toplate center effect and air-mass effect.
| The second Byurakan spectral sky survey. VI. The results of the area centered on alpha = 09 H 47 m, delta = +51 00'.
Not Available
| Photometry of Zwicky compact galaxies
The class of Zwicky compact galaxies (ZCGs) with sharp emission lines isshown by the present aperture UBVRI photometry for 80 ZCGs to have thesame color indices as the Markarian galaxies, as well as the bluecompact dwarf and irregular galaxies in the Virgo cluster; it isaccordingly suggested that they define a family, with differences amongindividuals being primarily due to their different star formationactivity status. The ZCGs without emission lines and with U-V greaterthan 0.4 have color indices similar to those of normal ellipticalgalaxies and, consequently, similar stellar contents.
| Photoelectric Observations of Interacting and Compact Galaxies
Not Available
| Empirical Properties of the Mass Discrepancy in Groups and Clusters of Galaxies.IV. Double Compact Galaxies
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1974ApJ...194...21C&db_key=AST
| On the Masses of Compact Galaxies
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1971PASP...83..202C&db_key=AST
|
Submit a new article
Related links
Submit a new link
Member of following groups:
|
Observation and Astrometry data
Catalogs and designations:
|
