- ID:
- ivo://CDS.VizieR/J/A+A/337/17
- Title:
- Redshift survey between A548 and A3367
- Short Name:
- J/A+A/337/17
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- In this paper we present the results of a spectroscopic survey of galaxies in an area between the two clusters of galaxies A548 and A3367, suspected to be a close and interacting pair. With the use of multifiber spectroscopy, we measured 180 new velocities of galaxies in the central part of A 3367 and in the external regions of A 548. The redshift histogram shows the presence of three velocity peaks, at v~12000km/s, v~30000km/s and v~40000km/s, respectively. For these we estimate the density excess, the mean velocity, and the velocity dispersion. The first clump corresponds to an elongation of A 548: in particular we found a correspondence between the features of this peak and the substructures of A 548. The second peak has a velocity dispersion which is typical of clusters and the distribution of its members on the plane of the sky corresponds to the highest density peak in A 3367. We therefore suggest that the name A 3367 has to be attributed to this clump. Our general conclusion is that, differently from expected, A 548 and A 3367 do not form a close pair of merging clusters, since the two structures are at significantly different redshifts. Moreover, we found that the complex dynamical structure of A 548 has large coherence, with a projected extension in the range of 1-3h^-1^Mpc.
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Search Results
- ID:
- ivo://CDS.VizieR/J/AJ/116/1573
- Title:
- Redshift Survey Compact Groups
- Short Name:
- J/AJ/116/1573
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Redshift Survey Compact Groups (RSCGs) are tight knots of N>=3 galaxies selected from the CfA2+SSRS2 redshift survey. The selection is based on physical extent and association in redshift space alone. We measured 300 new redshifts of fainter galaxies within 1h^-1^Mpc of 14 RSCGs to explore the relationship between RSCGs and their environments. Thirteen of 14 RSCGs are embedded in overdense regions of redshift space. The systems range from a loose group of five members to an Abell cluster. The remaining group, RSCG 64, appears isolated. RSCGs are isolated and distinct from their surroundings to varying degrees, as are the Hickson compact groups. Among the 13 embedded RSCGs, three are distinct from their general environments (RSCG 9, RSCG 11, and RSCG 85).
- ID:
- ivo://CDS.VizieR/J/ApJS/112/245
- Title:
- Redshift survey for IRAS galaxies
- Short Name:
- J/ApJS/112/245
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- This is the third and final paper (Yamada et al., 1993ApJS...89...57Y and Takata et al., Cat. <J/A+AS/104/529>) of our systematic visual search for IRAS galaxies behind the Milky Way at |b|<=15{deg}. This paper presents a catalog of 950 IRAS galaxies with 60{mu}m flux densities larger than 0.6Jy located between l=0{deg} and 150{deg}, of which 293 are newly identified by this search. We made a redshift survey for the identified galaxies and obtained new redshift data of 171 galaxies. We also present newly measured redshifts of 27 IRAS galaxies between l=150{deg} and 225{deg} at |b|<=15{deg}. In this paper we studied the structure of the Local void using IRAS galaxies and galaxies from the Third Reference Catalogue of Bright Galaxies (Cat. <VII/155>) in the region l=30{deg}-120{deg} and b=-50{deg} to +30{deg}. The center of the Local void turned out to be located at l~60{deg}, b~-15{deg}, and cz~2500km/s, and the size is about 2500km/s along the direction toward the center.
- ID:
- ivo://CDS.VizieR/J/ApJ/665/921
- Title:
- Redshift survey in the field of A1689
- Short Name:
- J/ApJ/665/921
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present results of the HST Advanced Camera for Surveys spectroscopic ground-based redshift survey in the field of A1689. We measure 98 redshifts, increasing the number of spectroscopically confirmed objects sixfold. We present two spectra from this catalog of the Sextet Arcs, images that arise from a strongly lensed Lyman break galaxy (LBG) at a redshift of z=3.038. Gravitational lensing by the cluster magnifies its flux by a factor of ~16 and produces six separate images with a total r-band magnitude of r_625_=21.7. The two spectra, each of which represents emission from different regions of the LBG, show HI and interstellar metal absorption lines at the systemic redshift.
- ID:
- ivo://CDS.VizieR/J/ApJ/750/168
- Title:
- Redshift survey in the Subaru GTO2deg^2^ field
- Short Name:
- J/ApJ/750/168
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We use a dense redshift survey in the foreground of the Subaru GTO2deg^2^ weak-lensing field (centered at 16:04:44+43:11'24 (2000) to assess the completeness and comment on the purity of massive halo identification in the weak-lensing map. The redshift survey (published here) includes 4541 galaxies; 4405 are new redshifts measured with the Hectospec on the MMT. Among the weak-lensing peaks with a signal to noise greater than 4.25, 2/3 correspond to individual massive systems; this result is essentially identical to the Geller et al. (2010ApJ...709..832G) test of the Deep Lens Survey (DLS) field F2. The Subaru map, based on images in substantially better seeing than the DLS, enables detection of less massive halos at fixed redshift as expected. We demonstrate that the procedure adopted by Miyazaki et al. (2002ApJ...580L..97M) for removing some contaminated peaks from the weak-lensing map improves agreement between the lensing map and the redshift survey in the identification of candidate massive systems.
- ID:
- ivo://CDS.VizieR/J/AJ/162/193
- Title:
- Redshift survey nearby galaxy cluster A2626
- Short Name:
- J/AJ/162/193
- Date:
- 16 Mar 2022 00:18:57
- Publisher:
- CDS
- Description:
- New MMT/Hectospec spectroscopy centered on the galaxy cluster A2626 and covering a ~1.8deg^2^ area out to z~0.46 more than doubles the number of galaxy redshifts in this region. The spectra confirm four clusters previously identified photometrically. A2625, which was previously thought to be a close neighbor of A2626, is in fact much more distant. The new data show six substructures associated with A2626 and five more associated with A2637. There is also a highly collimated collection of galaxies and galaxy groups between A2626 and A2637 having at least three and probably four substructures. At larger scales, the A2626-A2637 complex is not connected to the Pegasus-Perseus filament.
- ID:
- ivo://CDS.VizieR/J/ApJ/840/78
- Title:
- Redshift survey of ALMA-identified SMGs in ECDFS
- Short Name:
- J/ApJ/840/78
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present spectroscopic redshifts of S_870{mu}m_>~2mJy submillimeter galaxies (SMGs), which have been identified from the ALMA follow-up observations of 870{mu}m detected sources in the Extended Chandra Deep Field South (the ALMA-LESS survey). We derive spectroscopic redshifts for 52 SMGs, with a median of z=2.4+/-0.1. However, the distribution features a high-redshift tail, with ~23% of the SMGs at z>=3. Spectral diagnostics suggest that the SMGs are young starbursts, and the velocity offsets between the nebular emission and UV ISM absorption lines suggest that many are driving winds, with velocity offsets of up to 2000km/s. Using the spectroscopic redshifts and the extensive UV-to-radio photometry in this field, we produce optimized spectral energy distributions (SEDs) using Magphys, and use the SEDs to infer a median stellar mass of M_*_=(6+/-1)x10^10^M_{sun}_ for our SMGs with spectroscopic redshift. By combining these stellar masses with the star formation rates (measured from the far-infrared SEDs), we show that SMGs (on average) lie a factor of ~5 above the so-called "main sequence" at z~2. We provide this library of 52 template fits with robust and uniquely well-sampled SEDs as a resource for future studies of SMGs, and also release the spectroscopic catalog of ~2000 (mostly infrared-selected) galaxies targeted as part of the spectroscopic campaign.
- ID:
- ivo://CDS.VizieR/J/ApJ/607/202
- Title:
- Redshift survey of nearby galaxy groups
- Short Name:
- J/ApJ/607/202
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We constrain the mass profile and orbital structure of nearby groups and clusters of galaxies. Our method yields the joint probability distribution of the density slope n, the velocity anisotropy {beta}, and the turnover radius r_0_ for these systems. The measurement technique does not use results from N-body simulations as priors. We incorporate 2419 new redshifts (included here) in the fields of 41 systems of galaxies with z<0.04.
- ID:
- ivo://CDS.VizieR/J/ApJ/622/772
- Title:
- Redshift survey of submillimeter galaxies
- Short Name:
- J/ApJ/622/772
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We have obtained spectroscopic redshifts using the Keck I telescope for a sample of 76 submillimeter galaxies (SMGs), with a median 850{mu}m flux density of 5.7mJy, for which precise positions are available through their faint radio emission.
- ID:
- ivo://CDS.VizieR/J/ApJ/869/124
- Title:
- Redshift survey of the nearby galaxy cluster A2107
- Short Name:
- J/ApJ/869/124
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We study the rotational motion of the galaxy cluster A2107 at redshift z=0.04 and its connection to nearby large-scale structures using a large amount of spectroscopic redshift data. By combining 978 new redshifts from the MMT/Hectospec observations with data in the literature, we construct a large sample of 1968 galaxies with measured redshifts at clustercentric radius R<60'. Our sample has high (80%) and spatially uniform completeness at r-band apparent magnitude m_r,Petro,0_<19.1. We first apply the caustic method to the sample and identify 285 member galaxies of A2107 at R<60'. Then the rotation amplitude and the position angle of the rotation axis are measured. We find that the member galaxies show strong global rotation at R<20' (v_rot_/{sigma}_v_~0.6) with a significance of >3.8{sigma}, which is confirmed by two independent methods. The rotation becomes weaker in outer regions. There are at least five filamentary structures that are connected to the cluster and that consist of known galaxy groups. These structures are smoothly connected to the cluster, which seem to be inducing the global rotation of the cluster through inflow of galaxies.
