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3161. Compact Groups in the UZC galaxy sample
ID:
ivo://CDS.VizieR/J/A+A/391/35
Title:
Compact Groups in the UZC galaxy sample
Short Name:
J/A+A/391/35
Date:
21 Oct 2021
Publisher:
CDS
Description:
Applying an automatic neighbour search algorithm to the 3D UZC galaxy catalogue (Falco et al., 1999, Cat. <J/PASP/111/438>) we have identified 291 compact groups (CGs) with radial velocity between 1000 and 10000km/s. The sample is analysed to investigate whether Triplets display kinematical and morphological characteristics similar to higher order CGs (Multiplets). It is found that Triplets constitute low velocity dispersion structures, have a gas-rich galaxy population and are typically retrieved in sparse environments. Conversely Multiplets show higher velocity dispersion, include few gas-rich members and are generally embedded structures. Evidence hence emerges indicating that Triplets and Multiplets, though sharing a common scale, correspond to different galaxy systems. Triplets are typically field structures whilst Multiplets are mainly subclumps (either temporarily projected or collapsing) within larger structures. Simulations show that selection effects can only partially account for differences, but significant contamination of Triplets by field galaxy interlopers could eventually induce the observed dependences on multiplicity.
3162. Compact groups of compact galaxies
ID:
ivo://CDS.VizieR/VII/89B
Title:
Compact groups of compact galaxies
Short Name:
VII/89B
Date:
21 Oct 2021
Publisher:
CDS
Description:
The catalog is a compilation of ten published lists of compact groups of compact galaxies found on the Palomar Sky Survey red charts. The catalog contains 377 groups of compact galaxies and includes identifications, equatorial coordinates, numbers of constituent galaxies, magnitudes of the brightest member, sizes of the groups as a whole, and coefficients of relative compactness.
3163. Compact Groups of galaxies from 2MASX
ID:
ivo://CDS.VizieR/J/MNRAS/426/296
Title:
Compact Groups of galaxies from 2MASX
Short Name:
J/MNRAS/426/296
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present a photometric catalogue of compact groups of galaxies (p2MCGs) automatically extracted from the Two-Micron All Sky Survey (2MASS) extended source catalogue. A total of 262 p2MCGs are identified, following the criteria defined by Hickson, of which 230 survive visual inspection (given occasional galaxy fragmentation and blends in the 2MASS parent catalogue). Only one quarter of these 230 groups were previously known compact groups (CGs). Among the 144 p2MCGs that have all their galaxies with known redshifts, 85 (59%) have four or more accordant galaxies. This v2MCG sample of velocity-filtered p2MCGs constitutes the largest sample of CGs (with N>=4) catalogued to date, with both well-defined selection criteria and velocity filtering, and is the first CG sample selected by stellar mass. It is fairly complete up to K_group_~9 and radial velocity of ~6000km/s.
3164. Compact groups of galaxies from SDSS-DR12 (MLCG)
ID:
ivo://CDS.VizieR/J/ApJS/225/23
Title:
Compact groups of galaxies from SDSS-DR12 (MLCG)
Short Name:
J/ApJS/225/23
Date:
21 Oct 2021
Publisher:
CDS
Description:
We apply a friends-of-friends algorithm to an enhanced SDSS DR12 spectroscopic catalog, including redshift from the literature to construct a catalog of 1588 N>=3 compact groups of galaxies containing 5178 member galaxies and covering the redshift range 0.01<z<0.19. This catalog contains 18 times as many systems and reaches 3 times the depth of the similar catalog of Barton et al. (1996AJ....112..871B). We construct catalogs from both magnitude-limited and volume-limited galaxy samples. Like Barton et al. we omit the frequently applied isolation criterion in the compact group selection algorithm. Thus the groups selected by fixed projected spatial and rest-frame line-of-sight velocity separation produce a catalog of groups with a redshift-independent median size. In contrast to previous catalogs, the enhanced SDSS DR12 catalog (including galaxies with r<14.5) includes many systems with z<~0.05. The volume-limited samples are unique to this study. The compact group candidates in these samples have a median stellar mass independent of redshift. Groups with velocity dispersion <~100km/s show abundant evidence for ongoing dynamical interactions among the members. The number density of the volume-limited catalogs agrees with previous catalogs at the lowest redshifts but decreases as the redshift increases. The SDSS fiber placement constraints limit the catalog's completeness. In spite of this issue, the volume-limited catalogs provide a promising basis for detailed spatially resolved probes of the impact of galaxy-galaxy interactions within similar dense systems over a broad redshift range.
3165. Compact groups of galaxies in LCRS
ID:
ivo://CDS.VizieR/J/AN/321/101
Title:
Compact groups of galaxies in LCRS
Short Name:
J/AN/321/101
Date:
21 Oct 2021
Publisher:
CDS
Description:
We have recently extracted a catalog of compact groups of galaxies (CGs) from the Las Campanas Redshift Survey. This catalog of Las Campanas Compact Groups (LCCGs) contains 76 CGs with a median redshift of z_med_~0.08. The physical properties of these CGs are similar to those form Hickson (1982, Cat. <VII/213>) and the Barton et al. (1996AJ....112..871B) catalogs. Here, we present an atlas of our catalog and briefly describe its general properties.
3166. Compact groups of galaxies in SDSS DR6
ID:
ivo://CDS.VizieR/J/MNRAS/395/255
Title:
Compact groups of galaxies in SDSS DR6
Short Name:
J/MNRAS/395/255
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present the largest publicly available catalogue of compact groups (CGs) of galaxies identified using the original selection criteria of Hickson, selected from the Sixth Data Release of the Sloan Digital Sky Survey (SDSS DR6). We identify 2297 CGs down to a limiting magnitude of r=18 (~0.24groups/deg^2^), and 74791 CGs down to a limiting magnitude of r=21 (~6.7groups/deg^2^). This represents 0.9 per cent of all galaxies in the SDSS DR6 at these magnitude levels.
3167. Compact groups of galaxies in SDSS DR7
ID:
ivo://CDS.VizieR/J/MNRAS/418/1409
Title:
Compact groups of galaxies in SDSS DR7
Short Name:
J/MNRAS/418/1409
Date:
21 Oct 2021
Publisher:
CDS
Description:
We investigate the properties of photometrically selected compact groups (CGs) in the Sloan Digital Sky Survey. In this paper, the fourth in a series, we focus on understanding the characteristics of our observed CG sample with particular attention paid to quantifying and removing contamination from projected foreground or background galaxies. Based on a simple comparison of pairwise redshift likelihoods, we find that approximately half of CGs in the parent sample contain one or more projected (interloping) members; our final clean sample contains 4566 galaxies in 1086 CGs.
3168. Compact groups of galaxies in SDSS & LAMOST. I.
ID:
ivo://CDS.VizieR/J/ApJS/246/12
Title:
Compact groups of galaxies in SDSS & LAMOST. I.
Short Name:
J/ApJS/246/12
Date:
21 Oct 2021
Publisher:
CDS
Description:
A compact group (CG) is a kind of special galaxy system where the galaxy members are separated at distances of the order of galaxy size. The strong interaction between the galaxy members makes CGs ideal labs for studying the environmental effects on galaxy evolution. The traditional photometric selection algorithm biases against the CG candidates at low redshifts, while the spectroscopic identification technique is affected by the spectroscopic incompleteness of sample galaxies and typically biases against the high redshift candidates. In this study, we combine these two methods and select CGs in the main galaxy sample of the Sloan Digital Sky Survey, where we also have taken the advantages of the complementary redshift measurements from the LAMOST spectral and GAMA surveys. We have obtained the largest and most complete CG samples to date. Our samples include 6144 CGs and 8022 CG candidates, which are unique in the studies of the nature of the CGs and the evolution of the galaxies inside.
3169. Compact H I clouds from the GALFA-H I survey
ID:
ivo://CDS.VizieR/J/ApJ/722/395
Title:
Compact H I clouds from the GALFA-H I survey
Short Name:
J/ApJ/722/395
Date:
21 Oct 2021
Publisher:
CDS
Description:
The Galactic Arecibo L-band Feed Array H I (GALFA-H I) survey is mapping the entire Arecibo sky at 21 cm, over a velocity range of -700 to +700 km/s (LSR), at a velocity resolution of 0.18 km/s, and a spatial resolution of 3.5 arcmin. The unprecedented resolution and sensitivity of the GALFA-H I survey have resulted in the detection of numerous isolated, very compact H I clouds at low Galactic velocities, which are distinctly separated from the H I disk emission. In the limited area of ~4600 deg^2^ surveyed so far, we have detected 96 such compact clouds. The detected clouds are cold with a median T_k,max_ (the kinetic temperature in the case in which there is no non-thermal broadening) of 300 K. Moreover, these clouds are quite compact and faint, with median values of 5 arcmin in angular size, 0.75 K in peak brightness temperature, and 5x10^18^/cm2 in H I column density. Most of the clouds deviate from Galactic rotation at the 20-30 km/s level, and a significant fraction show evidence for a multiphase medium and velocity gradients. No counterparts for these clouds were found in other wave bands. From the modeling of spatial and velocity distributions of the whole compact cloud population, we find that the bulk of the compact clouds are related to the Galactic disk, and their distances are likely to be in the range of 0.1 to a few kpc. We discuss various possible scenarios for the formation and maintenance of this cloud population and its significance for Galactic interstellar medium studies.
3170. Compact high-velocity cloud photometry catalog
ID:
ivo://CDS.VizieR/J/ApJ/623/181
Title:
Compact high-velocity cloud photometry catalog
Short Name:
J/ApJ/623/181
Date:
21 Oct 2021
Publisher:
CDS
Description:
We report the results of a photometric search for giant stars associated with the cores of four high-velocity clouds (HVCs) - two of which are compact HVCs - using the Las Campanas du Pont 2.5m and Cerro Tololo Blanco 4m telescopes in combination with a system of filters (Washington M, T_2_ + DDO51) useful for identifying low surface gravity, evolved stars.

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