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- ID:
- ivo://CDS.VizieR/J/MNRAS/383/445
- Title:
- Radial velocities in the Norma cluster (A3627)
- Short Name:
- J/MNRAS/383/445
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- A detailed dynamical analysis of the nearby rich Norma cluster (ACO 3627) is presented. From radial velocities of 296 cluster members, we find a mean velocity of 4871+/-54km/s and a velocity dispersion of 925km/s. The mean velocity of the E/S0 population (4979+/-85km/s) is offset with respect to that of the S/Irr population (4812+/-70km/s) by {Delta}v=164km/s in the cluster rest frame. This offset increases towards the core of the cluster. The E/S0 population is free of any detectable substructure and appears relaxed. Its shape is clearly elongated with a position angle that is aligned along the dominant large-scale structures in this region, the so-called Norma wall. The central cD galaxy has a very large peculiar velocity of 561km/s which is most probably related to an ongoing merger at the core of the cluster.
- ID:
- ivo://CDS.VizieR/J/AJ/139/216
- Title:
- Radial velocities in UGC 842 and NGC 6034
- Short Name:
- J/AJ/139/216
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present a new insight on NGC 6034 and UGC 842, two groups of galaxies previously reported in the literature as being fossil groups. The study is based on optical photometry and spectroscopy obtained with the CTIO Blanco telescope and Sloan Digital Sky Survey archival data.
- ID:
- ivo://CDS.VizieR/J/A+A/469/861
- Title:
- Radial velocities of A115 galaxies
- Short Name:
- J/A+A/469/861
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present the results of a new spectroscopic and photometric survey of the hot, binary X-ray cluster A115 at z=0.193, containing a radio relic. Our analysis is based on new spectroscopic data obtained at the Telescopio Nazionale Galileo for 115 galaxies and on new photometric data obtained at the Isaac Newton Telescope in a large field. We combine galaxy velocity and position information to select 85 galaxies recognized as cluster members, determine global dynamical properties and detect substructures.
- ID:
- ivo://CDS.VizieR/J/A+A/416/839
- Title:
- Radial velocities of A2219 galaxies
- Short Name:
- J/A+A/416/839
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present the results of the dynamical analysis of the rich, hot, and X-ray very luminous galaxy cluster A2219, containing a powerful diffuse radio-halo. Our analysis is based on new redshift data for 27 galaxies in the cluster region, measured from spectra obtained at the Telescopio Nazionale Galileo (TNG), with the addition of other 105 galaxies recovered from reduction of CFHT archive data in a cluster region of about 5-arcmin radius (about 0.8Mpc/h at the cluster distance) centered on the cD galaxy. The investigation of the dynamical status is also performed by using X-ray data stored in the Chandra archive. Further, valuable information comes from other bands - optical photometric, infrared, and radio data - which are analyzed and/or discussed, too. Our analyses support the view of the connection between extended radio emission and merging phenomena in galaxy clusters.
- ID:
- ivo://CDS.VizieR/J/AJ/130/957
- Title:
- Radial velocities of 6dF galaxies
- Short Name:
- J/AJ/130/957
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present 546 optical redshifts obtained for galaxies in the region of the Horologium-Reticulum supercluster (HRS) using the 6{deg} field (6dF) multifiber spectrograph on the UK Schmidt Telescope at the Anglo-Australian Observatory. The HRS covers an area of more than 12{deg}x12{deg} on the sky centered at approximately RA=03h19m, DE=-50{deg}02'.
- ID:
- ivo://CDS.VizieR/J/A+A/455/45
- Title:
- Radial velocities of 93 galaxies in Abell 697
- Short Name:
- J/A+A/455/45
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We conduct an intensive study of the rich, X-ray luminous, and hot galaxy cluster Abell 697 (at z=0.282), likely containing a diffuse radio-emission, to determine its dynamical status. Our analysis is based on new spectroscopic data obtained at the TNG telescope for 93 galaxies and on new photometric data obtained at the INT telescope in a large field. We combine galaxy velocity and position information to select 68 cluster members (out to ~1.3h_70_^-1^Mpc from the cD galaxy), determine global dynamical properties, and detect possible substructures. The investigation of the dynamical status is also performed by using X-ray data stored in the Chandra archive.
- ID:
- ivo://CDS.VizieR/J/MNRAS/456/2829
- Title:
- Radial velocities of galaxies in A523 field
- Short Name:
- J/MNRAS/456/2829
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We study the structure of the galaxy cluster Abell 523 (A523) at z=0.104 using new spectroscopic data for 132 galaxies acquired at the Telescopio Nazionale Galileo, new photometric data from the Isaac Newton Telescope, and X-ray and radio data from the Chandra and Very Large Array archives. We estimate the velocity dispersion of the galaxy population, {sigma}_V_=949_-60_^+80^km/s, and the X-ray temperature of the hot intracluster medium, kT=5.3+/-0.3keV. We infer that A523 is a massive system: M_200_~7-9x10^14^M_{sun}_. The analysis of the optical data confirms the presence of two subclusters, 0.75Mpc apart, tracing the SSW-NNE direction and dominated by the two brightest cluster galaxies (BCG1 and BCG2). The X-ray surface brightness is strongly elongated towards the NNE direction, and its peak is clearly offset from both the brightest cluster galaxies (BCGs). We confirm the presence of a 1.3Mpc large radio halo, elongated in the ESE-WNW direction and perpendicular to the optical/X-ray elongation. We detect a significant radio/X-ray offset and radio polarization, two features which might be the result of a magnetic field energy spread on large spatial scales. A523 is found consistent with most scaling relations followed by clusters hosting radio haloes, but quite peculiar in the P_radio_-L_X_ relation: it is underluminous in the X-rays or overluminous in radio. A523 can be described as a binary head-on merger caught after a collision along the SSW-NNE direction. However, minor optical and radio features suggest a more complex cluster structure, with A523 forming at the crossing of two filaments along the SSW-NNE and ESE-WNW directions.
- ID:
- ivo://CDS.VizieR/J/A+A/383/823
- Title:
- Radial velocities of UCOs in Fornax
- Short Name:
- J/A+A/383/823
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The relation between the Ultra Compact Objects (hereafter UCOs) recently discovered in the Fornax cluster (Drinkwater et al., 2000PASA...17..227D; Hilker et al., 1999, Cat. <J/A+AS/134/75>) and the brightest globular clusters associated with the central galaxy NGC 1399 has been investigated. A spectroscopic survey on compact objects in the central region of the Fornax cluster was carried out with the 2.5 m du Pont telescope (LCO) at Las Campanas, in the three nights of 2000/12/30 to 2001/01/01. The magnitude limit was approx. V=21 mag, the spectral resolution approx. 4{AA}. UCOs and the bright NGC 1399 globular clusters with similar brightness were inspected. 12 GCs from the bright end of the globular cluster luminosity function have been identified as Fornax members. Eight are new members, four were known as members from before.
- ID:
- ivo://CDS.VizieR/J/ApJ/581/844
- Title:
- Radio and Infrared observations of EROs
- Short Name:
- J/ApJ/581/844
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present the results from a sensitive multiwavelength analysis of the properties of extremely red objects (EROs). Our analysis employs deep RIzJHK photometry of an 8.5'x8.5' region to select a sample of 68 EROs with (R-K)>=5.3 and brighter than K=20.5 (5{sigma}). We combine this photometric data set with an extremely deep 1.4GHz radio map of the field obtained from the VLA. This map reaches a 1{sigma} limiting flux density of 3.5{mu}Jy , making it the deepest 1.4GHz map taken, and is sensitive enough to detect an active galaxy with L1.4>~10^23^W/Hz at z>1.
