J/A+A/667/A66 Tri Aus and AS794 radial recessional velocities (Quintana+, 2022)
New insights into the Triangulum Australis supercluster of galaxies.
Quintana H., Proust D., Lacerna I., Bohringer H.
<Astron. Astrophys., 667, A66 (2022)>
=2022A&A...667A..66Q 2022A&A...667A..66Q (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, galaxy ; Galaxies, nearby ; Radial velocities ;
Optical
Keywords: galaxies: distances and redshifts
Abstract:
The Triangulum Australis cluster is one of about a dozen nearby
massive cluster systems which contribute to the gravitational pull
behind the so-called Great Attractor that is dominated by the nearby
Shapley Supercluster mass, which conforms the galaxy velocity flows
observed in that general direction. Here, we study the structure and
dynamical mass of the Triangulum Australis cluster together with the
neighbouring cluster AS0794. We present a set of 131 velocities
collected in the regions of the two clusters with the 2.5m Du Pont
telescope at Las Campanas Observatory (Chile). For the Triangulum
Australis cluster we find a dynamical mass of about
Mv=4.2(±1.3)x1015M☉ and for AS0794 a value of about
Mv=1.7(±1.3)x1013M☉. These values are consistent with the
observed X-ray luminosities of these clusters. Combined with
velocities already known we reanalyse the structure and dynamics of
this general region, finding that both clusters, together with at
least eight other ones, form a large supercluster, centered on Tri Aus
(which dominates in terms of mass). We find that this supercluster is
part of a large-scale structure filament linked to the Shapley
supercluster (SSC). Uncertainties remain on the richness and detailed
structure of this filament and the Tri Aus supercluster because parts
of it remain hidden behind the Galaxy disk.
Description:
The spectroscopic observations were carried out first using the fiber
spectrograph and then the WFCCD, both mounted on the 2.50m du Pont
telescope at Las Campanas Observatory (LCO), Chile.
From the observing runs, we obtained a set of 131 heliocentric radial
recessional velocities (some of them were observed two times)
belonging to the two clusters, namely: 76 for Tri Aus and 55 for
AS0794). Table A.1 lists the details of these new observations.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 73 131 The new heliocentric radial recessional
velocities catalogue in Tri Aus and AS794
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Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Cluster Cluster name
9- 10 I2 --- Seq Sequential number within the Cluster
12- 13 I2 h RAh Right ascension (J2000)
15- 16 I2 min RAm Right ascension (J2000)
18- 22 F5.2 s RAs Right ascension (J2000)
24 A1 --- DE- Declination sign (J2000)
25- 26 I2 deg DEd Declination (J2000)
28- 29 I2 arcmin DEm Declination (J2000)
31- 34 F4.1 arcsec DEs [0/60] Declination (J2000)
36- 40 I5 km/s HRV Heliocentric radial recessional velocity
42- 44 I3 km/s e_HRV Heliocentric radial recessional velocity error
46- 50 F5.2 --- R R value from Tonry & Davis (1979AJ.....84.1511T 1979AJ.....84.1511T)
52- 73 A22 --- Notes Notes
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 21-Feb-2023