21 cm Synthesis Observations of VIRGOHI 21—A Possible Dark Galaxy in the Virgo Cluster

@article{Minchin200721CS,
  title={21 cm Synthesis Observations of VIRGOHI 21—A Possible Dark Galaxy in the Virgo Cluster},
  author={Robert. F. Minchin and Jonathan Ivor Davies and Michael John Disney and Marco Grossi and Sabina Sabatini and Peter J. Boyce and Diego Garcia and Christopher D. Impey and Christine A. Jordan and Robert Lang and Andrew Robert Marble and Sarah Roberts and Wim van Driel Arecibo Observatory and Cardiff University and Osservatorio Astrofisico di Arcetri and Osservatorio Astronomico di Roma and University of Bonn and Steward Observatory and Jodrell Bank Observatory and Observatoire de Paris},
  journal={The Astrophysical Journal},
  year={2007},
  volume={670},
  pages={1056 - 1064}
}
Many observations indicate that dark matter dominates the extragalactic universe, yet no totally dark structure of galactic proportions has ever been convincingly identified. Previously, we have suggested that VIRGOHI 21, a 21 cm source we found in the Virgo Cluster using Jodrell Bank, was a possible dark galaxy because of its broad line width (~200 km s-1) unaccompanied by any visible gravitational source to account for it. We have now imaged VIRGOHI 21 in the neutral hydrogen line and find… 

The Widefield Arecibo Virgo Extragalactic Survey. I. New Structures in the ALFALFA Virgo 7 Cloud Complex and an Extended Tail on NGC 4522

We are carrying out a sensitive blind survey for neutral hydrogen (H i) in the Virgo cluster and report here on the first 5° × 1° area covered, which includes two optically dark gas features: the

Swift XRT Observations of the Possible Dark Galaxy VIRGOHI 21

Swift XRT observations of the H I line source VIRGOHI 21 were performed on 2008 April 22 and 26 for a total exposure time of 9.2 ks. This is the first pointed X-ray observation of VIRGOHI 21, a

Tidal Debris from High-Velocity Collisions as Fake Dark Galaxies: A Numerical Model of VIRGOHI 21

High-speed collisions, although current in clusters of galaxies, have long been neglected, as they are believed to cause little damages to galaxies except when they are repeated, a process called

H i observations of galaxies in the southern filament of the Virgo Cluster with the Square Kilometre Array Pathfinder KAT-7 and the Westerbork Synthesis Radio Telescope

We map the H I distribution of galaxies in a ˜1.5 × 2.5° region located at the virial radius south of the Virgo Cluster using the KAT-7 and the Westerbork Synthesis Radio Telescope interferometers.

Do micro brown dwarf detections explain the galactic dark matter

The baryonic dark matter dominating the structures of galaxies is widely considered as mysterious, but hints for it have been in fact detected in several astronomical observations at optical,

Deep optical imaging of the dark galaxy candidate AGESVC1 282

The blind H Isurvey Arecibo Galaxy Environment Survey (AGES) detected several unresolved sources in the Virgo cluster, which do not have optical counterparts in the Sloan Digital Sky Survey. The

PREDICTED SIZES OF PRESSURE-SUPPORTED HI CLOUDS IN THE OUTSKIRTS OF THE VIRGO CLUSTER

Using data from the ALFALFA AGES Arecibo HI survey of galaxies and the Virgo cluster X-ray pressure profiles from XMM-Newton, we investigate the possibility that starless dark HI clumps, also known

The Invisible Hand: Star Formation Triggered by Runaway Black Holes

The presence of intergalactic star-forming regions within galaxy clusters shows that stars may form well away from a host galaxy. On larger scales, the existence of distorted isolated galaxies

THE ARECIBO LEGACY FAST ALFA SURVEY. VII. A NEUTRAL HYDROGEN CLOUD COMPLEX IN THE VIRGO CLUSTER

We present observations of an H i cloud complex most likely located in the Virgo galaxy cluster, first reported by Kent et al. The complex consists of five clouds, detected in the dataset of the

THE ALFALFA “ALMOST DARKS” CAMPAIGN: PILOT VLA HI OBSERVATIONS OF FIVE HIGH MASS-TO-LIGHT RATIO SYSTEMS

We present new Very Large Array (VLA) H i spectral line imaging of five sources discovered by the ALFALFA extragalactic survey. These targets are drawn from a larger sample of systems that were not

References

SHOWING 1-10 OF 37 REFERENCES

A Dark Hydrogen Cloud in the Virgo Cluster

VIRGOHI 21 is an H I source detected in the Virgo Cluster survey of Davies et al. that has a neutral hydrogen mass of 108 M☉ and a velocity width of ΔV20 = 220 km s-1. From the Tully-Fisher relation,

Did VV 29 collide with a dark Dark-Matter halo?

Westerbork Radio Synthesis Telescope observation of the galaxy VV 29 = Arp 188 = UGC 10214 shows that there are at least three distinct dynamical components whose kinematics can be traced in 21 cm

The existence and detection of optically dark galaxies by 21-cm surveys

One explanation for the disparity between cold dark matter (CDM) predictions of galaxy numbers and observations could be that there are numerous dark galaxies in the Universe. These galaxies may

Intracluster Red Giant Stars in the Virgo Cluster

We have used the Wide Field Planetary Camera 2 on the Hubble Space Telescope to obtain deep F814W images of a blank field in the Virgo Cluster located 41' northwest of M87. We perform star counts in

NGC 4254: a spiral galaxy entering the Virgo cluster

Deep Effelsberg H spectra of the one-armed, bright Virgo cluster spiral galaxy NGC 4254 are presented. Five dif- ferent positions were observed in the 21 cm H line with the Effelsberg 100-m

On Star Formation and the Nonexistence of Dark Galaxies

We investigate whether a baryonic dark galaxy or "galaxy without stars" could persist indefinitely in the local universe, while remaining stable against star formation. To this end, a simple model

The stellar mass to light ratio in the isolated spiral NGC 4414

We present high resolution CO(1-0) interferometric observations and deep HST B - V - I images of the flocculent isolated Sc type spiral NGC 4414. The goal is to determine the stellar mass-to-light

H i observations of interacting galaxy pair NGC 4038/9

We present the results of new radio interferometer Hi line observations for the merging galaxy pair NGC 4038/9 ('The Antennae'), obtained using the Australia Telescope Compact Array. The results

NGC 4254: A Spiral Galaxy with an M = 1 Mode and Infalling Gas

We present high-resolution H I and Hα observations of the spiral galaxy NGC 4254. The observations were obtained with the VLA and the Maryland-Caltech Fabry-Perot camera, respectively. NGC 4254 is

A large H I cloud near the centre of the Virgo cluster

We report the discovery of a large H. cloud in the central regions of the Virgo cluster. It is 110 x 25 kpc in size and contains 3.4 x 10(8) M-circle dot of H I. The morphology and kinematics of this