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

0518365 - ASÚ 2020 RIV US eng J - Journal Article
Minchin, R.F. - Taylor, Rhys - Koeppen, J. - Davies, J. - van Driel, W. - Keenan, O.
The Widefield Arecibo Virgo Extragalactic Survey. I. New Structures in the ALFALFA Virgo 7 Cloud Complex and an Extended Tail on NGC 4522.
Astronomical Journal. Roč. 158, č. 3 (2019), č. článku 121. ISSN 0004-6256. E-ISSN 1538-3881
R&D Projects: GA ČR(CZ) GA19-18647S
Institutional support: RVO:67985815
Keywords : galaxies * clusters * radio lines
OECD category: Astronomy (including astrophysics,space science)
Impact factor: 5.840, year: 2019
Method of publishing: Limited access
https://doi.org/10.3847/1538-3881/ab303e

We are carrying out a sensitive blind survey for neutral hydrogen (HI) in the Virgo cluster and report here on the first 5 degrees x 1 degrees area covered, which includes two optically-dark gas features: the five-cloud ALFALFA Virgo 7 complex (Kent et al. 2007, 2009) and the stripped tail of NGC 4522 (Kenney et al. 2004). We discover a sixth cloud and low velocity gas that extends the velocity range of the complex to over 450 km/s(-1), find that around half of the total HI flux comes from extended emission rather than compact clouds, and see around 150 percent more gas, raising the total HI mass from 5.1 x 10(8) M-circle dot to 1.3 x 10(9) M-circle dot.
Permanent Link: http://hdl.handle.net/11104/0303521