A New Candidate for the Dark Group of Galaxies, RX J0419+0225

Astronomy and Astrophysics – Astronomy

Scientific paper

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

6

Galaxies: Clusters: Individual (Rx J0419+0225), Galaxies: Elliptical And Lenticular, Cd, X-Rays: Galaxies: Clusters

Scientific paper

The bright extended X-ray source RX J0419 + 0225, first discovered in the ROSAT All Sky Survey and identified with an S0 galaxy NGC 1550, was observed with ASCA for 48ks in 1999 August. The detected diffuse X-ray emission is centered at NGC 1550, whose redshift is 0.0123, extending out to at least 15', or 210h-175 kpc, where h75 is the Hubble constant in units of 75 km s-1 Mpc-1. The X-ray surface brightness is represented by a β model with β ˜= 0.47 and a core radius of 15 ± 1 h -175 kpc. The temperature and 1-10keV X-ray luminosity (up to 15') of this system were measured as being 1.4keV and 4.7 × 1042 h-275 erg s-1, respectively. There is no strong evidence of a temperature gradient. Within a radius of 210 h-175, the estimated total mass of the system becomes 1.5 × 1013 h-175 Msolar, which is typical of a galaxy group. With the optical information currently available, there are only two other faint galaxies. Including their B-band luminosity, the mass-to-light ratio of the system comes to ˜ 400 h75 MsolarLsolar, which is comparable to those of galaxy clusters. Therefore, RX J0419 + 0225 can be regarded as a ``dark group candidate'' in that it has an unusually high mass-to-light ratio for its optical luminosity. This object is one of the nearest among those ever identified as such candidates.

No associations

LandOfFree

Say what you really think

Search LandOfFree.com for scientists and scientific papers. Rate them and share your experience with other people.

Rating

A New Candidate for the Dark Group of Galaxies, RX J0419+0225 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with A New Candidate for the Dark Group of Galaxies, RX J0419+0225, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A New Candidate for the Dark Group of Galaxies, RX J0419+0225 will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFWR-SCP-O-1534543

All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.