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A New Candidate for the Dark Group of Galaxies, RX J0419+0225
The bright extended X-ray source RX J0419 + 0225, first discovered inthe ROSAT All Sky Survey and identified with an S0 galaxy NGC 1550, wasobserved with ASCA for 48ks in 1999 August. The detected diffuse X-rayemission is centered at NGC 1550, whose redshift is 0.0123, extendingout to at least 15', or 210h-175 kpc, whereh75 is the Hubble constant in units of 75 km s-1Mpc-1. The X-ray surface brightness is represented by aβ model with ⠘= 0.47 and a core radius of 15 ± 1h -175 kpc. The temperature and 1-10keV X-rayluminosity (up to 15') of this system were measured as being 1.4keV and4.7 × 1042 h-275 ergs-1, respectively. There is no strong evidence of atemperature gradient. Within a radius of 210h-175, the estimated total mass of the systembecomes 1.5 × 1013 h-175Msolar, which is typical of a galaxy group. With the opticalinformation currently available, there are only two other faintgalaxies. Including their B-band luminosity, the mass-to-light ratio ofthe system comes to ˜ 400 h75MsolarLsolar, which is comparable to those ofgalaxy clusters. Therefore, RX J0419 + 0225 can be regarded as a ``darkgroup candidate'' in that it has an unusually high mass-to-light ratiofor its optical luminosity. This object is one of the nearest amongthose ever identified as such candidates.

Galaxy coordinates. II. Accurate equatorial coordinates for 17298 galaxies
Using images of the Digitized Sky Survey we measured coodinates for17298 galaxies having poorly defined coordinates. As a control, wemeasured with the same method 1522 galaxies having accurate coordinates.The comparison with our own measurements shows that the accuracy of themethod is about 6 arcsec on each axis (RA and DEC).

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Observation and Astrometry data

Right ascension:04h19m41.50s
Aparent dimensions:0.339′ × 0.204′

Catalogs and designations:
Proper Names
ICIC 366

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