Volume 506, Number 2, November I 2009
|Page(s)||677 - 680|
|Published online||03 September 2009|
1 b) Reproductions of the blue POSS-II survey measure 6' by 6', north is at top, east at left. The dwarf galaxies FS20 and LeG18 are given in the upper image a), while d1217+4708 is shown in the lower picture b).
d0245+3955, d0245+3957, and d0246+3952
These irregular galaxies of low surface brightness form a tight triple sub-system inside the NGC 1023 group.
This faint object of very low surface brightness was discovered by Chiboucas et al. (2009) as a probable background galaxy behind the M 81 group. There is a strong disagreement between its low luminosity and the broad HI line width, leading to / 184 and / in solar units. We carefully inspected its surroundings using POSS-II and SDSS and did not find any suitable optical counterpart to explain the detected HI signal. This object would be an interesting target for a more detailed study.
FS 20 = LeG 19 and LeG 18
These dwarf members of the Leo-I group (Karachentsev and Karachentseva 2004) are separated by 3 arcmin (see Fig. A.1), both being within the antenna beam. LeG 18 was detected within the Arecibo ALFALFA survey as AGC 201970 with km s-1, W50 = 38 km s-1, and S = 0.55 Jy km s-1. FS 20 may be probably identified with AGC 205290 [10 46 42.4 +12 46 58] with km s-1, W50 =50 km s-1, and S = 1.46 Jy km s-1 (Stierwalt et al. 2009). Both objects are within the so-called ``Leo HI ring'' (Schneider et al. 1983).
This is another dwarf member of the Leo-I group (see Stierwalt et al. 2009), for which km s-1, W50 = 44 km s-1, and S = 1.74 Jy km s-1. Its optical velocity, km s-1, from the SDSS DR4 corresponds to a blue knot outside the galaxy centre.
The marginal narrow HI line ( km s-1) reported by Karachentsev et al. (2007) lies in a radial velocity range with frequent RFI. Therefore, we included this object in Table 3 (upper limits).
d1217+4703 = BTS 109
This is a new tiny member of the Canes Venatici I cloud (see Fig. A.1) with very high HI-mass-to-luminosity ratio of 6.5, and MT/ in solar units.
d1221+2814 = KK 138
Marginal HI detection. The broad HI line width W50 = 186 km s-1 yields an extremely high total-mass-to luminosity ratio of 250 in solar units.
d1233+3806 = BTS 142
This object was detected also in a blind HI survey at Westerbork (Kovac et al. 2009); km s-1, W50 = 47 km s-1, and S = 0.41 Jy km s-1.
This is a probable dwarf companion of NGC 4594 (the ``Sombrero'' galaxy); km s-1. Assuming a distance of 9.33 Mpc (Ferrarese et al. 2000) for NGC4594 the projected separation of KKSG 29 from NGC 4594 is 218 kpc. A difference in radial velocity of 266 km s-1 between both galaxies yields an orbital mass estimate of or / in solar units. There are four other probable dwarf companions to the Sombrero galaxy within 200 kpc, KKSG 31, KKSG 32, KKSG 33, and KKSG 34; which are all of type dSphs and not detected in HI.
d1243+2956 = BTS 152
This object is HI-rich, a suitable target for a detailed study in H and HI.
A new dwarf member of the CVn I cloud. It was also detected by Kovac et al. (2009) with km s-1.
d1312+4147 = KKH 82 = UGCA 337
A new member of the CVn I cloud. Its optical velocity of km s-1 (SDSS DR4) agrees well with the HI velocity. However, the broad HI line width of 234 km s-1 yields an extremely high / in solar units. No suitable object for confusion could be found within the antenna beam.
Table 3: Observational data - upper limits.
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