The Arecibo L-Band Feed Array Zone of Avoidance (ALFA ZOA) Survey has discovered a nearby galaxy, ALFA ZOA J1952+1428, at a heliocentric velocity of +279 km s-1. The galaxy was discovered at low Galactic latitude by 21-cm emission from neutral hydrogen (Hi). We have obtained follow-up observations with the EVLA and the 0.9-m SARA optical telescope. The Hi distribution overlaps an uncataloged, potential optical counterpart. The Hi linear size is 1.4 kpc at our adopted distance of D = 7 Mpc, but the distance estimate is uncertain as Hubble's law is unreliable at low recessional velocities. The optical counterpart has mB = 16.9 mag and B - R = 0.1 mag. These characteristics, including MHI = 107.0 M\odot and LB = 107.5 L\odot, if at 7 Mpc, indicate that this galaxy is a blue compact dwarf, but this remains uncertain until further follow-up observations are complete. Optical follow-up observations are ongoing and near infrared follow-up observations have been scheduled.
翻译:Arecibo L-Band Forest Array Arrage 回避区(ALFA ZOA)测量发现附近星系,ALFA ZOA J1952+1428, 其高度中心速度为+279 s-1。该星系是在中性氢(Hi)的21厘米排放在低银河纬度处发现的。我们与EVLA和0.9m SARA光学望远镜取得了后续观测结果。Hi的分布重叠了一个未编目的潜在光学对应方。在D=7 Mpc的我们所接受的距离处,Hi线性尺寸为1.4 kpc,但是由于哈勃的法律在低衰退速度方面不可靠,距离估计并不确定。光学对应方的mB=16.9 mag和B-R=0.1 mag。这些特性包括MHI=107.0 Modot和LB=107.5 Lodot,如果在7 Mpc,则显示该星系是一个蓝式的紧凑的侏,但这一估计一直不确定,直到后续观测工作即将完成。