论文标题
深概要阵列科学I：发现FRB 20220912a的主机银河系的发现
Deep Synoptic Array science I: discovery of the host galaxy of FRB 20220912A
论文作者
论文摘要
我们报告了重复的快速无线电爆发（FRB）源FRB 20220912a在使用深概要阵列（DSA-1110）的调试期间的检测和干涉定位。 10月18日和2022年10月25日，从2022年10月25日和2022年各自发现了两次爆发。最佳位置是（R.A. J2000，dect。J2000）=（23：09：09：04.9， +42：42：25.4），带有90％的置信率为90％的信心错误椭圆形和$ \ pm2 $ cunc and $ 1 $ 1 $ 1 $ 1 $ 1 $ 1 $ \ pm \ pm1 your pm1 your pm flecriential and pm \ c.这两个爆发具有不同的极化特性和时间曲线。我们找到了一个法拉第旋转措施，与Chime/frb报告的低值$+0.6 $ rad m $^{ - 2} $是一致的。 DSA-111的本地化与Galaxy PSO J347.2702+48.7066在红移$ z = 0.0771 $上重叠，我们将其确定为可能的主机。 PSO J347.2702 $+$ 48.7066的出色质量约为$ 10^{10} m _ {\ odot} $，适度的内部灰尘灭绝，并且可能超过$ 0.1 \，M _ {\ odot} $ yr $ $ yr $ $^{-1} $ 0.1 \ $ 0.1 \ $ 0.1 \。对分散度度量的主机 - 盖拉克斯贡献可能是$ \ lyssim50 $ pc cm $^{ - 3} $。因此，很可能会通过宿主星系沿着脆弱的等离子体柱查看FRB 20220912A源。
We report the detection and interferometric localization of the repeating fast radio burst (FRB) source FRB 20220912A during commissioning observations with the Deep Synoptic Array (DSA-110). Two bursts were detected from FRB 20220912A, one each on 2022 October 18 and 2022 October 25. The best-fit position is (R.A. J2000, decl. J2000) = (23:09:04.9, +48:42:25.4), with a 90% confidence error ellipse of $\pm2$ arcsec and $\pm1$ arcsec in right ascension and declination respectively. The two bursts have disparate polarization properties and temporal profiles. We find a Faraday rotation measure that is consistent with the low value of $+0.6$ rad m$^{-2}$ reported by CHIME/FRB. The DSA-110 localization overlaps with the galaxy PSO J347.2702+48.7066 at a redshift $z=0.0771$, which we identify as the likely host. PSO J347.2702$+$48.7066 has a stellar mass of approximately $10^{10}M_{\odot}$, modest internal dust extinction, and a star-formation rate likely in excess of $0.1\,M_{\odot}$ yr$^{-1}$. The host-galaxy contribution to the dispersion measure is likely $\lesssim50$ pc cm$^{-3}$. The FRB 20220912A source is therefore likely viewed along a tenuous plasma column through the host galaxy.
