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The GLEAM 4-Jy (G4Jy) Sample: II. Host galaxy identification for individual sources
Publications of the Astronomical Society of Australia ( IF 6.3 ) Pub Date : 2020-06-01 , DOI: 10.1017/pasa.2020.10
Sarah V. White , Thomas M. O. Franzen , Chris J. Riseley , O. Ivy Wong , Anna D. Kapińska , Natasha Hurley-Walker , Joseph R. Callingham , Kshitij Thorat , Chen Wu , Paul Hancock , Richard W. Hunstead , Nick Seymour , Jesse Swan , Randall Wayth , John Morgan , Rajan Chhetri , Carole Jackson , Stuart Weston , Martin Bell , B. M. Gaensler , Melanie Johnston–Hollitt , André Offringa , Lister Staveley–Smith

The entire southern sky (Declination, $\delta< 30^{\circ}$ ) has been observed using the Murchison Widefield Array (MWA), which provides radio imaging of $\sim$ 2 arcmin resolution at low frequencies (72–231 MHz). This is the GaLactic and Extragalactic All-sky MWA (GLEAM) Survey, and we have previously used a combination of visual inspection, cross-checks against the literature, and internal matching to identify the ‘brightest’ radio-sources ( $S_{\mathrm{151\,MHz}}>4$ Jy) in the extragalactic catalogue (Galactic latitude, $|b| >10^{\circ}$ ). We refer to these 1 863 sources as the GLEAM 4-Jy (G4Jy) Sample, and use radio images (of ${\leq}45$ arcsec resolution), and multi-wavelength information, to assess their morphology and identify the galaxy that is hosting the radio emission (where appropriate). Details of how to access all of the overlays used for this work are available at https://github.com/svw26/G4Jy. Alongside this we conduct further checks against the literature, which we document here for individual sources. Whilst the vast majority of the G4Jy Sample are active galactic nuclei with powerful radio-jets, we highlight that it also contains a nebula, two nearby, star-forming galaxies, a cluster relic, and a cluster halo. There are also three extended sources for which we are unable to infer the mechanism that gives rise to the low-frequency emission. In the G4Jy catalogue we provide mid-infrared identifications for 86% of the sources, and flag the remainder as: having an uncertain identification (129 sources), having a faint/uncharacterised mid-infrared host (126 sources), or it being inappropriate to specify a host (2 sources). For the subset of 129 sources, there is ambiguity concerning candidate host-galaxies, and this includes four sources (B0424–728, B0703–451, 3C 198, and 3C 403.1) where we question the existing identification.

中文翻译:

GLEAM 4-Jy (G4Jy) 样品:II。单个来源的宿主星系识别

整个南方天空(赤纬, $\delta< 30^{\circ}$ ) 已使用 Murchison 宽场阵列 (MWA) 进行了观测,该阵列提供无线电成像 $\sim$ 低频 (72–231 MHz) 下的 2 弧分分辨率。这是银河系和银河系外全天 MWA (GLEAM) 调查,我们之前结合了目视检查、对文献的交叉检查和内部匹配来识别“最亮”的无线电源( $S_{\mathrm{151\,MHz}}>4$ Jy)在河外目录(银河纬度, $|b| >10^{\circ}$ )。我们将这 1 863 个源称为 GLEAM 4-Jy (G4Jy) 样本,并使用无线电图像( ${\leq}45$ 弧秒分辨率)和多波长信息,以评估它们的形态并识别承载无线电发射的星系(在适当的情况下)。有关如何访问用于这项工作的所有叠加层的详细信息,请访问https://github.com/svw26/G4Jy. 除此之外,我们还对文献进行了进一步检查,我们在此处记录了这些文献以供个别来源使用。虽然绝大多数 G4Jy 样本是具有强大无线电射流的活跃星系核,但我们强调它还包含一个星云、两个附近的恒星形成星系、一个星团遗迹和一个星团光环。还有三个扩展的来源,我们无法推断出产生低频发射的机制。在 G4Jy 目录中,我们为 86% 的源提供了中红外标识,并将其余部分标记为:具有不确定的标识(129 个源),具有微弱/未表征的中红外宿主(126 个源),或者它不合适指定主机(2 个来源)。对于 129 个源的子集,候选宿主星系存在歧义,
更新日期:2020-06-01
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