MIGHTEE-H i:对 COSMOS 星场的深度谱线观测

IF 4.7 3区 物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS
I Heywood, A A Ponomareva, N Maddox, M J Jarvis, B S Frank, E A K Adams, M Baes, A Bianchetti, J D Collier, R P Deane, M Glowacki, S L Jung, H Pan, S H A Rajohnson, G Rodighiero, I Ruffa, M G Santos, F Sinigaglia, M Vaccari
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引用次数: 0

摘要

MIGHTEE巡天利用南非MeerKAT射电望远镜观测四个河外星系深场,目的是加深我们对星系在整个宇宙时间内的形成和演化的理解。MIGHTEE的频率覆盖范围包括z≃0.58的$\textrm {H}\scriptstyle \mathrm{I}$线和z≃0.9的OH megamasers。我们展示了 COSMOS 星场的 MIGHTEE-$\textrm {H}\scriptstyle \mathrm{I}$成像产品,共使用了 94.2 小时的目标时间和 15 个单点的近距离马赛克。光谱成像覆盖了 MeerKAT L 波段内两个宽广、相对无干扰的区域(960-1150 和 1290-1520 MHz),光谱分辨率高达 26 kHz(z = 0 时为 5.5 km s-1)。最高光谱分辨率数据的噪声中值为 74 μJy beam-1,对应于 z = 0.07 时 300 km s-1 线的 5σ $textrm {H}\scriptstyle \mathrm{I}$ 质量限值 108.5 M⊙。镶嵌图覆盖>4 deg2,以多种角度分辨率/灵敏度配对的方式提供,z = 0时$\textrm {H}scriptstyle \mathrm{I}$的角度分辨率为12″。我们描述了光谱线处理工作流程,这将是未来MIGHTEE-$\textrm {H}\scriptstyle \mathrm{I}$产品的基础,以及对COSMOS星场光谱成像的验证和一些早期结果。我们发现在CHILES巡天报告的z = 0.376 $\textrm {H}\scriptstyle \mathrm{I}$线的位置上没有线发射的证据,置信度为94%,因此这个星系的MHI的3σ上限为8.1 × 109 M⊙。本文附有公开数据。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
MIGHTEE-H i: Deep spectral line observations of the COSMOS field
The MIGHTEE survey utilises the South African MeerKAT radio telescope to observe four extragalactic deep fields, with the aim of advancing our understanding of the formation and evolution of galaxies across cosmic time. MIGHTEE’s frequency coverage encompasses the $\textrm {H}\scriptstyle \mathrm{I}$ line to a redshift of z ≃ 0.58, and OH megamasers to z ≃ 0.9.. We present the MIGHTEE-$\textrm {H}\scriptstyle \mathrm{I}$ imaging products for the COSMOS field, using a total of 94.2 h on-target and a close-packed mosaic of 15 individual pointings. The spectral imaging covers two broad, relatively interference-free regions (960–1150 and 1290–1520 MHz) within MeerKAT’s L-band, with up to 26 kHz spectral resolution (5.5 km s−1 at z = 0). The median noise in the highest spectral resolution data is 74 μJy beam−1, corresponding to a 5σ $\textrm {H}\scriptstyle \mathrm{I}$ mass limit of 108.5 M⊙ for a 300 km s−1 line at z = 0.07. The mosaics cover >4 deg2, provided at multiple angular resolution / sensitivity pairings, with an angular resolution for $\textrm {H}\scriptstyle \mathrm{I}$ at z = 0 of 12″. We describe the spectral line processing workflow that will be the basis for future MIGHTEE-$\textrm {H}\scriptstyle \mathrm{I}$ products, and validation of, and some early results from, the spectral imaging of the COSMOS field. We find no evidence for line emission at the position of the z = 0.376 $\textrm {H}\scriptstyle \mathrm{I}$ line reported from the CHILES survey at a >94 per cent confidence level, placing a 3σ upper limit of 8.1 × 109 M⊙ on MHI for this galaxy. A public data release accompanies this article.
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来源期刊
CiteScore
9.10
自引率
37.50%
发文量
3198
审稿时长
3 months
期刊介绍: Monthly Notices of the Royal Astronomical Society is one of the world''s leading primary research journals in astronomy and astrophysics, as well as one of the longest established. It publishes the results of original research in positional and dynamical astronomy, astrophysics, radio astronomy, cosmology, space research and the design of astronomical instruments.
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