Quasar Sightline and Galaxy Evolution (QSAGE) survey – I. The galaxy environment of O vi absorbers up to z = 1.4 around PKS 0232−04

Quasar Sightline and Galaxy Evolution (QSAGE) survey – I. The galaxy environment of O vi absorbers up to z = 1.4 around PKS 0232−04
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类星体视线和星系演化 (QSAGE) 调查 – I. PKS 0232−04 周围 z = 1.4 范围内 O vi 吸收体的星系环境

DOI:
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发表时间:
2018
影响因子:
4.8
通讯作者:
J. Prochaska
J. Prochaska
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
R. Bielby;J. Stott;F. Cullen;T. Tripp;J. Burchett;M. Fumagalli;S. Morris;N. Tejos;R. Crain;R. Bower;J. Prochaska

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我们提出的第一个结果,从O VI吸收星系周围的z < 1.44使用的数据从近红外棱镜光谱哈勃太空望远镜大型计划,类星体视线和星系演化(QSAGE)调查。QSAGE是第一个聚焦于z = 1的环星系介质的棱晶星系巡天,提供了对星系群的盲测。星系样本是H α通量限制的(f(H α)> 2 × 10−17 erg s−1 cm−2),在0.68 < z < 1.44,对应于0.2-0.8 M yr−1。在这12个领域的第一个,我们联合收割机的高分辨率STIS和COS光谱的背景类星体的星系数据相结合,研究O VI在环银河系介质。在z = 1处,我们发现距离最近的星系高达B = 350 kpc(R = 4 Rvir)的O vi吸收系统。此外,我们发现${sim }50{{ 在2 Rvir内的101 M yr−1恒星形成星系中,有100%}}$的O vi吸收量不超过N(O vi)= 1013.9 cm−2。我们检测到O VI在这么大的距离从星系和恒星形成星系的一个显着的比例没有检测到O VI吸收不利流出正在进行的星星形成的主要介质跟踪这些吸收剂。相反,通过将我们自己的低和高红移数据与现有样本相结合,我们发现了许多强(N(O vi)> 1014 cm−2)O vi吸收系统与M 109.5-10 M质量星系相关的初步证据(Mhalo <$1011.5 -12 M <$暗物质晕),并推断他们可能主要追踪这些星系晕内的碰撞电离气体。
We present the first results from a study of O vi absorption around galaxies at z < 1.44 using data from a near-infrared grism spectroscopic Hubble Space Telescope Large Programme, the Quasar Sightline and Galaxy Evolution (QSAGE) survey. QSAGE is the first grism galaxy survey to focus on the circumgalactic medium at z ∼ 1, providing a blind survey of the galaxy population. The galaxy sample is H α flux limited (f(H α) > 2 × 10−17 erg s−1 cm−2) at 0.68 < z < 1.44, corresponding to ≳0.2–0.8 M⊙ yr−1. In this first of 12 fields, we combine the galaxy data with high-resolution STIS and COS spectroscopy of the background quasar to study O vi in the circumgalactic medium. At z ∼ 1, we find O vi absorption systems up to b ∼ 350 kpc (∼4Rvir) from the nearest detected galaxy. Further, we find ${sim }50{{ m per cent}}$ of ≳1 M⊙ yr−1 star-forming galaxies within 2Rvir show no associated O vi absorption to a limit of at least N(O vi) = 1013.9 cm−2. That we detect O vi at such large distances from galaxies and that a significant fraction of star-forming galaxies show no detectable O vi absorption disfavours outflows from ongoing star formation as the primary medium traced by these absorbers. Instead, by combining our own low- and high-redshift data with existing samples, we find tentative evidence for many strong (N(O vi) > 1014 cm−2) O vi absorption systems to be associated with M⋆ ∼ 109.5–10 M⊙ mass galaxies (Mhalo ∼ 1011.5–12 M⊙ dark matter haloes), and infer that they may be tracing predominantly collisionally ionized gas within the haloes of such galaxies.
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