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arXiv 0907.1087astro-ph.CO
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z~2.5超亮红外星暴星系中水超脉泽发射存在的约束条件

Constraints on the presence of water megamaser emission in z~2.5 ultraluminous infrared starburst galaxies

Jeff Wagg, Emmanuel Momjian

摘要:

为了寻找红移22.235GHz的水超脉泽辐射,我们对两个z~2.5的亚毫米透镜星系进行了扩展甚大阵和阿雷西博观测。SMM J14011+0252和SMM J16359+6612都具有多波长特征,与正在进行的星暴活动一致,以及CO线发射,表明存在温暖的分子气体。我们的观测没有发现任何H_2O超脉泽发射的证据,而透镜效应使我们获得了H_2O谱线亮度的深极限,在SMM J14011+0252的情况下,L(H_2O)< 7470 Lsun(3-sigma),在SMM J16359+6612的情况下,L(H_2O)< 1893 Lsun,假设线宽为80 km/s。我们的搜索,以及随后的非检测H2O超脉泽发射在两个强透镜的星暴星系,丰富的气体和尘埃,表明这种超脉泽发射不太可能是常见的高红移星暴星系的unlensed人口。我们利用最近在z = 2.64的透镜类星体MG J 0414 +0534中探测到的强H2O超脉泽发射,对未来的EVLA C波段观测活动星系核中的H2O超脉泽发射进行了预测。

英文摘要:

We present Expanded Very Large Array and Arecibo observations of two lensed submm galaxies at z~2.5, in order to search for redshifted 22.235 GHz water megamaser emission. Both SMM J14011+0252 and SMM J16359+6612 have multi-wavelength characteristics consistent with ongoing starburst activity, as well as CO line emission indicating the presence of warm molecular gas. Our observations do not reveal any evidence for H2O megamaser emission in either target, while the lensing allows us to obtain deep limits to the H_2O line luminosities, L(H2O) < 7470 Lsun (3-sigma) in the case of SMM J14011+0252, and L(H2O) < 1893 Lsun for SMM J16359+6612, assuming linewidths of 80 km/s. Our search for, and subsequent non-detection of H2O megamaser emission in two strongly lensed starburst galaxies, rich in gas and dust, suggests that such megamaser emission is not likely to be common within the unlensed population of high-redshift starburst galaxies. We use the recent detection of strong H2O megamaser emission in the lensed quasar, MG J0414+0534 at z = 2.64 to make predictions for future EVLA C-band surveys of H2O megamaser emission in submm galaxies hosting AGN.

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