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The environment of large equivalent width Lyα emitters at z ∼ 3

Published online by Cambridge University Press:  10 June 2020

Arisa Kida ,
Satoshi Kikuta  and
Yuichi Matsuda et al.
Arisa Kida
Affiliation:
Kwansei Gakuin University, 2-1 Gakuen, Sanda, Hyogo, 669-1337, Japan email: [email protected]
Satoshi Kikuta
Affiliation:
National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo, 181-8588, Japan SOKENDAI (the Graduate University for Advanced Studies), 2-21-1 Osawa, Mitaka, Tokyo181-8588, Japan
Yuichi Matsuda et al.
Affiliation:
National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo, 181-8588, Japan SOKENDAI (the Graduate University for Advanced Studies), 2-21-1 Osawa, Mitaka, Tokyo181-8588, Japan
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Abstract

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We present the environmental properties of a sample of 260 Lyα emitters (LAEs) with extremely large equivalent widths (EW0 > 240 Å) at z ∼ 3. Such large EW LAEs may be very low-metal / young starbursts in void regions or Hi gas /galaxies illuminated by ionizing radiation from the QSO. We undertook Subaru/HSC Lyα imaging observations around a hyper luminous QSO at z = 2.84. We identified 3490 LAEs including 260 large EW LAEs. We found that the large EW LAEs tend to lie at galaxy over-dense regions surrounding the QSO, suggesting that most of the large EW LAEs are illuminated by the QSO. From the radial distribution of the large EW LAEs from the QSO, we found that the fraction of large EW LAE shows two excesses in the range of 2 to 5 Mpc and 14 to 16 Mpc from the QSO. If the two peaks are reflected with the QSO activity, the QSO should have episodic lifetimes with ∼10 Myr duration and ∼30 Myr separations. However, we require future spectroscopic observations to investigate if the large EW LAEs far from the QSO are low-metal young starbursts.

Keywords

Lyα emittersQSOEnvironment
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 15 , Symposium S341: Challenges in Panchromatic Modelling with Next Generation Facilities , November 2019 , pp. 277 - 278
Copyright
© International Astronomical Union 2020

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