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Shimizu, Hiroshi; Usuda, Makoto; Kadoya, Takashi

doi:10.2524/jtappij.35.913

Cited by 6 publications

(8 citation statements)

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“…LAEs are found to be larger for galaxies with higher stellar mass, higher dust obscuration, and higher star formation rate (averaged over 100 Myr, see Guaita et al 2011). These results are broadly consistent with the numerical simulations of Shimizu & Umemura (2010), who predict that size, stellar mass, and star formation rate will correlate positively with the mass-weighted age of LAEs.…”

Section: Discussionsupporting

confidence: 90%

EVOLUTION IN THE CONTINUUM MORPHOLOGICAL PROPERTIES OF Lyα-EMITTING GALAXIES FROMz= 3.1 TOz= 2.1

Bond

Gawiser

Guaita

et al. 2012

ApJ

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Section: Discussionsupporting

confidence: 90%

EVOLUTION IN THE CONTINUUM MORPHOLOGICAL PROPERTIES OF Lyα-EMITTING GALAXIES FROMz= 3.1 TOz= 2.1

Bond

Gawiser

Guaita

et al. 2012

ApJ

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“…This suggests a scenario in which galaxy interactions, as well as providing fuel for star formation (Tilvi et al 2011), sufficiently disrupt and ionise the ISM to give Lyα photons an easy escape. Shimizu & Umemura (2010) presented a model in which galaxies can not only appear as LAEs when a burst of star-formation occurs (i.e. a Lyαbright phase; see also Dijkstra & Wyithe 2007;Nagamine et al 2007), but also when a young satellite galaxy is accreted onto a more massive object.…”

Section: Lyα Blobs (Labs)mentioning

confidence: 99%

Ly-α and Mg II as Probes of Galaxies and Their Environment

Barnes¹,

Garel²,

Kacprzak³

2014

Publications of the Astronomical Society of the Pacific

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Lyα emission, Lyα absorption and Mgii absorption are powerful tracers of neutral hydrogen. Hydrogen is the most abundant element in the universe and plays a central role in galaxy formation via gas accretion and outflows, as well as being the precursor to molecular clouds, the sites of star formation. Since 21cm emission from neutral hydrogen can only be directly observed in the local universe, we rely on Lyα emission, and Lyα and Mgii absorption to probe the physics that drives galaxy evolution at higher redshifts. Furthermore, these tracers are sensitive to a range of hydrogen densities that cover the interstellar medium, the circumgalactic medium and the intergalactic medium, providing an invaluable means of studying gas physics in regimes where it is poorly understood. At high redshift, Lyα emission line searches have discovered thousands of star-forming galaxies out to z = 7. The large Lyα scattering cross-section makes observations of this line sensitive to even very diffuse gas outside of galaxies. Several thousand more high-redshift galaxies are known from damped Lyα absorption lines and absorption by the Mgii doublet in quasar and GRB spectra. Mg ii, in particular, probes metal-enriched neutral gas inside galaxy haloes in a wide range of environments and redshifts (0.1 < z < 6.3), including the so-called redshift desert. Here we review what observations and theoretical models of Lyα emission, Lyα and Mg ii absorption have told us about the interstellar, circumgalactic and intergalactic medium in the context of galaxy formation and evolution.

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“…In spite of extensive observational and theoretical efforts in the decade after the first discovery of LABs, the formation mechanisms of LABs are still controversial (Mori & Umemura 2006;Dijkstra & Loeb 2009;Geach et al 2009;Scarlata et al 2009;Faucher-Giguere et al 2010;Goerdt et al 2010;Shimizu & Umemura 2010). Among the LABs, special attention has been given to the largest examples with the spatial extents of ∼100-200 kpc (hereinafter giant LABs) because of their spectacular morphologies and possible association with protoclusters (Steidel et al 2000;Palunas et al 2004;Prescott et al 2008;Matsuda et al 2009).…”

Section: Introductionmentioning

confidence: 99%

The Subaru Lyα blob survey: a sample of 100-kpc Lyα blobs at z = 3

Matsuda

Yamada

Hayashino

et al. 2011

Monthly Notices of the Royal Astronomical Society: Letters

133

166

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We present results of a survey for giant Lyα blobs (LABs) at z= 3 with Subaru/Suprime‐Cam. We obtained Lyα imaging at z= 3.09 ± 0.03 around the SSA22 protocluster and in several blank fields. The total survey area is 2.1 deg2, corresponding to a comoving volume of 1.6 × 106 Mpc3. Using a uniform detection threshold of 1.4 × 10−18 erg s−1 cm−2 arcsec−2 for the Lyα images, we construct a sample of 14 LAB candidates with major‐axis diameters larger than 100 kpc, including five previously known blobs and two known quasars. This survey triples the number of known LABs over 100 kpc. The giant LAB sample shows a possible ‘morphology–density relation’: filamentary LABs reside in average density environments as derived from compact Lyα emitters, while circular LABs reside in both average density and overdense environments. Although it is hard to examine the formation mechanisms of LABs only from the Lyα morphologies, more filamentary LABs may relate to cold gas accretion from the surrounding intergalactic medium (IGM) and more circular LABs may relate to large‐scale gas outflows, which are driven by intense starbursts and/or by active galactic nucleus activities. Our survey highlights the potential usefulness of giant LABs to investigate the interactions between galaxies and the surrounding IGM from the field to overdense environments at high redshift.

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Cited by 6 publications

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EVOLUTION IN THE CONTINUUM MORPHOLOGICAL PROPERTIES OF Lyα-EMITTING GALAXIES FROMz= 3.1 TOz= 2.1

EVOLUTION IN THE CONTINUUM MORPHOLOGICAL PROPERTIES OF Lyα-EMITTING GALAXIES FROMz= 3.1 TOz= 2.1

Ly-α and Mg II as Probes of Galaxies and Their Environment

The Subaru Lyα blob survey: a sample of 100-kpc Lyα blobs at z = 3

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