Galaxy formation and evolution

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Spectroscopy of z ~ 7 candidate galaxies: Using Lyman-alpha to constrain the neutral fraction of hydrogen in the high-redshift universe

(2013)

Authors:

Joseph Caruana, Andrew J Bunker, Stephen M Wilkins, Elizabeth R Stanway, Silvio Lorenzoni, Matt J Jarvis, Holly Elbert
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Detection of a High Brightness Temperature Radio Core in the AGN-Driven Molecular Outflow Candidate NGC 1266

(2013)

Authors:

Kristina Nyland, Katherine Alatalo, JM Wrobel, Lisa M Young, Raffaella Morganti, Timothy A Davis, PT de Zeeuw, Susana Deustua, Martin Bureau
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HerMES: Candidate High-Redshift Galaxies Discovered with Herschel/SPIRE

(2013)

Authors:

C Darren Dowell, A Conley, J Glenn, V Arumugam, V Asboth, H Aussel, F Bertoldi, M Bethermin, J Bock, A Boselli, C Bridge, V Buat, D Burgarella, A Cabrera-Lavers, CM Casey, SC Chapman, DL Clements, L Conversi, A Cooray, H Dannerbauer, F De Bernardis, TP Ellsworth-Bowers, D Farrah, A Franceschini, M Griffin, MA Gurwell, M Halpern, E Hatziminaoglou, S Heinis, E Ibar, RJ Ivison, N Laporte, L Marchetti, P Martinez-Navajas, G Marsden, GE Morrison, HT Nguyen, B O'Halloran, SJ Oliver, A Omont, MJ Page, A Papageorgiou, CP Pearson, G Petitpas, I Perez-Fournon, M Pohlen, D Riechers, D Rigopoulou, IG Roseboom, M Rowan-Robinson, J Sayers, B Schulz, Douglas Scott, N Seymour, DL Shupe, AJ Smith, A Streblyanska, M Symeonidis, M Vaccari, I Valtchanov, JD Vieira, M Viero, L Wang, J Wardlow, CK Xu, M Zemcov
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Eccentricity growth and orbit flip in coplanar hierarchical three body systems

(2013)

Authors:

Gongjie Li, Smadar Naoz, Bence Kocsis, Abraham Loeb
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Low masses and high redshifts: The evolution of the mass-metallicity relation

Astrophysical Journal Letters 776:2 (2013)

Authors:

A Henry, C Scarlata, A Domínguez, M Malkan, CL Martin, B Siana, H Atek, AG Bedregal, JW Colbert, M Rafelski, N Ross, H Teplitz, AJ Bunker, A Dressler, N Hathi, D Masters, P McCarthy, A Straughn

Abstract:

We present the first robust measurement of the high redshift mass-metallicity (MZ) relation at 108 ≲ M/M ⊙ ≲ 1010, obtained by stacking spectra of 83 emission-line galaxies with secure redshifts between 1.3 ≲ z ≲ 2.3. For these redshifts, infrared grism spectroscopy with the Hubble Space Telescope Wide Field Camera 3 is sensitive to the R 23 metallicity diagnostic: ([O II] λλ3726, 3729 + [O III] λλ4959, 5007)/Hβ. Using spectra stacked in four mass quartiles, we find a MZ relation that declines significantly with decreasing mass, extending from 12+log(O/H) = 8.8 at M = 109.8 M ⊙, to 12+log(O/H) = 8.2 at M = 10 8.2 M ⊙. After correcting for systematic offsets between metallicity indicators, we compare our MZ relation to measurements from the stacked spectra of galaxies with M ≳ 109.5 M ⊙ and z ∼ 2.3. Within the statistical uncertainties, our MZ relation agrees with the z ∼ 2.3 result, particularly since our somewhat higher metallicities (by around 0.1 dex) are qualitatively consistent with the lower mean redshift (z = 1.76) of our sample. For the masses probed by our data, the MZ relation shows a steep slope which is suggestive of feedback from energy-driven winds, and a cosmological downsizing evolution where high mass galaxies reach the local MZ relation at earlier times. In addition, we show that our sample falls on an extrapolation of the star-forming main sequence (the SFR-M * relation) at this redshift. This result indicates that grism emission-line selected samples do not have preferentially high star formation rates (SFRs). Finally, we report no evidence for evolution of the mass-metallicity-SFR plane; our stack-averaged measurements show excellent agreement with the local relation. © 2013. The American Astronomical Society. All rights reserved.
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