LARGE-SCALE STAR-FORMATION-DRIVEN OUTFLOWS AT 1 < z < 2 IN THE 3D-HST SURVEY

Journal Article · Tue Nov 20 00:00:00 EST 2012 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/760/1/49· OSTI ID:22086307

Lundgren, Britt F; Van Dokkum, Pieter; Bezanson, Rachel; Momcheva, Ivelina; Nelson, Erica; Skelton, Rosalind E; Wake, David; Whitaker, Katherine ^[1]; Brammer, Gabriel ^[2]; Franx, Marijn; Fumagalli, Mattia; Labbe, Ivo; Patel, Shannon ^[3]; Da Cunha, Elizabete; Rix, Hans Walter; Schmidt, Kasper ^[4]; Erb, Dawn K ^[5]; Xiaohui, Fan ^[6]; Kriek, Mariska ^[7]; Marchesini, Danilo ^[8] ; others, and

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1. Astronomy Department, Yale University, New Haven, CT 06511 (United States)
2. European Southern Observatory, Alonso de Cordova 3107, Casilla 19001, Vitacura, Santiago (Chile)
3. Leiden Observatory, Leiden University, NL-2300 RA Leiden (Netherlands)
4. Max Planck Institute for Astronomy (MPIA), Koenigstuhl 17, D-69117, Heidelberg (Germany)
5. Department of Physics, University of Wisconsin-Milwaukee, P.O. Box 413, Milwaukee, WI 53201 (United States)
6. Steward Observatory, University of Arizona, Tucson, AZ 85721 (United States)
7. Department of Astronomy, University of California, Berkeley, CA 94720 (United States)
8. Physics and Astronomy Department, Tufts University, Medford, MA 02155 (United States)

We present evidence of large-scale outflows from three low-mass (log(M {sub *}/M {sub Sun }) {approx} 9.75) star-forming (SFR > 4 M {sub Sun} yr{sup -1}) galaxies observed at z = 1.24, z = 1.35, and z = 1.75 in the 3D-HST Survey. Each of these galaxies is located within a projected physical distance of 60 kpc around the sight line to the quasar SDSS J123622.93+621526.6, which exhibits well-separated strong (W {sup {lambda}2796} {sub r} {approx}> 0.8 A) Mg II absorption systems matching precisely to the redshifts of the three galaxies. We derive the star formation surface densities from the H{alpha} emission in the WFC3 G141 grism observations for the galaxies and find that in each case the star formation surface density well exceeds 0.1 M {sub Sun} yr{sup -1} kpc{sup -2}, the typical threshold for starburst galaxies in the local universe. From a small but complete parallel census of the 0.65 < z < 2.6 galaxies with H {sub 140} {approx}< 24 proximate to the quasar sight line, we detect Mg II absorption associated with galaxies extending to physical distances of 130 kpc. We determine that the W{sub r} > 0.8 A Mg II covering fraction of star-forming galaxies at 1 < z < 2 may be as large as unity on scales extending to at least 60 kpc, providing early constraints on the typical extent of starburst-driven winds around galaxies at this redshift. Our observations additionally suggest that the azimuthal distribution of W{sub r} > 0.4 A Mg II absorbing gas around star-forming galaxies may evolve from z {approx} 2 to the present, consistent with recent observations of an increasing collimation of star-formation-driven outflows with time from z {approx} 3.

• OSTI ID: 22086307
• Journal Information: Astrophysical Journal, Vol. 760, Issue 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
ABSORPTION
ABSORPTION SPECTROSCOPY
ASTRONOMY
ASTROPHYSICS
DENSITY
DISTANCE
EMISSION SPECTROSCOPY
GALACTIC EVOLUTION
GALAXIES
MAGNESIUM IONS
MASS
PHOTON EMISSION
QUASARS
RED SHIFT
STAR EVOLUTION
STARS
STELLAR WINDS
UNIVERSE