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THE SINS SURVEY: SINFONI INTEGRAL FIELD SPECTROSCOPY OF z similar to 2 STAR-FORMING GALAXIES

TitreTHE SINS SURVEY: SINFONI INTEGRAL FIELD SPECTROSCOPY OF z similar to 2 STAR-FORMING GALAXIES
Type de publicationJournal Article
Year of Publication2009
AuteursSchreiber, NMF, Genzel, R, Bouche, N, Cresci, G, Davies, R, Buschkamp, P, Shapiro, K, Tacconi, LJ, Hicks, EKS, Genel, S, Shapley, AE, Erb, DK, Steidel, CC, Lutz, D, Eisenhauer, F, Gillessen, S, Sternberg, A, Renzini, A, Cimatti, A, Daddi, E, Kurk, J, Lilly, S, Kong, X, Lehnert, MD, Nesvadba, N, Verma, A, McCracken, H, Arimoto, N, Mignoli, M, Onodera, M
JournalAstrophysical Journal
Volume706
Pagination1364-1428
Date PublishedDec
ISBN Number0004-637X
Numéro d'accèsWOS:000271872900035
Résumé

We present the Spectroscopic Imaging survey in the near-infrared (near-IR) with SINFONI ( SINS) of high-redshift galaxies. With 80 objects observed and 63 detected in at least one rest-frame optical nebular emission line, mainly H alpha, SINS represents the largest survey of spatially resolved gas kinematics, morphologies, and physical properties of star-forming galaxies at z similar to 1-3. We describe the selection of the targets, the observations, and the data reduction. We then focus on the "SINS H alpha sample," consisting of 62 rest-UV/optically selected sources at 1.3 < z < 2.6 for which we targeted primarily the H alpha and [N II] emission lines. Only approximate to 30% of this sample had previous near-IR spectroscopic observations. The galaxies were drawn from various imaging surveys with different photometric criteria; as a whole, the SINS H alpha sample covers a reasonable representation of massive M(star) greater than or similar to 10(10) M(circle dot) star-forming galaxies at z approximate to 1.5-2.5, with some bias toward bluer systems compared to pure K-selected samples due to the requirement of secure optical redshift. The sample spans 2 orders of magnitude in stellar mass and in absolute and specific star formation rates, with median values approximate to 3 x 10(10) M(circle dot), approximate to 70M(circle dot) yr(-1), and approximate to 3 Gyr(-1). The ionized gas distribution and kinematics are spatially resolved on scales ranging from approximate to 1.5 kpc for adaptive optics assisted observations to typically approximate to 4-5 kpc for seeing-limited data. The H alpha morphologies tend to be irregular and/or clumpy. About one-third of the SINS H alpha sample galaxies are rotation-dominated yet turbulent disks, another one-third comprises compact and velocity dispersion-dominated objects, and the remaining galaxies are clear interacting/merging systems; the fraction of rotation-dominated systems increases among the more massive part of the sample. The H alpha luminosities and equivalent widths suggest on average roughly twice higher dust attenuation toward the H II regions relative to the bulk of the stars, and comparable current and past-averaged star formation rates.

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