A VLT/FORS2 spectroscopic survey in the HDF-S

Vanzella, E.; Cristiani, S.; Arnouts, S.; Dennefeld, M.; Fontana, A.; Grazian, A.; Nonino, M.; Petitjean, P.; Saracco, P.

doi:10.1051/0004-6361:20021453

Cited by 32 publications

(41 citation statements)

References 31 publications

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“…The Flores et al (2006) sample includes 28 galaxies. Originally, spectra from the CFRS (Hammer et al 1997) and from FORS1 and FORS2 data for the HDFS (Vanzella et al 2002;Rigopoulou et al 2005) were used to select galaxies with the [OII] emission lines detected. This first run of observations demonstrates that the FLAMES/GIRAFFE instrument was able to detect all galaxies with EW([OII]) > 15 Å and I AB ≤ 23.5 after 8 to 13 h of integration time (see Flores et al 2006, for more details).…”

Section: Datamentioning

confidence: 99%

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Neichel¹,

Hammer²,

Puech³

et al. 2008

A&A

125

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We present a first combined analysis of the morphological and dynamical properties for the intermediate-mass Galaxy Evolution Sequence (IMAGES) sample. It is a representative sample of 52 z ∼ 0.6 galaxies with M stell from 1.5 to 15×10 10 M that possesses 3D resolved kinematics and HST deep imaging in at least two broad band filters. We aim at evaluating the evolution of rotating spirals robustly since z ∼ 0.6, as well as at testing the different schemes for classifying galaxies morphologically. We used all the information provided by multi-band images, color maps, and 2D light fitting to assign a morphological class to each object. We divided our sample into spiral disks, peculiar objects, compact objects, and mergers. Using our morphological classification scheme, 4/5 of the identified spirals are rotating disks, and more than 4/5 of identified peculiar galaxies show complex kinematics, while automatic classification methods such as concentration-asymmetry and GINI-M20 severely overestimate the fraction of relaxed disk galaxies. Using this methodology, we find that the fraction of undisturbed rotating spirals has increased by a factor ∼2 during the past 6 Gyr, a much higher fraction than was found previously based on morphologies alone. These rotating spiral disks are forming stars very rapidly, even doubling their stellar masses over the past 6 Gyr, while most of their stars were formed a few Gyr earlier, which reveals a large gas supply. Because they are the likely progenitors of local spirals, we can conjecture how their properties are evolving. Their disks show some evidence of inside-out growth, and the gas supply/accretion is not random since the disk needs to be stable in order to match the local disk properties.

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Section: Datamentioning

confidence: 99%

Images

Neichel¹,

Hammer²,

Puech³

et al. 2008

A&A

125

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“…We selected F257 as our primary target for this observing run because it is the second brightest K band source (K = 20.25) of the large disks in the HDF-S (Labbé et al 2003a) that has a known spectroscopic redshift (z = 2.03, Vanzella et al 2002) with Hα at an observable wavelength with SINFONI. (We had observed the brightest K band target fullfilling this criteria during an earlier observing run, see van Starkenburg et al 2008b.)…”

Section: Introductionmentioning

confidence: 99%

Dynamical properties of a large young disk galaxy atz= 2.03

Starkenburg

Werf

Franx

et al. 2008

A&A

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Context. The study of high redshift Tully-Fisher relations (TFRs) is limited by the use of long slit spectrographs, rest frame B band and star formation selected galaxies. Aims. We try to circumvent these issues by using integral field spectroscopy (SINFONI), by studying the rest frame K band and stellar mass TFR, and by selecting targets without a bias to strongly star forming galaxies. In this paper, we demonstrate our methods on our best case. This galaxy, F257, at z = 2.03, was selecte from a sample of candidate high redshift large disk galaxies in the Hubble Deep Field South that were selected with photometric and morphological criteria. Methods. We used SINFONI at the VLT to obtain an integral field spectrum of the Hα line and hence a velocity field and rotation curve. We also use UBVIJHK+IRAC band photometry to determine a stellar photometric mass. Results. We find that F257 is indistinguishable from local late type galaxies in many respects: it has a regular velocity field, increasing velocity disperion towards its center, its rotation curve flattens at 1−2 disk scale lengths, it has the same specific angular momentum as local disks, its properties are consistent with the local K band TFR. Although mainly rotationally supported, its gas component is dynamically heated with respect to local galaxies (V/σ z ∼ 4) and it is offset from the local stellar mass TFR at the 2σ level. But, this offset depends on the SED modeling parameters. In particular, for a 2-component star formation history (SFH), F257 is in agreement with the local stellar mass TFR. F257 is then a nearly (∼75%) maximum disk. The dynamical properties of F257 are more like those of local galaxies than those of any other galaxy at similar redshift observed to date. However, the gas-to-stellar mass ratio is unusally large: 2.5.

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“…However, while over 150 spectroscopic redshifts have been measured in the area of the northern Hubble Deep Field (Cohen et al 1996;Steidel et al 1996;Lowenthal et al 1997), to date only a relatively small number of HDF-S spectroscopic redshifts has been secured (46 redshifts, of which 29 are at z < 1; see Vanzella et al 2002 for a recent compilation). In the present paper we present a catalog of spectroscopic redshifts in the HDF-S and its flanking fields, which we obtained as part of our study of faint galaxies at moderate redshift, z $ 0.5.…”

Section: Introductionmentioning

confidence: 99%

Redshifts in the Hubble Deep Field South

Sawicki¹,

Mallén‐Ornelas²

2003

Astron J

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We present a catalog of 97 spectroscopic redshifts of z < 1 galaxies in the Hubble Deep Field South (HDF-S) and its flanking fields (FFs). In the HDF-S proper we observed approximately half the galaxies brighter than I 814 (AB) = 24 and obtained redshifts for 76% of them. Targets in our HDF-S sample were preselected to be at z < 1 based on photometric redshifts, while in the FFs a simple magnitude cut was used. The photometric redshift preselection in the HDF-S resulted in a spectroscopic success rate that is significantly higher than in the FFs, where no preselection was applied. The rms precision of our redshift measurements, determined from repeat observations, is z = 0.0003. We present the photometry and redshifts for the 97 objects for which we secured spectroscopic redshifts and describe the basic properties of this sample.

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A VLT/FORS2 spectroscopic survey in the HDF-S

Cited by 32 publications

References 31 publications

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Dynamical properties of a large young disk galaxy atz= 2.03

Redshifts in the Hubble Deep Field South

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