Recent studies have shown that galaxies at 2< z 2 galaxies have been hampered by the lack of d... more Recent studies have shown that galaxies at 2< z 2 galaxies have been hampered by the lack of deep multi-wavelength data over sufficiently large fields. We are remedying this situation in the joint Yale/Chile MUSYC near-IR project, which consists of a deep public ISPI survey of three Southern fields. Observations for two fields have been completed, while the third and
We propose to augment our successful survey for Lyman Alpha Emitters (LAEs) at z=3.1 by adding de... more We propose to augment our successful survey for Lyman Alpha Emitters (LAEs) at z=3.1 by adding deep NB3727A MOSAIC imaging of the Extended Hubble Deep Field-South, imaging that would allow us to construct a sample of ~ 350 LAEs at z=2.1. Clustering analysis of the z=3.1 LAEs implies that they are the progenitors of present-day L^* galaxies. The proposed observations
We have undertaken a deep narrow-band survey for Lyman-alpha emitters from z=3.08 to z=3.15 in th... more We have undertaken a deep narrow-band survey for Lyman-alpha emitters from z=3.08 to z=3.15 in the Extended Chandra Deep Field-South using the Mosaic camera on the CTIO 4-m telescope. Lyman-alpha emitters are one of the best examples of galaxies "in the act" of formation. Our survey covers 0.28 square degrees down to a limiting line flux of 1.5 x 10^-17
We have undertaken a deep narrow-band survey for Lyman-alpha emitters from z=3.08 to z=3.15 in th... more We have undertaken a deep narrow-band survey for Lyman-alpha emitters from z=3.08 to z=3.15 in the Extended Chandra Deep Field-South using the Mosaic camera on the CTIO 4-m telescope. Lyman-alpha emitters are one of the best examples of galaxies "in the act" of formation. Our survey covers 0.28 square degrees down to a limiting line flux of 1.5 x 10^-17
We have used the Mosaic camera of the CTIO 4-m telescope to conduct a deep, narrow-band survey of... more We have used the Mosaic camera of the CTIO 4-m telescope to conduct a deep, narrow-band survey of Ly-alpha Emitting Galaxies (LAEs) in the Extended Chandra Deep Field-South over the redshift ranges 3.08 < z < 3.15 and 2.04 < z < 2.08. Our survey covers 0.28 square degrees down to a limiting line flux of about 1.5E-17 ergs/cm2/s at
We have used the Mosaic camera of the CTIO 4-m telescope to conduct a deep, narrow-band survey of... more We have used the Mosaic camera of the CTIO 4-m telescope to conduct a deep, narrow-band survey of Ly-alpha Emitting Galaxies (LAEs) in the Extended Chandra Deep Field-South over the redshift ranges 3.08 < z < 3.15 and 2.04 < z < 2.08. Our survey covers 0.28 square degrees down to a limiting line flux of about 1.5E-17 ergs/cm2/s at
We have coadded X-ray flux of all known Lyα emitters in the 4 Msec Chandra Deep Field South (CDF-... more We have coadded X-ray flux of all known Lyα emitters in the 4 Msec Chandra Deep Field South (CDF-S) region, to place sensitive upper limits on the average unobscured star-formation rate (SFR X ) in these galaxies. A very small fraction of Lyα galaxies in the field are individually detected in the X-rays, implying a low fraction of AGN activity. After excluding the few X-ray detected Lyman alpha emitters (LAEs), we stack the undetected LAEs located in the 4 Ms CDF-S data and 250 ks Extended CDF-S (ECDFS) data, and compute a 1-σ upper limit on SFR X < 14, 28, 28, 140, 440, 880 M ⊙ yr −1 for LAEs located at z = 2.1, 3.1, 3.2, 4.5, 5.7 and 6.5, respectively. The upper limit of SFR X in LAEs can be then be compared to SFR Lyα derived from Lyα line and thus can constrain on the Lyα escape fraction (f Esc Lyα ). We derive a lower limit on f Esc Lyα > 14% (84 % confidence level, 1 σ lower limit) for LAEs at redshift z ∼2.1 and z ∼ 3.1-3.2. At z > 4, the current LAE samples are not of sufficient size to constrain SFR X well. By averaging all the LAEs at z> 2, the X-ray non-detection constrains f Esc Lyα > 17% (84 % confidence level, 1 σ lower limit), and rejects f Esc Lyα < 5.7% at the 99.87% confidence level from 2.1 < z < 6.5.
We have coadded X-ray flux of all known Lyα emitters in the 4 Msec Chandra Deep Field South (CDF-... more We have coadded X-ray flux of all known Lyα emitters in the 4 Msec Chandra Deep Field South (CDF-S) region, to place sensitive upper limits on the average unobscured star-formation rate (SFR X ) in these galaxies. A very small fraction of Lyα galaxies in the field are individually detected in the X-rays, implying a low fraction of AGN activity. After excluding the few X-ray detected Lyman alpha emitters (LAEs), we stack the undetected LAEs located in the 4 Ms CDF-S data and 250 ks Extended CDF-S (ECDFS) data, and compute a 1-σ upper limit on SFR X < 14, 28, 28, 140, 440, 880 M ⊙ yr −1 for LAEs located at z = 2.1, 3.1, 3.2, 4.5, 5.7 and 6.5, respectively. The upper limit of SFR X in LAEs can be then be compared to SFR Lyα derived from Lyα line and thus can constrain on the Lyα escape fraction (f Esc Lyα ). We derive a lower limit on f Esc Lyα > 14% (84 % confidence level, 1 σ lower limit) for LAEs at redshift z ∼2.1 and z ∼ 3.1-3.2. At z > 4, the current LAE samples are not of sufficient size to constrain SFR X well. By averaging all the LAEs at z> 2, the X-ray non-detection constrains f Esc Lyα > 17% (84 % confidence level, 1 σ lower limit), and rejects f Esc Lyα < 5.7% at the 99.87% confidence level from 2.1 < z < 6.5.
We present the first results of our optical spectroscopy program aimed to provide redshifts and i... more We present the first results of our optical spectroscopy program aimed to provide redshifts and identifications for the X-ray sources in the Extended Chandra Deep Field South. A total of 339 sources were targeted using the IMACS spectrograph at the Magellan telescopes and the VIMOS spectrograph at the VLT. We measured redshifts for 186 X-ray sources, including archival data and
We present the first results of our optical spectroscopy program aimed to provide redshifts and i... more We present the first results of our optical spectroscopy program aimed to provide redshifts and identifications for the X-ray sources in the Extended Chandra Deep Field South. A total of 339 sources were targeted using the IMACS spectrograph at the Magellan telescopes and the VIMOS spectrograph at the VLT. We measured redshifts for 186 X-ray sources, including archival data and
We discovered a sample of 261 Lyman alpha emitting (LAE) galaxies at z=2.1 in an ultra-deep 3727A... more We discovered a sample of 261 Lyman alpha emitting (LAE) galaxies at z=2.1 in an ultra-deep 3727A narrow-band MUSYC image of the Extended Chandra Deep Field-South. LAEs were selected to have rest-frame equivalent widths >20A and emission line fluxes >3.7x10-17 ergs/cm2/s, corresponding to L_Lya>1.2x1042 ergs/s. 3% of the original candidates were detected in X-rays by Chandra, and 7% were detected
We discovered a sample of 261 Lyman alpha emitting (LAE) galaxies at z=2.1 in an ultra-deep 3727A... more We discovered a sample of 261 Lyman alpha emitting (LAE) galaxies at z=2.1 in an ultra-deep 3727A narrow-band MUSYC image of the Extended Chandra Deep Field-South. LAEs were selected to have rest-frame equivalent widths >20A and emission line fluxes >3.7x10-17 ergs/cm2/s, corresponding to L_Lya>1.2x1042 ergs/s. 3% of the original candidates were detected in X-rays by Chandra, and 7% were detected
We obtained R=1400 VLT+FORS spectra covering 3500-5500 Angstroms for 30 Lyman Alpha Emitting (LAE... more We obtained R=1400 VLT+FORS spectra covering 3500-5500 Angstroms for 30 Lyman Alpha Emitting (LAE) galaxies at z=2.1 and z=3.1. Our clustering analyses have revealed these LAEs to be progenitors of present-day L* galaxies like the Milky Way (Gawiser et al. 2007, Guaita et al. 2010a). Most of the Lyman alpha emission lines are resolved at this resolution, with a majority
We determine Star Formation Rates (SFRs) in a sample of color selected, star forming (sBzK) galax... more We determine Star Formation Rates (SFRs) in a sample of color selected, star forming (sBzK) galaxies (K(AB)<21.8) in the Extended Chandra Deep Field - South (ECDF-S). To avoid AGN, we eliminate 12% of the original sample that have X-ray detections in Chandra catalogs. Photometric redshift binned, average flux densities are measured with stacking analyses in Spitzer-MIPS IR, BLAST and APEX/LABOCA
We determine Star Formation Rates (SFRs) in a sample of color selected, star forming (sBzK) galax... more We determine Star Formation Rates (SFRs) in a sample of color selected, star forming (sBzK) galaxies (K(AB)<21.8) in the Extended Chandra Deep Field - South (ECDF-S). To avoid AGN, we eliminate 12% of the original sample that have X-ray detections in Chandra catalogs. Photometric redshift binned, average flux densities are measured with stacking analyses in Spitzer-MIPS IR, BLAST and APEX/LABOCA
We study the co-existence of star formation and AGN activity in X-ray selected AGN by analyzing s... more We study the co-existence of star formation and AGN activity in X-ray selected AGN by analyzing stacked 870um submm emission from a deep and wide map of the Extended Chandra Deep Field South, obtained with LABOCA at the APEX telescope. The total X-ray sample of 895 sources with median redshift z~1 is detected at a mean submm flux of 0.49+-0.04mJy,
We study the co-existence of star formation and AGN activity in X-ray selected AGN by analyzing s... more We study the co-existence of star formation and AGN activity in X-ray selected AGN by analyzing stacked 870um submm emission from a deep and wide map of the Extended Chandra Deep Field South, obtained with LABOCA at the APEX telescope. The total X-ray sample of 895 sources with median redshift z~1 is detected at a mean submm flux of 0.49+-0.04mJy,
Promoting racial and ethnic diversity is critically important to the future success and growth of... more Promoting racial and ethnic diversity is critically important to the future success and growth of the field of astronomy. The raw ability, drive and interest required to excel in the field is distributed without regard to race, gender, or socioeconomic background. By not actively promoting diversity in our field we risk losing talented people to other professions (or losing them
Recent studies have shown that galaxies at 2< z 2 galaxies have been hampered by the lack of d... more Recent studies have shown that galaxies at 2< z 2 galaxies have been hampered by the lack of deep multi-wavelength data over sufficiently large fields. We are remedying this situation in the joint Yale/Chile MUSYC near-IR project, which consists of a deep public ISPI survey of three Southern fields. Observations for two fields have been completed, while the third and
We propose to augment our successful survey for Lyman Alpha Emitters (LAEs) at z=3.1 by adding de... more We propose to augment our successful survey for Lyman Alpha Emitters (LAEs) at z=3.1 by adding deep NB3727A MOSAIC imaging of the Extended Hubble Deep Field-South, imaging that would allow us to construct a sample of ~ 350 LAEs at z=2.1. Clustering analysis of the z=3.1 LAEs implies that they are the progenitors of present-day L^* galaxies. The proposed observations
We have undertaken a deep narrow-band survey for Lyman-alpha emitters from z=3.08 to z=3.15 in th... more We have undertaken a deep narrow-band survey for Lyman-alpha emitters from z=3.08 to z=3.15 in the Extended Chandra Deep Field-South using the Mosaic camera on the CTIO 4-m telescope. Lyman-alpha emitters are one of the best examples of galaxies "in the act" of formation. Our survey covers 0.28 square degrees down to a limiting line flux of 1.5 x 10^-17
We have undertaken a deep narrow-band survey for Lyman-alpha emitters from z=3.08 to z=3.15 in th... more We have undertaken a deep narrow-band survey for Lyman-alpha emitters from z=3.08 to z=3.15 in the Extended Chandra Deep Field-South using the Mosaic camera on the CTIO 4-m telescope. Lyman-alpha emitters are one of the best examples of galaxies "in the act" of formation. Our survey covers 0.28 square degrees down to a limiting line flux of 1.5 x 10^-17
We have used the Mosaic camera of the CTIO 4-m telescope to conduct a deep, narrow-band survey of... more We have used the Mosaic camera of the CTIO 4-m telescope to conduct a deep, narrow-band survey of Ly-alpha Emitting Galaxies (LAEs) in the Extended Chandra Deep Field-South over the redshift ranges 3.08 < z < 3.15 and 2.04 < z < 2.08. Our survey covers 0.28 square degrees down to a limiting line flux of about 1.5E-17 ergs/cm2/s at
We have used the Mosaic camera of the CTIO 4-m telescope to conduct a deep, narrow-band survey of... more We have used the Mosaic camera of the CTIO 4-m telescope to conduct a deep, narrow-band survey of Ly-alpha Emitting Galaxies (LAEs) in the Extended Chandra Deep Field-South over the redshift ranges 3.08 < z < 3.15 and 2.04 < z < 2.08. Our survey covers 0.28 square degrees down to a limiting line flux of about 1.5E-17 ergs/cm2/s at
We have coadded X-ray flux of all known Lyα emitters in the 4 Msec Chandra Deep Field South (CDF-... more We have coadded X-ray flux of all known Lyα emitters in the 4 Msec Chandra Deep Field South (CDF-S) region, to place sensitive upper limits on the average unobscured star-formation rate (SFR X ) in these galaxies. A very small fraction of Lyα galaxies in the field are individually detected in the X-rays, implying a low fraction of AGN activity. After excluding the few X-ray detected Lyman alpha emitters (LAEs), we stack the undetected LAEs located in the 4 Ms CDF-S data and 250 ks Extended CDF-S (ECDFS) data, and compute a 1-σ upper limit on SFR X < 14, 28, 28, 140, 440, 880 M ⊙ yr −1 for LAEs located at z = 2.1, 3.1, 3.2, 4.5, 5.7 and 6.5, respectively. The upper limit of SFR X in LAEs can be then be compared to SFR Lyα derived from Lyα line and thus can constrain on the Lyα escape fraction (f Esc Lyα ). We derive a lower limit on f Esc Lyα > 14% (84 % confidence level, 1 σ lower limit) for LAEs at redshift z ∼2.1 and z ∼ 3.1-3.2. At z > 4, the current LAE samples are not of sufficient size to constrain SFR X well. By averaging all the LAEs at z> 2, the X-ray non-detection constrains f Esc Lyα > 17% (84 % confidence level, 1 σ lower limit), and rejects f Esc Lyα < 5.7% at the 99.87% confidence level from 2.1 < z < 6.5.
We have coadded X-ray flux of all known Lyα emitters in the 4 Msec Chandra Deep Field South (CDF-... more We have coadded X-ray flux of all known Lyα emitters in the 4 Msec Chandra Deep Field South (CDF-S) region, to place sensitive upper limits on the average unobscured star-formation rate (SFR X ) in these galaxies. A very small fraction of Lyα galaxies in the field are individually detected in the X-rays, implying a low fraction of AGN activity. After excluding the few X-ray detected Lyman alpha emitters (LAEs), we stack the undetected LAEs located in the 4 Ms CDF-S data and 250 ks Extended CDF-S (ECDFS) data, and compute a 1-σ upper limit on SFR X < 14, 28, 28, 140, 440, 880 M ⊙ yr −1 for LAEs located at z = 2.1, 3.1, 3.2, 4.5, 5.7 and 6.5, respectively. The upper limit of SFR X in LAEs can be then be compared to SFR Lyα derived from Lyα line and thus can constrain on the Lyα escape fraction (f Esc Lyα ). We derive a lower limit on f Esc Lyα > 14% (84 % confidence level, 1 σ lower limit) for LAEs at redshift z ∼2.1 and z ∼ 3.1-3.2. At z > 4, the current LAE samples are not of sufficient size to constrain SFR X well. By averaging all the LAEs at z> 2, the X-ray non-detection constrains f Esc Lyα > 17% (84 % confidence level, 1 σ lower limit), and rejects f Esc Lyα < 5.7% at the 99.87% confidence level from 2.1 < z < 6.5.
We present the first results of our optical spectroscopy program aimed to provide redshifts and i... more We present the first results of our optical spectroscopy program aimed to provide redshifts and identifications for the X-ray sources in the Extended Chandra Deep Field South. A total of 339 sources were targeted using the IMACS spectrograph at the Magellan telescopes and the VIMOS spectrograph at the VLT. We measured redshifts for 186 X-ray sources, including archival data and
We present the first results of our optical spectroscopy program aimed to provide redshifts and i... more We present the first results of our optical spectroscopy program aimed to provide redshifts and identifications for the X-ray sources in the Extended Chandra Deep Field South. A total of 339 sources were targeted using the IMACS spectrograph at the Magellan telescopes and the VIMOS spectrograph at the VLT. We measured redshifts for 186 X-ray sources, including archival data and
We discovered a sample of 261 Lyman alpha emitting (LAE) galaxies at z=2.1 in an ultra-deep 3727A... more We discovered a sample of 261 Lyman alpha emitting (LAE) galaxies at z=2.1 in an ultra-deep 3727A narrow-band MUSYC image of the Extended Chandra Deep Field-South. LAEs were selected to have rest-frame equivalent widths >20A and emission line fluxes >3.7x10-17 ergs/cm2/s, corresponding to L_Lya>1.2x1042 ergs/s. 3% of the original candidates were detected in X-rays by Chandra, and 7% were detected
We discovered a sample of 261 Lyman alpha emitting (LAE) galaxies at z=2.1 in an ultra-deep 3727A... more We discovered a sample of 261 Lyman alpha emitting (LAE) galaxies at z=2.1 in an ultra-deep 3727A narrow-band MUSYC image of the Extended Chandra Deep Field-South. LAEs were selected to have rest-frame equivalent widths >20A and emission line fluxes >3.7x10-17 ergs/cm2/s, corresponding to L_Lya>1.2x1042 ergs/s. 3% of the original candidates were detected in X-rays by Chandra, and 7% were detected
We obtained R=1400 VLT+FORS spectra covering 3500-5500 Angstroms for 30 Lyman Alpha Emitting (LAE... more We obtained R=1400 VLT+FORS spectra covering 3500-5500 Angstroms for 30 Lyman Alpha Emitting (LAE) galaxies at z=2.1 and z=3.1. Our clustering analyses have revealed these LAEs to be progenitors of present-day L* galaxies like the Milky Way (Gawiser et al. 2007, Guaita et al. 2010a). Most of the Lyman alpha emission lines are resolved at this resolution, with a majority
We determine Star Formation Rates (SFRs) in a sample of color selected, star forming (sBzK) galax... more We determine Star Formation Rates (SFRs) in a sample of color selected, star forming (sBzK) galaxies (K(AB)<21.8) in the Extended Chandra Deep Field - South (ECDF-S). To avoid AGN, we eliminate 12% of the original sample that have X-ray detections in Chandra catalogs. Photometric redshift binned, average flux densities are measured with stacking analyses in Spitzer-MIPS IR, BLAST and APEX/LABOCA
We determine Star Formation Rates (SFRs) in a sample of color selected, star forming (sBzK) galax... more We determine Star Formation Rates (SFRs) in a sample of color selected, star forming (sBzK) galaxies (K(AB)<21.8) in the Extended Chandra Deep Field - South (ECDF-S). To avoid AGN, we eliminate 12% of the original sample that have X-ray detections in Chandra catalogs. Photometric redshift binned, average flux densities are measured with stacking analyses in Spitzer-MIPS IR, BLAST and APEX/LABOCA
We study the co-existence of star formation and AGN activity in X-ray selected AGN by analyzing s... more We study the co-existence of star formation and AGN activity in X-ray selected AGN by analyzing stacked 870um submm emission from a deep and wide map of the Extended Chandra Deep Field South, obtained with LABOCA at the APEX telescope. The total X-ray sample of 895 sources with median redshift z~1 is detected at a mean submm flux of 0.49+-0.04mJy,
We study the co-existence of star formation and AGN activity in X-ray selected AGN by analyzing s... more We study the co-existence of star formation and AGN activity in X-ray selected AGN by analyzing stacked 870um submm emission from a deep and wide map of the Extended Chandra Deep Field South, obtained with LABOCA at the APEX telescope. The total X-ray sample of 895 sources with median redshift z~1 is detected at a mean submm flux of 0.49+-0.04mJy,
Promoting racial and ethnic diversity is critically important to the future success and growth of... more Promoting racial and ethnic diversity is critically important to the future success and growth of the field of astronomy. The raw ability, drive and interest required to excel in the field is distributed without regard to race, gender, or socioeconomic background. By not actively promoting diversity in our field we risk losing talented people to other professions (or losing them
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Papers by Eric Gawiser