Star formation rate and extinction in faint z ∼ 4 Lyman break galaxies

To, Chun-Hao; Wang, Wei-Hao; Owen, Frazer N.

doi:10.1088/0004-637X/792/2/139

Title: Star formation rate and extinction in faint z ∼ 4 Lyman break galaxies

Full Record
Other Related Research

Abstract

We present a statistical detection of 1.5 GHz radio continuum emission from a sample of faint z ∼ 4 Lyman break galaxies (LBGs). To constrain their extinction and intrinsic star formation rate (SFR), we combine the latest ultradeep Very Large Array 1.5 GHz radio image and the Hubble Space Telescope Advanced Camera for Surveys (ACS) optical images in the GOODS-N. We select a large sample of 1771 z ∼ 4 LBGs from the ACS catalog using B {sub F435W}-dropout color criteria. Our LBG samples have I {sub F775W} ∼ 25-28 (AB), ∼0-3 mag fainter than M{sub UV}{sup ⋆} at z ∼ 4. In our stacked radio images, we find the LBGs to be point-like under our 2'' angular resolution. We measure their mean 1.5 GHz flux by stacking the measurements on the individual objects. We achieve a statistical detection of S {sub 1.5} {sub GHz} = 0.210 ± 0.075 μJy at ∼3σ for the first time on such a faint LBG population at z ∼ 4. The measurement takes into account the effects of source size and blending of multiple objects. The detection is visually confirmed by stacking the radio images of the LBGs, and the uncertainty is quantified withmore »« less

Authors:

To, Chun-Hao; Wang, Wei-Hao ^[1]; Owen, Frazer N. ^[2]

Institute of Astronomy and Astrophysics, Academia Sinica, No. 1, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan (China)
National Radio Astronomy Observatory, P.O. Box 0, Socorro, NM 87801 (United States)

Publication Date:: Wed Sep 10 00:00:00 EDT 2014

OSTI Identifier:: 22365078

Resource Type:: Journal Article

Journal Name:: Astrophysical Journal

Additional Journal Information:: Journal Volume: 792; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X

Country of Publication:: United States

Language:: English

Subject:: 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; CALIBRATION; CATALOGS; COLOR; COMPUTERIZED SIMULATION; CORRECTIONS; DETECTION; DUSTS; EMISSION; GALAXIES; GHZ RANGE; LYMAN LINES; MAGELLANIC CLOUDS; MONTE CARLO METHOD; RED SHIFT; RESOLUTION; SPACE; STARS; TELESCOPES

Citation Formats


                    To, Chun-Hao, Wang, Wei-Hao, and Owen, Frazer N. Star formation rate and extinction in faint z ∼ 4 Lyman break galaxies.  United States: N. p., 2014. 
        Web.  doi:10.1088/0004-637X/792/2/139.

Copy to clipboard


                    To, Chun-Hao, Wang, Wei-Hao, & Owen, Frazer N. Star formation rate and extinction in faint z ∼ 4 Lyman break galaxies.  United States.  https://doi.org/10.1088/0004-637X/792/2/139

Copy to clipboard


                    To, Chun-Hao, Wang, Wei-Hao, and Owen, Frazer N. 2014.  
        "Star formation rate and extinction in faint z ∼ 4 Lyman break galaxies".  United States.  https://doi.org/10.1088/0004-637X/792/2/139.

Copy to clipboard


                    
@article{osti_22365078,

  title        = {Star formation rate and extinction in faint z ∼ 4 Lyman break galaxies},

  author       = {To, Chun-Hao and Wang, Wei-Hao and Owen, Frazer N.},

  abstractNote = {We present a statistical detection of 1.5 GHz radio continuum emission from a sample of faint z ∼ 4 Lyman break galaxies (LBGs). To constrain their extinction and intrinsic star formation rate (SFR), we combine the latest ultradeep Very Large Array 1.5 GHz radio image and the Hubble Space Telescope Advanced Camera for Surveys (ACS) optical images in the GOODS-N. We select a large sample of 1771 z ∼ 4 LBGs from the ACS catalog using B {sub F435W}-dropout color criteria. Our LBG samples have I {sub F775W} ∼ 25-28 (AB), ∼0-3 mag fainter than M{sub UV}{sup ⋆} at z ∼ 4. In our stacked radio images, we find the LBGs to be point-like under our 2'' angular resolution. We measure their mean 1.5 GHz flux by stacking the measurements on the individual objects. We achieve a statistical detection of S {sub 1.5} {sub GHz} = 0.210 ± 0.075 μJy at ∼3σ for the first time on such a faint LBG population at z ∼ 4. The measurement takes into account the effects of source size and blending of multiple objects. The detection is visually confirmed by stacking the radio images of the LBGs, and the uncertainty is quantified with Monte Carlo simulations on the radio image. The stacked radio flux corresponds to an obscured SFR of 16.0 ± 5.7 M {sub ☉} yr{sup –1}, and implies a rest-frame UV extinction correction factor of 3.8. This extinction correction is in excellent agreement with that derived from the observed UV continuum spectral slope, using the local calibration of Meurer et al. This result supports the use of the local calibration on high-redshift LBGs to derive the extinction correction and SFR, and also disfavors a steep reddening curve such as that of the Small Magellanic Cloud.},

  doi          = {10.1088/0004-637X/792/2/139},

  url          = {https://www.osti.gov/biblio/22365078},
  journal      = {Astrophysical Journal},

  issn         = {0004-637X},

  number       = 2,

  volume       = 792,

  place        = {United States},

  year         = {Wed Sep 10 00:00:00 EDT 2014},

  month        = {Wed Sep 10 00:00:00 EDT 2014}

}

Copy to clipboard

Journal Article:

https://doi.org/10.1088/0004-637X/792/2/139

Other availability

Find in Google Scholar

Search WorldCat to find libraries that may hold this journal

Save / Share:

Export Metadata

Save to My Library

Similar records in OSTI.GOV collections:

DUST OBSCURATION IN LYMAN BREAK GALAXIES AT z {approx} 4

Journal Article Ho, I-Ting; Wang, Wei-Hao; Morrison, Glenn - Astrophysical Journal

Measuring star formation rates (SFRs) in high-z galaxies with their rest-frame ultraviolet (UV) continuum can be uncertain because of dust obscuration. Prior studies had used the submillimeter emission at 850 {mu}m to determine the intrinsic SFRs of rest-frame UV-selected galaxies, but the results suffered from the low sensitivity and poor resolution ({approx}15''). Here, we use ultradeep Very Large Array 1.4 GHz images with {approx}1''-2'' resolutions to measure the intrinsic SFRs. We perform stacking analyses in the radio images centered on {approx}3500 Lyman break galaxies (LBGs) at z {approx} 4 in the Great Observatories Origins Deep Survey-North and South fields selectedmore »« less
https://doi.org/10.1088/0004-637X/722/2/1051
PRECISE IDENTIFICATIONS OF SUBMILLIMETER GALAXIES: MEASURING THE HISTORY OF MASSIVE STAR-FORMING GALAXIES TO z > 5 {sup ,} {sup ,}

Journal Article Barger, A.; Wang, W.; Cowie, L.; ... - Astrophysical Journal

We carried out extremely sensitive Submillimeter Array (SMA) 340 GHz (860 {mu}m) continuum imaging of a complete sample of SCUBA 850 {mu}m sources (>4{sigma}) with fluxes >3 mJy in the GOODS-N. Using these data and new SCUBA-2 data, we do not detect 4 of the 16 SCUBA sources, and we rule out the original SCUBA fluxes at the 4{sigma} level. Three more resolve into multiple fainter SMA galaxies, suggesting that our understanding of the most luminous high-redshift dusty galaxies may not be as reliable as we thought. 10 of the 16 independent SMA sources have spectroscopic redshifts (optical/infrared or CO)more »« less
https://doi.org/10.1088/0004-637X/761/2/89
Is there a maximum star formation rate in high-redshift galaxies? , , ,

Journal Article Barger, A.; Cowie, L.; Chen, C.; ... - Astrophysical Journal

We use the James Clerk Maxwell Telescope's SCUBA-2 camera to image a 400 arcmin{sup 2} area surrounding the GOODS-N field. The 850 μm rms noise ranges from a value of 0.49 mJy in the central region to 3.5 mJy at the outside edge. From these data, we construct an 850 μm source catalog to 2 mJy containing 49 sources detected above the 4σ level. We use an ultradeep (11.5 μJy at 5σ) 1.4 GHz image obtained with the Karl G. Jansky Very Large Array together with observations made with the Submillimeter Array to identify counterparts to the submillimeter galaxies. Formore »« less
https://doi.org/10.1088/0004-637X/784/1/9
NARROWBAND IMAGING OF ESCAPING LYMAN-CONTINUUM EMISSION IN THE SSA22 FIELD

Journal Article Nestor, Daniel; Shapley, Alice; Steidel, Charles; ... - Astrophysical Journal

We present the results of an ultradeep, narrowband imaging survey for Lyman-continuum (LyC) emission at z {approx} 3 in the SSA22a field. We employ a custom narrowband filter centered at {lambda} = 3640 A (NB3640), which probes the LyC region for galaxies at z {>=} 3.06. We also analyze new and archival NB4980 imaging tuned to the wavelength of the Ly{alpha} emission line at z = 3.09, and archival broadband B, V, and R images of the non-ionizing UV continuum. Our NB3640 images contain 26 z {>=} 3.06 Lyman break galaxies (LBGs) as well as a set of 130 Ly{alpha}more »« less
https://doi.org/10.1088/0004-637X/736/1/18
STAR FORMATION RATES FOR STARBURST GALAXIES FROM ULTRAVIOLET, INFRARED, AND RADIO LUMINOSITIES

Journal Article Sargsyan, Lusine - Astrophysical Journal

We present a comparison of star formation rates (SFR) determined from mid-infrared 7.7 {mu}m polycyclic aromatic hydrocarbon (PAH) luminosity [SFR(PAH)], from 1.4 GHz radio luminosity [SFR(radio)], and from far-ultraviolet luminosity [SFR(UV)] for a sample of 287 starburst galaxies with z < 0.5 having Spitzer IRS observations. The previously adopted relation log [SFR(PAH)] = log [{nu}L {sub {nu}}(7.7 {mu}m)] - 42.57 {+-} 0.2, for SFR in M{sub sun} yr{sup -1} and {nu}L {sub {nu}}(7.7 {mu}m) the luminosity at the peak of the 7.7 {mu}m PAH feature in erg s{sup -1}, is found to agree with SFR(radio). Comparing with SFR(UV) determined independentlymore »« less
https://doi.org/10.1088/0004-637X/701/2/1398; COUNTRY OF INPUT: INTERNATIONAL ATOMIC ENERGY AGENCY (IAEA)

Similar Records