The young and the dustless: Interpreting radio observations of ultraviolet-luminous galaxies

Antara R. Basu-Zych, David Schiminovich, Benjamin D. Johnson, Charles Hoopes, Roderik Overzier, Marie A. Treyer, Timothy M. Heckman, Tom A. Barlow, Luciana Bianchi, Tim Conrow, José Donas, Karl G. Forster, Peter G. Friedman, Young-Wook Lee, Barry F. Madore, D. Christopher Martin, Bruno Milliard, Patrick Morrissey, Susan G. Neff, R. Michael RichSamir Salim, Mark Seibert, Todd A. Small, Alex S. Szalay, Ted K. Wyder, Sukyoung Yi

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Abstract

Ultraviolet-luminous galaxies (UVLGs) have been identified as intensely star-forming nearby galaxies. A subset of these, the supercompact UVLGs, are believed to be local analogs of high-redshift Lyman break galaxies. Here we investigate the radio continuum properties of this important population for the first time. We have observed 42 super-compact UVLGs with the VLA, all of which have extensive coverage in the UV/optical by GALEX and SDSS. Our analysis includes comparison samples of multiwavelength data from the Spitzer First Look Survey and from the SDSS-GALEX matched catalogs. In addition we have Spitzer MIPS data for 24 of our galaxies and find that they fall on the radio-FIR correlation of normal star-forming galaxies. We find that our galaxies have lower radio to UV ratios and lower Balmer decrements than other local galaxies with similar (high) star formation rates. Optical spectra show they have lower Dn (4000) and HδA indices, higher Hβ emission-line equivalent widths, and higher [O III]5007/Hβ emission-line ratios than normal star-forming galaxies. Comparing these results to galaxy spectral evolution models we conclude that supercompact UVLGs are distinguished from normal star-forming galaxies firstly by their high specific star formation rates. Moreover, compared to other types of galaxies with similar star formation rates, they have significantly less dust attenuation. In both regards they are similar to Lyman break galaxies. This suggests that the process that causes star formation in the supercompact UVLGs differs from other local star-forming galaxies, but may be similar to Lyman break galaxies.

Original languageEnglish
Pages (from-to)457-470
Number of pages14
JournalAstrophysical Journal, Supplement Series
Volume173
Issue number2
DOIs
Publication statusPublished - 2007 Dec 1

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radio observation
radio
galaxies
dust
stars
star formation rate
rate
young

All Science Journal Classification (ASJC) codes

  • Space and Planetary Science

Cite this

Basu-Zych, A. R., Schiminovich, D., Johnson, B. D., Hoopes, C., Overzier, R., Treyer, M. A., ... Yi, S. (2007). The young and the dustless: Interpreting radio observations of ultraviolet-luminous galaxies. Astrophysical Journal, Supplement Series, 173(2), 457-470. https://doi.org/10.1086/521146
Basu-Zych, Antara R. ; Schiminovich, David ; Johnson, Benjamin D. ; Hoopes, Charles ; Overzier, Roderik ; Treyer, Marie A. ; Heckman, Timothy M. ; Barlow, Tom A. ; Bianchi, Luciana ; Conrow, Tim ; Donas, José ; Forster, Karl G. ; Friedman, Peter G. ; Lee, Young-Wook ; Madore, Barry F. ; Martin, D. Christopher ; Milliard, Bruno ; Morrissey, Patrick ; Neff, Susan G. ; Rich, R. Michael ; Salim, Samir ; Seibert, Mark ; Small, Todd A. ; Szalay, Alex S. ; Wyder, Ted K. ; Yi, Sukyoung. / The young and the dustless : Interpreting radio observations of ultraviolet-luminous galaxies. In: Astrophysical Journal, Supplement Series. 2007 ; Vol. 173, No. 2. pp. 457-470.
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abstract = "Ultraviolet-luminous galaxies (UVLGs) have been identified as intensely star-forming nearby galaxies. A subset of these, the supercompact UVLGs, are believed to be local analogs of high-redshift Lyman break galaxies. Here we investigate the radio continuum properties of this important population for the first time. We have observed 42 super-compact UVLGs with the VLA, all of which have extensive coverage in the UV/optical by GALEX and SDSS. Our analysis includes comparison samples of multiwavelength data from the Spitzer First Look Survey and from the SDSS-GALEX matched catalogs. In addition we have Spitzer MIPS data for 24 of our galaxies and find that they fall on the radio-FIR correlation of normal star-forming galaxies. We find that our galaxies have lower radio to UV ratios and lower Balmer decrements than other local galaxies with similar (high) star formation rates. Optical spectra show they have lower Dn (4000) and HδA indices, higher Hβ emission-line equivalent widths, and higher [O III]5007/Hβ emission-line ratios than normal star-forming galaxies. Comparing these results to galaxy spectral evolution models we conclude that supercompact UVLGs are distinguished from normal star-forming galaxies firstly by their high specific star formation rates. Moreover, compared to other types of galaxies with similar star formation rates, they have significantly less dust attenuation. In both regards they are similar to Lyman break galaxies. This suggests that the process that causes star formation in the supercompact UVLGs differs from other local star-forming galaxies, but may be similar to Lyman break galaxies.",
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Basu-Zych, AR, Schiminovich, D, Johnson, BD, Hoopes, C, Overzier, R, Treyer, MA, Heckman, TM, Barlow, TA, Bianchi, L, Conrow, T, Donas, J, Forster, KG, Friedman, PG, Lee, Y-W, Madore, BF, Martin, DC, Milliard, B, Morrissey, P, Neff, SG, Rich, RM, Salim, S, Seibert, M, Small, TA, Szalay, AS, Wyder, TK & Yi, S 2007, 'The young and the dustless: Interpreting radio observations of ultraviolet-luminous galaxies', Astrophysical Journal, Supplement Series, vol. 173, no. 2, pp. 457-470. https://doi.org/10.1086/521146

The young and the dustless : Interpreting radio observations of ultraviolet-luminous galaxies. / Basu-Zych, Antara R.; Schiminovich, David; Johnson, Benjamin D.; Hoopes, Charles; Overzier, Roderik; Treyer, Marie A.; Heckman, Timothy M.; Barlow, Tom A.; Bianchi, Luciana; Conrow, Tim; Donas, José; Forster, Karl G.; Friedman, Peter G.; Lee, Young-Wook; Madore, Barry F.; Martin, D. Christopher; Milliard, Bruno; Morrissey, Patrick; Neff, Susan G.; Rich, R. Michael; Salim, Samir; Seibert, Mark; Small, Todd A.; Szalay, Alex S.; Wyder, Ted K.; Yi, Sukyoung.

In: Astrophysical Journal, Supplement Series, Vol. 173, No. 2, 01.12.2007, p. 457-470.

Research output: Contribution to journalArticle

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T2 - Interpreting radio observations of ultraviolet-luminous galaxies

AU - Basu-Zych, Antara R.

AU - Schiminovich, David

AU - Johnson, Benjamin D.

AU - Hoopes, Charles

AU - Overzier, Roderik

AU - Treyer, Marie A.

AU - Heckman, Timothy M.

AU - Barlow, Tom A.

AU - Bianchi, Luciana

AU - Conrow, Tim

AU - Donas, José

AU - Forster, Karl G.

AU - Friedman, Peter G.

AU - Lee, Young-Wook

AU - Madore, Barry F.

AU - Martin, D. Christopher

AU - Milliard, Bruno

AU - Morrissey, Patrick

AU - Neff, Susan G.

AU - Rich, R. Michael

AU - Salim, Samir

AU - Seibert, Mark

AU - Small, Todd A.

AU - Szalay, Alex S.

AU - Wyder, Ted K.

AU - Yi, Sukyoung

PY - 2007/12/1

Y1 - 2007/12/1

N2 - Ultraviolet-luminous galaxies (UVLGs) have been identified as intensely star-forming nearby galaxies. A subset of these, the supercompact UVLGs, are believed to be local analogs of high-redshift Lyman break galaxies. Here we investigate the radio continuum properties of this important population for the first time. We have observed 42 super-compact UVLGs with the VLA, all of which have extensive coverage in the UV/optical by GALEX and SDSS. Our analysis includes comparison samples of multiwavelength data from the Spitzer First Look Survey and from the SDSS-GALEX matched catalogs. In addition we have Spitzer MIPS data for 24 of our galaxies and find that they fall on the radio-FIR correlation of normal star-forming galaxies. We find that our galaxies have lower radio to UV ratios and lower Balmer decrements than other local galaxies with similar (high) star formation rates. Optical spectra show they have lower Dn (4000) and HδA indices, higher Hβ emission-line equivalent widths, and higher [O III]5007/Hβ emission-line ratios than normal star-forming galaxies. Comparing these results to galaxy spectral evolution models we conclude that supercompact UVLGs are distinguished from normal star-forming galaxies firstly by their high specific star formation rates. Moreover, compared to other types of galaxies with similar star formation rates, they have significantly less dust attenuation. In both regards they are similar to Lyman break galaxies. This suggests that the process that causes star formation in the supercompact UVLGs differs from other local star-forming galaxies, but may be similar to Lyman break galaxies.

AB - Ultraviolet-luminous galaxies (UVLGs) have been identified as intensely star-forming nearby galaxies. A subset of these, the supercompact UVLGs, are believed to be local analogs of high-redshift Lyman break galaxies. Here we investigate the radio continuum properties of this important population for the first time. We have observed 42 super-compact UVLGs with the VLA, all of which have extensive coverage in the UV/optical by GALEX and SDSS. Our analysis includes comparison samples of multiwavelength data from the Spitzer First Look Survey and from the SDSS-GALEX matched catalogs. In addition we have Spitzer MIPS data for 24 of our galaxies and find that they fall on the radio-FIR correlation of normal star-forming galaxies. We find that our galaxies have lower radio to UV ratios and lower Balmer decrements than other local galaxies with similar (high) star formation rates. Optical spectra show they have lower Dn (4000) and HδA indices, higher Hβ emission-line equivalent widths, and higher [O III]5007/Hβ emission-line ratios than normal star-forming galaxies. Comparing these results to galaxy spectral evolution models we conclude that supercompact UVLGs are distinguished from normal star-forming galaxies firstly by their high specific star formation rates. Moreover, compared to other types of galaxies with similar star formation rates, they have significantly less dust attenuation. In both regards they are similar to Lyman break galaxies. This suggests that the process that causes star formation in the supercompact UVLGs differs from other local star-forming galaxies, but may be similar to Lyman break galaxies.

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Basu-Zych AR, Schiminovich D, Johnson BD, Hoopes C, Overzier R, Treyer MA et al. The young and the dustless: Interpreting radio observations of ultraviolet-luminous galaxies. Astrophysical Journal, Supplement Series. 2007 Dec 1;173(2):457-470. https://doi.org/10.1086/521146