Spectroscopically Identified Emission Line Galaxy Pairs in the WISP Survey

Y. Sophia Dai; Matthew M. Malkan; Harry I. Teplitz; Claudia Scarlata; Anahita Alavi; Hakim Atek; Micaela Bagley; Ivano Baronchelli; Andrew Battisti; Andrew J. Bunker; Nimish P. Hathi; Alaina Henry; Jiasheng Huang; Gaoxiang Jin; Zijian Li; Crystal Martin; Vihang Mehta; John Phillips; Marc Rafelski; Michael Rutkowski; Hai Xu; Cong K. Xu; Anita Zanella

doi:10.3847/1538-4357/ac2f96

Spectroscopically Identified Emission Line Galaxy Pairs in the WISP Survey

Y. Sophia Dai, Matthew M. Malkan, Harry I. Teplitz, Claudia Scarlata, Anahita Alavi, Hakim Atek, Micaela Bagley, Ivano Baronchelli, Andrew Battisti, Andrew J. Bunker, Nimish P. Hathi, Alaina Henry, Jiasheng Huang, Gaoxiang Jin, Zijian Li, Crystal Martin, Vihang Mehta, John Phillips, Marc Rafelski, Michael RutkowskiHai Xu, Cong K. Xu, Anita Zanella

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Abstract

We identify a sample of spectroscopically measured emission line galaxy (ELG) Pairs up to z = 1.6 from the Wide Field Camera 3 (WFC3) Infrared Spectroscopic Parallels (WISP) survey. WISP obtained slitless, near-infrared grism spectroscopy along with direct imaging in the J and H bands by observing in the pure-parallel mode with the WFC3 on board the Hubble Space Telescope. From our search of 419 WISP fields covering an area of ∼0.5 deg2, we find 413 ELG pair systems, mostly H α emitters. We then derive reliable star formation rates (SFRs) based on the attenuation-corrected H α fluxes. Compared to isolated galaxies, we find an average SFR enhancement of 40%–65%, which is stronger for major Pairs and Pairs with smaller velocity separations (Δ v < 300 km s−1). Based on the stacked spectra from various subsamples, we study the trends of emission line ratios in pairs, and find a general consistency with enhanced lower ionization lines. We study the pair fraction among ELGs, and find a marginally significant increase with redshift f ∝ (1 + z) α , where the power-law index α = 0.58 ± 0.17 from z ∼ 0.2 to ∼1.6. The fraction of active galactic nuclei is found to be the same in the ELG Pairs as compared to the isolated ELGs.

Original language	English
Article number	156
Journal	Astrophysical Journal
Volume	923
Issue number	2
DOIs	https://doi.org/10.3847/1538-4357/ac2f96
Publication status	Published - 20 Dec 2021

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Dai, Y. S., Malkan, M. M., Teplitz, H. I., Scarlata, C., Alavi, A., Atek, H., Bagley, M., Baronchelli, I., Battisti, A., Bunker, A. J., Hathi, N. P., Henry, A., Huang, J., Jin, G., Li, Z., Martin, C., Mehta, V., Phillips, J., Rafelski, M., ... Zanella, A. (2021). Spectroscopically Identified Emission Line Galaxy Pairs in the WISP Survey. Astrophysical Journal, 923(2), Article 156. https://doi.org/10.3847/1538-4357/ac2f96

@article{f21d779e662f4552b2936055e04fb792,

title = "Spectroscopically Identified Emission Line Galaxy Pairs in the WISP Survey",

abstract = "We identify a sample of spectroscopically measured emission line galaxy (ELG) Pairs up to z = 1.6 from the Wide Field Camera 3 (WFC3) Infrared Spectroscopic Parallels (WISP) survey. WISP obtained slitless, near-infrared grism spectroscopy along with direct imaging in the J and H bands by observing in the pure-parallel mode with the WFC3 on board the Hubble Space Telescope. From our search of 419 WISP fields covering an area of ∼0.5 deg2, we find 413 ELG pair systems, mostly H α emitters. We then derive reliable star formation rates (SFRs) based on the attenuation-corrected H α fluxes. Compared to isolated galaxies, we find an average SFR enhancement of 40%–65%, which is stronger for major Pairs and Pairs with smaller velocity separations (Δ v < 300 km s−1). Based on the stacked spectra from various subsamples, we study the trends of emission line ratios in pairs, and find a general consistency with enhanced lower ionization lines. We study the pair fraction among ELGs, and find a marginally significant increase with redshift f ∝ (1 + z) α , where the power-law index α = 0.58 ± 0.17 from z ∼ 0.2 to ∼1.6. The fraction of active galactic nuclei is found to be the same in the ELG Pairs as compared to the isolated ELGs.",

author = "Dai, {Y. Sophia} and Malkan, {Matthew M.} and Teplitz, {Harry I.} and Claudia Scarlata and Anahita Alavi and Hakim Atek and Micaela Bagley and Ivano Baronchelli and Andrew Battisti and Bunker, {Andrew J.} and Hathi, {Nimish P.} and Alaina Henry and Jiasheng Huang and Gaoxiang Jin and Zijian Li and Crystal Martin and Vihang Mehta and John Phillips and Marc Rafelski and Michael Rutkowski and Hai Xu and Xu, {Cong K.} and Anita Zanella",

note = "Publisher Copyright: {\textcopyright} 2021. The Author(s). Published by the American Astronomical Society.",

year = "2021",

month = dec,

day = "20",

doi = "10.3847/1538-4357/ac2f96",

language = "English",

volume = "923",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "American Astronomical Society",

number = "2",

}

Dai, YS, Malkan, MM, Teplitz, HI, Scarlata, C, Alavi, A, Atek, H, Bagley, M, Baronchelli, I, Battisti, A, Bunker, AJ, Hathi, NP, Henry, A, Huang, J, Jin, G, Li, Z, Martin, C, Mehta, V, Phillips, J, Rafelski, M, Rutkowski, M, Xu, H, Xu, CK & Zanella, A 2021, 'Spectroscopically Identified Emission Line Galaxy Pairs in the WISP Survey', Astrophysical Journal, vol. 923, no. 2, 156. https://doi.org/10.3847/1538-4357/ac2f96

TY - JOUR

T1 - Spectroscopically Identified Emission Line Galaxy Pairs in the WISP Survey

AU - Dai, Y. Sophia

AU - Malkan, Matthew M.

AU - Teplitz, Harry I.

AU - Scarlata, Claudia

AU - Alavi, Anahita

AU - Atek, Hakim

AU - Bagley, Micaela

AU - Baronchelli, Ivano

AU - Battisti, Andrew

AU - Bunker, Andrew J.

AU - Hathi, Nimish P.

AU - Henry, Alaina

AU - Huang, Jiasheng

AU - Jin, Gaoxiang

AU - Li, Zijian

AU - Martin, Crystal

AU - Mehta, Vihang

AU - Phillips, John

AU - Rafelski, Marc

AU - Rutkowski, Michael

AU - Xu, Hai

AU - Xu, Cong K.

AU - Zanella, Anita

PY - 2021/12/20

Y1 - 2021/12/20

N2 - We identify a sample of spectroscopically measured emission line galaxy (ELG) Pairs up to z = 1.6 from the Wide Field Camera 3 (WFC3) Infrared Spectroscopic Parallels (WISP) survey. WISP obtained slitless, near-infrared grism spectroscopy along with direct imaging in the J and H bands by observing in the pure-parallel mode with the WFC3 on board the Hubble Space Telescope. From our search of 419 WISP fields covering an area of ∼0.5 deg2, we find 413 ELG pair systems, mostly H α emitters. We then derive reliable star formation rates (SFRs) based on the attenuation-corrected H α fluxes. Compared to isolated galaxies, we find an average SFR enhancement of 40%–65%, which is stronger for major Pairs and Pairs with smaller velocity separations (Δ v < 300 km s−1). Based on the stacked spectra from various subsamples, we study the trends of emission line ratios in pairs, and find a general consistency with enhanced lower ionization lines. We study the pair fraction among ELGs, and find a marginally significant increase with redshift f ∝ (1 + z) α , where the power-law index α = 0.58 ± 0.17 from z ∼ 0.2 to ∼1.6. The fraction of active galactic nuclei is found to be the same in the ELG Pairs as compared to the isolated ELGs.

AB - We identify a sample of spectroscopically measured emission line galaxy (ELG) Pairs up to z = 1.6 from the Wide Field Camera 3 (WFC3) Infrared Spectroscopic Parallels (WISP) survey. WISP obtained slitless, near-infrared grism spectroscopy along with direct imaging in the J and H bands by observing in the pure-parallel mode with the WFC3 on board the Hubble Space Telescope. From our search of 419 WISP fields covering an area of ∼0.5 deg2, we find 413 ELG pair systems, mostly H α emitters. We then derive reliable star formation rates (SFRs) based on the attenuation-corrected H α fluxes. Compared to isolated galaxies, we find an average SFR enhancement of 40%–65%, which is stronger for major Pairs and Pairs with smaller velocity separations (Δ v < 300 km s−1). Based on the stacked spectra from various subsamples, we study the trends of emission line ratios in pairs, and find a general consistency with enhanced lower ionization lines. We study the pair fraction among ELGs, and find a marginally significant increase with redshift f ∝ (1 + z) α , where the power-law index α = 0.58 ± 0.17 from z ∼ 0.2 to ∼1.6. The fraction of active galactic nuclei is found to be the same in the ELG Pairs as compared to the isolated ELGs.

UR - http://www.scopus.com/inward/record.url?scp=85122859188&partnerID=8YFLogxK

U2 - 10.3847/1538-4357/ac2f96

DO - 10.3847/1538-4357/ac2f96

M3 - Article

SN - 0004-637X

VL - 923

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 2

M1 - 156

ER -

Spectroscopically Identified Emission Line Galaxy Pairs in the WISP Survey

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