Emission and gas kinematics in a lyman-alpha blob at z ∼ 3.1

Emily M. McLinden, Sangeeta Malhotra, James E. Rhoads, Pascale Hibon, Anne Marie Weijmans, Vithal Tilvi

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

We present spectroscopic measurements of the [O III] emission line from two subregions of strong Lyα emission in a radio-quiet Lyman-alpha blob (LAB). The blob under study is LAB1 at z ∼ 3.1, and the [O III] detections are from the two Lyman break galaxies (LBGs) embedded in the blob halo. The [O III] measurements were made with LUCIFER on the 8.4 m Large Binocular Telescope and NIRSPEC on 10 m Keck Telescope. Comparing the redshift of the [O III] measurements to Lyα redshifts from SAURON allows us to take a step toward understanding the kinematics of the gas in the blob. Using both LUCIFER and NIRSPEC we find velocity offsets between the [O III] and Lyα redshifts that are modestly negative or consistent with 0 km s-1 in both subregions studied (ranging from -72 ± 42- + 6 ± 33 km s -1). A negative offset means Lyα is blueshifted with respect to [O III] a positive offset then implies Lyα is redshifted with respect to [O III]. These results may imply that outflows are not primarily responsible for Lyman alpha escape in this LAB, since outflows are generally expected to produce a positive velocity offset. In addition, we present an [O III] line flux upper limit on a third region of LAB1, a region that is unassociated with any underlying galaxy. We find that the [O III] upper limit from the galaxy-unassociated region of the blob is at least 1.4-2.5 times fainter than the [O III] flux from one of the LBG-associated regions and has an [O III] to Lyα ratio measured at least 1.9-3.4 times smaller than the same ratio measured from one of the LBGs.

Original languageEnglish (US)
Article number48
JournalAstrophysical Journal
Volume767
Issue number1
DOIs
StatePublished - Apr 10 2013

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kinematics
galaxies
gases
gas
outflow
telescopes
escape
radio
halos

Keywords

  • galaxies: high-redshift
  • galaxies: kinematics and dynamics
  • intergalactic medium

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

McLinden, E. M., Malhotra, S., Rhoads, J. E., Hibon, P., Weijmans, A. M., & Tilvi, V. (2013). Emission and gas kinematics in a lyman-alpha blob at z ∼ 3.1. Astrophysical Journal, 767(1), [48]. https://doi.org/10.1088/0004-637X/767/1/48

Emission and gas kinematics in a lyman-alpha blob at z ∼ 3.1. / McLinden, Emily M.; Malhotra, Sangeeta; Rhoads, James E.; Hibon, Pascale; Weijmans, Anne Marie; Tilvi, Vithal.

In: Astrophysical Journal, Vol. 767, No. 1, 48, 10.04.2013.

Research output: Contribution to journalArticle

McLinden, EM, Malhotra, S, Rhoads, JE, Hibon, P, Weijmans, AM & Tilvi, V 2013, 'Emission and gas kinematics in a lyman-alpha blob at z ∼ 3.1', Astrophysical Journal, vol. 767, no. 1, 48. https://doi.org/10.1088/0004-637X/767/1/48
McLinden EM, Malhotra S, Rhoads JE, Hibon P, Weijmans AM, Tilvi V. Emission and gas kinematics in a lyman-alpha blob at z ∼ 3.1. Astrophysical Journal. 2013 Apr 10;767(1). 48. https://doi.org/10.1088/0004-637X/767/1/48
McLinden, Emily M. ; Malhotra, Sangeeta ; Rhoads, James E. ; Hibon, Pascale ; Weijmans, Anne Marie ; Tilvi, Vithal. / Emission and gas kinematics in a lyman-alpha blob at z ∼ 3.1. In: Astrophysical Journal. 2013 ; Vol. 767, No. 1.
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abstract = "We present spectroscopic measurements of the [O III] emission line from two subregions of strong Lyα emission in a radio-quiet Lyman-alpha blob (LAB). The blob under study is LAB1 at z ∼ 3.1, and the [O III] detections are from the two Lyman break galaxies (LBGs) embedded in the blob halo. The [O III] measurements were made with LUCIFER on the 8.4 m Large Binocular Telescope and NIRSPEC on 10 m Keck Telescope. Comparing the redshift of the [O III] measurements to Lyα redshifts from SAURON allows us to take a step toward understanding the kinematics of the gas in the blob. Using both LUCIFER and NIRSPEC we find velocity offsets between the [O III] and Lyα redshifts that are modestly negative or consistent with 0 km s-1 in both subregions studied (ranging from -72 ± 42- + 6 ± 33 km s -1). A negative offset means Lyα is blueshifted with respect to [O III] a positive offset then implies Lyα is redshifted with respect to [O III]. These results may imply that outflows are not primarily responsible for Lyman alpha escape in this LAB, since outflows are generally expected to produce a positive velocity offset. In addition, we present an [O III] line flux upper limit on a third region of LAB1, a region that is unassociated with any underlying galaxy. We find that the [O III] upper limit from the galaxy-unassociated region of the blob is at least 1.4-2.5 times fainter than the [O III] flux from one of the LBG-associated regions and has an [O III] to Lyα ratio measured at least 1.9-3.4 times smaller than the same ratio measured from one of the LBGs.",
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AU - Weijmans, Anne Marie

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AB - We present spectroscopic measurements of the [O III] emission line from two subregions of strong Lyα emission in a radio-quiet Lyman-alpha blob (LAB). The blob under study is LAB1 at z ∼ 3.1, and the [O III] detections are from the two Lyman break galaxies (LBGs) embedded in the blob halo. The [O III] measurements were made with LUCIFER on the 8.4 m Large Binocular Telescope and NIRSPEC on 10 m Keck Telescope. Comparing the redshift of the [O III] measurements to Lyα redshifts from SAURON allows us to take a step toward understanding the kinematics of the gas in the blob. Using both LUCIFER and NIRSPEC we find velocity offsets between the [O III] and Lyα redshifts that are modestly negative or consistent with 0 km s-1 in both subregions studied (ranging from -72 ± 42- + 6 ± 33 km s -1). A negative offset means Lyα is blueshifted with respect to [O III] a positive offset then implies Lyα is redshifted with respect to [O III]. These results may imply that outflows are not primarily responsible for Lyman alpha escape in this LAB, since outflows are generally expected to produce a positive velocity offset. In addition, we present an [O III] line flux upper limit on a third region of LAB1, a region that is unassociated with any underlying galaxy. We find that the [O III] upper limit from the galaxy-unassociated region of the blob is at least 1.4-2.5 times fainter than the [O III] flux from one of the LBG-associated regions and has an [O III] to Lyα ratio measured at least 1.9-3.4 times smaller than the same ratio measured from one of the LBGs.

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