DETECTION OF LENSING SUBSTRUCTURE USING ALMA OBSERVATIONS OF THE DUSTY GALAXY SDP.81
We study the abundance of substructure in the matter density near galaxies using ALMA Science Verification observations of the strong lensing system SDP. 81. We present a method to measure the abundance of subhalos around galaxies using interferometric observations of gravitational lenses. Using sim...
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ndltd-arizona.edu-oai-arizona.openrepository.com-10150-6212612016-11-05T03:00:33Z DETECTION OF LENSING SUBSTRUCTURE USING ALMA OBSERVATIONS OF THE DUSTY GALAXY SDP.81 Hezaveh, Yashar D. Dalal, Neal Marrone, Daniel P. Mao, Yao-Yuan Morningstar, Warren Wen, Di Blandford, Roger D. Carlstrom, John E. Fassnacht, Christopher D. Holder, Gilbert P. Kemball, Athol Marshall, Philip J. Murray, Norman Levasseur, Laurence Perreault Vieira, Joaquin D. Wechsler, Risa H. Univ Arizona, Steward Observ dark matter gravitational lensing strong We study the abundance of substructure in the matter density near galaxies using ALMA Science Verification observations of the strong lensing system SDP. 81. We present a method to measure the abundance of subhalos around galaxies using interferometric observations of gravitational lenses. Using simulated ALMA observations we explore the effects of various systematics, including antenna phase errors and source priors, and show how such errors may be measured or marginalized. We apply our formalism to ALMA observations of SDP. 81. We find evidence for the presence of a M = 10(8.96 +/- 0.12)M(circle dot) subhalo near one of the images, with a significance of 6.9 sigma in a joint fit to data from bands 6 and 7; the effect of the subhalo is also detected in both bands individually. We also derive constraints on the abundance of dark matter (DM) subhalos down to M similar to 2 x 10(7) M-circle dot, pushing down to the mass regime of the smallest detected satellites in the Local Group, where there are significant discrepancies between the observed population of luminous galaxies and predicted DM subhalos. We find hints of additional substructure, warranting further study using the full SDP. 81 data set (including, for example, the spectroscopic imaging of the lensed carbon monoxide emission). We compare the results of this search to the predictions of Lambda CDM halos, and find that given current uncertainties in the host halo properties of SDP. 81, our measurements of substructure are consistent with theoretical expectations. Observations of larger samples of gravitational lenses with ALMA should be able to improve the constraints on the abundance of galactic substructure. 2016-05-19 Article DETECTION OF LENSING SUBSTRUCTURE USING ALMA OBSERVATIONS OF THE DUSTY GALAXY SDP.81 2016, 823 (1):37 The Astrophysical Journal 1538-4357 10.3847/0004-637X/823/1/37 http://hdl.handle.net/10150/621261 http://arizona.openrepository.com/arizona/handle/10150/621261 The Astrophysical Journal en http://stacks.iop.org/0004-637X/823/i=1/a=37?key=crossref.fafd9bda5aeae3731380470532cee3f6 © 2016. The American Astronomical Society. All rights reserved. IOP PUBLISHING LTD |
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language |
en |
sources |
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topic |
dark matter gravitational lensing strong |
spellingShingle |
dark matter gravitational lensing strong Hezaveh, Yashar D. Dalal, Neal Marrone, Daniel P. Mao, Yao-Yuan Morningstar, Warren Wen, Di Blandford, Roger D. Carlstrom, John E. Fassnacht, Christopher D. Holder, Gilbert P. Kemball, Athol Marshall, Philip J. Murray, Norman Levasseur, Laurence Perreault Vieira, Joaquin D. Wechsler, Risa H. DETECTION OF LENSING SUBSTRUCTURE USING ALMA OBSERVATIONS OF THE DUSTY GALAXY SDP.81 |
description |
We study the abundance of substructure in the matter density near galaxies using ALMA Science Verification observations of the strong lensing system SDP. 81. We present a method to measure the abundance of subhalos around galaxies using interferometric observations of gravitational lenses. Using simulated ALMA observations we explore the effects of various systematics, including antenna phase errors and source priors, and show how such errors may be measured or marginalized. We apply our formalism to ALMA observations of SDP. 81. We find evidence for the presence of a M = 10(8.96 +/- 0.12)M(circle dot) subhalo near one of the images, with a significance of 6.9 sigma in a joint fit to data from bands 6 and 7; the effect of the subhalo is also detected in both bands individually. We also derive constraints on the abundance of dark matter (DM) subhalos down to M similar to 2 x 10(7) M-circle dot, pushing down to the mass regime of the smallest detected satellites in the Local Group, where there are significant discrepancies between the observed population of luminous galaxies and predicted DM subhalos. We find hints of additional substructure, warranting further study using the full SDP. 81 data set (including, for example, the spectroscopic imaging of the lensed carbon monoxide emission). We compare the results of this search to the predictions of Lambda CDM halos, and find that given current uncertainties in the host halo properties of SDP. 81, our measurements of substructure are consistent with theoretical expectations. Observations of larger samples of gravitational lenses with ALMA should be able to improve the constraints on the abundance of galactic substructure. |
author2 |
Univ Arizona, Steward Observ |
author_facet |
Univ Arizona, Steward Observ Hezaveh, Yashar D. Dalal, Neal Marrone, Daniel P. Mao, Yao-Yuan Morningstar, Warren Wen, Di Blandford, Roger D. Carlstrom, John E. Fassnacht, Christopher D. Holder, Gilbert P. Kemball, Athol Marshall, Philip J. Murray, Norman Levasseur, Laurence Perreault Vieira, Joaquin D. Wechsler, Risa H. |
author |
Hezaveh, Yashar D. Dalal, Neal Marrone, Daniel P. Mao, Yao-Yuan Morningstar, Warren Wen, Di Blandford, Roger D. Carlstrom, John E. Fassnacht, Christopher D. Holder, Gilbert P. Kemball, Athol Marshall, Philip J. Murray, Norman Levasseur, Laurence Perreault Vieira, Joaquin D. Wechsler, Risa H. |
author_sort |
Hezaveh, Yashar D. |
title |
DETECTION OF LENSING SUBSTRUCTURE USING ALMA OBSERVATIONS OF THE DUSTY GALAXY SDP.81 |
title_short |
DETECTION OF LENSING SUBSTRUCTURE USING ALMA OBSERVATIONS OF THE DUSTY GALAXY SDP.81 |
title_full |
DETECTION OF LENSING SUBSTRUCTURE USING ALMA OBSERVATIONS OF THE DUSTY GALAXY SDP.81 |
title_fullStr |
DETECTION OF LENSING SUBSTRUCTURE USING ALMA OBSERVATIONS OF THE DUSTY GALAXY SDP.81 |
title_full_unstemmed |
DETECTION OF LENSING SUBSTRUCTURE USING ALMA OBSERVATIONS OF THE DUSTY GALAXY SDP.81 |
title_sort |
detection of lensing substructure using alma observations of the dusty galaxy sdp.81 |
publisher |
IOP PUBLISHING LTD |
publishDate |
2016 |
url |
http://hdl.handle.net/10150/621261 http://arizona.openrepository.com/arizona/handle/10150/621261 |
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