Y. Ao - National Astronomical Observatory of Japan, Japan

Y. Ao
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Y. Ao
National Astronomical Observatory of Japan, Japan

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Astrophysics of Galaxies (11)
Cosmology and Nongalactic Astrophysics (4)
Astrophysics (3)
Mathematics - Analysis of PDEs (1)

Publications Authored By Y. Ao

We study the heating mechansims and Ly{\alpha} escape fractions of 35 Ly{\alpha} blobs (LABs) at z = 3.1 in the SSA22 field, using the submillimeter (submm) data from the ALMA and the SCUBA-2 on the JCMT, and the radio data from the VLA. With ALMA and JCMT/SCUBA-2, we have identified dust continuum sources in 11 out of 35 LABs in the SSA22 field, with star formation rates (SFRs) of above 100Msun/yr. Read More

The identification of high-redshift massive galaxies with old stellar populations may pose challenges to some models of galaxy formation. However, to securely classify a galaxy as quiescent, it is necessary to exclude significant ongoing star formation, something that can be challenging to achieve at high redshift. In this letter, we analyse deep ALMA/870um and SCUBA-2/450um imaging of the claimed "post-starburst" galaxy ZF-20115 at z=3. Read More

We report the identification of four millimeter line emitting galaxies with the Atacama Large Milli/submillimeter Array (ALMA) in SSA22 Field (ADF22). We analyze the ALMA 1.1 mm survey data, with an effective survey area of 5 arcmin$^2$, a frequency range of 253. Read More

We report the result from observations conducted with the Atacama Large Millimeter/submillimeter Array (ALMA) to detect [CII] 158 um fine structure line emission from galaxies embedded in one of the most spectacular Lyman-alpha blobs (LABs) at z=3.1, SSA22-LAB1. Of three dusty star-forming galaxies previously discovered by ALMA 860 um dust continuum survey toward SSA22-LAB1, we detected the [CII] line from one, LAB1-ALMA3 at z=3. Read More

In this paper, we consider a class of nonlinear Choquard equations with critical growth, and we show the existence of solutions of the equations. Besides, we consider the corresponding minimizing problem and prove the existence of a minimizer. Read More

We present new Atacama Large Millimeter/Submillimeter Array (ALMA) 850um continuum observations of the original Lyman-alpha Blob (LAB) in the SSA22 field at z=3.1 (SSA22-LAB01). The ALMA map resolves the previously identified submillimeter source into three components with total flux density S_850 = 1. Read More

The Galactic center is the closest region in which we can study star formation under extreme physical conditions like those in high-redshift galaxies. We measure the temperature of the dense gas in the central molecular zone (CMZ) and examine what drives it. We mapped the inner 300 pc of the CMZ in the temperature-sensitive J = 3-2 para-formaldehyde (p-H$_2$CO) transitions. Read More

Lyman alpha blobs (LABs) are spatially extended lyman alpha nebulae seen at high redshift. The origin of Lyman alpha emission in the LABs is still unclear and under debate. To study their heating mechanism(s), we present Australia Telescope Compact Array (ATCA) observations of the 20 cm radio emission and Herschel PACS and SPIRE measurements of the far-infrared (FIR) emission towards the four LABs in the protocluster J2143-4423 at z=2. Read More

Affiliations: 1Joint ALMA Observatory, Chile, 2Joint ALMA Observatory, Chile, 3National Radio Astronomy Observatory, Charlottesville, USA, 4National Radio Astronomy Observatory, Charlottesville, USA, 5National Radio Astronomy Observatory, Socorro, USA, 6European Southern Observatory, Germany, 7National Radio Astronomy Observatory, Charlottesville, USA, 8Joint ALMA Observatory, Chile, 9IRAM, France, 10European Southern Observatory, Germany, 11Institute of Astronomy and Astrophysics, Academia Sinica, Taiwan, 12Joint ALMA Observatory, Chile, 13Joint ALMA Observatory, Chile, 14Joint ALMA Observatory, Chile, 15National Astronomical Observatory of Japan, Japan, 16Joint ALMA Observatory, Chile, 17Astrophysics Group, Cavendish Laboratory, Cambridge, UK, 18Joint ALMA Observatory, Chile, 19Joint ALMA Observatory, Chile, 20Istituto di Radioastronomia, Bologna, Italy, 21Institut de Planetologie et d'Astrophysique de Grenoble, France, 22Istituto di Radioastronomia, Bologna, Italy, 23Joint ALMA Observatory, Chile, 24Joint ALMA Observatory, Chile, 25Jodrell Bank Centre for Astrophysics, University of Manchester, UK, 26Joint ALMA Observatory, Chile, 27European Southern Observatory, Alonso de Córdova 3107, Vitacura, Santiago, Chile, 28IRAM, France, 29Joint ALMA Observatory, Chile, 30Joint ALMA Observatory, Chile, 31Joint ALMA Observatory, Chile, 32Joint ALMA Observatory, Chile, 33Joint ALMA Observatory, Chile, 34European Southern Observatory, Alonso de Córdova 3107, Vitacura, Santiago, Chile, 35Joint ALMA Observatory, Chile, 36European Southern Observatory, Germany, 37Korea Astronomy and Space Science Institute, Korea, 38Joint ALMA Observatory, Chile, 39European Southern Observatory, Germany, 40Joint ALMA Observatory, Chile, 41Joint ALMA Observatory, Chile, 42Istituto di Radioastronomia, Bologna, Italy, 43Astrophysics Group, Cavendish Laboratory, Cambridge, UK, 44Joint ALMA Observatory, Chile, 45Joint ALMA Observatory, Chile, 46Joint ALMA Observatory, Chile, 47European Southern Observatory, Alonso de Córdova 3107, Vitacura, Santiago, Chile, 48Joint ALMA Observatory, Chile, 49Joint ALMA Observatory, Chile, 50Leiden Observatory, Leiden University, The Netherlands, 51Joint ALMA Observatory, Chile, 52European Southern Observatory, Alonso de Córdova 3107, Vitacura, Santiago, Chile, 53Joint ALMA Observatory, Chile, 54National Astronomical Observatory of Japan, Japan, 55National Research Council Herzberg Astronomy & Astrophysics, Canada, 56National Astronomical Observatory of Japan, Japan, 57European Southern Observatory, Germany, 58National Radio Astronomy Observatory, Charlottesville, USA, 59National Astronomical Observatory of Japan, Japan, 60European Southern Observatory, Germany, 61National Radio Astronomy Observatory, Charlottesville, USA, 62Joint ALMA Observatory, Chile, 63IRAM, France, 64Joint ALMA Observatory, Chile, 65Joint ALMA Observatory, Chile, 66Joint ALMA Observatory, Chile, 67Joint ALMA Observatory, Chile, 68Joint ALMA Observatory, Chile, 69National Astronomical Observatory of Japan, Japan, 70European Southern Observatory, Alonso de Córdova 3107, Vitacura, Santiago, Chile, 71Argelander-Institute for Astronomy, Bonn, Germany, 72IRAM, France, 73Joint ALMA Observatory, Chile, 74National Radio Astronomy Observatory, Charlottesville, USA, 75Joint ALMA Observatory, Chile, 76Joint ALMA Observatory, Chile, 77Joint ALMA Observatory, Chile, 78Joint ALMA Observatory, Chile, 79Joint ALMA Observatory, Chile, 80National Radio Astronomy Observatory, Charlottesville, USA, 81National Astronomical Observatory of Japan, Japan

We present initial results of very high resolution Atacama Large Millimeter/submillimeter Array (ALMA) observations of the $z$=3.042 gravitationally lensed galaxy HATLAS J090311.6+003906 (SDP. Read More

We report mapping observations of the $^{12}$CO $J=3-2$, $4-3$, $6-5$, and $7-6$ transitions and the CI 492 GHz transition toward the central 40$''\times$40$''$ region of the Circinus galaxy, using the Atacama Pathfinder EXperiment (APEX) telescope. We also detected $^{13}$CO $J=3-2$ at the central position of Circinus. These observations are to date the highest CO transitions reported in Circinus. Read More

Using the IRAM 30-m telescope, CN and CO isotopologues have been measured toward the central regions of the nearby starburst galaxy NGC253 and the prototypical ultraluminous infrared galaxy Mrk231. In NGC253, the 12C/13C ratio is 40+-10. Assuming that the ratio also holds for the CO emitting gas, this yields 16O/18O = 145+-36 and 16O/17O = 1290+-365 and a 32S/34S ratio close to that measured for the local interstellar medium (20-25). Read More

We used the Atacama Pathfinder Experiment (APEX) 12 m telescope to observe the J_KaKc=3_03-2_02, 3_22-2_21, and 3_21-2_20 transitions of para-H_2CO at 218 GHz simultaneously to determine kinetic temperatures of the dense gas in the central molecular zone (CMZ) of our Galaxy. The map extends over approximately 40 arcmin x 8 arcmin (~100x20 pc^2) along the Galactic plane with a linear resolution of 1.2 pc. Read More

We present the detection of the ammonia (NH3) (J,K) = (1,1) to (4,4) and (6,6) inversion lines toward the prototypical Seyfert 2 galaxy NGC 1068, made with the Green Bank Telescope (GBT). This is the first detection of ammonia in a Seyfert galaxy. The ortho-to-para-NH3 abundance ratio suggests that the molecule was formed in a warm medium of at least 20 K. Read More

Using the IRAM 30m telescope and the Plateau de Bure interferometer we have detected the \ctwo and the CO 3$-$2, 4$-$3, 6$-$5, 7$-$6 transitions as well as the dust continuum at 3 and 1.2 mm towards the distant luminous infrared galaxy IRAS F10214+4724 at $z=2.286$. Read More

We present the Submillimeter Array observation of the CO J=2-1 transition towards the northern galaxy, ARP 302N, of the early merging system, ARP 302. Our high angular resolution observation reveals the extended spatial distribution of the molecular gas in ARP 302N. We find that the molecular gas has a very asymmetric distribution with two strong concentrations on either side of the center together with a weaker one offset by about 8 kpc to the north. Read More

We have imaged in CO(2-1) the molecular gas in NGC 1275 (Perseus A), the cD galaxy at the center of the Perseus Cluster, at a spatial resolution of $\sim$1 kpc over a central region of radius $\sim$ 10 kpc. Per A is known to contain $\sim$1.3x10$^{10}$ M$_\odot$ of molecular gas, which has been proposed to be captured from mergers with or ram-pressure stripping of gas-rich galaxies, or accreted from a X-ray cooling flow. Read More