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We have used the Xco conversion factor, Local Thermal Equilibrium and Large Velocity Gradient approximation to parametrize the cold and warm phase of the interstellar medium from five different low transitions of CO in the central 21"(kpc)…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-27 Nuria Piñol-Ferrer , Kambiz Fathi , Andreas Lundgren , Glenn van de Ven

We present the first interferometric HCN(J = 3-2) and HCO+(J = 3-2) maps in the circumnuclear region of NGC 1097, obtained with the Submillimeter Array. The goal is to study the characteristics of the dense gas associated with the starburst…

Cosmology and Nongalactic Astrophysics · Physics 2015-06-03 Pei-Ying Hsieh , Paul T. P. Ho , Kotaro Kohno , Chorng-Yuan Hwang , Satoki Matsushita

We use the first systematic data sets of CO molecular line emission in z~1-3 normal star forming galaxies for a comparison of the dependence of galaxy-averaged star formation rates on molecular gas masses at low and high redshifts, and in…

Multiple molecular lines are useful for studying the physical properties of multiphase star-forming gas in different types of galaxies. We probe the molecular gas throughout the disc of the spiral galaxy NGC~5033, hosting an active galactic…

Astrophysics of Galaxies · Physics 2021-05-25 Selçuk Topal

We use ALMA observations of CO(2-1) in 13 massive ($M_{\star}\gtrsim 10^{11} M_{\odot}$) post-starburst galaxies at $z\sim0.6$ to constrain the molecular gas content in galaxies shortly after they quench their major star-forming episode.…

We present the Evolution of molecular Gas in Normal Galaxies (EGNoG) survey, an observational study of molecular gas in 31 star-forming galaxies from z=0.05 to z=0.5, with stellar masses of (4-30)x10^10 M_Sun and star formation rates of…

Cosmology and Nongalactic Astrophysics · Physics 2015-06-15 Amber Bauermeister , Leo Blitz , Alberto D. Bolatto , Martin Bureau , Adam Leroy , Eve Ostriker , Peter J. Teuben , Tony Wong , Melvyn C. H. Wright

A decade of study has established that the molecular gas properties of star-forming galaxies follow coherent scaling relations out to z~3, suggesting remarkable regularity of the interplay between molecular gas, star formation, and stellar…

We present the results of 0.6"-resolution observations of CO J=3-2 line emission in 10 massive star-forming galaxies at z=2.2-2.5 with the Atacama Large Millimeter/submillimeter Array (ALMA). We compare the spatial extent of molecular gas…

Astrophysics of Galaxies · Physics 2023-10-24 Ken-ichi Tadaki , Tadayuki Kodama , Yusei Koyama , Tomoko L. Suzuki , Ikki Mitsuhashi , Ryota Ikeda

We investigate star formation at very early evolutionary phases in five massive clouds in the inner 500 pc of the Galaxy, the Central Molecular Zone. Using interferometer observations of H$_2$O masers and ultra-compact H II regions, we find…

Compiling data from literature and the ALMA archive, we show enhanced HCN(4-3)/HCO$^+$(4-3) and/or HCN(4-3)/CS(7-6) integrated intensity ratios in circumnuclear molecular gas around active galactic nuclei (AGNs) compared to those in…

We present observations of the dense molecular gas tracers HCN, HNC, and HCO+ in the J=1-0 transition using ALMA. We supplement our datasets with previous observations of CO J=1-0, which traces the total molecular gas content. We separate…

Astrophysics of Galaxies · Physics 2016-06-01 Maximilien R. P. Schirm , Christine D. Wilson , Suzanne C. Madden , Dave L. Clements

Surveying eighteen 12CO-bright galaxies from the ATLAS3D early-type galaxy sample with the Institut de Radio Astronomie Millim\'etrique (IRAM) 30m telescope, we detect 13CO(1-0) and 13CO(2-1) in all eighteen galaxies, HCN(1-0) in 12/18 and…

We have obtained the time and space-resolved star formation history (SFH) of M51a (NGC 5194) by fitting GALEX, SDSS, and near infrared pixel-by-pixel photometry to a comprehensive library of stellar population synthesis models drawn from…

Astrophysics of Galaxies · Physics 2018-05-24 Eric E. Martínez-García , Gustavo Bruzual , Gladis Magris C. , Rosa A. González-Lópezlira

This study explores the effects of different assumptions and systematics on the determination of the local, spatially resolved star formation law. Using four star formation rate (SFR) tracers (H\alpha with azimuthally averaged extinction…

As observations of molecular gas in galaxies are pushed to lower star formation rate galaxies at higher redshifts, it is becoming increasingly important to understand the conditions of the gas in these systems to properly infer their…

Cosmology and Nongalactic Astrophysics · Physics 2015-06-12 Amber Bauermeister , Leo Blitz , Alberto D. Bolatto , Martin Bureau , Peter J. Teuben , Tony Wong , Melvyn C. H. Wright

We study the molecular gas content and distribution in the Coma cluster spiral galaxy NGC 4848. Plateau de Bure interferometric CO(1-0) observations reveal a lopsided H_2 distribution with an off-center secondary maximum coincident with the…

Astrophysics · Physics 2009-11-06 B. Vollmer , J. Braine , C. Balkowski , V. Cayatte , W. J. Duschl

We present 5.2" x 2.6" resolution interferometry of CO J=1-0 emission from the starburst galaxy NGC 253. The high spatial resolution of these new data, in combination with recent high resolution maps of 13CO, HCN and near-infrared emission,…

Astrophysics · Physics 2009-11-10 T. A. D. Paglione , O. Yam , T. Tosaki , J. M. Jackson

We report the detection of the CO(2-1) emission line with a spatial resolution of 0.9 arcsec ($3.5 \mathrm{kpc}$) from the host galaxy of the fast radio burst (FRB), FRB 20191001A at $z=0.2340$, using the Atacama Large…

Astrophysics of Galaxies · Physics 2024-07-03 Itsuki Yamanaka , Bunyo Hatsukade , Fumi Egusa , Tetsuya Hashimoto , Yuu Niino , Tzu-Yin Hsu , Hiroyuki Kaneko , Kotaro Kohno

We obtained CO(2-1) observations of seven GRB hosts with the APEX and IRAM 30m telescopes. We analysed these data together with all other hosts with previous CO observations. We obtained detections for 3 GRB hosts (980425, 080207, and…