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Active galactic nucleus (AGN) feedback is postulated as a key mechanism for regulating star formation within galaxies. Studying the physical properties of the outflowing gas from AGN is thus crucial for understanding the co-evolution of…

We investigate the relation between gas and star formation in sub-galactic regions, ~360 pc to ~1.5 kpc in size, within the nearby starburst dwarf NGC4449, in order to separate the underlying relation from the effects of sampling at varying…

We derive a physical model for the observed relations between star formation rate (SFR) and molecular line (CO and HCN) emission in galaxies, and show how these observed relations are reflective of the underlying star formation law. We do…

We use optical spectra from the inner 2$\times$3kpc$^2$ of the Seyfert 2 galaxy NGC1667, obtained with the GMOS integral field spectrograph on the Gemini South telescope at a spatial resolution of $\approx$ 240pc, to assess the feeding and…

Astrophysics of Galaxies · Physics 2017-01-18 Allan Schnorr-Müller , Thaisa Storchi-Bergmann , Fabricio Ferrari , Neil M. Nagar

We study the Kennicutt-Schmidt relation between average star formation rate and average cold gas surface density in the Hi dominated ISM of nearby spiral and dwarf irregular galaxies. We divide the galaxies into grid cells varying from…

Astrophysics of Galaxies · Physics 2015-06-24 Sambit Roychowdhury , Mei-Ling Huang , Guinevere Kauffmann , Jing Wang , Jayaram N. Chengalur

We combine mid-infrared diagnostics obtained from integral-field unit observations taken with MIRI/MRS on JWST with cold molecular gas information derived from ALMA observations of CO(1-0) emission to investigate the star formation rate and…

Astrophysics of Galaxies · Physics 2024-10-02 Lulu Zhang , Luis C. Ho

We study the CO and the radiocontinuum emission in an active galaxy to analyze the interplay between the central activity and the molecular gas. We present new high-resolution observations of the CO(1-0) and CO(2-1) emission lines, and 3.5…

We have conducted interferometric observations with CARMA and an OTF mapping with the 45-m telescope at NRO in the CO (J=1-0) emission line of NGC 3521. Combining these new data, together with CARMA+NRO45 data for M51a and archival SINGS…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-27 Guilin Liu , Jin Koda , Daniela Calzetti , Masayuki Fukuhara , Rieko Momose

We investigate the relation between the star formation rate surface density (Sigma_SFR) and the mass surface density of gas (Sigma_gas) in NGC 5194. VIRUS-P integral field spectroscopy is used to measure H-alpha, H-beta [NII]6548,6584, and…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-14 Guillermo A. Blanc , Amanda Heiderman , Karl Gebhardt , Neal J. Evans , Joshua Adams

We have measured gas and stellar velocity dispersions in 5 circumnuclear starforming regions (CNSFRs) and the nucleus of the barred spiral galaxy NGC 3351. The stellar dispersions have been obtained from high resolution spectra of the CaT…

We analyse the radio-to-submillimetre spectral energy distribution (SED) for the central pseudobulge of NGC~1365 using archival data from the Atacama Large Millimeter/submillimeter Array (ALMA) and the Very Large Array (VLA). This analysis…

Astrophysics of Galaxies · Physics 2024-04-15 Guangwen Chen , George J. Bendo , Gary A. Fuller , Hong-Xin Zhang , Xu Kong

The star formation rate (SFR) is one of the most fundamental parameters of galaxies, but nearly all of the standard SFR diagnostics are difficult to measure in active galaxies because of contamination from the active galactic nucleus (AGN).…

Astrophysics of Galaxies · Physics 2023-08-21 Ming-Yang Zhuang , Luis C. Ho , Jinyi Shangguan

We present the first XRISM/Resolve observations of the active galactic nucleus, NGC 1365, obtained in 2024 February and July. NGC 1365 is known for rapid transitions between Compton-thick and Compton-thin states, along with strong…

NGC 253 hosts the nearest nuclear starburst. Previous observations show a region rich in molecular gas, with dense clouds associated with recent star formation. We used ALMA to image the 350 GHz dust continuum and molecular line emission…

We present the star formation rate (SFR) measurements based on the spectral energy distribution (SED) analysis with new sub-mm fluxes combined with archival multi-wavelength data for a sample of 52 AGN host galaxies at z $<0.2$. We carried…

The star formation efficiency (SFE) has been shown to vary across different environments, particularly within galactic starbursts and deep within the bulges of galaxies. Various quenching mechanisms may be responsible, ranging from galactic…

High-resolution observations in the near infrared show star clusters around the active galactic nucleus (AGN) of the Seyfert 1 NGC2110, along with a 90 x 35 pc bar of shocked gas material around its nucleus. These are seen for the first…

Astrophysics of Galaxies · Physics 2015-06-18 Mark Durré , Jeremy Mould

We report high resolution 12CO(J = 2-1), 13CO(J = 2-1), and 12CO(J = 3-2) imaging of the Seyfert 1/starburst ring galaxy NGC 1097 with the Submillimeter Array to study the physical and kinematic properties of the 1-kpc circumnuclear…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-28 Pei-Ying Hsieh , Satoki Matsushita , Guilin Liu , Paul T. P. Ho , Nagisa Oi , Ya-Lin Wu

We present the measurements of gas and stellar velocity dispersions in 17 circumnuclear star-forming regions (CNSFRs) and the nuclei of three barred spiral galaxies: NGC2903, NGC3310 and NGC3351 from high dispersion spectra. The stellar…

Cosmology and Nongalactic Astrophysics · Physics 2012-05-17 G. F. Hagele , M. V. Cardaci , G. L. Bosch , A. I. Diaz , E. Terlevich , R. Terlevich