[{"id":4137,"link":"https:\/\/sfb1601.astro.uni-koeln.de\/space-debris-art-exhibition-by-iris-nitzl\/","name":"space-debris-art-exhibition-by-iris-nitzl","thumbnail":{"url":"https:\/\/sfb1601.astro.uni-koeln.de\/wp-content\/uploads\/2024\/09\/Explosion-e1725872141920.png","alt":"Iris Nitzl Art"},"title":"Space Debris - Art Exhibition by Iris Nitzl","excerpt":"","content":"September 9 to 13, during the Meeting of the Astronomical Society \"Space Debris\" shows lanes of debris found in the earth's orbits \u2013 more than 130 million pieces. According to","author":{"name":"admin","link":"https:\/\/sfb1601.astro.uni-koeln.de\/author\/admin\/"},"date":"Sep 9, 2024","dateGMT":"2024-09-09 08:58:13","modifiedDate":"2024-09-09 10:58:15","modifiedDateGMT":"2024-09-09 08:58:15","commentCount":"0","commentStatus":"open","categories":{"coma":"<a href=\"https:\/\/sfb1601.astro.uni-koeln.de\/category\/events\/\" rel=\"category tag\">events<\/a>","space":"<a href=\"https:\/\/sfb1601.astro.uni-koeln.de\/category\/events\/\" rel=\"category tag\">events<\/a>"},"taxonomies":{"post_tag":""},"readTime":{"min":0,"sec":17},"status":"publish"},{"id":4024,"link":"https:\/\/sfb1601.astro.uni-koeln.de\/b3-phangs-jwst-molecular-cloud-identification-using-7-7%ce%bcm-miri-data-z-bazzi-d-colombo-f-bigiel\/","name":"b3-phangs-jwst-molecular-cloud-identification-using-7-7%ce%bcm-miri-data-z-bazzi-d-colombo-f-bigiel","thumbnail":{"url":"https:\/\/sfb1601.astro.uni-koeln.de\/wp-content\/uploads\/2024\/09\/sfb1601_sep2024_image-scaled.jpg","alt":"Science Highlight B3 Sep24"},"title":"B3: PHANGS-JWST: Molecular cloud identification using 7.7\u03bcm MIRI data (Z. Bazzi, D. Colombo, F. Bigiel)","excerpt":"Stars form within molecular clouds, dense regions of cold gas primarily composed of molecular hydrogen. These clouds provide the necessary conditions for the formation of stars, including low temperatures and high densities, which allow gravitational forces to overcome thermal pressure and initiate the collapse of gas. To fully understand the process of star formation and therefore the evolution of galaxies, it is crucial to study the properties of molecular clouds\u2014such as their mass, density, distribution, and relation to the galactic environment.\n\nThe Physics at High Angular resolution in Nearby GalaxieS (PHANGS) collaboration aims to create a comprehensive view of star formation and the lifecycle of gas and dust in nearby galaxies, using state-of-the-art facilities. In particular, by leveraging the James Webb Space Telescope (JWST)\u2019s infrared capabilities, the PHANGS-JWST program has provided astonishing views of 19 galaxies in wavelengths that are typically obscured by dust in the optical range, reaching unprecedented resolutions and sensitivities.\n\nWe used observations of the emission from Polycyclic Aromatic Hydrocarbons (PAHs, e.g. complex organic molecules that emit strongly in the mid-infrared and are associated with photodissociation regions) from PHANGS-JWST to generate molecular gas maps of the 19 galaxies.\n\nThe application of the Spectral Clustering for Molecular Emission Segmentation (SCIMES) on the JWST data allowed the identification of more than 50,000 highly-resolved molecular clouds. SCIMES is a machine learning-based code that utilises graph theory concepts to segment out molecular clouds from the more diffuse medium by preserving their intrinsic morphology and internal structure.\n\nOur preliminary results suggest that the molecular cloud mass spectra\u2014specifically their steepness and truncation mass\u2014are strongly influenced by the surrounding dynamical environment. This indicates that certain physical conditions may be more favourable to the formation of high-mass clouds than others.\n\nFigure caption: Upper row: Left image shows the galaxy\u2019s intensity map; right image displays dust structures identified by SCIMES with a greyscale intensity background and a colour bar indicating 7.7 \u03bcm intensity. Bottom row: Cumulative mass distributions of molecular clouds in different environments. Dotted black lines represent simple power-law fits; solid black curves are truncated power-law fits. Fit parameters\u2014\u03b3 (spectral index), M0 (maximum mass), N0 (count in the distribution). The grey region represents the Poisson errors on the counts.","content":"Stars form within molecular clouds, dense regions of cold gas primarily composed of molecular hydrogen. These clouds provide the necessary conditions for the formation of stars, including low temperatures and","author":{"name":"admin","link":"https:\/\/sfb1601.astro.uni-koeln.de\/author\/admin\/"},"date":"Sep 3, 2024","dateGMT":"2024-09-03 05:53:42","modifiedDate":"2024-09-03 11:22:07","modifiedDateGMT":"2024-09-03 09:22:07","commentCount":"0","commentStatus":"closed","categories":{"coma":"<a href=\"https:\/\/sfb1601.astro.uni-koeln.de\/category\/science\/\" rel=\"category tag\">Science<\/a>","space":"<a href=\"https:\/\/sfb1601.astro.uni-koeln.de\/category\/science\/\" rel=\"category tag\">Science<\/a>"},"taxonomies":{"post_tag":""},"readTime":{"min":1,"sec":49},"status":"publish"},{"id":3403,"link":"https:\/\/sfb1601.astro.uni-koeln.de\/public-observatory-cologne\/","name":"public-observatory-cologne","thumbnail":{"url":"https:\/\/sfb1601.astro.uni-koeln.de\/wp-content\/uploads\/2024\/07\/Plakat_Monatsvortrage-9-11_2024.jpg","alt":""},"title":"Public Observatory Cologne","excerpt":"","content":"New guest talks are online, please have a look: https:\/\/sfb1601.astro.uni-koeln.de\/volkssternwarte\/ Plakat_Monatsvortr\u00e4ge 9-11_2024Download","author":{"name":"admin","link":"https:\/\/sfb1601.astro.uni-koeln.de\/author\/admin\/"},"date":"Aug 6, 2024","dateGMT":"2024-08-06 13:25:30","modifiedDate":"2024-09-03 08:04:45","modifiedDateGMT":"2024-09-03 06:04:45","commentCount":"0","commentStatus":"closed","categories":{"coma":"<a href=\"https:\/\/sfb1601.astro.uni-koeln.de\/category\/events\/\" rel=\"category tag\">events<\/a>, <a href=\"https:\/\/sfb1601.astro.uni-koeln.de\/category\/uncategorized\/\" rel=\"category tag\">Uncategorized<\/a>","space":"<a href=\"https:\/\/sfb1601.astro.uni-koeln.de\/category\/events\/\" rel=\"category tag\">events<\/a> <a href=\"https:\/\/sfb1601.astro.uni-koeln.de\/category\/uncategorized\/\" rel=\"category tag\">Uncategorized<\/a>"},"taxonomies":{"post_tag":""},"readTime":{"min":0,"sec":4},"status":"publish"},{"id":3883,"link":"https:\/\/sfb1601.astro.uni-koeln.de\/c6-constraining-warm-dark-matter-with-intensity-mapping-of-the-cii-fine-structure-line-elena-marcuzzo\/","name":"c6-constraining-warm-dark-matter-with-intensity-mapping-of-the-cii-fine-structure-line-elena-marcuzzo","thumbnail":{"url":"https:\/\/sfb1601.astro.uni-koeln.de\/wp-content\/uploads\/2024\/07\/final_constraints_mWDM_SFB.png","alt":""},"title":"C6: Constraining warm dark matter with intensity mapping of the [CII] fine-structure line (Elena Marcuzzo)","excerpt":"Line Intensity Mapping (LIM) is an emerging technique in radio-astronomy that scans vast fractions of the sky with a large beam and detects the integrated emission of all sources along the line of sight without resolving individual objects. This approach enables probing the high-redshift Universe including the contribution from intrinsically faint sources that traditional surveys miss due to their flux-limit thresholds. These peculiarities make LIM an ideal tool to probe the nature of dark matter (DM).\nMost particle-physics candidates for DM fall into the class of thermal relics (i.e. particles that were once in thermal equilibrium with the rest of the Universe). In this case, the velocity dispersion of the particles at early times turns out to be inversely proportional to their mass. This implies that less massive particles can freely stream out of shallow potential wells and, de facto, inhibit the formation of low-mass structures. Therefore, cold DM (CDM, with negligible velocity dispersion) and warm DM (WDM, with a free-streaming length of the order of 0.1 Mpc) give rise to a different mass spectrum of DM halos within which galaxy formation takes place.\n\nUsing the halo-model approach, we make forecasts for the constraints that LIM of the\u00a0150\u00a0\u03bcm\u00a0fine-structure transition of [Cii] can set on the mass of the DM particles. Ionised carbon is a promising tracer that should be present also in low-mass halos, contrary to neutral hydrogen that cannot be shielded from the UV background after cosmic reionisation. We compress the data into the isotropic power spectrum and use Bayesian inference marginalising over the uncertain faint-end slope of the [Cii] luminosity function (LF).\u00a0\n\nOur results are shown in the figure as a function of the survey area and for two different measurements of the bright-end of the [Cii] LF (optimistic\/pessimistic). Assuming a CDM scenario, we find that LIM can rule out WDM particle masses up to 2\u20133 keV, which makes this technique competitive with other probes, such as the Ly-\u03b1\u00a0forest. Our study demonstrates that, taking into account the current limits on the LF, the [Cii] power spectrum is dominated by sources hosted in relatively massive halos\u00a0and this diminishes\u00a0its constraining power on the WDM mass.\u00a0\n\nPaper: Marcuzzo et al. (2024)","content":"Line Intensity Mapping (LIM) is an emerging technique in radio-astronomy that scans vast fractions of the sky with a large beam and detects the integrated emission of all sources along","author":{"name":"admin","link":"https:\/\/sfb1601.astro.uni-koeln.de\/author\/admin\/"},"date":"Aug 1, 2024","dateGMT":"2024-08-01 04:22:00","modifiedDate":"2024-08-29 10:19:18","modifiedDateGMT":"2024-08-29 08:19:18","commentCount":"0","commentStatus":"open","categories":{"coma":"<a href=\"https:\/\/sfb1601.astro.uni-koeln.de\/category\/science\/\" rel=\"category tag\">Science<\/a>","space":"<a href=\"https:\/\/sfb1601.astro.uni-koeln.de\/category\/science\/\" rel=\"category tag\">Science<\/a>"},"taxonomies":{"post_tag":""},"readTime":{"min":1,"sec":48},"status":"publish"},{"id":3452,"link":"https:\/\/sfb1601.astro.uni-koeln.de\/next-sfb-1601-colloquium\/","name":"next-sfb-1601-colloquium","thumbnail":{"url":"https:\/\/sfb1601.astro.uni-koeln.de\/wp-content\/uploads\/2024\/06\/Poster_Colloquium_Gans.jpg","alt":""},"title":"Next SFB 1601 colloquium","excerpt":"","content":"The next SFB-colloquium will be on July 15 at 3 pm in lecture hall III of the physics institutes in Cologne. B\u00e9renger Gans from the Institut des Sciences Mol\u00e9culaires d\u2019Orsay,","author":{"name":"admin","link":"https:\/\/sfb1601.astro.uni-koeln.de\/author\/admin\/"},"date":"Jul 9, 2024","dateGMT":"2024-07-09 06:57:22","modifiedDate":"2024-07-09 09:12:30","modifiedDateGMT":"2024-07-09 07:12:30","commentCount":"0","commentStatus":"closed","categories":{"coma":"<a href=\"https:\/\/sfb1601.astro.uni-koeln.de\/category\/colloquium\/\" rel=\"category tag\">colloquium<\/a>","space":"<a href=\"https:\/\/sfb1601.astro.uni-koeln.de\/category\/colloquium\/\" rel=\"category tag\">colloquium<\/a>"},"taxonomies":{"post_tag":""},"readTime":{"min":0,"sec":14},"status":"publish"},{"id":3791,"link":"https:\/\/sfb1601.astro.uni-koeln.de\/c5-hyacinth-a-new-model-for-molecular-hydrogen-and-carbon-chemistry-in-cosmological-simulations-prachi-khatri\/","name":"c5-hyacinth-a-new-model-for-molecular-hydrogen-and-carbon-chemistry-in-cosmological-simulations-prachi-khatri","thumbnail":{"url":"https:\/\/sfb1601.astro.uni-koeln.de\/wp-content\/uploads\/2024\/07\/sfb_highlights_C5.png","alt":""},"title":"C5: HYACINTH \u2013 A New Model for Molecular Hydrogen and Carbon Chemistry in Cosmological Simulations (Prachi Khatri)","excerpt":"","content":"Modelling the molecular gas content of galaxies is a highly non-linear, multi-scale problem in astrophysics. On one hand, it is necessary to simulate galaxies in realistic environments as they are","author":{"name":"admin","link":"https:\/\/sfb1601.astro.uni-koeln.de\/author\/admin\/"},"date":"Jul 1, 2024","dateGMT":"2024-07-01 00:13:00","modifiedDate":"2024-06-25 13:25:18","modifiedDateGMT":"2024-06-25 11:25:18","commentCount":"0","commentStatus":"closed","categories":{"coma":"<a href=\"https:\/\/sfb1601.astro.uni-koeln.de\/category\/science\/\" rel=\"category tag\">Science<\/a>","space":"<a href=\"https:\/\/sfb1601.astro.uni-koeln.de\/category\/science\/\" rel=\"category tag\">Science<\/a>"},"taxonomies":{"post_tag":""},"readTime":{"min":1,"sec":29},"status":"publish"}]