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6 results on '"Curti, M [0000-0002-2678-2560]"'

1. In-orbit Performance of the Near-Infrared Spectrograph NIRSpec on the James Webb Space Telescope

Author

Maiolino, Roberto, Böker, T. [0000-0002-5666-7782], Beck, T. L. [0000-0002-6881-0574], Birkmann, S. M. [0000-0001-7058-1726], Giardino, G. [0000-0002-9262-7155], Keyes, C. [0000-0002-4834-369X], Kumari, N. [0000-0002-5320-2568], Rawle, T. [0000-0002-7028-5588], Zeidler, P. [0000-0002-6091-7924], de Oliveira, C. Alves [0000-0003-2896-4138], Arribas, S. [0000-0001-7997-1640], Bechtold, K. [0000-0002-7722-6900], Bhatawdekar, R. [0000-0003-0883-2226], Bonaventura, N. [0000-0001-8470-7094], Cameron, A. J. [0000-0002-0450-7306], Carniani, S. [0000-0002-6719-380X], Charlot, S. [0000-0003-3458-2275], Curti, M. [0000-0002-2678-2560], Espinoza, N. [0000-0001-9513-1449], Ferruit, P. [0000-0001-8895-0606], Franx, M. [0000-0002-8871-3027], Jakobsen, P. [0000-0002-6780-2441], López-Caniego, M. [0000-0003-1016-9283], Lützgendorf, N. [0000-0002-4034-0080], Maiolino, R. [0000-0002-4985-3819], Manjavacas, E. [0000-0003-0192-6887], Marston, A. P. [0000-0001-5788-5258], Ogle, P. [0000-0002-3471-981X], Perna, M. [0000-0002-0362-5941], Peña-Guerrero, M. [0000-0003-2314-3453], Plesha, R. [0000-0002-2509-3878], Proffitt, C. R. [0000-0001-7617-5665], Rauscher, B. J. [0000-0003-2662-6821], del Pino, B. Rodríguez [0000-0001-5171-3930], Sabbi, E. [0000-0003-2954-7643], Sing, D. K. [0000-0001-6050-7645], Sirianni, M. [0000-0002-7626-6361], Úbeda, L. [0000-0001-7130-2880], Wahlgren, G. M. [0000-0002-6570-4776], Willott, Chris J. [0000-0002-4201-7367], and Apollo - University of Cambridge Repository

Subjects
Paper
Abstract

The Near-Infrared Spectrograph (NIRSpec) is one of the four focal plane instruments on the James Webb Space Telescope. In this paper, we summarize the in-orbit performance of NIRSpec, as derived from data collected during its commissioning campaign and the first few months of nominal science operations. More specifically, we discuss the performance of some critical hardware components such as the two NIRSpec Hawaii-2RG (H2RG) detectors, wheel mechanisms, and the micro-shutter array. We also summarize the accuracy of the two target acquisition procedures used to accurately place science targets into the slit apertures, discuss the current status of the spectro-photometric and wavelength calibration of NIRSpec spectra, and provide the as measured sensitivity in all NIRSpec science modes. Finally, we point out a few important considerations for the preparation of NIRSpec science programs., STFC ERF

Published
2023
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2. Identification and properties of intense star-forming galaxies at redshifts z > 10

Author

Robertson, BE, Tacchella, S, Johnson, BD, Hainline, K, Whitler, L, Eisenstein, DJ, Endsley, R, Rieke, M, Stark, DP, Alberts, S, Dressler, A, Egami, E, Hausen, R, Rieke, G, Shivaei, I, Williams, CC, Willmer, CNA, Arribas, S, Bonaventura, N, Bunker, A, Cameron, AJ, Carniani, S, Charlot, S, Chevallard, J, Curti, M, Curtis-Lake, E, D’Eugenio, F, Jakobsen, P, Looser, TJ, Lützgendorf, N, Maiolino, R, Maseda, MV, Rawle, T, Rix, HW, Smit, R, Übler, H, Willott, C, Witstok, J, Baum, S, Bhatawdekar, R, Boyett, K, Chen, Z, De Graaff, A, Florian, M, Helton, JM, Hviding, RE, Ji, Z, Kumari, N, Lyu, J, Nelson, E, Sandles, L, Saxena, A, Suess, KA, Sun, F, Topping, M, Wallace, IEB, Robertson, BE [0000-0002-4271-0364], Tacchella, S [0000-0002-8224-4505], Johnson, BD [0000-0002-9280-7594], Whitler, L [0000-0003-1432-7744], Eisenstein, DJ [0000-0002-2929-3121], Egami, E [0000-0003-1344-9475], Hausen, R [0000-0002-8543-761X], Williams, CC [0000-0003-2919-7495], Willmer, CNA [0000-0001-9262-9997], Arribas, S [0000-0001-7997-1640], Bunker, A [0000-0002-8651-9879], Cameron, AJ [0000-0002-0450-7306], Carniani, S [0000-0002-6719-380X], Charlot, S [0000-0003-3458-2275], Curti, M [0000-0002-2678-2560], Curtis-Lake, E [0000-0002-9551-0534], D’Eugenio, F [0000-0003-2388-8172], Jakobsen, P [0000-0002-6780-2441], Looser, TJ [0000-0002-3642-2446], Lützgendorf, N [0000-0002-4034-0080], Maseda, MV [0000-0003-0695-4414], Rawle, T [0000-0002-7028-5588], Rix, HW [0000-0003-4996-9069], Smit, R [0000-0001-8034-7802], Übler, H [0000-0003-4891-0794], Willott, C [0000-0002-4201-7367], Witstok, J [0000-0002-7595-121X], Bhatawdekar, R [0000-0003-0883-2226], Boyett, K [0000-0003-4109-304X], Chen, Z [0000-0002-2178-5471], de Graaff, A [0000-0002-2380-9801], Hviding, RE [0000-0002-4684-9005], Kumari, N [0000-0002-5320-2568], Lyu, J [0000-0002-6221-1829], Nelson, E [0000-0002-7524-374X], Sandles, L [0000-0001-9276-7062], Saxena, A [0000-0001-5333-9970], Suess, KA [0000-0002-1714-1905], and Apollo - University of Cambridge Repository

Subjects
5101 Astronomical Sciences, 5109 Space Sciences, 51 Physical Sciences
Abstract

Surveys with the James Webb Space Telescope (JWST) have discovered candidate galaxies in the first 400 Myr of cosmic time. Preliminary indications have suggested these candidate galaxies may be more massive and abundant than previously thought. However, without confirmed distances, their inferred properties remain uncertain. Here we identify four galaxies located in the JWST Advanced Deep Extragalactic Survey Near-Infrared Camera imaging with photometric redshifts z of roughly 10–13. These galaxies include the first redshift z > 12 systems discovered with distances spectroscopically confirmed by JWST in a companion paper. Using stellar population modelling, we find the galaxies typically contain 100 million solar masses in stars, in stellar populations that are less than 100 million years old. The moderate star-formation rates and compact sizes suggest elevated star-formation rate surface densities, a key indicator of their formation pathways. Taken together, these measurements show that the first galaxies contributing to cosmic reionization formed rapidly and with intense internal radiation fields.

Published
2023

3. What drives the scatter of local star-forming galaxies in the BPT diagrams? A Machine Learning based analysis

Author

Mirko Curti, Connor Hayden-Pawson, Roberto Maiolino, Francesco Belfiore, Filippo Mannucci, Alice Concas, Giovanni Cresci, Alessandro Marconi, Michele Cirasuolo, Curti, M [0000-0002-2678-2560], Belfiore, F [0000-0002-2545-5752], Mannucci, F [0000-0002-4803-2381], Concas, A [0000-0003-3203-9818], and Apollo - University of Cambridge Repository

Subjects
Space and Planetary Science, Astrophysics of Galaxies (astro-ph.GA), FOS: Physical sciences, galaxies: abundances, galaxies: fundamental parameters, Astronomy and Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, galaxies: evolution, Astrophysics - Astrophysics of Galaxies, galaxies: ISM, Astrophysics::Galaxy Astrophysics
Abstract

We investigate which physical properties are most predictive of the position of local star forming galaxies on the BPT diagrams, by means of different Machine Learning (ML) algorithms. Exploiting the large statistics from the Sloan Digital Sky Survey (SDSS), we define a framework in which the deviation of star-forming galaxies from their median sequence can be described in terms of the relative variations in a variety of observational parameters. We train artificial neural networks (ANN) and random forest (RF) trees to predict whether galaxies are offset above or below the sequence (via classification), and to estimate the exact magnitude of the offset itself (via regression). We find, with high significance, that parameters primarily associated to variations in the nitrogen-over-oxygen abundance ratio (N/O) are the most predictive for the [N II]-BPT diagram, whereas properties related to star formation (like variations in SFR or EW[H$\alpha$]) perform better in the [S II]-BPT diagram. We interpret the former as a reflection of the N/O-O/H relationship for local galaxies, while the latter as primarily tracing the variation in the effective size of the S$^{+}$ emitting region, which directly impacts the [S II]emission lines. This analysis paves the way to assess to what extent the physics shaping local BPT diagrams is also responsible for the offsets seen in high redshift galaxies or, instead, whether a different framework or even different mechanisms need to be invoked., Comment: Accepted for publication on MNRAS (31 pages, 20 figures)

Published
2022

4. Spectroscopic confirmation of four metal-poor galaxies at z=10.3-13.2

Author

Emma Curtis-Lake, Stefano Carniani, Alex Cameron, Stephane Charlot, Peter Jakobsen, Roberto Maiolino, Andrew Bunker, Joris Witstok, Renske Smit, Jacopo Chevallard, Chris Willott, Pierre Ferruit, Santiago Arribas, Nina Bonaventura, Mirko Curti, Francesco D’Eugenio, Marijn Franx, Giovanna Giardino, Tobias J. Looser, Nora Lützgendorf, Michael V. Maseda, Tim Rawle, Hans-Walter Rix, Bruno Rodríguez del Pino, Hannah Übler, Marco Sirianni, Alan Dressler, Eiichi Egami, Daniel J. Eisenstein, Ryan Endsley, Kevin Hainline, Ryan Hausen, Benjamin D. Johnson, Marcia Rieke, Brant Robertson, Irene Shivaei, Daniel P. Stark, Sandro Tacchella, Christina C. Williams, Christopher N. A. Willmer, Rachana Bhatawdekar, Rebecca Bowler, Kristan Boyett, Zuyi Chen, Anna de Graaff, Jakob M. Helton, Raphael E. Hviding, Gareth C. Jones, Nimisha Kumari, Jianwei Lyu, Erica Nelson, Michele Perna, Lester Sandles, Aayush Saxena, Katherine A. Suess, Fengwu Sun, Michael W. Topping, Imaan E. B. Wallace, Lily Whitler, Curtis-Lake, E [0000-0002-9551-0534], Carniani, S [0000-0002-6719-380X], Cameron, A [0000-0002-0450-7306], Charlot, S [0000-0003-3458-2275], Jakobsen, P [0000-0002-6780-2441], Bunker, A [0000-0002-8651-9879], Witstok, J [0000-0002-7595-121X], Smit, R [0000-0001-8034-7802], Willott, C [0000-0002-4201-7367], Ferruit, P [0000-0001-8895-0606], Arribas, S [0000-0001-7997-1640], Curti, M [0000-0002-2678-2560], D’Eugenio, F [0000-0003-2388-8172], Looser, TJ [0000-0002-3642-2446], Lützgendorf, N [0000-0002-4034-0080], Maseda, MV [0000-0003-0695-4414], Rawle, T [0000-0002-7028-5588], Rix, HW [0000-0003-4996-9069], Übler, H [0000-0003-4891-0794], Sirianni, M [0000-0002-7626-6361], Egami, E [0000-0003-1344-9475], Eisenstein, DJ [0000-0002-2929-3121], Hausen, R [0000-0002-8543-761X], Johnson, BD [0000-0002-9280-7594], Robertson, B [0000-0002-4271-0364], Williams, CC [0000-0003-2919-7495], Willmer, CNA [0000-0001-9262-9997], Bhatawdekar, R [0000-0003-0883-2226], Bowler, R [0000-0003-3917-1678], Boyett, K [0000-0003-4109-304X], Chen, Z [0000-0002-2178-5471], de Graaff, A [0000-0002-2380-9801], Hviding, RE [0000-0002-4684-9005], Jones, GC [0000-0002-0267-9024], Kumari, N [0000-0002-5320-2568], Lyu, J [0000-0002-6221-1829], Nelson, E [0000-0002-7524-374X], Perna, M [0000-0002-0362-5941], Sandles, L [0000-0001-9276-7062], Saxena, A [0000-0001-5333-9970], Suess, KA [0000-0002-1714-1905], Whitler, L [0000-0003-1432-7744], Apollo - University of Cambridge Repository, Curtis-Lake, E., Carniani, Stefano, Cameron, Alex, Charlot, S., Jakobsen, P., Maiolino, Roberto, Bunker, A., Witstok, J., Smit, R., Chevallard, J., Willott, C., Ferruit, P., Arribas, S., Bonaventura, N., Curti, Mirko, D'Eugenio, F., Franx, M., Giardino, G., Looser, T. J., Lutzgendorf, N., Maseda, M. V., Rawle, T., Rix, H. -W., Rodriguez del Pino, B., Ubler, H., Sirianni, M., Dressler, A., Egami, E., Eisenstein, D. J., Endsley, R., Hainline, K., Hausen, R., Johnson, B. D., Rieke, M., Robertson, B., Shivaei, I., Stark, D. P., Tacchella, S., Williams, C. C., Willmer, C. N. A., Bhatawdekar, R., Bowler, Rebecca, Boyett, K., Chen, Z., de Graaff, A., Helton, J. M., Hviding, R. E., Jones, G. C., Kumari, N., Lyu, J., Nelson, E., Perna, Michele, Sandles, L., Saxena, A., Suess, K. A., Sun, F., Topping, M. W., Wallace, I. E. B., and Whitler, L.

Subjects
Settore FIS/05 - Astronomia e Astrofisica, 5101 Astronomical Sciences, Astrophysics of Galaxies (astro-ph.GA), FOS: Physical sciences, Astronomy and Astrophysics, 51 Physical Sciences, Astrophysics - Astrophysics of Galaxies
Abstract

Finding and characterising the first galaxies that illuminated the early Universe at cosmic dawn is pivotal to understand the physical conditions and the processes that led to the formation of the first stars. In the first few months of operations, imaging from the James Webb Space Telescope (JWST) have been used to identify tens of candidates of galaxies at redshift (z) greater than 10, less than 450 million years after the Big Bang. However, none of these candidates has yet been confirmed spectroscopically, leaving open the possibility that they are actually low-redshift interlopers. Here we present spectroscopic confirmation and analysis of four galaxies unambiguously detected at redshift 10.3, Comment: 32 pages, 8 figures, accepted to Nature Astronomy

Published
2022

5. In-orbit Performance of the Near-infrared Spectrograph NIRSpec on the James Webb Space Telescope

Author

T. Böker, T. L. Beck, S. M. Birkmann, G. Giardino, C. Keyes, N. Kumari, J. Muzerolle, T. Rawle, P. Zeidler, Y. Abul-Huda, C. Alves de Oliveira, S. Arribas, K. Bechtold, R. Bhatawdekar, N. Bonaventura, A. J. Bunker, A. J. Cameron, S. Carniani, S. Charlot, M. Curti, N. Espinoza, P. Ferruit, M. Franx, P. Jakobsen, D. Karakla, M. López-Caniego, N. Lützgendorf, R. Maiolino, E. Manjavacas, A. P. Marston, S. H. Moseley, P. Ogle, M. Perna, M. Peña-Guerrero, N. Pirzkal, R. Plesha, C. R. Proffitt, B. J. Rauscher, H.-W. Rix, B. Rodríguez del Pino, Z. Rustamkulov, E. Sabbi, D. K. Sing, M. Sirianni, M. te Plate, L. Úbeda, G. M. Wahlgren, E. Wislowski, R. Wu, Chris J. Willott, Böker, T., Beck, T. L., Birkmann, S. M., Giardino, G., Keyes, C., Kumari, N., Muzerolle, J., Rawle, T., Zeidler, P., Abul-Huda, Y., de Oliveira, C. A., Arribas, S., Bechtold, K., Bhatawdekar, R., Bonaventura, N., Bunker, A. J., Cameron, A. J., Carniani, S., Charlot, S., Curti, M., Espinoza, N., Ferruit, P., Franx, M., Jakobsen, P., Karakla, D., López-Caniego, M., Lützgendorf, N., Maiolino, R., Manjavacas, E., Marston, A. P., Moseley, S. H., Ogle, P., Perna, M., Peña-Guerrero, M., Pirzkal, N., Plesha, R., Proffitt, C. R., Rauscher, B. J., Rix, H. W., del Pino, B. R., Rustamkulov, Z., Sabbi, E., Sing, D. K., Sirianni, M., Plate, M. t., Úbeda, L., Wahlgren, G. M., Wislowski, E., Wu, R., Willott, C. J., Böker, T [0000-0002-5666-7782], Beck, TL [0000-0002-6881-0574], Birkmann, SM [0000-0001-7058-1726], Giardino, G [0000-0002-9262-7155], Keyes, C [0000-0002-4834-369X], Kumari, N [0000-0002-5320-2568], Rawle, T [0000-0002-7028-5588], Zeidler, P [0000-0002-6091-7924], de Oliveira, CA [0000-0003-2896-4138], Arribas, S [0000-0001-7997-1640], Bechtold, K [0000-0002-7722-6900], Bhatawdekar, R [0000-0003-0883-2226], Bonaventura, N [0000-0001-8470-7094], Cameron, AJ [0000-0002-0450-7306], Carniani, S [0000-0002-6719-380X], Charlot, S [0000-0003-3458-2275], Curti, M [0000-0002-2678-2560], Espinoza, N [0000-0001-9513-1449], Ferruit, P [0000-0001-8895-0606], Jakobsen, P [0000-0002-6780-2441], López-Caniego, M [0000-0003-1016-9283], Lützgendorf, N [0000-0002-4034-0080], Maiolino, R [0000-0002-4985-3819], Manjavacas, E [0000-0003-0192-6887], Marston, AP [0000-0001-5788-5258], Ogle, P [0000-0002-3471-981X], Perna, M [0000-0002-0362-5941], Peña-Guerrero, M [0000-0003-2314-3453], Plesha, R [0000-0002-2509-3878], Proffitt, CR [0000-0001-7617-5665], Rauscher, BJ [0000-0003-2662-6821], del Pino, BR [0000-0001-5171-3930], Sabbi, E [0000-0003-2954-7643], Sing, DK [0000-0001-6050-7645], Sirianni, M [0000-0002-7626-6361], Úbeda, L [0000-0001-7130-2880], Wahlgren, GM [0000-0002-6570-4776], Willott, CJ [0000-0002-4201-7367], and Apollo - University of Cambridge Repository

Subjects
Spectrometers (1554), Settore FIS/05 - Astronomia e Astrofisica, Space and Planetary Science, DETECTORS, FOS: Physical sciences, Spectroscopy (1558), Space telescopes (1547), Astronomy and Astrophysics, 5109 Space Sciences, Space vehicle instruments (1548) [Unified Astronomy Thesaurus concepts], Astrophysics - Instrumentation and Methods for Astrophysics, Instrumentation and Methods for Astrophysics (astro-ph.IM), 51 Physical Sciences
Abstract

The Near-Infrared Spectrograph (NIRSpec) is one of the four focal plane instruments on the James Webb Space Telescope. In this paper, we summarize the in-orbit performance of NIRSpec, as derived from data collected during its commissioning campaign and the first few months of nominal science operations. More specifically, we discuss the performance of some critical hardware components such as the two NIRSpec Hawaii-2RG (H2RG) detectors, wheel mechanisms, and the micro-shutter array. We also summarize the accuracy of the two target acquisition procedures used to accurately place science targets into the slit apertures, discuss the current status of the spectro-photometric and wavelength calibration of NIRSpec spectra, and provide the as measured sensitivity in all NIRSpec science modes. Finally, we point out a few important considerations for the preparation of NIRSpec science programs., accepted by PASP for special issue on JWST in-orbit performance

Published
2023

6. Assessing the sources of reionization: A spectroscopic case study of a 30× lensed galaxy at z ∼5 with Lyα, C iv, Mg ii, and [Ne iii]

Author

Witstok, J, Smit, R, Maiolino, R, Curti, M, Laporte, N, Massey, R, Richard, J, Swinbank, M, Witstok, J [0000-0002-7595-121X], Smit, R [0000-0001-8034-7802], Maiolino, R [0000-0002-4985-3819], Curti, M [0000-0002-2678-2560], Laporte, N [0000-0001-7459-6335], Massey, R [0000-0002-6085-3780], Richard, J [0000-0001-5492-1049], Swinbank, M [0000-0003-1192-5837], and Apollo - University of Cambridge Repository

Subjects
galaxies: high-redshift, gravitational lensing: strong, dark ages, reionization, first stars, Astrophysics::Cosmology and Extragalactic Astrophysics, methods: observational, Astrophysics::Galaxy Astrophysics, techniques: spectroscopic
Abstract

We present a detailed spectroscopic analysis of a galaxy at $z \simeq 4.88$ that is, by chance, magnified $\sim 30 \times$ by gravitational lensing. Only three sources at $z \gtrsim 5$ are known with such high magnification. This particular source has been shown to exhibit widespread, high equivalent width CIV $\lambda$ 1549 {\AA} emission, implying it is a unique example of a metal-poor galaxy with a hard radiation field, likely representing the galaxy population responsible for cosmic reionisation. Using UV nebular line ratio diagnostics, VLT/X-shooter observations rule out strong AGN activity, indicating a stellar origin of the hard radiation field instead. We present a new detection of [NeIII] $\lambda$ 3870 {\AA} and use the [NeIII]/[OII] line ratio to constrain the ionisation parameter and gas-phase metallicity. Closely related to the commonly used [OIII]/[OII] ratio, our [NeIII]/[OII] measurement shows this source is similar to local "Green Pea" galaxies and Lyman-continuum leakers. It furthermore suggests this galaxy is more metal poor than expected from the Fundamental Metallicity Relation, possibly as a consequence of excess gas accretion diluting the metallicity. Finally, we present the highest redshift detection of MgII $\lambda$ 2796 {\AA}, observed at high equivalent width in emission, in contrast to more evolved systems predominantly exhibiting MgII absorption. Strong MgII emission has been observed in most $z \sim 0$ Lyman-continuum leakers known and has recently been proposed as an indirect tracer of escaping ionising radiation. In conclusion, this strongly lensed galaxy, observed just 300 Myr after reionisation ends, enables testing of observational diagnostics proposed to constrain the physical properties of distant galaxies in the $\mathit{JWST}$/ELT era.

Published
2021
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