Welcome to my minimal webpage !

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  <font size=4> &nbsp; &nbsp;
   My name is Johan Comparat, I am a researcher at MPE.
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   <br>
 
   My scientific interest is multi-wavelength cosmology with the large-scale structure of the Universe
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   <img src="cv/portrait_25.png" height="200">
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About me

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<ul>
	<li>
	<a href="cv/comparat_cv_english.pdf">Curriculum vitae</a>
	</li>
	
	<li>
	Publication lists from
	<a href="https://ui.adsabs.harvard.edu/search/q=author%3A%22Comparat%2C%20Johan%22&sort=date%20desc%2C%20bibcode%20desc">NASA/ADS</a>
	and compiled by myself <a href="cv/liste_publications_EN.pdf">in pdf</a>
	</li>


</ul>

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<br>
My articles from 2025:
<br>
<ul>
	<li>
	<a href="https://ui.adsabs.harvard.edu/abs/2025arXiv250410241C/abstract">
		Cross-correlations between X-ray clusters and the general galaxy population</a> 
	(<a href="https://seminars.lam.fr/cafe-club/GECO_cafe_club_2025_07_08_COMPARAT/">
		recorded presentation</a> at the cafe club at LAM )
        ( <a href="https://zenodo.org/records/15806800">data on zenodo</a> ). Authors: Comparat J., Macias-Perez, J. ; Combet, C. et al. 2025

	</li>
	<li>
	<a href="https://ui.adsabs.harvard.edu/#abs/2025A%26A...697A.173C/abstract">
Cross-correlation between soft X-rays and galaxies: A new benchmark for galaxy evolution models
	</a> 
	( <a href="https://zenodo.org/records/15111974">data on zenodo</a> ). Authors: Comparat J., Merloni A., Ponti G. et al. 2025
	</li>
</ul>

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eROSITA cosmology results (2024)
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<ul>

        <li>
		<a href="https://ui.adsabs.harvard.edu/abs/2024A%26A...689A.298G/abstract">The SRG/eROSITA all-sky survey: Cosmology constraints from cluster abundances in the western Galactic hemisphere
		</a>
	</li>
	<li>
		<a href="https://ui.adsabs.harvard.edu/abs/2025A%26A...696A...5A/abstract">The SRG/eROSITA All-Sky Survey: Constraints on the structure growth from cluster number counts
		</a>
	</li>
	<li>
		<a href="https://ui.adsabs.harvard.edu/abs/2024A%26A...686A.196S/abstract">The SRG/eROSITA All-Sky Survey. Tracing the large-scale structure with a clustering study of galaxy clusters
		</a>
	</li>
	<li>
		<a href="https://ui.adsabs.harvard.edu/abs/2024A%26A...691A.301A/abstract">The SRG/eROSITA All-Sky Survey: Constraints on f (R) gravity from cluster abundances
		</a>
	</li>
</ul>

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eBOSS cosmology results (2021)
<br>
<ul>

        <li>
                <a href="https://ui.adsabs.harvard.edu/#abs/2021PhRvD.103h3533A/abstract">Completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey: Cosmological implications from two decades of spectroscopic surveys at the Apache Point Observatory
                </a>
        </li>

        <li>
                <a href="https://ui.adsabs.harvard.edu/#abs/2021MNRAS.501.5616D/abstract">The completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey: measurement of the BAO and growth rate of structure of the emission line galaxy sample from the anisotropic power spectrum between redshift 0.6 and 1.1
                </a>
        </li>

        <li>
                <a href="https://ui.adsabs.harvard.edu/abs/2021MNRAS.500.3254R/abstract">The completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey: large-scale structure catalogues and measurement of the isotropic BAO between redshift 0.6 and 1.1 for the Emission Line Galaxy Sample
                </a>
        </li>
	
        <li>
                <a href="https://ui.adsabs.harvard.edu/abs/2020MNRAS.499.5527T/abstract">The completed SDSS-IV extended baryon oscillation spectroscopic survey: growth rate of structure measurement from anisotropic clustering analysis in configuration space between redshift 0.6 and 1.1 for the emission-line galaxy sample
                </a>
        </li>
</ul>



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X-ray simulated universes
<br>
<ul>
	<li>
        <a href="https://ui.adsabs.harvard.edu/abs/2024A%26A...687A.238C/abstract">
		The SRG/eROSITA All-Sky Survey. X-ray selection function models for the eRASS1 galaxy cluster cosmology</a> Clerc, Comparat et al. 2024.
	<li>
        <a href="https://ui.adsabs.harvard.edu/abs/2022A%26A...665A..78S/abstract">Detecting clusters of galaxies and active galactic nuclei in an eROSITA all-sky survey digital twin.</a>  Seppi, Comparat et al. 2022. 
        </li>
        <li>
        <a href="https://ui.adsabs.harvard.edu/abs/2022A%26A...661A..27L/abstract">Establishing the X-ray source detection strategy for eROSITA with simulations.</a>  Liu, Merloni, Comparat et al. 2022.
        </li>

	<li> Methods to simulate AGN and clusters in the X-ray
	</li>

	<ul>
	<li> Simulated events. 
	<a href="http://www2011.mpe.mpg.de/~comparat/eROSITA_mock">Simulated eROSITA light cones and photon lists (clusters and AGN)</a>
	</li>
	<li>AGN method. 
        <a href="https://ui.adsabs.harvard.edu/abs/2019MNRAS.487.2005C/abstract">Active galactic nuclei and their large-scale structure: an eROSITA mock catalogue. Comparat, Merloni, Salvato et al. 2019.</a> 
        </li>

        <li>Cluster method. 
        <a href="https://ui.adsabs.harvard.edu/abs/2020OJAp....3E..13C/abstract">Full-sky photon simulation of clusters and active galactic nuclei in the soft X-rays for eROSITA. Comparat, Eckert, Finoguenov et al. 2020.</a>
        </li>
	</ul>

	<li>
	Skies and Universes:
<a href="http://skiesanduniverses.org">(IAA, Spain)</a>,
	</li>

</ul>

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<a href="https://ui.adsabs.harvard.edu/abs/2017arXiv171106575C/abstract">Stellar population properties for 2 million galaxies from SDSS DR14 and DEEP2 DR4 from full spectral fitting.</a>  Comparat, Maraston et al. 2017

<ul>
	<li>
		<a href="https://firefly.mpe.mpg.de/v1_1_0/DEEP2/">DEEP2</a>
	</li>
	<li>
		<a href="https://firefly.mpe.mpg.de/v1_1_0/">SDSS and eBOSS</a>
	</li>
	<li>
		<a href="https://github.com/FireflySpectra/">Code repository</a>
	</li>
	<li>
		<a href="firefly_doc">Documentation</a>
	</li>
</ul>
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Emission line galaxy catalogues and luminosity functions (Articles from 2013-2016)

<ul>
<li>
Articles :
</li>

	<ul>
	<li>
	<a href="https://ui.adsabs.harvard.edu/abs/2015A%26A...575A..40C/abstract">The 0.1 z 1.65 evolution of the bright end of the [O ii] luminosity function.</a> Comparat, Richard, Kneib et al. 2015
	</li>

        <li>
        <a href="https://ui.adsabs.harvard.edu/abs/2016MNRAS.461.1076C/abstract">The evolution of the [O II], H β and [O III] emission line luminosity functions over the last nine billions years.</a> Comparat et, Zhu, Gonzalez-Perez al. 2016
        </li>

	</ul>


<li>
Data and code :
</li>
	
	<ul>
        <li>
		<a href="https://firefly.mpe.mpg.de/emission_line_data/LF_OII_Comparat2015/">[Oii] luminosity functions (2015 article)</a>
        </li>
        <li>
                <a href="https://firefly.mpe.mpg.de/emission_line_data/LF_OII_Hbeta_OIII_Comparat2016/">[Oii], H beta, [Oiii] luminosity functions (2016 article)</a>
        </li>
	<li>
                <a href="https://firefly.mpe.mpg.de/emission_line_data/DEEP2/">DEEP2 data (2016 article)</a>
        </li>
        <li>
                <a href="https://firefly.mpe.mpg.de/emission_line_data/VVDS/">VVDS data (2016 article)</a>
        </li>
        <li>
		<a href="https://firefly.mpe.mpg.de/emission_line_data/VIPERS">VIPERS data (2016 article)</a>
        </li>
        <li>
		<a href="https://github.com/JohanComparat/pySU">Code</a>
        </li>
	</ul>
</ul>
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Stacking of optical spectra to create templates (e.g. for 4MOST)
        <ul>
        <li>
        <a href="https://github.com/JohanComparat/qmost_templates/">Stacked spectra repository</a>
	</li>
        </ul>

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Links:
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Github (Code)
<ul>
	<li> <a href="https://github.com/JohanComparat">my github repository</a> </li>
	<li> <a href="https://gitlab.mpcdf.mpg.de/joco">my gitlab repository</a> </li>
</ul>
 
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PhD students 
<ul>
<li> S. Shreeram, 2023-, MPE Garching, Germany </li>
<li> Y. Zhang, 2021-, MPE                      </li>
<li> R. Seppi, 2019-2023, MPE                  </li>
<li> J. Ider Chitham, 2017-2021                </li>
<li> F. Albareti, 2015-2018, UAM, Madrid, Spain  </li>
<li> S. Rodriguez-Torres, 2014-2017, UAM         </li>
<li> G. Favole, 2012-2016, UAM                   </li>
</ul>


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Last update Jan. 2024