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Dear Colleagues, </div>
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A kind reminder that <b>the sixth call for joint Australia-eROSITA_DE projects will be open until Monday 19 June 2026.</b> This call follows five previous successful calls for joint projects under the agreement between Australian-based astronomers, represented
by Astronomy Australia Limited (AAL) and the German eROSITA Consortium (eROSITA_DE).</div>
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At the end of 2021, the eROSITA (extended Roentgen Survey with an Imaging Telescope Array) instrument completed its fourth survey of the full sky at X-ray wavelengths. In January 2024, the data from the first full sky survey (eRASS1) was made public. Australian
astronomers have access to still proprietary data from subsequent surveys through the Australia/eROSITA-DE collaboration. The next data release, eRASS:3 will be released mid-year 2026.</div>
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Although the eROSITA instrument is currently in safe mode, the existing eROSITA data already surpass those coming from previous all-sky X-ray surveys, having much greater depth, image quality, and spectral coverage. The eROSITA data offer the opportunity to
study extremely energetic events across vast scales in the Universe, from accreting binary systems at stellar scales to 10-million-degree shocks driven by galaxy cluster mergers.</div>
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Australia/eROSITA_DE projects will:</div>
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Require the use of products associated with both the eROSITA_DE survey and Australian surveys/facilities.</li><li style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0); line-height: 18.4px; margin: 0cm 0cm 8pt;">
Involve at least one member from each of the eROSITA_DE survey and an Australian Institution.</li><li style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0); line-height: 18.4px; margin: 0cm 0cm 8pt;">
Not be in conflict with <a href="https://url.au.m.mimecastprotect.com/s/xRCKCZY1NqiDqX0XZUzfwcB21Hx?domain=astronomyaustralia.org.au/" target="_blank" id="OWAb0e3b73e-4d5d-9789-8d99-3b1c8a434232" class="x_OWAAutoLink" title="https://astronomyaustralia.org.au/erosita_de-australian-collaborative-proposals-astronomy-australia-ltd/" rel="noopener noreferrer" data-auth="NotApplicable" data-linkindex="0" style="color: rgb(0, 0, 0); margin: 0px;">
<u>existing Australia/eROSITA_DE science projects</u></a>.</li><li style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0); line-height: 18.4px; margin: 0cm 0cm 8pt;">
Adhere to the existing policies for the individual facilities involved (e.g. proprietary periods, data access, survey teams, observing time, publications).</li><li style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0); line-height: 18.4px; margin: 0cm 0cm 8pt;">
(Optionally) Allow participation by undergraduate and postgraduate students.</li></ul>
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Proposers are required to seek approval by the relevant eROSITA_DE Science Working Group before submission and should thus form their team with the corresponding partners early on. The AAL eROSITA Collaboration
<a href="https://url.au.m.mimecastprotect.com/s/nPGnC1WLPxckALlLyIGhKcVEVTD?domain=astronomyaustralia.org.au/" target="_blank" id="OWAd42ffd40-bd9e-01ce-7dd6-493617a21e1a" class="x_OWAAutoLink" title="https://astronomyaustralia.org.au/erosita-collaboration-astronomy-australia-ltd/" rel="noopener noreferrer" data-auth="NotApplicable" data-linkindex="1" style="color: rgb(0, 0, 0); margin: 0px;">
<u>webpage</u></a> includes a list of eROSITA_DE contacts including Chairs of Science Working Groups. If you are interested in using eROSITA and Australian facilities for your research, but do not know who to contact specifically, please reach out to Australian
Science Lead, Nicholas Tothill, at N.Tothill@westernsydney.edu.au</div>
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A list of participating <a href="https://url.au.m.mimecastprotect.com/s/r0y4C2xMQziR20g0qFBiJc5_DnK?domain=astronomyaustralia.org.au/" target="_blank" id="OWAca9010a1-8c92-968f-46b0-290f530a8809" class="x_OWAAutoLink" title="https://astronomyaustralia.org.au/australian-facilities-surveys/" rel="noopener noreferrer" data-auth="NotApplicable" data-linkindex="2" style="color: rgb(0, 0, 0); margin: 0px;">
<u>Australian facilities</u></a>, <a href="https://url.au.m.mimecastprotect.com/s/nqcRC3QNPBiGgWOW1IDsRcQh2qy?domain=astronomyaustralia.org.au/" target="_blank" id="OWA0de6ef7b-980a-39c8-430b-49e3d3c37a85" class="x_OWAAutoLink" title="https://astronomyaustralia.org.au/participating-australian-astronomical-surveys/" rel="noopener noreferrer" data-auth="NotApplicable" data-linkindex="3" style="color: rgb(0, 0, 0); margin: 0px;">
<u>Australian surveys</u></a>, and <a href="https://url.au.m.mimecastprotect.com/s/xRCKCZY1NqiDqX0XZUzfwcB21Hx?domain=astronomyaustralia.org.au/" target="_blank" id="OWA291ec489-3ea9-dc13-f9ed-419755fb3fd6" class="x_OWAAutoLink" title="https://astronomyaustralia.org.au/erosita_de-australian-collaborative-proposals-astronomy-australia-ltd/" rel="noopener noreferrer" data-auth="NotApplicable" data-linkindex="4" style="color: rgb(0, 0, 0); margin: 0px;">
<u>existing projects</u></a> is provided on the <a href="https://url.au.m.mimecastprotect.com/s/6KWRC4QOPEim2RqRNTVtjc4KWjn?domain=astronomyaustralia.org.au/" target="_blank" id="OWAfced0e53-8ff2-c4fb-fe63-2ba113f394cd" class="x_OWAAutoLink" title="https://astronomyaustralia.org.au/erosita-astronomy-australia-ltd/" rel="noopener noreferrer" data-auth="NotApplicable" data-linkindex="5" style="color: rgb(0, 0, 0); margin: 0px;">
<u>AAL eROSITA webpage</u></a> this page where you can also find out more information about the project. Further information is also available on the
<a href="https://url.au.m.mimecastprotect.com/s/ZkxtC5QPXJixPw2wmt8u5ckKaMN?domain=mpe.mpg.de" target="_blank" id="OWA18e08e0e-aa20-51b3-1e6d-77bb5fc3ebf2" class="x_OWAAutoLink" title="https://www.mpe.mpg.de/eROSITA" rel="noopener noreferrer" data-auth="NotApplicable" data-linkindex="6" style="color: rgb(0, 0, 0); margin: 0px;">
<u>eROSITA MPE webpage</u></a>.</div>
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<b>How to apply</b></div>
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<span style="color: rgb(0, 0, 0);">The proposal process is described on the </span>
<span style="color: black;"><a href="https://url.au.m.mimecastprotect.com/s/OUzsC6XQ4Lf16ZqZ2cBC3c5kTWW?domain=astronomyaustralia.org.au/" target="_blank" id="OWA0fdf8eb9-ce78-8f83-2372-c7f9224011dd" class="x_OWAAutoLink" title="https://astronomyaustralia.org.au/australia-erosita-projects-astronomy-australia-ltd/" rel="noopener noreferrer" data-auth="NotApplicable" data-linkindex="7" style="color: black; margin: 0px;"><u>AAL eROSITA Project
Application page</u></a></span><span style="color: rgb(0, 0, 0);"> and proposals should be submitted via
<a href="https://url.au.m.mimecastprotect.com/s/Ty2mC71R2NTQXnwn5F2F5co-HMj?domain=forms.gle" target="_blank" id="OWAf48634b1-b233-f738-1b15-66d4755a692c" class="x_OWAAutoLink" title="https://forms.gle/grvK6YNWySAz3TCE9" rel="noopener noreferrer" data-auth="NotApplicable" data-linkindex="8" style="color: rgb(0, 0, 0); margin: 0px;">
<u>this Google form</u></a>.</span></div>
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<b>Questions</b></div>
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If you have any questions on this proposal opportunity, please do not hesitate to contact the Australian Science Lead, Nicholas Tothill (N.Tothill@westernsydney.edu.au) or AAL/eROSITA-DE Committee secretary, Grace Lawrence (grace.lawrence@astronomyaustralia.org.au).</div>
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Kind regards,</div>
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Grace </div>
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(On behalf of the AAL/eROSITA-DE Management Committee)</div>
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<b>Dr Grace Lawrence</b></div>
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Program Manager </div>
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Astronomy Australia Limited</div>
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