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has-post-thumbnail hentry category-hawc category-wipac"> <div class="article-inner "> <header class="entry-header"> <div class="entry-header-text entry-header-text-top text-left"> <h6 class="entry-category is-xsmall"> <a href="https://wipac.wisc.edu/category/projects/hawc/" rel="category tag">HAWC</a>, <a href="https://wipac.wisc.edu/category/projects/wipac/" rel="category tag">WIPAC</a></h6> <h1 class="entry-title">HAWC detection of an ultra-high-energy gamma-ray bubble around a microquasar</h1> <div class="entry-divider is-divider small"></div> <div class="entry-meta uppercase is-xsmall"> <span class="posted-on">Posted on <a href="https://wipac.wisc.edu/hawc-detection-of-an-ultra-high-energy-gamma-ray-bubble-around-a-microquasar/" rel="bookmark"><time class="entry-date published" datetime="2024-10-17T15:50:20-05:00">October 17, 2024</time><time class="updated" datetime="2024-10-18T07:49:22-05:00">October 18, 2024</time></a></span><span class="byline"> by <span class="meta-author vcard"><a class="url fn n" href="https://wipac.wisc.edu/author/staff/">Staff</a></span></span> </div> </div> </header> <div class="entry-content single-page"> <p><em>This story is adapted from the HAWC Collaboration <a href="https://www.hawc-observatory.org/news/index.php?fbclid=IwZXh0bgNhZW0CMTEAAR0Wv37IiFdj-3RShReXWO98KqufPzJAASE8gN8bQHh3Rggs7OvWN7s5vkE_aem_mi8bd1fu8rSrIIubzGhzOA#hawc_nature" target="_blank" rel="noreferrer noopener">press release</a>.</em></p> <figure class="wp-block-image size-large"><img fetchpriority="high" decoding="async" width="778" height="800" src="https://wipac.wisc.edu/wp-content/uploads/2024/10/microquasar_HAWC-1-778x800.jpeg" alt="Schematic illustration of the V4641Sgr region. Credit: HAWC Colalboration" class="wp-image-17385" srcset="https://wipac.wisc.edu/wp-content/uploads/2024/10/microquasar_HAWC-1-778x800.jpeg 778w, https://wipac.wisc.edu/wp-content/uploads/2024/10/microquasar_HAWC-1-389x400.jpeg 389w, https://wipac.wisc.edu/wp-content/uploads/2024/10/microquasar_HAWC-1-768x789.jpeg 768w, https://wipac.wisc.edu/wp-content/uploads/2024/10/microquasar_HAWC-1-1494x1536.jpeg 1494w, https://wipac.wisc.edu/wp-content/uploads/2024/10/microquasar_HAWC-1.jpeg 1539w" sizes="(max-width: 778px) 100vw, 778px" /><figcaption class="wp-element-caption">Schematic illustration of the V4641Sgr region. Credit: HAWC Collaboration</figcaption></figure> <p>Microquasars鈥攃ompact regions surrounding a black hole with a mass several times that of its companion star鈥攈ave long been recognized as powerful particle accelerators within our galaxy. The enormous jets spewing out of microquasars are thought to play an important role in the production of galactic cosmic rays, although their contribution to the galactic cosmic-ray flux is still unknown.</p> <p>In a new paper in the journal <em><a href="https://www.nature.com/articles/s41586-024-07995-9" target="_blank" rel="noreferrer noopener">Nature</a></em>, the High-Altitude Water Cherenkov Gamma-ray Observatory (<a href="https://wipac.wisc.edu/science/projects/hawc/">HAWC</a>) Collaboration reports the first detection of ultra-high-energy gamma rays from the microquasar V4641鈥塖agittarii (V4641鈥塖gr), with photon energies exceeding 200 teraelectronvolts (TeV).</p> <div class="wp-block-image"> <figure class="alignleft size-full"><img decoding="async" width="200" height="224" src="https://wipac.wisc.edu/wp-content/uploads/2021/09/58_Ke-Fang2_c.jpeg" alt="A picture of Ke Fang, assistant professor in the Department of Physics at the University of Wisconsin鈥揗adison." class="wp-image-211"/><figcaption class="wp-element-caption">Ke Fang</figcaption></figure></div> <p>“The HAWC observation established this microquasar, V4641Sgr, as the second galactic source with a set of large-scale jets,” says Ke Fang, an assistant professor of physics at the Wisconsin IceCube Particle Astrophysics Center (WIPAC) at the University of Wisconsin鈥揗adison and US spokesperson for HAWC. “It suggests that mini black holes in our galaxy may power jets as large as a hundred parsec.”</p> <p>Located near Puebla, Mexico, at an altitude of 13,500 feet, HAWC observes gamma rays and cosmic rays between 100 gigaelectronvolts (GeV) and a few hundred TeV. HAWC uses a network of 300 large water tanks, each filled with about 200 metric tons of water, that are nestled between two dormant volcano peaks. </p> <p>HAWC detected an excess of gamma-ray emission coincident with the location of the microquasar V4641鈥塖gr in the Sagittarius constellation. The study revealed that microquasars like V4641Sgr could significantly contribute to the galactic cosmic ray spectrum up to petaelectronvolt energies. This discovery also suggests that large-scale jets from microquasars may be more common than previously believed, reinforcing their role as smaller analogs of active galactic nuclei.</p> <p>The origin of the detected gamma rays may stem from proton interactions with ambient gas or from electrons up-scattering photons, although the leptonic scenario is challenged by their rapid energy loss at high energies. Additionally, the study shows the continuous advantages of wide-field observatories like HAWC in detecting large-scale gamma-ray emissions, providing new insights into particle acceleration in extreme environments.</p> <p>************</p> <p>Currently, the international <a href="https://www.hawc-observatory.org/collaboration/" target="_blank" rel="noreferrer noopener">HAWC Collaboration</a> consists of more than 30 institutions in the US, Mexico, Europe, Asia, and South America. The UW鈥揗adison HAWC group at WIPAC, now led by Fang, has been involved with the HAWC experiment from the beginning of the design stage, through its construction, and into the data analysis phase. As part of her research, Fang uses data from HAWC to observe or find gamma-ray sources.  </p> <div class="blog-share text-center"><div class="is-divider medium"></div><div class="social-icons share-icons share-row relative" ><a href="whatsapp://send?text=HAWC%20detection%20of%20an%20ultra-high-energy%20gamma-ray%20bubble%20around%20a%20microquasar - https://wipac.wisc.edu/hawc-detection-of-an-ultra-high-energy-gamma-ray-bubble-around-a-microquasar/" data-action="share/whatsapp/share" class="icon button circle is-outline tooltip whatsapp show-for-medium" title="Share on WhatsApp" aria-label="Share on WhatsApp"><i class="icon-whatsapp"></i></a><a href="https://www.facebook.com/sharer.php?u=https://wipac.wisc.edu/hawc-detection-of-an-ultra-high-energy-gamma-ray-bubble-around-a-microquasar/" data-label="Facebook" onclick="window.open(this.href,this.title,'width=500,height=500,top=300px,left=300px'); return false;" rel="noopener noreferrer nofollow" target="_blank" class="icon button circle is-outline tooltip facebook" title="Share on Facebook" aria-label="Share on Facebook"><i class="icon-facebook" ></i></a><a href="https://twitter.com/share?url=https://wipac.wisc.edu/hawc-detection-of-an-ultra-high-energy-gamma-ray-bubble-around-a-microquasar/" onclick="window.open(this.href,this.title,'width=500,height=500,top=300px,left=300px'); return false;" rel="noopener noreferrer nofollow" target="_blank" class="icon button circle is-outline tooltip twitter" title="Share on Twitter" aria-label="Share on Twitter"><i class="icon-twitter" ></i></a><a href="mailto:enteryour@addresshere.com?subject=HAWC%20detection%20of%20an%20ultra-high-energy%20gamma-ray%20bubble%20around%20a%20microquasar&body=Check%20this%20out:%20https://wipac.wisc.edu/hawc-detection-of-an-ultra-high-energy-gamma-ray-bubble-around-a-microquasar/" rel="nofollow" class="icon button circle is-outline tooltip email" title="Email to a Friend" aria-label="Email to a Friend"><i class="icon-envelop" ></i></a><a href="https://pinterest.com/pin/create/button/?url=https://wipac.wisc.edu/hawc-detection-of-an-ultra-high-energy-gamma-ray-bubble-around-a-microquasar/&media=https://wipac.wisc.edu/wp-content/uploads/2024/10/microquasar_HAWC-1-778x800.jpeg&description=HAWC%20detection%20of%20an%20ultra-high-energy%20gamma-ray%20bubble%20around%20a%20microquasar" onclick="window.open(this.href,this.title,'width=500,height=500,top=300px,left=300px'); return false;" rel="noopener noreferrer nofollow" target="_blank" class="icon button circle is-outline tooltip pinterest" title="Pin on Pinterest" aria-label="Pin on Pinterest"><i class="icon-pinterest" ></i></a><a href="https://www.linkedin.com/shareArticle?mini=true&url=https://wipac.wisc.edu/hawc-detection-of-an-ultra-high-energy-gamma-ray-bubble-around-a-microquasar/&title=HAWC%20detection%20of%20an%20ultra-high-energy%20gamma-ray%20bubble%20around%20a%20microquasar" onclick="window.open(this.href,this.title,'width=500,height=500,top=300px,left=300px'); return false;" rel="noopener noreferrer nofollow" target="_blank" class="icon button circle is-outline tooltip linkedin" title="Share on LinkedIn" aria-label="Share on LinkedIn"><i class="icon-linkedin" ></i></a></div></div></div> <footer class="entry-meta text-left"> This entry was posted in <a href="https://wipac.wisc.edu/category/projects/hawc/" rel="category tag">HAWC</a>, <a href="https://wipac.wisc.edu/category/projects/wipac/" rel="category tag">WIPAC</a>. 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